Carel Hecu CO2 User Manual

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High e ciency condensing unit

OEM user manual

READ CAREFULLY IN THE TEXT!

Integrated Control Solutions & Energy Savings

NO POWER

& SIGNAL

CABLES

TOGETHER

ENG

WARNINGS

CAREL bases the development of its products on decades of experience in HVAC, on continuous investments in technological innovations to products, procedures and strict quality processes with in-circuit and functional testing on 100% of its products, and on the most innovative production technology available on the market. CAREL and its subsidiaries/aﬃ liates nonetheless cannot guarantee that all the aspects of the product and the software included with the product respond to the requirements of the ﬁ nal application, despite the product being developed according to start-of-the-art techniques. The customer (manufacturer, developer or installer of the ﬁ nal equipment) accepts all liability and risk relating to the conﬁ guration of the product in order to reach the expected results in relation to the speciﬁ c ﬁ nal installation and/or equipment. CAREL may, based on speciﬁ c agreements, acts as a consultant for the positive commissioning of the ﬁ nal unit/application, however in no case does it accept liability for the correct operation of the ﬁ nal equipment/system.

The CAREL product is a state-of-the-art product, whose operation is speciﬁ ed in the technical documentation supplied with the product or can be downloaded, even prior to purchase, from the website www.carel.com.

Each CAREL product, in relation to its advanced level of technology, requires setup/conﬁ guration/programming/commissioning to be able to operate in the best possible way for the speciﬁ c application. Failure to complete such operations, which are required/indicated in the user manual, may cause the ﬁ nal product to malfunction; CAREL accepts no liability in such cases. Only qualiﬁ ed personnel may install or carry out technical service on the product. The customer must only use the product in the manner described in the documentation relating to the product.

In addition to observing any further warnings described in this manual, the following warnings must be heeded for all CAREL products:

• prevent the electronic circuits from getting wet. Rain, humidity and all

types of liquids or condensate contain corrosive minerals that may damage the electronic circuits. In any case, the product should be used or stored in environments that comply with the temperature and humidity limits speciﬁ ed in the manual;

• do not install the device in particularly hot environments. Too high

temperatures may reduce the life of electronic devices, damage them and deform or melt the plastic parts. In any case, the product should be used or stored in environments that comply with the temperature and humidity limits speciﬁ ed in the manual;

• do not attempt to open the device in any way other than described in the

manual.

• do not drop, hit or shake the device, as the internal circuits and mechanisms

may be irreparably damaged;

• do not use corrosive chemicals, solvents or aggressive detergents to clean

the device.

• do not use the product for applications other than those speciﬁ ed in the

technical manual.

All of the above suggestions likewise apply to the controllers, serial cards, programming keys or any other accessory in the CAREL product portfolio. CAREL adopts a policy of continual development. Consequently, CAREL reserves the right to make changes and improvements to any product described in this document without prior warning. The technical speciﬁ cations shown in the manual may be changed without prior warning.

The liability of CAREL in relation to its products is speciﬁ ed in the CAREL general contract conditions, available on the website www.carel.com and/ or by speciﬁ c agreements with customers; speciﬁ cally, to the extent where allowed by applicable legislation, in no case will CAREL, its employees or subsidiaries/aﬃ liates be liable for any lost earnings or sales, losses of data and information, costs of replacement goods or services, damage to things or people, downtime or any direct, indirect, incidental, actual, punitive, exemplary, special or consequential damage of any kind whatsoever, whether contractual, extra-contractual or due to negligence, or any other liabilities deriving from the installation, use or impossibility to use the product, even if CAREL or its subsidiaries/aﬃ liates are warned of the possibility of such damage.

IMPORTANT

NO POWER

& SIGNAL

CABLES

READ CAREFULLY IN THE TEXT!

Separate as much as possible the probe and digital input cables from cables to inductive loads and power cables, so as to avoid possible electromagnetic disturbance. Never run power cables (including the electrical panel cables) and signal cables in the same conduits.

TOGETHER

DISPOSAL

INFORMATION FOR USERS ON THE CORRECT HANDLING OF WASTE ELECTRICAL AND ELECTRONIC EQUIPMENT (WEEE)

In reference to European Union directive 2002/96/EC issued on 27 January 2003 and related national legislation, please note that:

• WEEE cannot be disposed of as municipal waste and such waste must be

collected and disposed of separately;

• the public or private waste collection systems deﬁ ned by local legislation

must be used. In addition, the equipment can be returned to the distributor at the end of its working life when buying new equipment;

• the equipment may contain hazardous substances: the improper use or

incorrect disposal of such may have negative eﬀ ects on human health and on the environment;

• the symbol (crossed-out wheeled bin) shown on the product or on the

packaging and on the technical leaﬂ et indicates that the equipment has been introduced onto the market after 13 August 2005 and that it must be disposed of separately;

• in the event of illegal disposal of electrical and electronic waste, the

penalties are speciﬁ ed by local waste disposal legislation.

Warranty on materials: 2 years (from production date, excluding consumables).

Approval: the quality and safety of CAREL S.P.A. products are guaranteed by the ISO 9001 certiﬁ ed design and production system.

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

Content

1. INTRODUCTION 7

1.1 General features .............................................................................................. 7

1.2 Components and accessories ......................................................................7

2. INSTALLATION 8

2.1 Main board: description of the terminals .................................................. 8

2.2 10A single-phase inverter .............................................................................. 9

2.3 12-16 A single-phase, 18-24 A three-phase inverter .............................. 10

2.4 12 A single-phase inverter PSD2 ............................................................... 11

2.5 Unipolar E2V valves for R744 ..................................................................... 14

2.6 Pressure probes (SPKT00**8C0) ..............................................................14

2.7 Temperature probes .....................................................................................14

2.8 General connection diagram ...................................................................... 15

2.9 Functional diagrams ..................................................................................... 16

2.10 Installation ...................................................................................................... 18

3. USER INTERFACE 19

3.1 Graphic terminal ...........................................................................................19

3.2 Description on the display .......................................................................... 19

ENG

4. MENU DESCRIPTION 20

4.1 Main menu ..................................................................................................... 20

5. COMMISSIONING 21

5.1 Guided commissioning procedure ........................................................... 21

6. FUNCTIONS 22

6.1 Unit ON/OFF .................................................................................................. 22

6.2 BLDC compressor .........................................................................................22

6.3 Compressor control ......................................................................................25

6.4 Compressor management on LT units (DSS and independent) .......27

6.5 Fans ..................................................................................................................28

6.6 Oil management ...........................................................................................29

6.7 HPV valve management .............................................................................. 32

6.8 RPRV valve management ............................................................................ 33

6.9 Generic functions ..........................................................................................34

6.10 Default value management ........................................................................ 35

7. FAST COMMISSIONING 36

7.1 MPXPRO conﬁ guration (SW version t 4.0) ............................................ 36

7.2 Ultracell conﬁ guration (SW version t 2.0)..............................................38

7.3 Ultra EVD EVO module commissioning ..................................................43

7.4 Connecting MPXPRO/Ultracella controllers to Hecu ............................44

8. SIGNALS AND ALARMS 47

8.1 Alarm management ......................................................................................47

8.2 Compressor alarms ...................................................................................... 47

8.3 Pressure alarms .............................................................................................48

8.4 Anti liquid return MPX valve alarm .......................................................... 49

8.5 High pressure prevention ...........................................................................49

8.6 MPXPRO/UltraCella alarms .........................................................................49

8.7 Alarm table .....................................................................................................50

9. SOFTWARE UPDATE 58

9.1 Uploading/updating the software .............................................................58

9.2 Software revision history ............................................................................. 61

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

1. INTRODUCTION

ENG

1.1 General features

Hecu CO2 is a control system for complete management of R744 condensing units ﬁ tted with BLDC compressors. The serial connection between the condensing unit and the evaporators controlled by MPXPRO/UltraCella and CAREL EEV expansion valves represents one of the main features of this solution, contributing to the energy eﬃ ciency and reliability of the entire system. The control board is designed for DIN rail assembly and is ﬁ tted with plug-in screw terminals, as well as incorporating a driver for managing two electronic expansion valves. A user terminal (PGDe or pLDpro) is also available for service or commissioning the system.

Main features:

• Modulation of cooling capacity by BLDC compressor with inverter;

• Management of a ﬁ xed-speed backup compressor;

• Management of two modulating fans;

• Card with built-in driver for CAREL unipolar valves;

• Management of unipolar high-pressure valve (HPV);

• Management of unipolar ﬂ ash gas valve (RPRV );

• Serial communication with evaporators (max 5);

• RS485 serial for BMS;

• Floating suction pressure set point;

• Floating condensing pressure set point;

• Advanced algorithm for calibrated oil injection to the compressor;

• Oil speed boost for oil return to the compressor;

• Oil recovery washing for oil return to the compressor;

• Vast conﬁ guration of defrost functions;

• Suction and discharge superheat control;

• Ample conﬁ guration of alarms.

1.2 Components and accessories

Part number Description

A ECU70TS0C0 Hecu CO2 controller, 230Vac, RTC, 2 unipolar EEV,

A ECU70TS0D0 Hecu CO2 controller, 230Vac, RTC, 2 unipolar EEV,

A ECU80TS0C0 Hecu CO2 controller, 24Vac, RTC, 2 unipolar eev,

A ECU80TS0D0 Hecu CO2 controller, 24Vac, RTC, 2 unipolar EEV,

A PSD101021A Power+ 10 A, 200-240 Vac 1Ph, IP00 A PSD1012200 Power+ 12 A, 200240 Vac 1Ph, IP20/IP44 A PSD1016200 Power+ 16 A, 200240 Vac 1Ph, IP20/IP44 A PSD1018400 Power+ 18 A, 280480 Vac 3Ph, IP20/IP44

PS20012204110 POWER+ 12 A, 200-240 Vac 1PH, IP20 PEC

PS20015204110 POWER+ 15 A, 200-240 Vac 1PH, IP20/IP44 PEC

PS20018404110 POWER+ 18 A, 380-480 Vac 3PH, IP20/IP44 PEC

PS20012204100 POWER+ 12 A, 200-240 Vac 1PH, IP20

PS20015204100 POWER+ 15 A, 200-240 Vac 1PH, IP20/IP44

PS20018404100 POWER+ 18 A, 380-480 Vac 3PH, IP20/IP44

PSACH10100 Coil for POWER+ 18 A

A M E2V**CS1C0 Electronic expansion valve E2V**C 1313 S.

M E2VSTA03*0 Unipolar stator coil with cable *m M E2VFIL0100 Filter kit for valve E2VBSF (conn. diam. 12 ODF) 10 pcs M SPKT00H8C0 Press.Trasd. 4-20 mA 0...120 barg (0...1740 psig) sealed gage

M SPKT00D8C0 Press.Trasd. 4-20 mA 0...150 barg (0…2175 psig) sealed gage

A SPKT00L1S0 Press.Trasd. 0-5V 0…90 barg sealed gage packard 1/4 gas F M SPKC002310 Cable AWG 3 wires l=2m for SPKT packard vulcanised - IP67 M NTC0**HT41 IP55, ** m cable, 0T150 °c, multiple package (10 pcs) M NTC0**HF01 IP67, ** m cable, fast reading NTC probe strap-on plastic O NTC0**WH01 Wh NTC sensor IP68 -50T105 cable **m A PGDEH31FX0 pGDe terminal Hecu LOGO, pLAN version A PLD00GFP00 PLDPro LCD neutral, 132x64 pixels, pLAN version M S90CONN00* Connection cable between terminal and pCO O PCOS004850 Opto-isolated RS485 serial connection card for pCO sistema O PCOS00S030 Fastening bracket for RS485/Lon/RS232 serial card

Key:

M mandatory

(mandatory)

connector kit, no BMS, FLSMTDMCUTU

connector kit, no BMS, with plastic cover, FLSMTDMCUTU

connector kit, no BMS, FLSMTDMCUTU

connector kit, no BMS, with plastic cover, FLSMTDMCUTU

Steel high pressure without electrical coil

8-28V packard 1/4 gas male

, l=*m

Tab. 1.a

A mandatory /

alternative

O optional

Hecu CO2 system example

Supervisor

RS485 max 5 unit

Fig. 1.a

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

2. INSTALLATION

2.1 Main board: description of the terminals

For further details on the electrical and mechanical speciﬁ cations, see technical leaﬂ et +050001590

Vout RX-/TX-

J10

J15

J16

J17

J18

J19

J20

J21

J22

J23

J24

J11

J12

J14

RX+/TX+ GND

RX-/TXRX+/TX+ GND

N01

NC1

Out2 C2

Out3 C2

Out4 C2

Out5 C2

C2 V-IN

Out6 C6

Out7 C7

Out8 C8

- for UP2B*: 24 Vac +10%/-15% 50/60 Hz,

28 to 36 Vdc +10%/-15%;

U1 U2

GND

U4 U5

+Vdc

+5VR

GND

U6 U7

+Vdc

+5VR

GND

U8 U9

U10

+Vdc +5VR

GND

Y2 Y3

DI1 DI2

DI3 DI4

GND

J13

- for UP2A*: 230 Vac 50/60 Hz, +10%/-15%;

Fig. 2.a

Key:

1 Power 230 Vac for version with transformer (UP2A*********)

Power 24 Vac for version without transformer (UP2B*********) 2 Universal channels 9 Alarm digital output 3 Analogue outputs 10 pLAN serial connection 4 Digital inputs 11 BMS2 serial connection 5a Valve 1 output 12 Fieldbus serial connection 5b Valve 2 output 13 Connection for PLD terminal 6 Switching digital relay outputs 14 Dipswitch for settings 7 Voltage input for outputs 2, 3, 4, 5 15 BMS1 RS485 serial card 8 Digital outputs with voltage signal 16 Green power LED

Digital inputs Analogue outputs

Type: digital inputs with voltage-free contacts Number of digital inputs (DI): 4 Type: 0 to 10 Vdc cont., PWM 0 to 10 V 50 Hz synch. with power supply, PWM 0 to 10 V frequency 100 Hz, PWM 0 to 10 V frequency 2 kHz Number of analogue outputs (Y): 3

Universal channels

Analogue/digital conversion bits: 14 Type of input selectable from application: NTC, PT1000, PT500, PT100, 4 to 20 mA, 0 to 1 V, 0 to 5 V, 0 to 10 V, voltage-free contact ** Type of output selectable from application: PWM 0/3.3 V 100 Hz synchronous with power supply PWM 0/3.3 V 100 Hz, PWM 0/3.3 V 2 kHz, 0 to 10 V analogue output Maximum current 2 mA Number of universal channels (U): 10 Precision of passive probe reading: ± 0.5 C across entire temperature range; Precision of active probe reading: ± 0.3% across entire voltage range; Output precision: ± 2%

Digital outputs

Group 1, Switchable power R1: NO 1(1)A Group 2, Switchable power R3, R4, R5: NO NO 2(2)A Group 3, Switchable power R6, R7, R8: NO 6(6)A Maximum switchable voltage: 250Vac Switchable power R2 (SSR case mounting): 15 VA 110/230 Vac The relays in the same group have basic insulation between each other and therefore must have the same power supply Relays belonging to diﬀ erent groups have reinforced insulation and consequently a diﬀ erent power supply can be used

Unipolar valve outputs

Maximum power for each valve: 7 W Type of control: unipolar Valve connector: 6-pin, ﬁ xed sequence Power supply: 12 Vdc ±5% Maximum current: 0.3 A for each winding Minimum winding resistance: 40 Ω Maximum cable length: 2 m

** max. 6 x 0 to 5 V rat. and 4 x 4 to 20 mA probes

Tab. 2.a

Electrical and mechanical speci cations of the controller

Power supply:

230 Vac, +10…-15% UP2A*********; 24 Vac +10%/-15% 50/60 Hz, 28 to 36 Vdc +10…-15% UP2B*********; Maximum power input: 25 VA Insulation between power supply and controller

• 230 Vac model: reinforced

• 24 Vac model: reinforced guaranteed by power transformer Maximum voltage of connectors J1 and J16 to J24: 250 Vac; Minimum size of digital output wires: 1.5 mm Minimum size of all other connector wires: 0.5 mm

Power supplied

Type: +Vdc, +5VR, Vout for external power supplies +Vdc: 26 Vdc ±15% for 230 Vac model power supply (UP2A*********),

21 Vdc ±5% for 24 Vac model power supply (UP2B*********) Max current available +Vdc: 150 mA total, taken from all connectors, protected against short circuits

+5 VR: 5 Vdc ± 2%; maximum available current 60 mA, total taken from all connectors, protected against short circuits

Vout: 26 Vdc ±15% for 230 Vac model power supply (UP2A*********), 21 Vdc ± 5% Maximum current available (J9): 100 mA

Product speci cations

Program memory (FLASH): 7 MB Log memory: 4 MB Internal clock precision: 100 ppm Removable battery: Lithium button, CR2430, 3 Vdc Battery lifetime: minimum 8 years

Terminal connections available

Type: all pGDe terminals with dedicated connector J15, PLD with dedicated connector J10

Max distance for pGDe terminal: 2 m via telephone connector J15, 50 m via AWG24 shielded cable

Maximum number of connectable terminals: one pGDe series terminal on J15 or J14; one PLD terminal on connector J10, selecting the tLAN protocol on card dipswitches

Communication lines available

Type: RS485, Master for FieldBus1, Slave for BMS 2, pLAN No. and type of lines available:

1 line, not opto-isolated on connector J11 (BMS2). 1 line, not opto-isolated on connector J9 (FieldBus), if not used by the PLD terminal on connector J10. 1 line, not opto-isolated on connector J14 (pLAN), if not used by the pGDe terminal on connector J15. 1 optional line (J13), selectable from the Carel options available

Max. connection cable length: 2 m via unshielded cable, 500 m via AWG24 shielded cable

Maximum connection length

Universal digital inputs and anything else not speciﬁ ed: less than 10 m Digital outputs: less than 30 m Serial lines: see speciﬁ cations in the corresponding sections

Operating conditions

Storage: -40T70 °C, 90% rH non-cond. Operation: -40T70 °C, 90% rH non-cond.

Physical speci cations

Dimensions: 13 DIN rail modules, 228 x 113 x 55 mm Ball pressure test: 125 °C

Other speci cations

Environmental pollution: level 2 Ingress protection: IP00 Class according to protection against electric shock: to be incorporated

into Class I and/or II equipment PTI250 for PCB insulation; PTI175 for other materials Period of stress across the insulating parts: long Type of action: 1C; 1Y for SSR versions Type of disconnection or microswitching: microswitching Heat and ﬁ re resistance category: category D (UL94 - V2) Immunity against overvoltages: category II Software class and structure: Class A Do not touch or tamper with the device when powered

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

2.2 10A single-phase inverter

For further details on the electrical and mechanical speciﬁ cations, see technical leaﬂ et +0500076IE

-DC +DC

Fig. 2.b

Description of the terminals:

Ref. Description

L, N

earth conn. (*)

U, V, W

earth conn. (*)

-DC +DC J1-1 C J1-2 NO J2-3 0 V

J2-5 Tx/RxJ3-6 PTC J3-7 24 Vdc

F (LED)

(*) The earth connections inside the controller are electrically connected together and to the PE.

Single-phase power input

Motor output

DC bus output

Relay output (green connector)

RS485/ModBus® connectionJ2-4 Tx/Rx+

PTC input (black connector)

PE POWER (green) drive powered RUN/FAULT (green/red) drive running / active alarm DATA (yellow) communication active

2 3 4 5 6 7

PTC

24Vdc

Tab. 2.b

CE conformity: 2006/95/EC

EN 61800-5-1: Adjustable speed electrical power drive systems. Safety requirements. Electrical, thermal and energy.

2004/108/EC

EN 61800-3, ed. 2.0: Adjustable speed electrical power drive systems. EMC requirements, including speciﬁ c test methods. EN61000-3-2: Electromagnetic compatibility (EMC) Part 3-2: Limits for harmonic current emissions (equipment input current <= 16A per phase). EN61000-3-12: Electromagnetic comp. (EMC) Part 3-12: Limits - Limits for harmonic current emissions (equipment input current > 16 A and <=75 A per phase).

Rated values

The following table shows the rated input current and output current values, as well as the speciﬁ cations for sizing the cables (cross-section, maximum length) and the fuses. The values refer to an operating temperature of 60°C and a switching frequency of 8 kHz, unless otherwise speciﬁ ed.

PSD10102BA

Rated input current at 230 V Fuse or type B circuit breaker Power cable size Rated output current Rated output power at 230 V Maximum total dissipation Maximum dissipation on the heat sink Min. motor cable size Max. motor cable length

17 A 25 A 4 mm 10 A

3.8 kW 270 W 150 W

2.5 mm 5 m

Tab. 2.d

Dimensions

6 87,1

4,8

Important: before carrying out any maintenance, disconnect the drive and the control circuits from the power supply by moving the main system switch to “oﬀ ”. Once having powered down the drive, wait at least 5 minutes before disconnecting the electrical cables;

Main technical speci cations

Operating temperature -20T60°C Humidity < 95% RH non-condensing Environmental pollution level Max 2

Input voltage 200 - 240V ± 10%, 50 - 60Hz, 1~ Output voltage 0 - Input voltage Output frequency 0 - 500 Hz Maximum length 5 m Switching frequency 4, 6, 8 kHz

Protection functions

Frequency resolution 0.1 Hz

Inputs

Outputs

Serial input

24 Vdc auxiliary power supply Double insulation, 10% precision, 50 mA max Maximum length 100 m shielded cable Ingress protection IP00

Drive: short circuit, overcurrent, earth fault, overvoltage and undervoltage, overtemperature

Motor: overtemperature and overload (150% Inom for 1 minute)

System: loss of communication

1 motor protection input: PTC temp. or voltage-free contact, maximum current 10 mA, maximum length 25 m.

1 relay: programmable output, voltage-free contact: 240 Vac, 1 A

RS485, Modbus® protocol, max baud rate 19200 bit/s

Tab. 2.c

177,6 40,9

197

Fig. 2.c

4,8

65,7 7,3 7,5

102,8 39,3

138

Ø5

113,412,6 4

7055,8

6,9

209,5

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

2.3 12-16 A single-phase, 18-24 A threephase inverter

For further details on the electrical and mechanical speciﬁ cations, see technical leaﬂ et +0500048IE

C1 C2

L1/LL2/N L3UVW

Fig. 2.d

Description of the terminals:

Ref. Description

L1/L, L2/N, L3

earth conn. (*)

L1/L, L2/N

earth conn. (*)

U, V, W

earth conn. (*)

C1, C2

1.2 Relay output 30 V

5 Tx/Rx6 PTC input 7 24 Vdc 80V 9 STOa Safety digital input - Safe Torque 10 STOb

F (LED)

(*) The earth connections inside the controller are electrically connected together and to the PE. (**) To enable the drive to operate, apply a voltage of 24 Vac/Vdc to the Safe Torque Oﬀ digital input. The polarity is indiﬀ erent for direct current power supply.

Three-phase power input

Single-phase power input

Motor output

Terminals not used in PSD10**2 **, for optional DC choke on PSD10184** and PSD10244**

PE POWER (green) drive powered RUN/FAULT (green/red) drive running / active alarm DATA (yellow) communication active

1 2 345 678910

RS485/ModBus® connection4 Tx/Rx+

Auxiliary voltage

Oﬀ (**)

CE conformity:

2006/95/EC EN 61800-5-1: Adjustable speed electrical power drive systems. Safety requirements. Electrical, thermal and energy. 2004/108/EC EN 61800-3, ed. 2.0: Adjustable speed electrical power drive systems. EMC requirements, including speciﬁ c test methods. EN61000-3-2: Electromagnetic compatibility (EMC) Part 3-2: Limits for harmonic current emissions (equipment input current <= 16A per phase). EN61000-3-12: Electromagnetic comp. (EMC) Part 3-12: Limits - Limits for harmonic current emissions (equipment input current > 16A and <=75A per phase).

Rated values

model

PSD10122A0 PSD10162A0

22 A 28 A 32 A 40 A

4 mm

6 mm

12 A 16A

4.5 kW 6 kW 330 W 450 W 190 W 250 W

2.5 mm

5 m 5 m

Tab. 2.f

model

Rated input current at 400 V 3PH Fuse or type B circuit breaker Power cable size Rated output current Rated output power at 400 V 3PH Maximum total dissipation Maximum dissipation on the heat sink Min. motor cable size Max. motor cable length

18A 3PH 24A 3PH

23 A 30 A 32 A 40 A

4 mm

6 mm

18A 24A

10.5 kW 14 kW 320 W 485 W 250 W 380 W 4 mm

4 mm

5 m 5 m

Tab. 2.g

Dimensions

173

127

Main technical speci cations

Reference technical document Operating temperature -20T60°C

Humidity < 95% RH non-condensing Environmental pollution level Max 2 Input voltage 200 - 240V ± 10%, 50 - 60Hz, 1~ Output voltage 0 - Input voltage Output frequency 0 - 500 Hz Maximum length 5 m Switching frequency 4, 6, 8 kHz

Protection functions

Frequency resolution 0.1 Hz

Inputs

Outputs

Serial input

24 Vdc aux. power supply Double insulation, 10% precision, 50 mA max Maximum length 100 m shielded cable Ingress protection IP20

+0500048IE

Drive: short circuit, overcurrent, earth fault, overvoltage and undervoltage, overtemperature

Motore: overtemperature and overload (150% Inom for 1 minute)

System: Safe Torque OFF input, loss of communication

1 motor protection input: PTC temp. or voltage-free contact, maximum current 10 mA, maximum length 25 m.

1 relay: programmable output, voltage-free contact: 240 Vac, 1 A

RS485, Modbus® protocol, max baud rate 19200 bit/s

Tab. 2.e

268

240

24,6

27,9

2660

70,8

33,2

71,3

Fig. 2.e

26 2675

192,3

131

190

289,2

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

2.4 12 A single-phase inverter PSD2

For further details on the electrical and mechanical speciﬁ cations, see technical leaﬂ et +0500120IE

cut this area and access to DIP switches to set the ID (network) address

Fig. 2.f

Description of the terminals:

Ref. Description

L, N Single-phase power input

(*)

PE U, V, W Motor output

(*)

-DC DC bus output +DC

GND (0V) Tx/Rx+ Tx/RxSTO1 STO safety input STO2

F (LED)

(*)

The earth connections inside the drive are wired together and to the PE.

Spade connectors

RS485/ModBus® connection 3-pin plug-in terminals

2-pin plug-in terminals

Earth screw

PE POWER (green) drive powered RUN (green) drive running

FAULT (red) drive alarm DATA (yellow) communication active

3 4 5 6 7

STO

A B

Tab. 2.h

Important:

• before carrying out any maintenance, disconnect the drive and the

control circuits from the power supply by moving the main system switch to “oﬀ ”. Once having powered down the drive, wait at least 5 minutes before disconnecting the electrical cables;

• always make sure that the motor has come to a complete stop. Freely

rotating motors may generate dangerous voltages across the Power+ terminals, even when this is not powered;

Rated values

PSD10102BA

Rated input current at 230 V 19.2 to

Fuse or type B circuit breaker Power cable size Rated output current Rated output power at 230 V Maximum total dissipation Maximum dissipation on the heat sink Min. motor cable size Max. motor cable length

16 A 25 A 4 mm 12 A

3.8 kW 270 W 150 W

2.5 mm 5 m

Tab. 2.i

Dimensions

103 39.3

Main technical speci cations

Environmental conditions

Power supply Motor output

Functions

Control unit

Inputs

Outputs DCbus power supply

Storage temperature -40T60°C Operating temperature -20T60°C Humidity < 95% RH non-condensing

Altitude

Environmental pollution level 3 Input voltage 200 - 240V / 105 -125V ± 10%, 50/60Hz, 1~ Output voltage 0 - Input voltage Output frequency 0 - 500 Hz Frequency resolution 0.1 Hz Maximum cable length see paragraph 5.1 Switching frequency 4, 6, 8 kHz

Protection functions

Each drive must be connected in the network via Modbus® to a CAREL pCO or other manufacturer’s controller that manages the drives with Master/ Slave logic.

STO (Safe Torque Oﬀ )

for auxiliary devices

40.9177.7

87.1

197

220

113.4

148

Fig. 2.g

Maximum allowed: 2000 m above sea level Up to 1000 m asl without derating Derating in terms of maximum output current: 1% /100m

Drive: short circuit, overcurrent, earth fault, overvoltage and undervoltage, overtemperature Motor: overload (150% Inom for 1 minute), stall System: loss of communication,

Safety: STO (Safe Torque Oﬀ ), locked rotor

Voltage-free contact input, reinforced insulation (12 V SELV circuit): open contact voltage: <24 V closed contact current: 40 mA typical max. cable length 25 m 395 Vdc ± 10 Vdc, 1.9 A max for PS2**122***** models; max. cable length 1 m - shielded cable, minimum cross-section 1 mm

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

Interface data connection

Serial data connection

Insulation Reinforced (24 V SELV circuit)

RS485, Modbus® protocol, maximum baud rate 19200 bit/s - typical resistance in reception 96 KΩ (equal to 1/8 load unit, i.e. 1/256 of the maximum load applicable on the line)

Maximum length 100 m shielded cable Ingress protection IP00 Ball pressure test temperature 125°C Construction Device to be incorporated Type of automatic action PS200122***0* and PS200122***S* Functional

PS200122***1* and PS200122***P* Safety

Pulse voltage 4 kV (overvoltage category III)

Conformity to standards

Low voltage directive

Compatibility directive electromagnetic

2014/35/EU IEC 60730-1, IEC 60335-1 (sections 29 and 30), IEC 60335-2-34 (sections 19.101 and 19.103)

2014/30/EU EN 61800-3, ed.2.0: Adjustable speed electrical power drive systems. EMC requirements, including speciﬁ c test methods. EN61000-3-2: Electromagnetic compatibility (EMC) Part 3-2: Limits - Limits for harmonic current emissions (equipment input current <= 16 A per phase). EN61000-3-12: Electromagnetic compatibility (EMC) Part 3-12: Limits - Limits for harmonic current emissions (equipment input current > 16 A and <=75 A per phase).

UL UL 60730-1, UL 60335-1 (sections 29 and 30), UL 60335-2-34 (sections 19.101 and 19.103)

2.1 15 A 1 PH and 18 A 3 PH inverter PSD2

For further details on the electrical and mechanical speciﬁ cations, see technical leaﬂ et +0500125IE

UVW

GND

Tx/Rx

Fig. 2.h

Description of the terminals:

Ref. Description

L3, L2, L1 Three-phase power supply

(*)

U, V, W C1 Optional external choke

C2 GND GND (0 V ) RS485/ModBus® connection

+ Tx/Rx+

- Tx/RxA STO safety digital input (**) B

E F (LEDS) POWER (green) drive powered

Motor output

three-pin plug-in connector

2-pin plug-in connector

earth screw

RUN (green) drive running FAULT (red) drive alarm DATA (yellow) communication active

(*) The earth connections inside the controller are wired together and to the PE. (**) Voltage-free digital input: if not used, short-circuit with a jumper.

Note: RS485 and STO connections have reinforced insulation from the power supply.

power

run-fault

data

STO

A B

Tab. 2.k

Tab. 2.j

• for a ﬁ xed installation, according to local regulations in force, a circuit

breaker may be required between the power supply and the drive;

• the drive must be connected to earth: the earth cable must be sized

for the maximum fault current, which will normally be limited by fuses or a circuit breaker.

Rated values

model 15A 1PH 18A 3PH

Rated input current at 230 V (400 V 3 PH)

Fuse or type B circuit breaker Power cable size Rated output current Rated output power at 230 V (400 V 3 PH) Maximum total dissipation Maximum dissipation on the heat sink Min. motor cable size Max. motor cable length

26 to 23 A

32 A 32 A

4 mm

15 A 18 A

5 kW 10.5 kW 320 W 320 W 235 W 250 W 4 mm

5 m 5 m

18.5 to

16.5 A

4 mm

Dimensions (mm)

8782

131 136

269.2

240 24.6

289,2

316

Important:

• in the European Union, all units that incorporate the drive must

comply with the Machinery Directive 2006/42/EC. Speciﬁ cally, the manufacturer of the unit is responsible for installing a main switch and conformity to standard EN 60204-1;

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

24.6

Fig. 2.i

172

192,3

213

Main technical speci cations

~ ~

Environmental conditions Storage temperature -40T60°C

Power supply

Motor output

Functions

Control unit

Inputs

Interface connection data

Other

Standards compliance

Operating temperature -20T60°C Humidity < 95% RH non-condensing

Altitude

Environmental pollution level 3

Input voltage

Output voltage 0 - Input voltage Output frequency 0 - 500 Hz Frequency resolution 0.1 Hz Maximum cable length see paragraph 5.1 Switching frequency 4, 6, 8 kHz

Protection functions

Each drive must be connected in the network via Modbus® to a CAREL pCO or other manufacturer’s controller that manages the drives with Master/Slave logic.

STO (Safe Torque Oﬀ )

Serial data connection

Insulation Reinforced (24 V SELV circuit) Maximum length 100 m shielded cable Ingress protection IP00 Ball pressure test temperature 125°C Construction Device to be incorporated Type of automatic action PS2********0* and PS2********S* models: Type 1 (functional control)

Pulse voltage 4 kV (overvoltage category III)

Low voltage directive

Electromagnetic compatibility directive

Maximum allowed: 2000 m above sea level Up to 1000 m asl without derating Derating in terms of maximum output current: 1% /100m

PS2**183*****, PS2**243*****: 200 - 240Vac -10%/ +10%, 50 - 60Hz, 3 ~ PS2**184*****, PS2**244*****: 380 - 480Vac -10%/ +10%, 50 - 60Hz, 3 ~

Drive: short circuit, overcurrent, earth fault, overvoltage and undervoltage, overtemperature Motor: overload (150% Inom for 1 minute), stall System: loss of communication,

Safety: STO (Safe Torque Oﬀ ), locked rotor

Voltage-free contact input, reinforced insulation (24 V SELV circuit): open contact voltage: <24 V closed contact current: 40 mA typical max. cable length 25 m RS485, Modbus® protocol, maximum baud rate 19200 bit/s Typical reception resistance 96 KΩ, equal to 1/8 of unit load, i.e. 1/256 of maximum load applicable on the line

PS2********1* and PS2********P* models: Type 2 (safety control)

2014/35/EU IEC 60730-1, IEC 60335-1 (sections 29 and 30), IEC 60335-2-34 (sections 19.101 and 19.103)

ENG

UL 60730-1, UL 60335-1 (sections 29 and 30), UL 60335-2-34 (sections 19.101 and 19.103). See chap. "UL requirements for installation".

Network address

The conﬁ guration and programming of the Power+ drive, as well as the run/stop commands and speed reference, are managed by a CAREL pCO controller or by any BMS (Building Management System) via RS485 serial connection with Modbus® protocol. The ModBus® network address can be set from 1 to 246, and this number comprises the basic address set by parameter, and the address set by the 4 dipswitches inside the drive, from 0 to 15. By changing the basic address, it is possible to cover the entire range of addresses.

Mod. add. Description Def Min Max UOM R/W

32 Basic address 1 1 232 - R/W 120 Network address - 1 246 - R 121 Dipswitch address - 0 15 - R

Tab. 2.m

Important:

any changes to the device’s serial address, either on the dipswitches or via the parameter, will only be eﬀ ective when next powering on or resetting the device.

The conﬁ guration of the address set manually by the dipswitches on the drive is shown below.

Tab. 2.l

Important: Before accessing the dipswitches, power oﬀ and wait for

the LEDs to go oﬀ .

Dipswitch address

Dipswitches

1234

OFF OFF OFF OFF 0

ON OFF OFF OFF 1

OFF ON OFF OFF 2

………… …

ON ON ON ON 15

Dipswitch

address

Tab. 2.n

Warning: if the address set by the dipswitches is between 0 and 14, the network address is the sum of the basic address and the dipswitch address, while baud rate and parity are set by the corresponding parameters.

If the dipswitch address is set to 15, communication mode is set to:

• 19200 bit/s; no parity; 2 stop bits; network address 1

regardless of the value of the corresponding parameters. It is recommended to avoid setting the dipswitch address to 15 as a normal conﬁ guration.

234

Fig. 2.j

OFF

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

2.5 Unipolar E2V valves for R744

44.0

43.0

ØE In ØE Out

ØF In

ØF Out

(in 0.51 out 0.71 inch)

ID 13/OD 18 mm

(in 0.51 out 0.71 inch)

10 mm (0.39 inch)

Ø39

Ø16

Valve type A B C D E F G E2V**CS1C* 125.8mm (4.95 inch) 82.3 mm (3.24inch) 52.3 mm (2.06 inch) 53.3 mm (2.10 inch) ID 13/OD 18 mm

CAREL E2V-C operating speci cations CAREL E2V-U stator

Compatibility R22, R134a, R404A, R407C,R410A, R744, R507A, R417A Reference technical document +050001440 Maximum working

up to 140 barg (2030 PSIg) Power supply voltage 12 V pressure (MWP) Maximum operating pressure diﬀ erential

up to 120 bars (1740 PSI)

for E2V24CS0** and E2V24CS1** 85 bars (1233 PSI)

Drive frequency 50 Hz

(MOPD) PED Gr. 2, art. 3, par. 3 Phase resistance (25 °C) 40 Ohms ± 10% Refrigerant temperature -40T70 °C (-40T158 °F) Ingress protection IP67 Room temperature -30T70 °C (-22T158 °F) Connections 6 pin, cable length: 2 m Contact CAREL for diﬀ erent operating conditions or alternative refrigerants. Complete closing / control steps 500 / 480

2.6 Pressure probes (SPKT00**8C0)

uscita

out

non utilizzato

not used

Technical speci cations

reference technical document +050000596 power supply 8-28 Vdc, ±20% output 4 to 20 mA mechanical ﬁ tting ¼” male gas (with circular gasket, resistant to

water and oil) operating temp. -40T100°C storage temp. -20T100°C ﬂ uid temp. (average) -20T100°C linearity ± 1% FS (0 to 50 °C) temperature compensated

± 2% FS (0 to 80 °C); ± 4% FS (-40 to 100 ° C) ingress protection IP67 with connector plugged in

Fig. 2.a

alimentazione

supply

shock 20 g* sinusoidal, 11 msec vibrations 5 to 2000 Hz / 10 g /, X/Y/Z axes / 20 g sen 11

Description of codes and models

Part number Pressure psi Pressure bars Mod. over

SPKT00D8C0 0 2175 0 150 Male 4360 300 7680 530 IP67 SPKT00H8C0 0 1740 0 120 Male 4360 300 7680 530 IP67

Note: (1): with connector plugged in; all sensors are sealed gauge

4 mA 20 mA 4 mA 20 mA psi bar psi bar

range

Burst pressure

(1)

environmental poll. level normal insulation at 50 V ≥ 10 MΩ response time (0 to 99%) < 10 msec EMC EN 61000-6-1 - 4 / EN 61326-2-3 electrical connections Packard Plug tightening force 12-16 Nm Compatible with all types of refrigerant

Note: FS = MAX output - MIN output

Tab. 2.o

2.7 Temperature probes

Models NTC***HP00 NTC***HT41 NTC***HF01

Reference technical document +030220655 +030220655 +030220655 Operating range -50T105 °C in air / -50T50 °C in ﬂ uid 0T150 °C in air -50T105 °C Connections Stripped wire terminals, dimensions: 5±1

mm Sensor NTC 10 kΩ ±1% at 25 °C Beta 3435 NTC 50 kΩ ±1% at 25 °C Beta 3977 R(25 °C)= 10 kOhm 1%; Beta 3435 Dissipation factor (in air) approx. 3 mW/°C approx. 3 mW 3 mW Thermal constant over time (in air) approx. 25 s approx. 30 s approx. 50 s Sensor ingress protection IP67 IP55 IP67 Sensor housing Polyoleﬁ n High temperature polyester dim. 20x5 mm Thermoplastic with ﬁ xing tie Class of protection against electric shock Basic insulation for 250 Vac Basic insulation for 250 Vac Basic insulation for 250 Vac Heat and ﬁ re resistance cat. Flame retardant In accordance with CEI 20-35 UL/HB cable

• inside showcase temperature • discharge temperature

Tab. 2.p

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

Stripped wire terminals, dimensions: 6±1mm

• evaporation temperature

• gas cooler outlet temperature

2.8 General connection diagram

ENG

Inverter 15A (1 PH) Inverter 12/16A (PSD1)

L2/N L3 U V W

L1/L

LKN

(*)

White

Green Green

Black

(*)

Black

White Green

(*)

White

(*)

Black Black

Green

HP switch

Fuse or

MCB

PAY ATTENTION TO THE POWER SUPPLY!

Power supply

- for ECU70*: 230 Vac 50/60 Hz, +10%/-15%;

- for ECU80*: 24 Vac +10%/-15% 50/60 Hz, 28 to 36 Vdc +10%/-15%;

Analog Input

Suction press. probe

Gas cooler press. probe

Suction temp. probe (CAREL NTC)

Discharge temp. probe (CAREL NTC-HT)

Gas cooler temp. probe (CAREL NTC)

Discharge only LT probe

Parallel suct. probe (LT)

B10

Receiver probe (MT)

0...10 Vdc Fan

Analog Output (0-10V)

Digital Input (free voltage)

Inverter 18/24A (3 PH)

Inverter 12A Inverter 10A (PSD1)

-DC

+DC

to power+, MPXPRO, Ultracella

pGDe Terminal pLD PRO

GND STO

345 67

HPV valve

Digital Output

(POWERED)

Digital Output

(NOT POWERED)

PTC

Klixon

boss

J13

High press

switch

J10

J11

J12

J14

J16

J17

J18

J19

J20

J21

J22

J23

J24

OFF

GND STO

to HECU controller

U1 U2 U3

GND

U5 +Vdc +5VR

GND

U7 +Vdc +5VR

GND

U10 +Vdc +5VR

GND

GND (A01) Y1 (A02) Y2 (A03) Y3

DI1 DI2 DI3 DI4

GND

PTC Klixon

HECU conguration

supervisory system

DIP2=OFF

DIP1=ON

RS485 serial card

to connect

RPRV valve

L N

UVW

Fuse or

MCB

Vout RX-/TXRX+/TX+ GND RX-/TXRX+/TX+ GND

RX-/TXRX+/TX+ GND

N01

Fan 1

NC1

Out2 C2

Out3 C2

Out4 C2

Out5 C2

C2 V-IN

N06 C6

N07 C7

N08 C8

Fig. 2.k

(*) The 4-20 mA pressure probes must be connected with the white to Ux and the black to + Vdc, green is not used (**) 230 Vac SSR output, maximum switchable power 15 VA

Important: If the PEC version inverters (with class B software structure) are not used, the thermal protection devices for overload and high pressure must act directly on the compressor actuator, and must therefore be wired in series with the compressor contactor coil control. For the types of cable to be used, see the power+ manual ( +0300094EN).

I/O selection tables (example for MT unit)

Analogue inputs Digital inputs Analogue outputs Digital outputs

Suction temperature High pressure alarm Modulating fans Fan 1 Discharge temperature Low pressure alarm Fan 2 Outside temperature BLDC compressor alarm Equalising solenoid valve Gas cooler outlet temperature Fan alarm Suction pressure Remote ON-OFF Gas cooler pressure Receiver pressure

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

2.9 Functional diagrams

There are two conﬁ gurations, one for medium temperature applications and one for low temperature applications. The main diﬀ erence involves the double suction line required for low temperature applications; in this case, the RPRV (ﬂ ash gas) valve is optional. There are other alternative conﬁ gurations that require a system to inject oil via an EEV (using an external driver) or capillary tube.

1. Medium temperature con guration

The conﬁ guration deﬁ ned for medium temperature applications involves Hecu CO2 managing a DC compressor, with up to 2 on-oﬀ fans, an electronic expansion valve for gas cooler pressure control (HPV) and an electronic expansion valve for managing receiver pressure (RPRV). The serial network allows monitoring and interaction with up to 5 evaporators equipped with MPXPRO or UltraCella controllers, and a CAREL EEV electronic expansion valve.

HPV

OUT, GT

REC

Technology

Check

valve

DIS

RPRV

35 barg

By-pass

SUC

up to 5

2. Low temperature con guration

The conﬁ guration deﬁ ned for low temperature applications involves Hecu CO2 managing two DC compressors (LT/DC and parallel), with up to 2 on-oﬀ fans, an electronic expansion valve for gas cooler pressure control (HPV) and an optional electronic expansion valve for managing receiver pressure (RPRV). It should be noted that in this conﬁ guration, the RPRV (ﬂ ash gas) valve is optional, as receiver pressure control is managed by the parallel compressor. The serial network allows monitoring and interaction with up to 5 evaporators equipped with MPXPRO or UltraCella controllers, and a CAREL EEV electronic expansion valve.

HPV

OUT, GT

Technology

Check

valve

DIS

By-pass

L1: PAR

SUC

Technology

SUC

Check valve

DIS

35 barg

By-pass

REC

L2: LT

SUC

Fig. 2.l

Symbol Description

TSUC Suction temperature PSUC Suction pressure TDIS Discharge temperature Tout,GC Gas cooler temperature PGC Gas cooler pressure PREC Receiver pressure

up to 5

Fig. 2.m

Symbol Description

TS,LT Suction temperature LT PS,LT Suction pressure LT TD,LT Discharge temperature LT PD,LT Discharge pressure LT TS,PAR Suction temperature PAR PS,PAR Suction pressure PAR TD,PAR Discharge temperature PAR Tout,GC Gas cooler temperature PGC Gas cooler pressure PREC Receiver pressure

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

3. Serial network con guration

Hecu CO2 is ﬁ tted with a built-in RS485 Fieldbus serial port and optional RS485 BMS serial port. The RS485 Fieldbus serial line can be connected to 2 Power+ inverters and up to 5 MPXPRO/UltraCella controllers. The addresses are deﬁ ned as shown in the following table. To simplify commissioning with the default settings, it is recommended to set the MPXPRO/UltraCella controllers with consecutive addresses, starting from address 11. The following table shows the default values of serial addresses for the connected MPXPRO/UltraCella controllers.

Device Address Device Address

Power+ 1 MPXPRO/UltraCella 3 13

Power+ 3 MPXPRO/UltraCella 4 14 MPXPRO/UltraCella 1 11 MPXPRO/UltraCella 5 15 MPXPRO/UltraCella 2 12

Serial address 3 is used for the parallel compressor inverter when this is featured in the LT application.

Note: For LT units, the two inverter addresses must be 1 and 3. To set these addresses (1 and 3), the corresponding dipswitches are set to 0 and 2, which when added to the basic address (1) will give the ﬁ nal addresses 1 and 3 (see the paragraph "Network address" on page 13).

ENG

Supervisory system

Fieldbus - Modbus® RS485

C1 C2

L1/L L2/N L3 U V W

12 345678910

C1 C2

L1/L L2/N L3 U V W

12 345678910

max 5 units

RX-/TX-

RX+/TX+

GND

Vout

RX-/TX-

RX+/TX+

GND

OFF

J11

J12

J10

J14

J16

J17

J18

J19

J20

J21

J22

J23

J24

J13

RPRV valve

J6J8J7

High voltage

master

AUX

MPXPRO

High voltage

master

AUX

MPXPRO

master

EVDEVO EVDEVOmaster

Fig. 2.n

Note: system communication is only compatible with MPXpro SW.

Important:

• A possible short circuit on the Fieldbus serial line will compromise

operation of the system compressor.

• As there is no software control on the connected device (MPXpro,

Ultracella), make sure during conﬁ guration to set these correctly, based on the physical address selected on the evaporator controller.

• To set the power+, MPXpro and UltraCella addresses, see the

corresponding manuals.

Important: The system is only compatible with MPXpro SW revision ≥ 4.0 and UltraCella SW revision ≥ 2.0

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

2.10 Installation

For installation proceed as follows, with reference to the wiring diagrams:

• before performing any operations on the control board, disconnect

the main power supply by turning the main switch in the electrical panel OFF;

• avoid touching the control board, as electrostatic discharges may

damage the electronic components;

• the index of protection required for the application must be ensured

by the manufacturer of the cabinet or by suitable assembly of the controller;

• if there are several condensing units connected to the same electrical

panel, use a B or B+ residual current device when the compressors are controlled by inverter; these protection devices must always be installed always upstream of any AC/A/F RCDs (see the ﬁ gure below):

Tipo

AC/A/F

Tipo

AC/A/F

IΔn≥300 mA

IΔn≤100 mA

Tipo

B/B+

kHz

IΔn≥30 mA

• use cable ends suitable for the corresponding terminals. Loosen each

screw and insert the cable ends, then tighten the screws and lightly tug the cables to check correct tightness;

• separate as much as possible the probe and digital input cables from

cables to inductive loads and power cables, so as to avoid possible electromagnetic disturbance. Never run power cables (including the electrical panel cables) and probe signal cables in the same conduits;

• do not install the probe cables in the immediate vicinity of power

devices (contactors, circuit breakers, etc.);

• reduce the path of probe cables as much as possible, and avoid spiral

paths that enclose power devices.

Important: Class A software structure: the thermal protection devices for overload and high pressure must act directly on the compressor actuator, and must therefore be wired in series with the compressor contactor coil control.

Note: serial connection starts from terminal J10 on Hecu CO2 and runs through the power+ inverter and all the MPXPRO controllers installed on the refrigerated units. The maximum number of MPXPRO controllers is 5, the limit for this application. The following recommendations must be observed:

• connect the two twisted wires to the Tx/Rx+ and Tx/Rx- terminals;

• connect the single wire to the GND terminal;

• connect the shield to earth at one end only;

• use a shielded cable (e.g. Belden 3106A - AWG 22);

• For supervisor serial network connection only: connect a 120 Ω

terminating resistor between the Tx/Rx+ and Tx/Rx- terminals on the last controller in the network (the one furthest away from Hecu).

Earth

Fig. 2.o

• connect any digital inputs, Lmax = 10 m;

• connect the temperature and pressure probes, Lmax = 10m;

• connect the electronic expansion valve cable the connectors J17 and

J21;

• connect the inverter serial communication cable to terminal J10 (if

featured);

• connect the PGDe terminal (required for commissioning) to connector

J17;

• connect the power supply to the controller and the inverter, where

featured;

• program the controller using the guided commissioning procedure:

see the chapter on “Commissioning”.

• connect the electrical loads to the relay outputs only after having

programmed the controller. Carefully evaluate the maximum ratings of the relay outputs as indicated in the Technical speciﬁ cations;

• connect the supervisor serial line to the optional BMS RS485 card.

Important: avoid installing the controllers in environments with

the following characteristics:

• relative humidity greater than 90% or with condensation;

• strong vibrations or knocks;

• exposure to water sprays;

• exposure to aggressive and polluting atmospheres (e.g.: sulphur and

ammonia gases, saline mist, smoke) which may cause corrosion and/ or oxidation;

• strong magnetic and/or radio frequency interference (thus avoid

installation near transmitting antennae);

• exposure to direct sunlight and the elements in general.

Device 1

AWG 20/22

Signals (+/-)

GND

Device 2

Device n

Important: the following warnings must be observed when

connecting the controllers:

• incorrect connection to the power supply may seriously damage the

controller;

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

3. USER INTERFACE

ENG

3.1 Graphic terminal

The Hecu CO2 user interface is the pGDE terminal, in the panel or builtin version. The functions associated with the 6 buttons on the pGDE terminal are the same on all screens, and are described in the table.

Functions of the 6 buttons

Button Associated function

(ALARM) Displays the list of active alarms and accesses the alarm log

Used to enter the main menu tree

Returns to the higher level screen

(UP) Scrolls a list upwards or increases the value highlighted by the

(DOWN) Scrolls a list downwards or decreases the value highlighted by

(ENTER) Enters the selected sub-menu or conﬁ rms the set value

The LEDs associated with the buttons have the following meaning.

Meaning of the LEDs

LED Button Meaning

Red

Yellow

Green

cursor

the cursor

Tab. 3.a

Flashing: active and unacknowledged alarms Steady: acknowledged alarms

Hecu CO2 on

Hecu CO2 powered

Tab. 3.b

Menu screen

An example of the menu screens is shown in the ﬁ gure:

Fig. 3.b

The selected item number is shown in the top right corner. The buttons are used to select the desired menu item, while

selected item.

accesses the

Parameter display/setting screen

An example of a parameter display/setting screen is shown in the ﬁ gure, which highlights the ﬁ elds and icons used:

3.2 Description on the display

There are three basic types of screens shown to the user:

• Main screen

• Menu screen

• Parameter display/setting screen

Main screen

The main screen is the screen that the Hecu CO2 software automatically returns to 5 minutes after the last button was pressed. An example of a main screen is shown in the ﬁ gure, which highlights the ﬁ elds and icons used:

Fig. 3.a

1 Time and date 2 Main values 3 Unit status (unit oﬀ ) or compressor and fan status (unit on) 4 Active alarm signals and manual operation status 5 Access to further information screens (menu branch Aa) by pressing ENTER

Fig. 3.c

1 Menu branch identiﬁ er 2 Screen identiﬁ er 3 Parameters

The screen identiﬁ er uniquely identiﬁ es the menu branch and the screen: the ﬁ rst characters indicate the menu branch, while the last two alphanumeric digits identify the screen inside the menu; for example, screen Bab01 is the ﬁ rst screen in menu Bab

Note:

• The information shown on the main screen varies according to

the system conﬁ guration and the control value used (pressure or temperature).

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

4.1 Main menu

4. MENU DESCRIPTION

To navigate the menu tree, use the following buttons:

• & : navigate sub-menus, screens and

ranges of values and settings;

• : conﬁ rm and save the changes made;

• : return to the previous menu

A.Unit Status

B.Input/Output

C.Compressors

D.Condensers

E.Evaporators

F.Other functions

G.Configurations

H.Safety

a.Main Info b.Setpoint c.ON/OFF a.Status a.Dig.In.

b.Manual man. a.Dig.Out

c.Test a.Dig.Out

a.MT/LT compr. b.PAR compr.(ONLY LT)

a.Oil a.I/O status

b.defrost a.I/O status

c.Economizer a.I/O status

d.Injection a.I/O status

e.Heat recovery a.I/O status

f.Gen. functions a.Stages

g.Chillbooster a.I/O status

h.Transcritical a.I/O

i.DSS a.I/O status

a.Clock a.Time bands

b.Language c.BMS d.Fieldbus e.Password a.History b.Prevent c.Alarm configuration

b.Analog In. c.Dig.Out d.Analog Out

b.Analog Out c.usc.BLDC d.vacuum

b.Analog Out a.I/O status

Regulation

b. c.Op. hours d.Energy save e.Alarms f.Configuration g.Advanced a.I/O status b.Regolation c.EEV d.Energy save e.Alarms f.Configuration g.Advanced a.Stato I/O b.Configuration c.Regulation d.EVD driver

b.Settings

b.Settings c.info

b.Regulation

b.Modulation c.Alarms d.Time bands e.I/O status

b.Regulation

b.Settings c.EVOsettings

b.settings

b.Settings

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

I.Info

L.Setup

a.Pre-configuration not available b.Wizard c.Advanced config. not available d.Default

5. COMMISSIONING

ENG

5.1 Guided commissioning procedure

Hecu CO2 can be setup the ﬁ rst time from the pGDe or pLDpro user terminal. If the controller has not yet been conﬁ gured, the user terminal shows the ﬁ rst screen in a guided conﬁ guration procedure, called the wizard. Otherwise, the same menu can be accessed from branch: L Setup >> b.wizard.

The main parameters needed for general conﬁ guration are shown one at a time. The wizard screens are all numbered in the top right corner; the following explanations refer to this number. To go from one screen to the next press È, to return to the previous screen press Ç.

Screen Lb01: indicates the type of system, medium or low temperature.

Screen Lb02: change unit of measure from SI (°C, barg) to Imperial (°F,

psig).

Screen Lb03: indicates the type and number of compressors.

Screen Lb08: indicates the compressor control set point and diﬀ erential

set as default by CAREL based on the type of application and the refrigerant. The type of control is always proportional and integral, and when exiting the wizard, control will be ﬁ xed set point only until conﬁ guring communication with the cabinets, when the ﬂ oating suction pressure set point can be enabled.

Screen Lb91: indicates the number of fans. A maximum of two fans can be selected.

Screen Lb04: indicates the type of modulating device associated with the compressor selected in the previous screen.

Screen Lb05: indicates the BLDC compressor model and the power+ inverter serial address (always = 1). This is used to understand whether the inverter is on and connected via serial with Hecu.

Screen Lb06: indicates whether the connected model of inverter is compatible and if so automatically downloads some typical compressor parameters to the inverter. The parameters can also be written manually by selecting “Yes” for Write default.

Screen Lb92: indicates the type of fans, ON-OFF, modulating PWM or 0-10 V.

Screen Lb95: indicates gas cooler control based on temperature.

Screen Lb96 Lb97: indicates the type of control and the working set

point and diﬀ erential for the fans.

Screen Lb99: indicates which valves have been installed on the unit for management of CO2, and the type

Screen Lb3a: indicates the end of the wizard procedure. Pressing ENTER ends the procedure, and the system will be conﬁ gured based on the options selected.

Screen Lb07: indicates compressor control based on pressure and the corresponding refrigerant.

Important: wait a few seconds for the automatic default value

download procedure to be completed.

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

6. FUNCTIONS

6.1 Unit ON/OFF

The unit can be switched on and oﬀ as follows:

• User terminal

• Supervisor

• Digital input

On-oﬀ from the user terminal and the conﬁ guration parameters are available under the main menu, branch Ac

On-oﬀ from the supervisor and from the digital input and start-up after a blackout (with speciﬁ c delay, to avoid continuous starts and stops in the event of instability in the power supply) need be enabled.

On-oﬀ from the digital input is equivalent to an enabling signal, that is, if the digital input is Oﬀ the unit cannot be switched on in any other way, while if it is On, the unit can be switched on or oﬀ in any other way, with the same priority (the most recent has precedence, whatever the origin), as shown in the ﬁ gure:

Digital Input

User interface

Supervisor

Unit On/O

Fig. 6.a

Note: certain special conditions or functions in the Hecu CO2 software require the unit to be powered oﬀ :

• Conﬁ guration of certain parameters: e.g. inputs/outputs, conﬁ guration

of compressors, inverter parameters.

• Installation of default parameters

• Manual management

Manual con guration

Hecu CO2 automatically downloads the optimised parameters for each model of compressor at the end of the wizard procedure. If the model of compressor is changed or the power+ is replaced, the new system can be conﬁ gured manually under Compressors Æ Advanced

Æscreen Cag01.

Hecu CO2 and power+ must be powered and connected via serial; the address of power+ must be 1 (default). The type of compressor is selected from the list of available compressors; the number of motor poles and the correct model of power+ are deﬁ ned automatically.

Select YES for Set defaults and press ENTER.

If the model of power+ (as read by power+) is the same model or larger than the power+ selected based on the type of BLDC compressor, the default values can be written and Hecu CO2 can control the compressor. Otherwise, the message "Not compatible" will be shown.

Envelope management

The envelope is the set of operating points in which a compressor can operate safely for an indeﬁ nite time. This can be represented graphically by drawing the limits inside which the operating conditions must be maintained. The ﬁ gure shows the envelope for the Toshiba DY/RY series compressors.

6.2 BLDC compressor

A maximum of 2 BLDC compressors can be managed using the Power+ inverter. The type of compressor is selected under Compressors Æ Conﬁ guration (Cag01).

The BLDC compressor is managed via Modbus and works only if connected to a CAREL power+ inverter. If there is no communication with the inverter, the compressor will not be able to operate.

Below is the list of compressors that are currently available:

Medium and low temperature with PSD1 (R744)

Compressor HPV RPRV Inverter Capacity

TOSHIBA DY30 E2V09CS1C0 E2V11CS1C0 PSD101021A 0.3 - 2.8 kW TOSHIBA DY45 E2V11CS1C0 E2V14CS1C0 PSD1012200 0.5 - 4.2 kW TOSHIBA DY67 E2V14CS1C0 E2V18CS1C0 PSD1016200 0.7 - 6.3 kW TOSHIBA RY100 E2V18CS1C0 E2V24CS1C0 PSD1018400 1.0 - 8.8 kW

Medium and low temperature with PSD2 (R744)

Compressor HPV RPRV Inverter Capacity

TOSHIBA DY30 E2V09CS1C0 E2V11CS1C0 PS200122041*0 0.3 - 2.8 kW TOSHIBA DY45 E2V11CS1C0 E2V14CS1C0 PS200122041*0 0.5 - 4.2 kW TOSHIBA DY67 E2V14CS1C0 E2V18CS1C0 PS200152041*0 0.7 - 6.3 kW TOSHIBA RY100 E2V18CS1C0 E2V24CS1C0 PS200184041*0 1.0 - 8.8 kW

* =0: no PEC version; * =1: PEC version

Note: go to ksa.carel.com to check the updated list of compressors available, with reference to the “DC compressor availability table”

+050001835.

E2VSTA0310 unipolar stator Tevap. = -10°C

E2VSTA0310

unipolar stator

TGC = 32°C

Tab. 6.a

Tevap. = -10°C

TGC = 32°C

Tab. 6.b

Discharge

pressure

Pd max

Pd min

Ps min Ps max

Fig. 6.b

The envelope limits consist of:

Suction pressure

• Minimum and maximum discharge pressure

• Minimum and maximum suction pressure

• Minimum and maximum compression ratio (CR)

• Maximum current drawn by the compressor

The operating conditions are deﬁ ned by:

• Suction pressure

• Discharge pressure

• Discharge temperature

• Rotation speed (rps)

The maximum discharge pressure can be limited due to construction requirements of the circuit; in this case, a limit will be applied to the maximum discharge temperature. The shape of the envelope can change as compressor speed varies, and with this the operating conditions that are considered safe for the compressor. It is therefore possible that a certain pair of operating pressures is considered safe (inside the envelope) at a certain speed, and unsafe (outside of envelope) at another speed.

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

If the operating conditions are close to the envelope limit or outside of this, the controller applies corrective actions in an attempt to keep the operating point inside the limits speciﬁ ed by the manufacturer. It is therefore possible that in such cases, the actual compressor speed does not correspond to the cooling capacity request of the temperature controller, that superheat is not maintained at the set point, or that the discharge pressure is not kept at the optimal value. If the operating conditions remain outside of the envelope for a time exceeding the alarm threshold (screen Cag55, default 60 s), the compressor is stopped and an out-of-envelope alarm is signalled.

Discharge pressure

Suction pressure

Fig. 6.c

The following zones are deﬁ ned (see Figure 6.e):

1. Inside the envelope 6. Low compression ratio

2. High compression ratio 7. Low diﬀ erential pressure

3. High discharge pressure 8. Low discharge pressure

5. High evaporation pressure 9. Low evaporation pressure

Compressor prevent function:

by managing the envelope, compressor "Prevent" actions can be applied to attempt to avoid shutdown due to the high discharge pressure and temperature thresholds. The settings are made on the following screens:

Timers

The timers include a minimum On time, a minimum Oﬀ time and a minimum time between two consecutive starts. These parameters can be set on screen Caf35:

The logic is described in the following graph:

Comp

OFF

min ON

time

min OFF

time

min time to start

same compressor

Fig. 6.d

time

10s

Force compressor OFF:

The compressor can be forced OFF if the suction pressure falls below the threshold for a set delay time; these parameters are set on the following screen:

Start-up

Hecu CO2 manages compressor start-up in the best way possible, adapting operating speed so as to guarantee that the desired conditions and excellent lubrication are reached very quickly. For this reason, when starting the compressor is operated at a settable ﬁ xed speed (Cag52) for the minimum ON time, Fig. 6.c. During this stage, the out-of-envelope alarm is disabled, but speed control remains active if approaching or exceeding zone 2 (maximum compression ratio), 3 (maximum condensing pressure) or 4 (current limit). The corresponding parameters are found under Compressors Æ

Advanced Æ screen Cag52:

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

rps

Start-up

speed

min ON

time

min rps

Req

If after 15 seconds from when the compressor starts the pressure diﬀ erential is less than 0.2 barg above the value measured on starting, Hecu CO2 stops the compressor and generates a "No compressor startup” alarm. This alarm is automatically reset and Hecu CO2 tries to start the compressor ﬁ ve times after a 30 second delay. After the ﬁ fth attempt the alarm is no longer automatically reset. The corresponding parameters are found under Compressors Æ

Advanced Æ screens Cag50, Cag51:

Req = min rps

time

Fig. 6.e

If equalisation is based on the pressure diﬀ erential (delta), the controller measures the DeltaP between compressor suction and discharge pressure. When the diﬀ erential is below the value set on screen Cag49, the compressor is enabled to start.

In the event of timed equalisation, the controller will not measure the pressure diﬀ erential but rather will enable the compressor to start after a ﬁ xed equalisation time, equal to the minimum compressor oﬀ time, which can be set on screen Caf35.

Pressure di erential during start-up

The BLDC compressor cannot start if the pressure diﬀ erential is greater than a threshold deﬁ ned by the compressor manufacturer. This limit depends on the maximum current delivered by the inverter. As soon as the pressure diﬀ erential falls below the minimum threshold, the compressor can start. The corresponding parameters are found under Compressors Æ

Advanced Æ screen Cag49:

When the pressure diﬀ erential is below 1 barg – 0.5 barg (ﬁ xed value), the compressor is ready to start.

Equalisation

Hecu CO2 makes it possible to equalise the pressure across the compressor, simplifying condensing unit start-up. The equalisation mode can be selected on screen Caf18: either "DELTA PRESSURE" or "TIME".

The valves used for equalisation and the percentage of opening to be maintained during the procedure can be set on screen Caf19. For Hecu CO2, the following valves can be selected: HPV, RPRV and bypass solenoid.

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

After compressor start-up, a delay can be set on screen Caf32 for closing the selected equalisation valves.

For the LT conﬁ guration, LT compressor equalisation can only be managed using the bypass solenoid valve.

ENG

Compressor crankcase heater:

Crankcase heating for BLDC compressors is required when the system is being evacuated and oil lubrication is reduced due the presence of water droplets, or when the compressor is oﬀ at low outside temperatures. This function can be activated even without using an external heater, but rather exploiting a special function implemented in the inverter that controls the compressor. The function is selected on the following screens:

DSH control

Hecu CO2 controls superheat on the compressor discharge line at the same time as superheat on the suction line.

If suction superheat is less than 0K and discharge superheat is less than 10K, a countdown starts to set oﬀ the corresponding alarm (DSH Low Liquid Flowback). The alarm activation delay can be set on screen Cae41 and can be diﬀ erentiated for diﬀ erent stages of operation: compressor start-up, steady operation, defrost/washing active.

Vacuum function:

A manual procedure is available to evacuate the system; to do this, follow the steps described in the Manual Management Branch (Bbdxx).

Screen Cag44 is used to deactivate the function based on the outside/ ambient temperature; if "COMP OFF" mode is selected on screen Cag43. For Toshiba compressors, the recommended values to be set for the Crankcase current (Cag43) must be between the minimum and maximum values shown in the following table:

Compressor model

Toshiba DY30 39 15 74 55 Toshiba DY45 39 15 74 55 Toshiba DY67 35 13 67 47 Toshiba RY100 24 15 46 55

(*) The crankcase current percentage value and the three-phase heat generated in the motor windings (minimum and maximum) are calculated at an ambient temperature of 25°C. The current value to be applied can be adjusted depending on the outside temperature, considering that it is not possible to exceed a temperature of 55°C in the rotor windings when the unit is oﬀ .

Crankcase set

% (min)*

Winding heat

3PH [W]

Crankcase set

% (max)*

Winding heat

3PH [W]

Tab. 6.c

6.3 Compressor control

Control can be proportional or proportional + integral (P, P+I). The corresponding parameters are found under Compressors Æ Control Æ

screen Cab14.

The set point is in the centre of the band. Proportional control is illustrated in the following ﬁ gure:

During this procedure, the compressor crankcase can be preheated (see the crankcase heating function), however at the end the initial conﬁ guration needs to be reset, on screen Bbd03 or Cag43.

Regulation request

100%

Dierenziale

Setpoint

Regulation

probe value

Fig. 6.f

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

With proportional + integral control, the integral time is summed to the eﬀ ect of proportional control, giving a null control error in steady operation. This type of control is illustrated in the following ﬁ gure:

Regulation

variable

The integral action depends on time and the deviation from the set point. The integral time represents how fast integral control is implemented:

P+I

Setpoint

time

Fig. 6.g

• Low values bring fast actions yet more instability

• High values bring slower actions and more stability

The values should not be set too low, to avoid system instability.

Two types of control can be set, in loop Compressors Æ Control Æ screen Cab01

• Fixed set point

• Floating set point

Floating set point

This software function is available by exploiting serial communication with the evaporators. Serial communication allows information to be exchanged in real time between the main Hecu CO2 controller and the MPXPRO devices.

Hecu CO2 uses an advanced algorithm to adapt the condensing unit suction pressure set point based on the request from each evaporator, then weighing it according to evaporator capacity. Signiﬁ cant variations in request due to certain evaporator operating states, such as defrost, are managed by Hecu, maintaining ﬁ ne, stable control.

Suction

pressure

energy eciency

Fig. 6.h

The ﬂ oating set point will then be managed using proportional + integral control, the parameters of which can be set on screen Cab14.

Max Set point

Min Set point

time

Pumpdown

The compressor OFF function by pumpdown can be enabled on screen Cag03. This function keeps the compressor on until the pumpdown pressure threshold is reached, within the maximum time set on the same screen.

Note: the MPXPRO controllers installed on the evaporators implement the Smooth Lines function (see MPXPRO manual +0300055). This function signiﬁ cantly reduces the number of ON-OFF cycles in traditional control by modulating the evaporator temperature using an electronic expansion valve and adapting the superheat set point using appropriate PI control based on the eﬀ ective control temperature.

This function can be enabled and conﬁ gured manually or automatically.

• The automatic procedure involves the Fast Commissioning operation

described in chapter 7, which automatically conﬁ gures the control parameters on both the condensing unit and the evaporators, using the default values optimised by CAREL, yet amply modiﬁ able.

• To conﬁ gure the function manually, make sure that there is a serial

connection with the MPXPRO controllers on the evaporators, and choose the type of control on screen Cab01. The Smooth Lines function will then need to be conﬁ gured on the MPXPRO controllers, as described in the next chapter.

The unit ﬂ oating suction pressure set point can vary between a settable minimum and maximum value. The minimum and maximum limits for the ﬂ oating set point are shown on screen Cab04, in line with the limits set on screen Cab02.

Low ambient (outside) temperature prevention:

This function prevents the unit from stopping due to low outside temperatures. The function can be activated if all of the following conditions are true:

1. Enabling selected

2. The evaporator request is greater than 0% (MPXPRO or ULTRACELLA

connected) or "Enable compressor from DI" is ACTIVE or the diﬀ erential pressure threshold (Prec - Psuc) is less than the set value (default 2 bars).

3. The outside temperature is less than the value set (default -18°C)

4. The compressor request is = 0% and the compressor speed is = 0 for

longer than the set time (default 30 minutes)

The settings are made on the following screen

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

When the function is activated:

1. The compressor set point is decreased by a settable value (default 8

bars) within the time set on the same screen

The function can be deactivated when at least one of the following conditions is true:

1. Compressor control OFF

2. Active compressor alarms

3. The cut-oﬀ threshold has been reached (P suction < cut-oﬀ threshold)

4. The evaporator request is equal to 0% (from MPXPRO or ULTRACELLA)

or "Enable compressor from DI" is NOT ACTIVE (OFF due to control)

5. The compressor has been active for longer than a settable timeout

(default 10 minutes)

6. The suction pressure is greater than the operating set point

7. The outside temperature is greater than the set threshold (default

-18°C) + the diﬀ erential (default 8°C) set on the following screen

ENG

DSS3: screen Fib04

Start the parallel compressor (L1) when starting the LT compressor (L2). If NO is selected, the parallel compressor cannot start without a request.

When DSS1 is enabled, the following parameters remain hidden on screen Fib04:

• Switch on period: 180s (hidden). During this period, the parallel

compressor request is forced to 50% to allow it to be started;

• Timeout: 180s (hidden). The LT compressor waits for the parallel

compressor to start, however is switched on in any case after the set timeout has elapsed;

• Force oﬀ line 2 if line 1 is oﬀ : YES (hidden). The LT compressor (L2) is

switched oﬀ when the parallel compressor (L1) is switched oﬀ .

When DSS1 is NOT enabled, the following parameters can be modiﬁ ed on screen Fib04:

When the function is deactivated: The compressor set point is reset to its normal value over a set time (default 2 min, see time on screen Cad15).

6.4 Compressor management on LT units (DSS and independent)

Management with DSS1 and DSS3

This involves synchronised management of the compressors. It is recommended to activate both DSS1 and DSS3 so as to avoid simultaneous compressor starts and optimise operation of the LT stage in all operating conditions. Below is a description of the functions that can be set:

DSS1: screen Fib02

This function prevents the two compressors from starting simultaneously. Once the required percentage for activation has been reached, the LT compressor waits for the parallel compressor to start, and then is turn started after a set delay.

• Switch on period: 0-999s (def 180, this is the time that the parallel

compressor request is forced to 50% to allow it to start);

• Timeout: 0-999s (def. 180s; this is the time that the LT compressor waits

for the parallel compressor to start, after the set timeout it is switched on in any case);

• Force oﬀ line 2 if line 1 is oﬀ : NO/YES.

• YES Æ forces the LT compressor oﬀ if the parallel compressor cannot

start.

• NO Æ forces the LT compressor oﬀ if there is an alarm on the parallel

compressor.

Independent management

Activating independent management on screen Fib05 automatically disables DSS1 and DSS3, and the compressors can be switched on/oﬀ independently, based on their own request. Some safety logic s also guaranteed. Below is a description of the functions that can be set.

By selecting YES, functions DSS1 and DSS3 are automatically disabled and:

• the LT compressor can start even if activation of the parallel compressor

is NOT requested;

• the LT compressor cannot start if the parallel compressor is oﬀ due to

timing or alarms;

• the Parallel compressor is not activated if the LT compressor is not

operating (no LT required, LT compressor oﬀ due to timing or alarms).

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

Safety functions (active only if "Independent start of compressors" is set to YES):

Par. start for high rec. pressure:

Env. lim. for LT high dis. pressure:

LT cut-o thr. If par. can’t start:

Force the parallel compressor on in the event of high pressure in the receiver even if the LT compressor is switched oﬀ due to no request or alarms (default threshold: 60 barg, settable). High pressure prevention based on the LT compressor envelope. Sets the condensing/discharge pressure limit at the selected value, recommended threshold 45 barg (settable). When the LT compressor discharge pressure exceeds the set threshold, the controller begins to reduce compressor speed in order to return to normal operating conditions (i.e. inside the envelope). If the discharge pressure remains above the set threshold, the compressor can be switched oﬀ due to the envelope alarm (after the standard timeout for the envelope alarm). Threshold=0barg Æ function not active. Cut-oﬀ due to LT compressor high pressure. The function is activated when the parallel compressor is oﬀ due to timing or alarms (default 50 barg, settable).

Tab. 6.d

Parallel compressor:  oating set point

The receiver pressure and therefore the parallel compressor set point is calculated according to the following relationship:

Fan operation with modulating device

If the fans are controlled by a modulating device, the meaning of the parameters that associate the minimum and maximum values of the device’s modulating output and the minimum and maximum capacity of the modulating device on screens Dg01 and Dg02 is illustrated in the following examples.

Example 1: minimum modulating output value 0 V, maximum value 10 V, minimum modulating device capacity 0%, maximum value 100%.

Analog output

Max output value = 10 V

Min output

value = 0 V

Min capacity = 0%

Set point

Dierential Dierential

Max capacity = 100%

Regulation probe value

6.5 Fans

Hecu CO2 can manage up to two fans with a speed modulation device, which may be an inverter or a PWM phase control device. In the same way as for the compressors, fan control can be proportional or proportional plus integral, based on pressure or temperature.

Fig. 6.i

Example 2: minimum modulating output value 0 V, maximum value 10 V, minimum modulating device capacity 60 %, maximum value 100%.

Analog output

Max output

value = 10 V

Min output

value = 0 V

Min capacity = 60%

Set point

Dierential Dierential

Max capacity = 100%

Regulation probe value

Fig. 6.j

Example 3: minimum modulating output value 2 V, maximum value 10 V, minimum modulating device capacity 60 %, maximum value 100%.

Analog output

Max output

value = 10 V

Min capacity = 60%

Min output

value = 0 V

Set point

Dierential Dierential

Max capacity = 100%

Regulation probe value

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

Fig. 6.k

ENG

Cut-o

Hecu CO2 manages a cut-oﬀ control function for the fans; the function can be enabled and the related parameters set in main menu branch Db05. The operating principle of the cut-oﬀ function is shown in the ﬁ gure:

Regulation

request

Max

output value

Cut-O value

of request

Cut-O Set point Regulation Set point

Dierential Dierential

Max capacity = 100%

Regulation probe value

Fig. 6.l

A percentage of the control request and a cut-oﬀ set point can be set. When the control request reaches the set cut-oﬀ value, this value is kept constant until the control value falls below the cut-oﬀ set point, after which it falls to 0 % and remains there until the request exceeds the cutoﬀ value again.

Fans with compressor OFF

The fans can be stopped after a delay from when the compressor is switched OFF. Furthermore, they can be restarted before the compressor starts, when the request is increasing. These settings are made on screen Db04.

Floating setpoint

Setpoint

oset

Min

external temperature

time

Fig. 6.m

6.6 Oil management

Oil injection

Oil return is a critical factor when using BLDC compressors. Hecu CO2 can manage three diﬀ erent solutions for injecting return oil to the compressor. The related conﬁ gurations can be set on screen Fab15.

Capillary valve

The simplest solution is to use a capillary valve, with ﬁ xed opening, calibrated based on rated conditions. This solution however creates ineﬃ ciencies, by injecting or less oil than required by the compressor.

standard

oil separator

BLDC compressor

Speed up

Hecu CO2 can manage the speed up function, used to overcome the initial inertia of the fans. The function can be enabled and the related parameters set in main menu branch Dg13. If speed up is enabled, a start time can be set in which the fan speed is forced to 100%. If the outside temperature sensor is used, moreover, a threshold can be set (with reset diﬀ erential) below which speed up is disabled, so as to not drastically lower the condensing pressure at startup.

Floating condensing pressure set point

For the condenser line, the ﬂ oating set point enabled on screen Dd05) is based on the outside temperature. The ﬂ oating condensing pressure set point is achieved by adding a constant programmable value to the outside temperature and limiting the resulting value between a settable minimum (Db02) and the set point deﬁ ned on screen Dd06, as shown in the ﬁ gure:

capillary

Fig. 6.n

Electronic expansion valve (EEV COMP SPEED)

This solution involves a CAREL expansion valve. Valve opening is calibrated based on the BLDC compressor operating conditions, adjusted proportionally based on compressor speed. A standard oil separator can be installed to exploit this function. The control algorithm is represented in the following graph, and the parameters can be conﬁ gured on screen Fab18.

standard

oil separator

EEV valve

BLDC compressor

Fig. 6.o

Opening valve (%)

Max open. valve

Min open. valve

Min Speed Max speed

Fig. 6.p

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

Compressor

Speed (lps)

ENG

Electronic expansion valve (EEV LEVEL MNG)

This solution involves a CAREL expansion valve. The valve opening is calibrated based on normal system operating conditions. This solution is very eﬃ cient from an energy viewpoint, as it injects the exact quantity of oil needed by the compressor. In order to use this function, an advanced oil separator needs to be installed, featuring a level sensor that deﬁ nes three states via two digital inputs, conﬁ gurable on screens Faa55, Faa56. An advanced algorithm calculates valve opening based on the time that elapses between the various states, comparing this against the previous measurements. The objective is to replicate the oil level inside the compressor by measuring the amount in the separator and keeping this level stable over time.

advanced

oil separator

(double oil level)

EEV valve

BLDC compressor

Fig. 6.q

On screen Fab20, two preventive thresholds can be set for the high and low oil level (Emergency HL and LL). If the oil remains at this level for the set time, the valve will open to the maximum (HL) or minimum (LL), moving at 1 step/sec.

Electronic expansion valve controlled by external driver (EEV COMP SPEED)

This solution features an expansion valve driven by an external driver (EVDevo, EVD mini), conﬁ gured as a positioner that receives the 0...10 V control signal from the Hecu unit. This is exploited when integrated drivers for the oil valve cannot be used on Hecu CO2 as they are reserved for transcritical valves. Valve opening is calibrated based on the BLDC compressor operating conditions (MT or LT, not parallel), adjusted proportionally based on compressor speed. A standard oil separator can be installed to exploit this function. The parameters can be conﬁ gured from screens Bad14 for assigning the analogue output, and Fab15 to enablòe the function.

rps

Speed Force

Thr di.

Speed Thr

Act. Delay Force time

Comp. Speed

Fig. 6.s

Oil Recovery Washing

Another function available on Hecu CO2 to assist oil return to the compressor involves washing the evaporators. This function uses serial

communication between Hecu CO2 and the MPXPRO controllers, and the electronic expansion valves on the evaporators. The oil

recovery washing function sets the superheat set point to 0K for a settable time t1 [default 3 minutes] in order to retrieve the oil spread along the refrigerant circuit; the valve will thus open further, “washing” the evaporator and ﬂ ushing the accumulated oil back the compressor.

standard

oil separator

BLDC compressor

EEV valve

Fig. 6.r

Oil speed boost

This function boosts the return of oil by operating the compressor at a ﬁ xed speed for a set time, thus recovering the oil spread along the refrigerant circuit. This override function is activated if the following conditions are true, see screens Fab15, Fab23:

• Speed boost: YES

• Compressor speed < minimum threshold

• The previous conditions remain for a set time

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

Note: to make this function more eﬀ ective, the electronic expansion valve on the evaporator opens fully at the start of the recovery washing cycle and then its position is controlled automatically based on the new superheat set point.

td is the time at the end of a washing cycle for which compressor speed remains ﬁ xed, and valve opening returns to the same position as prior to activation of the function [default 2 minutes]. If this value is set to 0, at the end of a washing cycle the system will restart without overriding compressor speed and keeping the valve at the previous opening position for a set time. During a washing cycle, the following conditions are set:

• Oil recovery washing: ON

• Smooth Line: OFF

• P3: 0K

• P7: -10K

• St: -50°C

ENG

The following diagram explains operation and control of the electronic expansion valve and the superheat set point:

Cmp speed

EEV Max opening

EEV position

Cabinet SH Cabinet SH

setpoint OK

C1 Washing

C2 Washing

C3 Washing

OFF

Legende:

t1= time ON td= Fixing time function

t1 t1

td td td

Fig. 6.t

Washing of individual cabinets can be conﬁ gured exclusively in sequential mode.

Then select the digital output on screen Faa68.

The DO will be used by third-party controllers (evaporators) to activate cabinet set point compensation: for example, from 5°C to -50°C. This action will open the expansion valve and at the same time the superheat control will remain active to avoid the return of liquid on the unit’s suction line. The number of wash cycles is selected on the following screen.

Note: this function will be less eﬀ ective than the one Carel provides via serial connection of the evaporators managed by MPXPRO and UltraCella controllers.

tON is the duration of each single washing cycle. “N. of washing per day in each evap.” is the number of washing cycles per day for each evaporator. Fixing time is the transition time at the end of each single washing cycle to keep the system in stable conditions. If using evaporators managed by non-Carel controllers (third party devices), a digital output can be used, as described in the following paragraph.

Digital output for cabinet washing

The purpose of this function is to exploit the "Hecu wash" function to enable a digital output that can be used to "wash" evaporators with thirdparty controllers.

To activate this function, the evaporators with MPX/UltraCella controllers must not be enabled, then on screen Fab15 enable the washing cycles as shown below:

Compressor “ready” digital output

On screen Baccm, a digital output can be selected that is activated when the compressor is "ready". This means that it is able to deliver its cooling capacity. On stand-alone units, this can be used as a "control" digital input on the cabinets to improve control/synchronization between the condensing unit and the evaporators. The function is NOT active when:

• The compressor is oﬀ due to timers (minimum Oﬀ time or timer

between starts)

• The compressor is oﬀ due to cut-oﬀ

• On LT units, if the compressor is oﬀ due to the DSS function

• The compressor is oﬀ due to an alarm, with the following exceptions

(to prevent the unit from shutting down):

– Low suction pressure alarm – Low SH

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

Evaporator requests

To roughly synchronise the condenser unit with evaporators managed by third-party controllers (for example, when defrosting), a digital input can be conﬁ gured (on screen Baadh). This means that the compressor does not start until the DI is activated, even if the suction pressure is higher than the set point. The DI is conﬁ gured on the following screen: Screen Baadh

6.7 HPV valve management

Management of the HPV valves, which separates the high pressure part of the system from the medium pressure part, determines the transcritical and subcritical operating mode of the unit. In transcritical mode, the valve is controlled so as to obtain maximum eﬃ ciency, while in subcritical mode subcooling is controlled. The HPV valve has proportional + integral (PI) control, with the set point based on an optimal gas cooler pressure value calculated using the gas cooler pressure and temperature, as described below. Enabling HPV valve management means also enabling system transcritical mode.

The HPV valve can be managed directly by Hecu CO2 via the driver integrated into the controller. The algorithm for calculating the HPV valve control set point can be optimised or customised by the user, using the parameter settings.

Optimised set point calculation

The optimised set point is calculated as shown in the ﬁ gure.

P₁₀₀

max

Pressure (Bar)

HPV OPENING ZONE

UPPER PROPORTIONAL ZONE

T₂₃

LOWER PROPORTIONAL ZONE

min

₁₀₀ T

TRANSCRITICAL ZONE

T₁₂

INTERMEDIATE ZONE

SUBCRITICAL ZONE

pressures at the limit of the transcritical and subcritical zones. This area has the purpose of avoiding discontinuity in the transition between the two zones.

• Upper proportional zone, deﬁ ned by P works with proportional control only between the opening reached at pressure P pressure decreases, the opening of the HPV valve remains constant

and the maximum opening at pressure P

max

< Pgc < P

max

: the valve

100%

. If the

until it returns into the transcritical zone, where control resumes as described previously.

• Lower proportional zone, deﬁ ned by T with proportional control only between the opening reached at temperature T the pressure increases, the opening of the HPV valve remains constant

and the maximum opening at temperature T

min

100%

< Tgc < T

: the valve works

min

100%

. If

until it returns into the subcritical zone, where control resumes as described above. This operating mode can be disabled by parameter.

Custom set point calculation

The custom set point diﬀ ers from optimised control in that the curve in the subcritical phase is a straight line and is deﬁ ned by the user, and therefore the bands and the set point can be customised by the user. The behaviour in the remaining bands is as described for the optimised algorithm.

HPV valve auxiliary functions

HPV valve management includes some auxiliary functions:

• Pre-positioning: when switching the unit ON, the HPV valve remains in a ﬁ xed position set by parameter for a set time, so as to be able to quickly increase the pressure in the receiver. This procedure is reactivated whenever the unit switches OFF or the HPV valve is reset to the minimum position when all of the compressors stop (opt.).

• Close valve with compressors o : if all of the medium temperature compressors are switched oﬀ , the HPV valve can move to the minimum opening when OFF, which can be set by parameter. When a compressor restarts, valve control resumes, with the pre-positioning procedure described in the previous point.

• Minimum and maximum opening values: the minimum opening when OFF (from keypad, digital input or supervisor) and when ON can be diﬀ erentiated, while there is only one maximum opening value.

• Maximum percentage variation: the valve movement cannot exceed the set maximum percentage variation per second.

• Set point  lter: the HPV valve control set point is calculated taking into account the average of the last n samples (maximum 99), so as to avoid sudden variations due to the high variability of the gas cooler outlet temperature.

• Minimum set point: a minimum value can be set for the HPV valve set point; the set point can never fall below this value, regardless of the parameters entered, so as to protect the compressors.

• Set point deviation alarm: if the gas cooler pressure remains too far away from the calculated set point for too long (settable threshold and delay), an alarm can be signalled.

HPV CLOSING ZONE

Enthalpy (KJ/Kg)

Fig. 6.u

The HPV valve is managed according to the area identiﬁ ed, based on the gas cooler outlet temperature and pressure values. To deﬁ ne the zones, the two pressure values P relative to points B and C in the ﬁ gure, and the two temperatures T T

need to be set. In the following diagram, Tgc and Pgc refer to the gas

100%

cooler temperature and pressure.

100%

and P

, the two temperatures T12, T23

max

min

and

The behaviour of the HPV valve in the diﬀ erent zones is as follows:

• Transcritical zone, identiﬁ ed by T works with proportional + integral (PI) control so as to maintain the maximum COP, determined by the optimal pressure P a function of the gas cooler outlet temperature T

• Subcritical zone, identiﬁ ed by T control so as to keep subcooling constant.

• Transition zone, identiﬁ ed by T control, with a pressure set point identiﬁ ed as the intersection of the

≥ T12 and Pgc ≤ P

≤ Tgc ≤ T23: the valve works with PI

min

≤ Tgc ≤ T12: the valve works with PI

ogc

max

calculated as

opt

: the valve

two points B and C in the ﬁ gure, obtained by calculating the optimal

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

Receiver pressure control using the HPV valve

If the receiver pressure falls below the set minimum operating pressure threshold, the dynamic set point calculated for the HPV valve can be adjusted, so as to increase the pressure inside the receiver. An oﬀ set proportional to the deviation from the minimum threshold is subtracted from the calculated set point, so that opening the HPV valve further increases the pressure in the receiver. The oﬀ set is directly proportional to the deviation from the minimum operating threshold, as shown in the ﬁ gure:

Setpoint HPV

OFF. MAX

Pmin Prec min

Fig. 6.y

ENG

Vice-versa, if the receiver pressure rises above the set maximum operating pressure threshold, the dynamic set point calculated for the HPV valve can be adjusted, so as to decrease the pressure inside the receiver.

An oﬀ set proportional to the deviation from the maximum threshold is added to the calculated set point, so that closing the HPV valve further decreases the pressure in the receiver.

The oﬀ set is directly proportional to the deviation from the maximum operating threshold, as shown in the ﬁ gure:

Setpoint HPV

OFFS

REC PREC

Fig. 6.v

max

Summary of HPV valve inputs, outputs and parameters

Below is a summary of the inputs/outputs and parameters used, together with the corresponding conﬁ guration screens. For details, see Appendix A.1.

Summary

Analogue inputs Bab07,

Digital inputs Baade,

Analogue outputs

Digital outputs --- --Parameters

Set Fhb01 Enable HPV valve management, i.e. enable tran-

Deﬁ nition of the zones

Parameters

Control Fhb08 Proportional gain for proportional + integral HPV

of HPV valve inputs, outputs and parameters

Screen Description

Da39 Bab10 Gas cooler outlet temperature Bab09,

Da40 Bab15 Backup outside temperature

Fha04 Bad02,

Fha06

Fhb05-06 P

Fhb07 T

Gas cooler pressure

Gas cooler backup pressure

HPV valve alarm

Valve HPV output

scritical operating mode Select the type of algorithm to be applied for

calculating the pressure set point

upper pressure limit

100%

pressure for the deﬁ nition of the upper

max

proportional zone P

optimum pressure calculated at the transition

critic

temperature between the intermediate zone and the transcritical zone

limit temperature between transcritical zone

and intermediate zone T

limit temperature between intermediate zone

and subcritical zone

temperature for the deﬁ nition of the lower

min

proportional zone

temperature for the deﬁ nition of the valve

100%

complete opening zone Subcooling delta for optimised control

Coeﬃ cient for determining the custom curve

valve control Integral time for proportional + integral HPV valve

control

Safety features Fhb02 Minimum HPV valve opening with unit ON

Safety features Fhb18 HPV valve closing enabled when all line 1 com-

Screen Description

Fhb04 HPV valve opening at start-up during pre-posi-

Fhb09 Enable ﬁ lter action on HPV valve set point

Fhb13 HPV valve safety position Fhb14 Oﬀ set to be applied to the outside temperature in

Fhb15 Enable HPV valve safety procedures Fhb16 High receiver pressure threshold

Fhb17 Low receiver pressure threshold

Fhb20 Enable the warning function when the gas cooler

Fhb03 Maximum HPV valve opening

Fhb30 Maximum HPV valve control set point

Fhb10 Minimum HPV valve control set point

Minimum HPV valve opening with unit OFF

tioning Pre-positioning duration

Number of samples

the event of a gas cooler temperature probe error

Maximum receiver pressure allowed Maximum oﬀ set to be added to the HPV set point when the receiver pressure exceeds the high pressure threshold

Minimum receiver pressure allowed Maximum oﬀ set to be subtracted from the HPV

set point when the receiver pressure falls below the low pressure threshold

pressors are oﬀ HPV valve closing delay when all line 1 compres-

sors are oﬀ

pressure is too far away from the set point for the set time

Diﬀ erence between gas cooler pressure and set point to generate the warning

Delay time before generating the warning

Maximum variation per second allowed for HPV valve output

Enable valve position (delay threshold)

Enable low temperature control (lower proportional zone)

Tab. 6.e

6.8 RPRV valve management

The RPRV valve is managed with PI control so as to keep the pressure inside the CO The RPRV valve can be managed directly by Hecu CO2 via the driver integrated into the controller.

RPRV valve auxiliary functions

RPRV valve management includes some auxiliary functions:

• Pre-positioning: when switching the unit ON, the RPRV valve remains in a ﬁ xed position set by parameter for a set time, so as to be able to quickly increase the pressure in the receiver. This procedure is reactivated whenever the unit switches OFF or the RPRV valve is reset to the minimum position when all of the compressors stop.

• Close valve with compressors o : if all of the medium temperature compressors are switched oﬀ , the RPRV valve can move to the minimum opening when ON, which can be set by parameter. When a compressor restarts, valve control resumes, with the pre-positioning procedure described in the previous point.

• Minimum and maximum opening values: the minimum opening when OFF (from keypad, digital input or supervisor) and when ON can be diﬀ erentiated, while there is only one maximum opening value.

• Maximum percentage variation: the valve movement cannot exceed the set maximum percentage variation per second.

• Maximum receiver pressure: a maximum value can be set for the receiver pressure, beyond which an alarm is signalled and the unit can be shutdown. Shutdown is optional and can be enabled by parameter.

receiver at the set point.

Summary of RPRV valve inputs, outputs and parameters

Below is a summary of the inputs/outputs and parameters used, together with the corresponding conﬁ guration screens. For details, see chapter 6 and Appendix A.1.

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

Summary of RPRV valve inputs/outputs and parameters

Analogue inputs Bab66,

Digital inputs Baadf,

Analogue outputs Bad03,

Digital outputs --- ---

Parameters

Set Fhb21 Enable RPRV valve management Control Fhb25 CO

Parameters

Safety features Fhb22 Minimum RPRV valve opening with unit ON

Screen Description

Fha01

Fha05

Fha07

Fhb23 RPRV valve opening at start-up during pre-po-

Fhb24 Maximum RPRV valve opening

Fhb26 HPV valve safety position Fhb27 RPRV valve closing enabled when all line 1

Fhb28 High receiver pressure alarm threshold

Fhb31 Maximum RPRV valve control set point

RPRV receiver pressure probe

RPRV valve alarm

RPRV valve output

receiver pressure set point

Proportional gain for proportional + integral RPRV valve control

Integral time for proportional + integral RPRV valve control

Minimum RPRV valve opening with unit OFF

sitioning Pre-positioning duration

Maximum variation per second allowed for RPRV valve output

compressors are oﬀ RPRV valve closing delay when all line 1 com-

pressors are oﬀ

High receiver pressure alarm diﬀ erential High receiver pressure alarm delay Type of high receiver pressure alarm reset Enable compressor shutdown with receiver high

pressure alarm

Enable valve position (delay threshold)

Tab. 6.f

6.9 Generic functions

Hecu CO2 can use the free inputs / outputs and certain internal variables for a number of generic functions. The following generic functions are available for each board:

• 5 stages

• 2 modulation functions

• 2 alarms

Each function can be enabled/disabled by digital input and on the user interface. The generic functions can be enabled and the related parameters set in main menu branch Ff To be able to use the free inputs, these ﬁ rst need to be conﬁ gured as generic from probes A to E (analogue inputs) and general inputs from F to J (digital inputs), consequently a maximum of ﬁ ve analogue inputs and ﬁ ve digital inputs can be used. After having conﬁ gured the generic probes, the associated variables can be used as control variables, and the digital inputs as variables for enabling the functions. As well as the generic probes and inputs, other internal variables in the Hecu CO2 software can be used, depending on system conﬁ guration.

Examples:

for analogue variables:

• Suction pressure

• Condensing pressure

• Saturated suction temperature

• Saturated condensing temperature

• Suction temperature

• Discharge temperature

• % of compressors on

• % of fans on

• Superheat

• Subcooling

• Liquid temperature

• % of compressor request

• % of fan request

for digital variables:

• High suction pressure alarm

• Low suction pressure alarm

• High condensing pressure alarm

• Heartbeat

Each generic function can be assigned a unit of measure and a description. Below are descriptions of how the three types of generic functions work.

Stages

Hecu CO2 can manage up to ﬁ ve stage functions, with either direct or reverse operation. In both cases, a set point and a diﬀ erential can be deﬁ ned; operation of the corresponding output is shown in the ﬁ gure below, for both cases:

Direct stage

Di. Di.

Setpoint

Reverse stage

Di. Di.

Setpoint

Regulation

variable

Regulation

variable

Fig. 6.w

If a variable has been set to enable the function, the output connected to the stage will be active when the enabling variable is active. For each stage, there is a high alarm threshold and a low alarm threshold, both absolute values. For each alarm, the activation delay and priority can be conﬁ gured.

Modulation

Hecu CO2 can manage two modulation functions, with either direct or reverse operation. In both cases, a set point and a diﬀ erential can be deﬁ ned; operation of the corresponding output is shown in the ﬁ gure for direct operation, with the cut-oﬀ function also enabled:

Direct modulation

Max

Min

(Cut-o

Value)

Setpoint

Hyster.

Dierential

Regulation

variable

Fig. 6.x

If a variable has been set to enable the function, the output connected to the stage will be active when the enabling variable is active. For each modulation function, there is a high alarm threshold and a low alarm threshold, both absolute values. For each alarm, the activation delay and priority can be conﬁ gured. A minimum and maximum value of the modulation output can also be set, and the cut-oﬀ function enabled, which works as shown in the previous ﬁ gure.

Alarms

Hecu CO2 can manage two alarm functions, by conﬁ guring the digital variable to be monitored, the activation delay, the priority and an optional description. Each generic alarm function can be associated with a digital output for activating external devices when the alarm occurs. One example of a generic alarm functions is detecting gas leaks.

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

6.10 Default value management

Hecu CO2 can manage two diﬀ erent sets of default values:

• user defaults

• Carel defaults

Either of the two sets can be activated from the main menu branch I.d.

Important: after having reset the default values, the Hecu CO2

board needs to be powered oﬀ and on again.

Saving and restoring user default values

Hecu CO2 can save on the controller the exact conﬁ guration set by the user and then reload it at any time. All of the set values are saved, therefore loading the user defaults restores the exact same conditions of the Hecu CO2 controller at the moment the values were saved.

Note: only one user default conﬁ guration can be saved, therefore if saving the values another time, the new values overwrite the previous ones.

Important:

• the procedure for resetting the Carel default values involves clearing

the Hecu permanent memory, therefore the operation is irreversible;

• the user values cannot be reloaded if updating the Hecu software; for

further details please see Chap. 9, which describes how to save the parameters for diﬀ erent versions of the software.

ENG

Loading the Carel default values

The values pre-deﬁ ned by Carel can be loaded at any time, restoring the Hecu CO2 default settings, and therefore repeating the start-up procedure described previously.

Important: he procedure for resetting the Carel default values involves clearing the Hecu permanent memory, therefore the operation is irreversible.

Note: to repeat the Wizard, the Carel default values ﬁ rst need to be reset.

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

7. FAST COMMISSIONING

Once the condensing unit has been conﬁ gured, the MPXPRO/UltraCella controllers installed on the evaporators then need to be conﬁ gured, and subsequently the entire system representing the combination of both. The Fast Commissioning function is an automatic procedure that assists the installer in the ﬁ nal conﬁ guration of the entire system: condensing unit connected via serial with up to ﬁ ve MPXPRO/UltraCella controllers, as described in par. 7.4.

7.1 MPXPRO con guration (SW version ≥ 4.0)

General connection diagram

It is recommended to follow the general connection diagram shown here, so as to simplify the subsequent controller conﬁ guration stage by exploiting many of the pre-deﬁ ned parameters.

Power Supply

AC 115-230 V

200 mA max

AUX4

NO NC CNLCNO

R1 R5R2 R3 R4

AUX3

(

NO NC NCC NO C

AUX1

(

AUX2

(

NCNO C

Warning: Before making any operation on the control board, turn oﬀ the supply mains turning oﬀ the main switch of the electrical panel.

The contemporary operation of both outputs is not granted with any actuator. Please refer to the technical features.

AC 115-230 V 200 mA max

- 0 to10 Vdc Analog output MX3OPA10**

Expansion board:

- PWM driver MX3OPPWM**

- E

V driver MX3OPSTP**

MPX PRO

S5/DI2 S6/DI3 S7/DI4

S2S1 S3

NTC NTC NTC NTC

Probe (sd)

probe (sm)

Air oﬀ temperature

Defrost temperature

S4/DI1

GND

Probe (sr)

Air on temperature

Superheated gas

Probe (tgs)

GND 5Vdc

RATIOMETRIC

Probe (peu/teu)

Pressure/temperature

Saturated evaporation

Once the wiring has been completed, simply follow the wizard that is displayed when the MPXPRO devices are switched on for the ﬁ rst time. Details of this procedure are shown below; for further information see the MPXPRO manual + +0300055EN rel. 1.4 of 16/02/2015..

T.U.I.

VLGNDDI5

Tx/Rx

tLAN

remote infrared IRTRMPX000

Fig. 7.a

20 mA max totally

470 Ω

MCHRTF

LOAD 1

LOAD 2

SSR1

PWM modulating fans

Trim heater

M.S.N. Tx/Rx

GND

Tx/Rx+

Tx/Rx-

Supervisor RS485

12 VPWM1PWM2

Shield

Connection:

IR*U*

AUX

Gnd

Power

Supply

Rx/Tx

1 2 3

VL (25) GND (26)

T.U.I.

Tx/Rx (24)

Power Supply

GND

Rx/Tx

IR*X*

AUX

GND

(see the technical leaﬂets +050000135)

Important: in order to conﬁ gure the entire system, ﬁ rst check that the cabinets are equipped with MPXPRO controllers and the corresponding EEV electronic expansion valve module.

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

Guided commissioning procedure

When ﬁ rst started, MPXPRO opens a guided procedure that helps the user set the main parameters for the conﬁ guration of the electronic valve and the serial network.

Commissioning parameters

Par. Description

/P2 Type of probe, group 2 (S4, S5) /P3 Type of probe, group 3 (S6) /Fd Assign tGS (superheated gas temperature probe) /FE Assign PEu/tEu (saturated evaporation pressure/temperature probe) /U6 Maximum value of probe 6 /L6 Minimum value of probe 6 P1 Electronic valve PH Type of refrigerant In Type of unit Sn Number of slaves in the local network H0 Serial or Master Slave network address

Tab. 7.a

The parameters can be set from the user terminal or the remote control. If using the remote control, a terminal with display and infrared (IR) port is required.

After powering on the controller:

1. the ﬁ rst parameter is displayed: /P2 = type of probe, group 2 (S4, S5)

2. press Set to display the parameter value;

3. press UP/DOWN to modify the value;

4. press Set to conﬁ rm, the “spanner” icon is no longer shown, indicating

that the setting has been performed;

5. press UP and repeat steps 2, 3 & 4 for the subsequent parameters; /P3, /Fd,

/FE, /U6, /L6, P1, PH, In, Sn, H0;

6. press Prg/mute for 5 s to exit the guided commissioning procedure.

/Fd: Assign tGS (superheated gas temperature probe)

This is used to assign the measurement of the superheated gas temperature at the evaporator outlet to the selected probe.

Par. Description Def Min Max UOM

/Fd Assign tGS (superheated gas temperature)

0 = Function disabled 1 = Probe S1 7 = Probe S7 2 = Probe S2 8 = Serial probe S8 3 = Probe S3 9 = Serial probe S9 4 = Probe S4 10 = Serial probe S10 5 = Probe S5 11 = Serial probe S11

6 = Probe S6

0 0 11 -

Tab. 7.d

/FE: Assign PEu/tEu (saturated evaporation pressure/temperature probe)

Assigns the probe used to measure the saturated evaporation pressure/ temperature, which by default is the probe connected to input S6. It is recommended to use the 0 to 5 Vdc ratiometric probe.

Par. Description Def Min Max UOM

/FE Assign PEu/tEu (saturated evaporation pressure/

temperature probe). See /Fd

0 0 11 -

Tab. 7.e

/U6, /L6: Maximum/minimum value of probe S6

Parameters /L6 and /U6 are used to set the maximum and minimum limits for the range of measurement of the probe connected to input S6.

Par. Description Def Min Max UOM

/U6 Maximum value of probe 6 9.3 /L6 160 barg, RH% /L6 Minimum value of probe 6 -1.0 -20 /U6 barg, RH%

Tab. 7.f

MPXPRO

Fig. 7.r

/P2: Type of probe, group 2 (S4, S5)

This is used to select the type of temperature probe to be used for inputs S4 and S5.

Par. Description Def Min Max UOM

/P2 Type of probe, group 2 (S4, S5)

0 = NTC Standard Range –50T90 °C 1 = PTC Standard Range –50T150 °C 2 = PT1000 Standard Range –50T150 °C 3 = NTC L243 Standard Range –50T90 °C

003-

Tab. 7.b

Note: the NTC L243/PTC/PT1000 probes can only be conﬁ gured on

the full optional models or with EEV driver. To assign the functions of the other probes, see parameters /FA, /Fb, /Fc, /Fd, /FE, /FF, /FG, /FH, /FI, /FL, /FM. For calibration, see parameters /c4, /c5.

/P3: Type of probe, group 3 (S6)

Selects the type of temperature or ratiometric pressure probe for input S6.

Par. Description Def Min Max UOM

/P3 Type of probe, group 3 (S6)

0 = NTC Standard Range –50T90 °C

1 = PTC Standard Range –50T150 °C

2 = PT1000 Standard Range –50T150 °C

3 = NTC L243 Standard Range –50T90 °C

4 = 0 to 5 V ratiometric probe

004-

Tab. 7.c

P1: Type of electronic expansion valve

MPXPRO can control the CAREL E2V electronic expansion valve. The CAREL electronic expansion valve is required for the Hecu CO2, and therefore this parameter must always be set to “2”.

Par. Description Def Min Max UOM

P1 Electronic valve

0 = not present 1 = PWM valve 2 = CAREL E

V valve

002-

Tab. 7.g

PH: Type of refrigerant

The type of refrigerant is essential for calculating the superheat value. In addition, it is used to calculate the evaporation and condensing temperature based on the pressure probe reading. The following table shows the refrigerants that are allowed and corresponding compatibility with the CAREL E

V valve. In this case, the value must be set for CO2, i.e.

PH=11.

Par. Description Def Min Max

PH Type of refrigerant

3025

0 = Custom gas 13 = R1270 1 = R22 14 = R417A 2 = R134a 15= R422D 3 = R404A 16= R413A 4 = R407C 17= R422A 5 = R410A 18= R423A 6 = R507A 19= R407A 7 = R290 20= R427A 8 = R600 21= R245Fa 9 = R600a 22= R407F 10 = R717 23 = R32 11 = R744 24 = HTR01 12 = R728 25 = HTR02

Tab. 7.h

Note: the NTC L243/PTC/PT1000 probes can only be conﬁ gured on

the full optional models or with EEV driver.

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

In: Type of unit

This parameter In assigns the function of Master or Slave to the controller. Hecu CO2 only accepts MPXPRO master controllers, therefore this parameter must always be set to “1”.

Par. Description Def Min Max UOM

In Type of unit: 0 = Slave; 1 = Master 0 0 1 -

Tab. 7.a

Sn: Number of slaves in the local network

This parameter tells the Master controller how many Slave controllers it needs to manage in the local network. Hecu CO2 only accepts MPXPRO master controllers, therefore this parameter must always be set to “0”.

Par. Description Def Min Max UOM

Sn Number of slaves in the local network

005-

0 = no Slaves

Tab. 7.b

7.2 Ultracell con guration (SW version ≥ 2.0)

General connection diagram

H0: Serial or Master Slave network address

Parameter H0 indicates the MPXPRO serial address.

Par. Description Def Min Max UOM

H0 Serial or Master Slave network address 199 0 199 -

Tab. 7.i

The addresses must obey the following logic:

Device Address

MPXPRO 1 11 MPXPRO 2 12 MPXPRO 3 13 MPXPRO 4 14 MPXPRO 5 15

End of procedure

Press Prg/mute for 5 s to exit the guided commissioning procedure.

Supervisor RS485

Shield

Rx/Tx+

Rx/Tx-

GND

48 47 46 45 44 43

FieldBus

49 50 51 52 53 54

Rx/Tx+

Rx/Tx-

GND

Rx/Tx+

Rx/Tx-

GND

UltraCella Control

R5 - R6

250 V

12 (10) A 12 A res. 2HP 12FLA 72 LRA

R3 - R4

10 A res. 5 (3) A 10 A res. 5FLA 18 LRA

R1 - R2

8 (4) A N.O. 8 A res. 2FLA 12 LRA

EN60730-1 UL 873

BMS

CAREL ExV

bianco/white

31 32 33

34 35 36

GND

37 38 39

40 41 42

24 Vac

GND

5 VREF

+ Vdc

DI1

DI2

DI3

230 V 20 A max

DI1

DEF

FAN

LIGHT

CAREL NTC, PT1000 CAREL NTC, PT1000 CAREL NTC, PT1000

analog output (0 to 10 Vdc, PWM)

CAREL NTC, analog input 0 to 10 Vdc

OUT

0 to 5 Vdc

(**)

Door switch

B5 analog input

(4 to 20 mA)

25 VA

ratiometric pressure transducer

NTC

verde/green

marrone/brown

24 Vac

2 AT

1324

VBAT

EVD Module cod. WM00ENNI00

DI1

GND

VREF

DI2

shield

COMA

GND Tx/Rx

giallo/yellow

NOA

Fig. 7.b

Once the wiring has been completed, simply follow the wizard that is displayed when the Ultracella devices are switched on for the ﬁ rst time. Details of this procedure are shown below; for further information see the UltraCella manual +0300083EN.

Important: in order to conﬁ gure the entire system, ﬁ rst check that the cold rooms are equipped with UltraCella controllers and the corresponding EEV electronic expansion valve module.

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

Commissioning with UltraCella Service terminal

H E L

Multifunction menu

PRG

ESC

UltraCella Service terminal

UltraCella

with LED display

Fig. 7.c

If the UltraCella controller has never been conﬁ gured, as soon as the terminal is connected, the wizard is shown automatically. The Wizard menu can also be accessed to repeat the guided commissioning procedure.

121

Fig. 7.d

Remove the bottom faceplate and connect the UltraCella Service Terminal to the controller.

M E N U

SET

HACCP

H E L P

Parameters Modification

PRG

Password: 1234

ESC

M E N U

SET

Fig. 7.g

2. To enter Programming mode: press Prg and enter the password: 1234

E L

Parameters Categ. 1/16

1-Probes

PRG

2-Control 3-Compressor

ESC

M E N U

SET

Fig. 7.h

3. Press DOWN until reaching the "Wizard" menu

E L

Parameters Categ. 16/16

14-EVDice

PRG

15-Three-phases 16-Wizard

ESC

M E N U

SET

Fig. 7.i

4. Conﬁ rm by pressing Set

Initial con guration

When starting for the ﬁ rst time, once the Service Tool is connected, the wizard is shown automatically. Select the desired language and then answer the questions to set the other parameters.

E L

Wizard

Language: English

PRG

Up/Down: Choose language Prg/Set: 1st question

ESC

M E N U

SET

Fig. 7.e

Repeated commissioning procedure

The commissioning procedure can be repeated by accessing the Wizard menu.

H E L

03/12/13 Setpoint

17:52:30 0.0 °C

PRG

OFF

ESC

Fig. 7.f

1.Switch the controller OFF (press DOWN and select the On/Oﬀ icon; press Set twice and then UP to switch the controller OFF; press Esc twice to exit)

M E N U

SET

E L

Wizard

Do you want to use the Wizard to configure

PRG

the cold room ?

YES

ESC

M E N U

SET

Fig. 7.j

5. Press Up and Set to enter the guided commissioning procedure.

Commissioning: main functions

Table of commissioning parameters

Par Description Cat. Def Min Max UOM

St Set point CtL 0 r1 r2 °C/°F rd Diﬀ erential CtL 2.0 0.1 20 °C/°F /P Type B1…B3 Pro 0 0 2 /A2 B2 conﬁ guration Pro 1 0 3 /A3 B3 conﬁ guration Pro 0 0 5 /P4 Type B4 Pro 0 0 2 /A4 B4 conﬁ guration Pro 0 0 4 /P5 Type B5 Pro 0 0 1 /A5 B5 conﬁ guration Pro 0 0 5 A5 Digital input 2

conﬁ guration (DI2)

A9 Digital input 3

conﬁ guration (DI3) d0 Type of defrost dEF 0 0 3 dt1 End defrost temperature, main

evaporator dP1 Maximum defrost duration dEF 30 1 250 min dd Dripping time after defrosting dEF 2 0 30 min Fd Post dripping time Fan 1 0 30 min F3 Evaporator fans during defrost

0/1=on/oﬀ c12 Compressor safety time, door switch

0 = door management disabled d8d Compressor restart time, door switch doL 30 c12 240 min

ALM 0 0 15 -

dEF 4.0 -50.0 200.0 °C/°F

Fan 1 0 1 -

doL 5 0 5 min

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

Par Description Cat. Def Min Max UOM

A3 Disable door switch

0=enabled

1=disabled tLi Light oﬀ delay doL 120 0 240 min A4 Light management

0 = door switch + light button

1 = light button

doL 1 0 1 -

doL 0 0 1 -

Tab. 7.j

H0: Serial address

Parameter H0 indicates the UltraCella serial address.

Par. Description Def Min Max UOM

H0 Serial address 199 0 199 -

Tab. 7.k

The addresses must obey the following logic:

Device Address

UltraCella 1 11 UltraCella 2 12 UltraCella 3 13 UltraCella 4 14 UltraCella 5 15

While the other parameters that select the protocol are:

• H7 = 0 Carel protocol

• H7 = 1 Modbus protocol

H7 must be = 1, while the other parameters retain the default settings, and are:

Par. Description Def Min Max UOM

H10 BMS baud rate bit/s

0 1200 5 38400 1 2400 6 57600 2 4800 7 76800 3 9600 8 115200 4 19200 9 375000

H11 Number of BMS stop bits

1 1 stop bit 2 2 stop bit

H12 BMS parity

0 none 1 odd 2even

Note: To make the change active, the unit must be switched oﬀ and

on again.

40 9 -

21 2 -

00 2 -

The parameter settings are listed below.

Par. Description Def Min Max UOM

/P Type B1…B3

0 = NTC Standard Range -50T90°C 1 = NTC Enhanced Range 0T150°C 2 = PT1000

/P4 Type B4

0 = NTC Standard Range -50T90°C 1 = NTC Enhanced Range 0T150°C 2 = 0 to 10 V

/P5 Type B5

0 = 4 to 20 mA 1 = 0 to 5 Vrat 2= 0.5 to 4.5 Vrat

002-

Assign functions of probes B1, B2, B3, B4, B5

Inside the cold room, the controller can use the following probes:

• outlet:

• intake;

• defrost, placed on the evaporator, preferably where ice remains the

longest;

Probe B1 is conﬁ gured as an ambient temperature probe and its function cannot be changed.

Par. Description Def Min Max UOM

/A2 B2 conﬁ guration

0 Absent 1 Defrost probe 1 (Sd1) 2 Intake probe (Sr) 3 Generic temperature probe 2

/A3 B3 conﬁ guration

0 Absent 1 Defrost probe 2 (Sd2) 2 Cond. probe (Sc) 3 Defrost probe 1 (Sd1) 4 Ambient probe (SA) 5 Generic temperature probe 3

/A4 B4 conﬁ guration

0 Absent 1 Ambient temperature probe (SA) 2 Humidity probe 3 Generic temperature probe 4 4 Generic humidity probe 4

/A5 B5 conﬁ guration

0 Absent 1 Humidity probe 2 Generic temperature probe 5 3 Generic humidity probe 5 4 Generic pressure probe 5 5 Condensing pressure probe (Scp)

103-

005-

004-

005-

Cold room temperature control

Cold room temperature is managed by modulating the electronic expansion valve.

Probe con guration

The UltraCella controllers have a maximum of ﬁ ve analogue inputs, three of which can be conﬁ gured as temperature probes (NTC probes, high temperature NTC probes, PT1000), the fourth as a temperature probe or 0-10 V input, the ﬁ fth can be conﬁ gured as a 4-20 mA or 0-5 Vrat input.

Analogue inputs Type

B1 B2 B3 B4 NTC10 kΩ at 25°C, range -50T90°C,

B5 4 to 20 mA

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

NTC10 kΩ at 25°C, range -50T90°C, NTC extended range, NTC50 kΩ at 25°C, range 0T150°C; PT1000, 1000 Ω at 0°C, range -50T90°C

NTC extended range, NTC50 kΩ at 25°C, range 0T150°C 0 to 10 V

0 to 5 Vrat

0.5 to 4.5 Vrat

Tab. 7.l

For probe B4, if conﬁ gured as a 0 to 10 V input (/P4 = 2) and for probe B5, the logical values to be used by the controller corresponding to the physical full scale readings can be assigned.

Par. Description Def Min Max UOM

Minimum value of probe 4 (0 to 10 V input

/4L

only)

/4H Maximum value of probe 4 (0 to 10 V input

only) /5L Minimum value of probe 5 0 -50.0 /5H /5H Maximum value of probe 5 100.0 /5L 999 -

0 -50.0 /4H -

100.0 /4L 200.0 -

Example: if a pressure sensor with 4 to 20 mA output is connected to input B5 with the range -1 to 9.3 bars, set

- /5L = -1,0

- /5H = 9,3 In this case, when the probe reads 12 mA, the value associated with the reading of B5 will be 4.1 (mid scale).

ENG

Probe reading correction

The values read by the probes can be corrected by adding or subtracting an oﬀ set from the measurement, set by parameters /c1 to /c5.

Par. Description Def Min Max UOM

/c1 B1 oﬀ set 0 -20.0 20.0 °C/°F /c2 B2 oﬀ set 0 -20.0 20.0 °C/°F /c3 B3 oﬀ set 0 -20.0 20.0 °C/°F /c4 B4 oﬀ set 0 -20.0 20.0 °C/°F/

rH%

/c5 B5 oﬀ set 0 -20.0 20.0 °C/°F/

rH%/

bar/

psi

The oﬀ set may be subject to HACCP requirements. In this case, the oﬀ set should be calculated using a calibrated instrument. Changing these parameters that aﬀ ect the values measured and displayed may not be permitted. If in doubt, check with the food safety manager or the site manager.

min max

Fig. 7.k

Key

T1 Temperature read by the probe T2 Temperature read by the probe after correction with the oﬀ set AOﬀ set value min, max Field of measurement

HACCP - IMPORTANT

Modifying the parameters that aﬀ ect temperature measurement and display may not be allowed in certain applications or may require speciﬁ c authorisation due to HACCP system requirements. If in doubt, check with the food safety manager or the site manager.

Function of digital inputs DI1, DI2 and DI3

PARAMETERS A11, A5, A9

Selection Contacts

0 = Not active - 1 = immediate external alarm active not active 2 = Do not select - 3 = enable defrost not enabled enabled 4 = start defrost not active active

Door switch active not active

5 = 6 = Remote ON/OFF OFF ON

7 = Change set point (r4-r5) from switch

8 = low pressure switch low pressure status normal status 9 = Do not select - 10 = Do not select - 11 = Do not select - 12 = AUX output activation deactivated activated 13 = Do not select - 14 = continuous cycle activation Open contact (deac-

15 = alarm from generic function (DI2 and DI3 only) 16 = start/stop defrost stop start 17 = serious alarm active not active

OPEN

not active active

tivation)

active/not active active/not active

CLOSED

Closed contact

(activation)

Tab. 7.m

The parameter settings for A5 and A9 are described below.

1 = Immediate external alarm

Application: external alarm that requires immediate activation (for

example, high pressure alarm or compressor thermal overload). Activation of the alarm:

1. • shows the message on the display ('IA');

• activates the buzzer, if enabled;

• activates the alarm relay, if selected;

2. involves the following actions on the actuators:

• fans: continue to operate according to the fan parameters ("F").

Note: if more than one input is conﬁ gured as an immediate alarm, the alarm is generated when one of the inputs opens.

Digital inputs

Note: digital input 1 (DI1) is used for the door switch by default,

however this can be conﬁ gured for DI2 and DI3 If the door switch is not used (for example, connected to DI1), it can be disabled by setting A3=1 and A11=5 (default value) or another function can be associated with DI1, see Table 4b.

Par. Description Def Min Max UOM

A3 Disable door switch

0= enabled 1= disabled

If A3=0 and the door switch is not connected, the controller will activate the "door open" icon. To prevent incorrect messages being displayed, set A3=1 or short-circuit pin 21 (DI1) to one of the GND pins. Multiple contacts can be connected to the multifunction digital inputs to activate diﬀ erent types of functions, such as alarm, start/stop defrost, low pressure switch, etc.

Important: to guarantee the safety of the unit in the event of

serious alarms, all the electromechanical safety devices necessary to ensure correct operation must be provided on the unit itself.

101-

2 = Do not select 3 = Enable defrost

Application: any defrost request received when the contact is open will

remain pending until the contact closes.

A11/A5/A9 = 3

Contact Defrost

Open Not enabled Closed Enabled (defrost start is still determined by the controller) Closed with active defrost

When the digital input is opened, the defrost is immediately stopped and the unit restarts normal operation (without performing the dripping or post-dripping phases). The LED starts ﬂ ashing to indicate that the defrost request is pending, waiting for the next enabling signal (closing of the contact), when the defrost will be performed completely.

Tab. 7.n

Note: this function may be useful to prevent defrosts on units exposed to the public during store opening hours.

4 = Start defrost from external contact

Application: this function is useful for carrying out synchronised defrosts

on several units, or manual defrosts controlled by an external contact. To do this, simply connect a mechanical or electronic timer to the selected digital input. Several units can be connected to the same timer, setting diﬀ erent values for parameter d5 (defrost delay from multifunction input) to avoid simultaneous defrosts.

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

Timer

OFF

Defrost

OFF

Defrost

OFF

Defrost

OFF

dP(1)

d5(2)

dP(2) dP(3)

d5(3)

Fig. 7.l

Key

dP Maximum defrost duration UNIT 1…3 Unit 1…3 d5 Defrost delay from digital input t Time

5 = door switch (see parameter A3)

6 = remote On/O

The digital input can also be programmed as a remote ON/OFF switch. When the controller is OFF:

• the temperature is displayed alternating with the message "OFF"; the

internal timer related to parameter dI is updated. If dI expires whe the unit is OFF, the controller runs a defrost when restarting;

• the auxiliary relays set as AUX and light remain active, while the other

auxiliary outputs are deactivated;

• the buzzer and alarm relay are deactivated;

• the controller does not perform any control actions, defrost, continuous

cycle, temperature alarms or any other functions.

When the controller restarts, all of the functions are reactivated, except for:

• defrost on start-up;

• fan delay on start-up.

Note: ON/OFF from external digital input has priority over the keypad and supervisor input.

7, 8, 9, 10, 11 = Do not select

UNIT 1

UNIT 2

UNIT 3

Application: an external device is used to start the defrost (on closing the digital input) and subsequently stop it (on opening the digital input). When the digital input opens, the dripping time set for parameter dd must then elapse.

Note:

• if following the start of the defrost, the digital input does not open

before the time dP1 elapses, the defrost will terminate by time and alarm Ed1 will be displayed (defrost ended by timeout.

• opening the digital input does not start the defrost only if the

defrost probe (e.g. B2) temperature is greater than dt1 (end defrost temperature on main evaporator).

• if a separate defrost is conﬁ gured on two evaporators (d13=1) and

start/stop defrost from external contact is set, both evaporators are defrosted at the same time.

17 = serious alarm

Application: external alarm that causes the immediate deactivation of the outputs on UltraCella (except those conﬁ gured as a light/alarm) so as to prevent a dangerous situation. This can be used, for example, to stop the compressor following activation of an external protection device. Activation of the alarm causes:

• shows the message on the display (‘SA');

• activates the buzzer, if enabled;

• activates the alarm relay, if selected;

Involves the following actions on the actuators:

• immediate deactivation of all the outputs (relays), except for those

conﬁ gured as lights and/or alarms.

Note: if more than one digital input is conﬁ gured as a serious alarm, the alarm is generated when one of the inputs opens.

Type of defrost

UltraCella can manage the following types of defrost, depending on the setting of parameter d0:

0. heater by temperature;

1. hot gas by temperature;

2. heater by time:

3. hot gas by time.

For further explanations, see chap. 6.

Par. Description Def Min Max UOM

d0 Type of defrost

0 Heater by temperature 1 Hot gas by temperature 2 Heater by time 3 Hot gas by time

dt1 End defrost temperature, main evaporator 4.0 -50.0 200.0 °C/°F dP1 Maximum defrost duration 30 1 250 min

003-

12 = Auxiliary output

By setting H1/H5 = 2, the corresponding output, AUX1/AUX2, is activated by the AUX1/AUX2 button or by the digital input, if conﬁ gured. In addition, a digital input DI1, DI2 or DI3 (set A11, A5 or A9 = 12) can be used to control AUX1 or AUX2. In this case, the button and the digital input have the same priority for activation.

13 = Do not select

14 = Continuous cycle activation

Activation: contact switches from open to closed; Deactivation: contact switches from closed to open.

15 = Alarm from generic function

Digital inputs DI2 and DI3 can be associated with speciﬁ c alarms using the generic functions, and can be active when the input is open or closed (see the paragraph on Generic functions).

16 = start/stop defrost from external contact

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

Evaporator fans

During the dripping time (parameter dd > 0) and post dripping time (parameter Fd > 0), the evaporator fans are always oﬀ . This is useful to allow the evaporator to return to normal temperature after defrosting. The evaporator fans can be forced on during control (parameter F2) and during defrosts (parameter F3). See chap. 6.

Par. Description Def Min Max UOM

dd Dripping time after defrost (fans oﬀ ) 2 0 30 min F2 Evaporator fans with compressor oﬀ 30060 F3 Evaporator fans during defrost 0/1 = on/oﬀ 101Fd Post dripping time (fans oﬀ ) 1 0 30 min

Light management

The light can be managed:

• by the door switch (if A3 = 0) and/or light button;

• only by the light button.

ENG

The parameters involved are shown below.

Par. Description Def Min Max UOM

tLi Light on with door open 120 0 240 min A4 Light management

0 Door switch + light button 1 Light button

001-

Note: if the controller is OFF, the light output is controlled only by

the light button. If the controller is ON, the light is controlled by door switch + light button or light button only, according to the setting of parameter A4.

Door switch + light button

If A4 = 1, the light is switched on/oﬀ only by the light button. The door status, open or closed, is ignored. If A4 = 0, when the cold room door is open, the light is always on. When the door is closed, the light can be switched on or oﬀ using the light button. Once on, the light will automatically switch oﬀ after the time set for Li.

LIGHT MANAGEMENT BY DOOR SWITCH AND LIGHT BUTTON

Light_K

OFF

Door_sw

OFF

tLi tLi

A4=0

Fig. 7.m

Key

Light_k Light button Li Light Door_sw Door switch tLi Light oﬀ delay t time

7.3 Ultra EVD EVO module commissioning

EVD EVO driver con guration from UltraCella

Connect UltraCella to the EVD module via serial, as shown in the wiring diagram in Figure 7.c, and refer to the following parameter table for conﬁ guration of the EVD EVO driver. The module will become active when enabled by UltraCella, setting P1 = 1. If connected via serial, the driver parameters can be displayed only (not modiﬁ ed) by the local EVD EVO display. Once the driver has been enabled (parameter P1=1), its parameter settings will be sent by UltraCella, in accordance with the parameter table below (only modiﬁ able from UltraCella); any parameters previously conﬁ gured on the EVD EVO display will be overwritten.

EVD EVO parameter table

The following parameters relating to the EVD EVO driver can be conﬁ gured from UltraCella Category: EVO

Par. Description Def Min Max UOM

P1 Enable communication with EVD EVO mod-

ule 0/1=disabled/enabled

P1t Type of probe S1

0 0-5 V rat. 2 4-20 mA remote 1 4-20 mA 3 4-20 mA ex ternal

P1M Maximum value of probe S1 12.8 -20 200 bar/psi P1n Minimum value of probe S1 -1 -20 200 bar/psi PVt Typeof valve

1 Carel exv

PH Type of refrigerant

1 R744

PrE Type of main control

1 cabinet/cold room with remote rack 2 cabinet/cold room with on-board

comp. 3 perturbed cabinet/cold room 4 subcritical CO

P0 EVD Modbus address 198 1 247 P3 Superheat set point 10 -72 324 K P4 Proportional gain 15 0 800 P5 Integral time 150 0 999 sec P6 Derivative time 2 0 800 sec P7 LowSH: low superheat threshold 3 -72 324 K P8 LowSH: integral time 600 0 800 sec P9 LowSH: low superheat alarm delay 600 0 999 sec PL1 LOP: low evap. temperature threshold -50 -60 200 °C/°F PL2 LOP: integral time 600 0 800 sec PL3 LOP: low evaporation temperature alarm

delay PM1 MOP: max evap. pressure threshold 50 -60 200 °C/°F PM2 MOP: integral time 600 0 800 sec PM3 MOP: max evap. pressure alarm delay 10 0 999 sec cP1 Initial valve position when control starts

(percentage) Pdd Post defrost delay (single driver only) 10 0 60 min PSb Valve position in standby 0 0 100 steps PMP Enable manual positioning 0 0 1 PMu Manual valve position 0 0 999 steps Pnr Reset EVD setting 0 -> 1 Reset all EVD EVO

parameters PLt Stop smooth lines oﬀ set 2.0 0.0 10.0 °C/°F PHS Maximum smooth lines oﬀ set 15.0 0.0 50.0 °C/°F PSP Smooth lines proportional coeﬃ cient 5.0 0.0 100.0 °C/°F PSI Smooth lines integral time 120 0 1200 s PSd Smooth lines derivative time 0 0 100 s PSM Enable smooth lines (0=NO - 1=YES) 0 0 1 /

cabinet/cold room

001 -

003 -

1 1 22 -

3 1 40 -

214 -

600 0 999 sec

50 0 100 %

001 -

Note: set parameters P1=1, P1M and P1n with the values of the connected probe, PrE=1, PH=11 (R744)

Par. Description Def Min Max UOM

Enable communication with EVD EVO module 1 = EVD module enabled

101-

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

7.4 Connecting MPXPRO/Ultracella controllers to Hecu

Once having completed the conﬁ guration of the MPXPRO/UltraCella controllers, the serial network needs to be connected, as shown in the following diagram:

Supervisory system

RX-/TX-

RX+/TX+

GND

Vout

RX-/TX-

RX+/TX+

GND

OFF

J11

J10

J12

J14

J13

J2J3J4J5J6J8J7

Fieldbus - Modbus® RS485

J16

J17

J18

J19

J20

C1 C2

L1/LL2/N L3 U V W

12345 678910

J21

J22

J23

J24

RPRV valve

To subsequently conﬁ gure the entire system made up of the Hecu CO2 and MPXPRO/UltraCella controllers, see the Fast Commissioning procedure described in detail below.

Fast commissioning

Go to screen Eb00 to start the AutoSetup procedure for the UltraCella/MPXPRO controllers connected to HECU. At the end of the procedure, screen Eb02 is displayed.

MPXPRO

High voltage

master

AUX

Fig. 7.n

C1 C2

L1/LL2/N L3 U V W

12345 678910

max 5 units

MPXPRO

High voltage

master

AUX

EVDEVO EVDEVOmaster

Par. Description Def

tON tOFF Mode Fixing time

Washing cycle duration Time between two washing cycles Sequential or together Stabilisation time after washing

180sec 180min One cabinet at a time 120sec

Tab. 7.o

• Evaporator control parameters: the default values enable the Smooth

Lines evaporator control function and involve the main control parameters for the evaporators, in screens Ecxx. The main values are shown in the following table:

Par. Description Def

P3 Superheat set point 10 P4 Valve control: Proportional gain 8 P5 Valve control: Integral time 400 P6 Valve control: Derivative time 0 P7 Low superheat threshold 3 PSM Enable Smooth Lines Enable Plt Oﬀ set to stop control below set point (Smooth Lines) 4 Phs Maximum superheat oﬀ set (Smooth Lines) 9 PSP Smooth Lines: Proportional gain 3.0 PSI Smooth Lines: Integral time 360.0 PSD Smooth Lines: Derivative time 0.0

Note: all of the values indicated as defaults by the Fast Commissioning procedure can be modiﬁ ed to optimise overall system operation. It is recommended to change one parameter at a time and then evaluate the eﬀ ects for at least 10 minutes.

Tab. 7.p

Then on screen Eb03, the capacities can be set for each evaporator, so as to maximise energy savings with the Floating Suction function

MPXPRO/UltraCella control

Once having connected the MPXPRO controllers to Hecu, the control parameters will be on screens Ec01-02-03-04 for the ﬁ rst evaporator.

The default parameters are then downloaded, so as to automatically conﬁ gure the following functions:

• Floating suction pressure set point (par. 6.3): the default values

enable compressor control with ﬂ oating set point on screen Cab01. The minimum and maximum set point values will be displayed automatically, in accordance with the type of refrigerant and application selected, together with the proportional gain and integral time values required by the controller and already shown in paragraph

6.3.

• Oil Recovery Washing (par. 6.6): the default values enable the

evaporator oil recovery washing function on screen Fab24. The following parameters manage this function:

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

Electronic valve control

The superheat control function calculates the valve position based on the current superheat reading and the set point. PID control (Proportional, Integral, Derivative) is the sum of three distinct actions:

Proportional action (P) parameter K=proportional gain: The proportional action opens or closes the valve by K steps when superheat increases or decreases by 1°C. Thus the greater the K the higher the response speed of the valve to variations in superheat. The proportional action is fundamental as it aﬀ ects the speed of the valve in general. However it only considers variations in superheat and not the variation in relation to the set point. If superheat does not vary signiﬁ cantly, the valve will remain stable and the superheat set point may not be reached.

Integral action (I) parameter Ti=integral time (sec): The integral action is linked to time and moves the valve in proportion to the deviation of the superheat value from the set point. The greater the deviations, the more intense the integral action; in addition, the lower the value of the integral time (Ti), the more intense the action will be. The integral action is necessary to ensure that superheat reaches the set point.

Derivative action (I) parameter Td=derivative time (sec): The derivative action is linked to the speed of variation of the superheat value, that is, the gradient at which superheat changes from instant to instant. It tends to react to any sudden variations, and has greater eﬀ ect the higher the values of Td.

Smooth Lines function

The smooth lines function optimises evaporator capacity based on actual cooling demand, allowing more eﬀ ective and stable control of the showcase. This function completely eliminates traditional on/oﬀ control cycles, modulating the temperature exclusively using the electronic valve; superheat set point is controlled through a precise PI control algorithm based on the actual control temperature. The main features are:

• The superheat set point for managing the electronic expansion valve

can vary between a minimum (traditional set point P3) and maximum limit (P3 + PHS: max. oﬀ set) using PI control (pre-conﬁ gured), based on the controller temperature and how far this is from the corresponding set point St

• The temperature inside the cabinet/showcase can fall slightly below

the set point St, without stopping the main control, however simply closing the electronic valve

• Temperature control (and consequently the solenoid valve relay)

therefore remains active at all times, while the electronic expansion valve stops the ﬂ ow of refrigerant into the evaporator

• It is easy to use, as it is the controller itself that automatically adapts

control based on current operation, without requiring special parameter settings

The main eﬀ ects are:

• No swings in temperature and superheat due to the set point being

reached

• Stable temperature and superheat control

• Maximum energy savings due to load stabilisation

Selecting the superheat set point and control parameters

The superheat set point needs to be deﬁ ned based on the design speciﬁ cations of the controlled unit. Despite this, based on actual system conditions, this may be changed at any time. A low set point ensures better evaporator eﬃ ciency and a low air temperature can be reached more easily. In contrast, instability can be created in the system, with greater variations in superheat and liquid returning to the compressor.

A high set point ensures high system stability and lower variations in superheat. However evaporator eﬃ ciency is penalised and the air temperature set point may not be reached.

As regards the control parameters, the following can be used as a guide:

Proportional gain (from 3 to 30)

Increasing the proportional gain K increases valve response speed and is recommended if the system is particularly perturbed or to make superheat control faster. If greater than 20, it may cause swings and instability.

Integral time (from 40 to 400 sec)

Increasing the integral time Ti improves stability but makes the valve slower to respond in reaching the set point. If less than 40 sec, it may cause swings and instability. If the system is already perturbed, high values (greater than 150 sec) are recommended to avoid creating further disturbance.

Derivative time (from 0 to 10 sec)

Increasing the derivative time Td improves valve response, in particular in perturbed systems, and reduced the amplitude of swings in superheat. If greater than 10 sec it may cause excessively fast response and consequently instability.

Max

SH set

Min

Temp. set

Fig. 7.o

Par Description Def Min Max UoM

PSM Smooth Lines - enable function 0 0 1 PLt Smooth Lines - oﬀ set to stop control below

set point

PHS Smooth Lines - max superheat oﬀ set 15.0 0.0 50.0 K

2.0 0.0 10.0 °C/°F

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

LowSH Low superheat protection.

To prevent too low superheat values that may cause the return of liquid to the compressor or system instability (swings), a low superheat threshold can be deﬁ ned, below which a special protection function is activated. When the superheat falls below the threshold, the system immediately enters low superheat status and activates an integral control action, which added to normal control is aimed at closing the electronic valve more quickly. In practice, the intensity of the system’s “reaction” is increased. If the device remains in low superheat status for a certain period, a low superheat alarm is activated, with the display showing the message ‘LSH’, if enabled. The low superheat signal features automatic reset, when the condition is no longer present or the controller is switched oﬀ (standby). When low superheat status is activated, any local solenoid valves can be forced closed (parameter P10).

Par. Description Def Min Max UOM

P7 LowSH: low superheat threshold 7.0 -10.0 P3 K P8 LowSH: integral time

0 = function disabled

P9 LowSH: alarm delay

0 = alarm disabled

15.0 0.0 240.0 s

600 0 999 s

Tab. 7.c

LowSH

ALARM

OFF

Fig. 7.p

Key

SH Superheat P7

LowSH Low superheat protection P9 Alarm delay ALARM Alarm t time

LowSH protection threshold

Defrosting evaporators connected via serial line

The purpose of this function is to prevent the compressor from starting when one or more evaporators are defrosting. When the compressor stops (due to control, alarm, ...) if the "available" capacity is higher than the threshold (% of total capacity), the compressor can start normally, otherwise it stays oﬀ until the evaporators ﬁ nish defrosting or the suction pressure is higher than a settable safety threshold.

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

8. SIGNALS AND ALARMS

ENG

Hecu CO2 can manage both alarms relating to the status of the digital inputs and to system operation. For each alarm, the following are controlled:

• Actions on the devices, if necessary

• Output relays (one global and two with diﬀ erent priorities, if conﬁ gured)

• The red LED on the terminal and the buzzer, where featured

• The type of acknowledgement (automatic, manual, semi-automatic)

• Any activation delay

The complete list of alarms, with the related information as described above, is available in the Alarm table.

8.1 Alarm management

All alarms feature the following behaviour:

• When an alarm is activated, the red LED ﬂ ashes and the buzzer is

activated (where featured); the relay corresponding to the global alarm and any alarms with high priority is activated (if conﬁ gured)

• Pressing (Alarm), the red LED stays on steady, the buzzer is muted

and the alarm screen is shown

• If there is more than one active alarm, these can be scrolled using

(Down). This situation is signalled by an arrow at the bottom

(Up) right on the screen

• Press (Alarm) again for at least 3 seconds manually acknowledges

the alarms, which are cleared from the display unless others are active (they are saved in the log)

Log

The alarm log can be accessed:

• from branch H.a of the main menu

• by pressing (Alarm) and then (Enter) when there are no active

alarms

• by pressing (Enter). After having scrolled all of the alarms.

The alarm log screens show:

1. Order of activation (no. 01 is the oldest alarm)

2. Time and date the alarm was activated

3. Short description

4. Main values at the moment the alarm occurred (suction pressure and

condensing pressure)

Note: a maximum of 50 alarms can be logged; after this limit any

new events overwrite the oldest ones, which are therefore deleted.

8.2 Compressor alarms

The number of alarms can be chosen for each compressor, in the conﬁ guration phase (wizard) or subsequently in branch C.a.e of the main menu.

Priority

For certain alarms, the alarm output relays can be conﬁ gured according to two types of priority:

• R1: serious alarm

• R2: normal alarm

The corresponding relays, once conﬁ gured, are activated when an alarm with the corresponding priority occurs. For other alarms, priority is ﬁ xed and associated by default to one of the two relays.

Reset/acknowledgement

The alarms can be acknowledged manually, automatically or semiautomatically:

• Manual: the alarm is acknowledged by pressing (Alarm), twice,

the ﬁ rst time displays the corresponding alarm screen and mutes the buzzer, the second (extended, for at least 3 seconds) cancels the alarm (which is saved in the log). If the alarm is still active, it is not reset and the signal is shown again.

• Automatic: when the alarm condition ceases, the alarm is automatically

acknowledged, the LED comes on steady and the corresponding

screen remains displayed until alarm is saved in the log.

(Alarm) is pressed and held; the

• Semi-automatic: the alarm is acknowledged automatically, until

reaching a maximum number of activations in a set period. When the number reaches the maximum setting, the alarm then needs to be acknowledged manually.

Fig. 8.a

After having selected the number of alarms (maximum 2), each alarm can be assigned a description, choosing from the options shown in the table, output relay, type of reset, delay and priority. The eﬀ ect of the alarm on the devices is ﬁ xed and involves stopping the compressor, except for the oil warning.

Possible descriptions for compressor alarms

Reciprocating or scroll

Generic Overload High pressure Low pressure Oil

Tab. 8.a

A possible screen for choosing the description of the alarm is shown in the ﬁ gure:

For manual acknowledgement, the functions associated with the alarm will not be reactivated until the alarm is acknowledged , while for automatic acknowledgement, the functions are reactivated as soon as the alarm condition ceases.

After having selected the ‘generic’ description, no other description can be selected. In general, the descriptions are divided into 4 groups:

• generic

• others (overload, oil, high pressure, low pressure)

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

Tab. 8.b

ENG

After having selected a description pertaining to one group, no descriptions from other groups can be selected for that alarm. For example, the selection may be generic, or alternatively overload + oil. Each alarm will have its own unique alarm screen, and this will include all the descriptions associated with that alarm.

According to the number of alarms selected, the descriptions shown in the table will be associated by default.

Default descriptions based on the number of alarms

Number of alarms Descriptions

1 Generic 2 Overload

HP-LP

3 Overload

HP-LP Oil

4 Overload

HP LP Oil

Tab. 8.d

Note: an oil alarm can be interpreted as an oil level warning. When the alarm is activated, an attempt is made to restore the level for a set time before signalling the alarm and stopping the compressor. If a modulating device is used to drive the compressors, additional alarms are provided:

• compressor inverter warning, common for the entire suction line,

when using inverters

• oil crankcase temperature alarm, high discharge temperature.

Low superheat alarm

The low superheat alarm can also be enabled for parallel compressors, in addition to the standard SSH-DSH alarm. The alarm can be enabled and the settings made on the following screen:

8.3 Pressure alarms

Hecu CO2 can manage pressure alarms from a pressure switch or probe, according to the following diagram.

Alarms from pressure switch:

• Low suction pressure

• High condensing pressure

Alarms from probe:

• Low suction pressure

• High suction pressure

• Low condensing pressure

• High condensing pressure

One possible example for the low pressure alarms is shown in the ﬁ gure:

Dierential

Probe alarmPressostat alarm

Fig. 8.b

Pressure alarms from pressure switch

The parameters corresponding to these alarms can be set in branch G.c.a/G.c.b of the main menu.

Low suction pressure from pressure switch

The low suction pressure alarm from pressure switch has the eﬀ ect of stopping all the compressors without observing the various times, therefore when the digital input conﬁ gured as the low pressure switch is activated, all the compressors on the line aﬀ ected are stopped immediately. This alarm features semi-automatic reset, and both the monitoring time and the number of activations in the speciﬁ ed period can be set. If the number of activations is higher, reset becomes manual. In addition, the delay after which the alarm is activated on both start-up and during operation can be set. The delay at start-up only applies to unit start-up and not compressor power-on.

Pressure

The alarm threshold is the same as the one used for the SSH_DSH alarm.

High condensing pressure from pressure switch

The high condensing pressure alarm from pressure switch has the eﬀ ect of stopping all the compressors without observing the various times and forcing the fans on at maximum speed, therefore when the digital input conﬁ gured as the high pressure switch is activated, all the compressors on the line aﬀ ected are stopped immediately and the fans operate at maximum output. This alarm features manual or automatic reset, as conﬁ gured by the user. The delay after which the alarm is activated can also be set.

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

Pressure alarms from probe

The parameters corresponding to these alarms can be set in branch C.a.e of the main menu for suction pressure, and D.a.e for condensing pressure.

For these types of alarms, reset is automatic and the activation threshold and diﬀ erential can be set, as well as the type of threshold, which may be absolute or relative to the control set point. The ﬁ gure shows an example of setting the threshold to relative.

Dierential

Relative threshold

AlarmSetpoint

Fig. 8.c

Note: for temperature control, the alarms from probe are managed based on temperature even when pressure probes are ﬁ tted.

The eﬀ ects of the diﬀ erent pressure alarms from probe are described below.

Low suction pressure from probe

The low suction pressure alarm from probe has the eﬀ ect of stopping all the compressors without observing the times.

High suction pressure from probe

The high suction pressure alarm from probe has the eﬀ ect of forcing all the compressors on, ignoring the control times, but observing the compressor protection times.

Pressure

8.5 High pressure prevention

Hecu CO2 can manage the high discharge pressure prevention actions, involving:

• overriding the compressors and fans

Prevent by overriding the compressor and fans

The parameters corresponding to this function can be set in branch G.c.a/G.c.b of the main menu.

The eﬀ ect of this type of prevention action is to force on all the fans at maximum speed and the BLDC compressor on at minimum speed.

An activation threshold can be set, which is always absolute, as well as the deactivation diﬀ erential.

Furthermore, the evaluation time and number of activations allowed in a deﬁ ned time period can also be set. If the number of activations is higher than set, reset becomes manual.

Pressure

HP by pressostat

HP by probe

Prevent

dierential

Low condensing pressure from probe

The low condensing pressure alarm from probe has the eﬀ ect of stopping all the fans without observing the times.

High condensing pressure from probe

The high condensing pressure alarm from probe has the eﬀ ect of forcing all the fans on and stopping all the compressors, ignoring the times.

8.4 Anti liquid return MPX valve alarm

For alarms that stop the compressor, if the “anti liquid return MPX valve” function is enabled, the evaporator valves will be forced closed. This function can be enabled on screen Cag65.

In the event of a low pressure switch alarm, the valves will not be forced closed, so as to allow the system to restart.

Below is the list of alarms that stop the compressor and close the valve:

• High pressure

• HP prevent lock (5 attempts)

• Low SH

• High receiver pressure

• SSH-DSH

• High or low oil level

• Leak alarm

• CO2 alarm

time

Fig. 8.d

8.6 MPXPRO/UltraCella alarms

The MPXPRO and/or UltraCella alarms are sent remote to the Hecu CO2 user interface, which also forwards them to the supervisor for management/logging.

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

8.7 Alarm table

Screen index

ALU02 Control probe absent At least one of the main probes is not conﬁ gured

ALA01 Discharge temperature probe broken

ALA02 Gas cooler pressure probe broken

ALA03 Outside temperature probe broken

ALA04 Generic probe A on board 1 broken

ALA05 Generic probe B on board 1 broken

ALA06 Generic probe C on board 1 broken

ALA07 Generic probe D on board 1 broken

ALA08 Generic probe E on board 1 broken

Display Description Serious

correctly: P_suc, P_GC, T_out_GC, P_ric

or disconnected

Compressor discharge temperature probe faulty or not conﬁ gured correctly

Gas cooler pressure probe faulty or not conﬁ gured correctly Outside gas cooler temperature probe faulty or not conﬁ gured correctly

Generic probe A faulty or not conﬁ gured correctly

Generic probe B faulty or not conﬁ gured correctly

Generic probe C faulty or not conﬁ gured correctly

Generic probe D faulty or not conﬁ gured correctly

Generic probe E faulty or not conﬁ gured correctly

alarm

Alarm Delay Reset

x Not present Auto

ALA24 Suction pressure probe broken

or disconnected

ALA25 Suction temperature probe broken

or disconnected

ALA43 Gas cooler out temp.probe broken Gas cooler outlet temperature probe faulty

ALA44 Receiver pressure probe broken

or disconnected

ALA46 Vapour injection pressure probe

broken or disconnected

ALA47 Vapour injection temperature probe

broken or disconnected

ALA55 Parallel line suction pressure probe

broken or disconnected

ALA 56 Parallel line suction temperature

probe broken or disconnected

ALA57 LT line discharge pressure probe

broken or disconnected

ALA58 Parallel line discharge temperature

probe broken or disconnected

ALB01 Common low pressure switch alarm Low pressure switch on the suction line trips below the

ALB02 Common high condensing pressure

switch alarm

ALB03 Low condensing pressure alarm P_GC falls below a threshold set on De07 x De03 Auto

ALB04 High condensing pressure alarm P_GC exceeds a threshold set on De06 x De01 Auto

Compressor suction pressure probe faulty or not conﬁ gured correctly Compressor suction temperature probe faulty or not conﬁ gured correctly

or not conﬁ gured correctly Receiver pressure probe faulty or not conﬁ gured correctly

Vapour injection pressure probe faulty or not conﬁ gured correctly (LT only) Vapour injection temperature probe faulty or not conﬁ gured correctly (LT only) Parallel compressor suction pressure probe faulty or not conﬁ gured correctly Parallel compressor suction temperature probe faulty or not conﬁ gured correctly LT compressor discharge pressure probe faulty or not conﬁ gured correctly Parallel compressor discharge temperature probe faulty or not conﬁ gured correctly

threshold (number of automatic resets / in min.) High pressure switch on the condensing line trips above the threshold

x Not present Auto

x Hc02 Hc03

x Hc01 Auto/manual

ALB05 Liquid level alarm Low liquid level alarm from DI with consequent low

ALB06 Common oil diﬀ erential alarm Low oil level in receiver alarm

ALB07 Fan common overload Fan overload alarm from DI x De05 Auto/manual

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

pressure inside the receiver

from DI Open solenoid valve installed between oil separator and receiver to increase oil level

x Hc04 Auto

Action Troubleshooting

Unit switched oﬀ Check control probes *

ENG

No control action Corresponding functions disabled:

- T_dis control by Hb02

- speed control based onT_dis by Hb03 No control action The HPV valve is set to a safety percentage on Fhb13 Corresponding functions disabled:

- control switches to T_out in case of P_GC fault on Dg14

- gas cooler speed up on T_out on Dg13 Corresponding functions disabled

- if probe A is faulty or not correctly conﬁ gured, the generic function associated with it will no longer be active Corresponding functions disabled

- if probe B is faulty or not correctly conﬁ gured, the generic function associated with it will no longer be active Corresponding functions disabled

- if probe C is faulty or not correctly conﬁ gured, the generic function associated with it will no longer be active Corresponding functions disabled

- if probe D is faulty or not correctly conﬁ gured, the generic function associated with it will no longer be active Corresponding functions disabled

- if probe E is faulty or not correctly conﬁ gured, the generic function associated with it will no longer be active A ﬁ xed percentage of speed can be set in the event of faulty or disconnected probe on Cag03 No control action Check T_suc probe *

Check T_dis probe *

Check P_GC probe *

Check T_out *

Check generic an.input A *

Check generic an.input B *

Check generic an.input C *

Check generic an.input D *

Check generic an.input E *

Check P_suc probe *

Fan shutdown Check T_out_GC probe *

No control action The RPRV valve is set to a safety percentage on Fhb26 No control action Vapour injection disabled No control action Vapour injection disabled No action on the parallel compressor Parallel compressor stops for control No action on the parallel compressor Check T_suc_par probe *

Parallel compressor shutdown Check P_dis_LT probe *

No action on the parallel compressor Check T_dis_LT probe *

Compressor shutdown • Check operation, type and setting of evaporator expansion valves (e.g. valve stuck closed)

Compressor shutdown • Check operation, type and setting of evaporator expansion valves (e.g. valve stuck open)

Fans forced to 0% while the alarm is active • Check fans and corresponding alarm settings

Fans forced to 100% while the alarm is active • Check fans and corresponding alarm settings

/ • Check refrigerant charge in the circuit, recharge is necessary

/ • Check oil level in the circuit

Check P_ric probe *

Check P_vap_inj probe *

Check T_vap_inj probe *

Check P_suc_par probe *

• Check mechanical pressure switch safety thresholds

• Check HPV valve setting and operation

• Check correct mechanical operation of the fans (wiring, conﬁ guration,..)

• Check correct positioning and operation of P_GC probe (compare reading on display against pressure gauge reading)

• Check correct compressor operation (possible presence of liquid, excessive refrigerant charge, compressor sizing, ...)

• Check correct mechanical operation of the fans (wiring, conﬁ guration,..)

• Check correct positioning and operation of P_GC probe (compare reading on display against pressure gauge reading)

• Check correct compressor operation (low refrigerant charge, compressor sizing,..)

• Check HPV valve setting and operation

• Check pressure in the receiver

• Check operation of solenoid valve between separator and oil receiver

• Possible oil trapped in the evaporators

/ • Check fan settings and conﬁ guration

• Check fan sizing in relation to the application

• Check correct mechanical operation of the fans (wiring, conﬁ guration,..)

• Check HPV valve setting and operation

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

Screen index

ALB15 High suction pressure Suction pressure exceeds a threshold set on Cae24 x Cae25 Auto

ALB16 Low suction pressure Suction pressure below a settable threshold x Cae27 Auto

ALB22 Oil sensor level broken

ALC01 Alarm 1 compressor 1 Alarm from DI for BLDC compressor set on Cae02 (ge-

ALC02 Alarm 2 compressor 1 Alarm from DI for BLDC compressor set on Cae05 (ge-

ALC26 Alarm 1 parallel compressor Alarm from DI for parallel compressor set on Cbe02

ALC27 Alarm 2 parallel compressor Alarm from DI for parallel compressor set on Cbe05

ALC51 CO2 level alarm Refrigerant leakage outside of the circuit

ALC51 Leak detector alarm Refrigerant leakage in the circuit signalled by DI x Hc05 Auto

ALF01 Fan overload Alarm from DI for one or two fans when fan common

ALG01 Al_Clock Alarm due to problem reading controller clock x ALG02 Extended memory error Faulty controller alarm x ALG11 High thermostat 1…5 alarms High temperature (pressure) alarm

ALG15 Low thermostat 1…5 alarms Low temperature (pressure) alarm

ALG19 High modulating 1-2 alarms High temperature (pressure) alarm

ALG23 Low modulating 1-2 alarms Low temperature (pressure) alarm

ALG27 Generic 1-2 normal alarms Generic alarm 1 or 2 x Ffc07, Ffc09 Auto ALG28 Generic 1-2 serious alarms Serious generic alarm 1 or 2 x Ffc07, Ffc09 Auto ALT01 Compressor working hours Operating hours exceeded for the compressor(s)

ALT07 HPV valve alarm HPV valve alarm from DI settable on Fha04 and HPV

ALT08 RPRV valve alarm RPRV valve alarm from DI settable on Fha05

ALT15 Low superheat alarm Low SH alarm settable on Cae30 x Cae30 Auto/manual

Display Description Serious

or disconnected

Oil level sensor faulty or not conﬁ gured correctly (LT only) The alarm is activated when neither of the two sensors is active from DI

neric, overload, high pressure, low pressure, oil)

(generic, overload, high pressure, low pressure, oil)

signalled by DI

overload is disabled on De05

for generic function 1 to 5

for generic modulating function 1 or 2

selected on Cac13 Compressor operating time shown in Cac01

brought to safety position (Fhb10)

and RPRV brought to safety position (Fhb23)

alarm

x 10 s Auto

x Cbe04 Auto/manual

x Cbe07 Auto/manual

Alarm Delay Reset

x Cae04 Auto/manual

x Cae07 Auto/manual

x Hc06 Auto

x De05 Auto/manual

x Ffa09-13-17-

21-25

x Ffa09-13-17-

21-25

x Ffb08-Ffb14 Auto

x Ffb09-Ffb15 Auto

x Not present Manual

x Not present Auto

Auto

ALT19 DSH Low liquid ﬂ owback SH less than 0 K and DSH at discharge less

ALT20 HPV Valve position warning The HPV valve is at an opening percentage higher than

ALT21 RPRV Valve position warning The RPRV valve is at an opening percentage higher

ALT17 HPV set point warning

Gas cooler press. too low/high, deviation from current set point

ALT18 High receiver pressure alarm Receiver pressure higher than a settable threshold

ALW10 Low superheat warning The SH value as shown on Aa01 is less than a

ALW24 Power plus device oﬄ ine BLDC compressor inverter not present

ALW25 Power+ inverter alarm Inverter alarm n.xx; ALW25 indicates the type of alarm

ALW26 Compressor start failure The diﬀ erential between compressor discharge and

than 10 K for a time set on Cae41

a certain threshold settable on Fhb27

than a certain threshold settable on Fhb28

P_GC is higher or lower than a diﬀ erential set on Fhb17 in relation to the current set point

(Fhb25)

threshold set on Cae30 Warning before the alarm is activated, with a delay that can be set on Cae30

or not connected

generated by the inverter

suction pressure does not increase by a certain value in a set period of time. Minimum variation in pressure diﬀ erence and time period can be set on Cag50

x Cae41 Auto/manual

x Fhb27 Auto

x Fhb28 Auto

x Fhb17 Auto

x Fhb25 Auto

x Not present Auto

x 30-90s Auto

x Not present Auto

x Cag50 Auto for 0-9

attempts

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

Action Troubleshooting

ENG

/ • Check correct compressor operation (presence of liquid, excessive refrigerant charge, compressor sizing,..)

Compressor shutdown, set on Cae27 • Check correct compressor operation (incorrect sizing, low refrigerant charge,..)

LT compressor and parallel compressor shutdown • Check the two level sensors (low, high)

Compressor shutdown • Check BLDC compressor operation based on the type of alarm

Parallel compressor shutdown • Check parallel compressor operation based on the type of alarm

Compressor shutdown, settable on Hc06 Compressor shutdown and fan on settable on Hc05 One or both fans shut down, depending on the conﬁ guration

Actions involving the clock no longer conﬁ gured Unit shutdown Change board / Check the set probe *

/ Check the set probe *

/ Check the set probe * / Check the set probe * / • Check operating hour threshold on screen Cac13

• Evaporators with valves fully open at the same time (e.g. MOP set incorrectly on MPXPRO, valves stuck open,..)

• Evaporators with valves closed and compressors running (valves stuck closed,..)

• Check wiring and electrical panel connections

• Check DI conﬁ guration

• Type of alarm signalled settable on screen Cae02

• Type of alarm signalled settable on screen Cae05

• Type of alarm signalled settable on screen Cbe02

• Type of alarm signalled settable on screen Cbe05

• Check circuit piping

• Check refrigerant charge level in the circuit

• Check piping, valves and circuit components

• Check correct compressor operation

• Check fan connections and correct fan operation

• Fan sizing not suitable for the system

• Excessive refrigerant charge in the circuit

• Reset operating hours on screen Cac14

HPV brought to set safety position when alarm from DI activated RPRV brought to set safety position when alarm from DI activated Compressor shutdown, set on Cae30 • Check the correct reading of the probes set for SH (P_suct and T_suct)

Compressor shutdown • Check correct compressor operation (presence of liquid, refrigerant charge, sizing,..)

/ • Check status of P_GC and T_out_GC probes (type, wiring, correct positioning,..)

/ • Check status of P_ric probe (type, wiring, correct positioning,..)

/ • Check status of T_out_GC probe (type, wiring, correct positioning,..)

Compressor shutdown, set on Cae42 • Check RPRV valve setting, operation and installation (mechanical operation, sizing in relation to the application,

Low superheat warning signal No control action

Compressor shutdown • Check inverter power supply

Compressor shutdown • Check inverter operation and status

Compressor shutdown with manual reset after n restart attempts

• Check the device connected to the DI

• Check compressor status (frost on the outside)

• Check liquid return from evaporators (SH reading on MPXPRO and UC)

• Check evaporator valve operation and status (valves blocked, incorrect conﬁ guration, wiring,..)

• Check MPXPRO/UC setting (probe operation and positioning, correct parameter conﬁ guration, compare probe reading against pressure gauge reading)

• Check correct mechanical operation of the fans (wiring, conﬁ guration, sizing in relation to the application,..)

• Check HPV valve setting, operation and installation (mechanical operation, sizing in relation to the application, correct opening/closing)

• Check warning threshold setting

• Check RPRV valve setting, operation and installation (mechanical operation, sizing in relation to the application, correct opening/closing)

• Check warning threshold setting

• Check mechanical operation of the fans (wiring, conﬁ guration, sizing in relation to the application,..)

• Check warning threshold setting

correct opening/closing)

• Check synchronisation with external driver (wiring and connections, conﬁ gurations,..)

• Sizing of the receiver in relation to the application

• Charge in the circuit

• Check the correct reading of the probes set for SH (P_suct and T_suct)

• Check compressor status (frost on the outside)

• Check liquid return from evaporators (SH reading on MPXPRO and UC)

• Check phase connection between compressor and inverter (wiring and connections)

• Check STO

• Check conﬁ guration of inverter parameters (baud rate, parity, number of bits)

• Check list of alarms in the inverter manual (explanation of the alarms that may occur on the inverter)

• Check compressor connections to the inverter (swapped phases, wiring and incorrect connections,..)

• Check correct compressor operation (liquid in the compressor, excessive charge in the circuit,..)

• Check evaporator valve status (valves stuck open)

• Check positioning, installation and correct operation of P_GC probe (positioning before the check valve at the compressor discharge, checking the values are read correctly)

• Check positioning, installation and correct operation of P_suct probe

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

Screen index

ALW27 Envelope alarm Compressor operation outside of the envelope x Cag55 Auto

ALW28 High discharge gas temperature Compressor discharge temperature exceeds a

ALW29 Compressor low pressure diﬀ erential

ALW30 Inverter model not compatible

ALW37 Alarm stores (generic) Generic alarm evaporator 1 to 5

ALW40-53-6679-92

ALW41-54-6780-93 ALW42-55-6881-94 ALW43-56-6982-95 ALW44-57-7083-96 ALW45-58-7184-97 ALW46-59-7285-98

Display Description Serious

threshold set on Hb02

(insuﬃ cient lubrication)

(Power+ only)

Store 1…5 oﬄ ine Evaporator 1 to 5 conﬁ gured by Hecu but MPXPRO/UC

Store 1…5: Low temperature alarm Low temperature alarm for the probe set on

Store 1…5: High temperature alarm High temperature alarm for the probe set on

Store 1…5: Low temperature alarm 2 Low temperature alarm for the probe set only on MPX-

Store 1…5: High temperature alarm 2 High temperature alarm for the probe set only on

Store 1…5: Defrost timeout End defrost procedure by timeout signal, evaporator

Store 1…5: Low superheat alarm SH evap. 1 to 5 below the threshold; control is activated

Diﬀ erence between BLDC compressor suction and discharge pressure too low

Selected inverter model not compatible with the type of compressor set on Cag02

ALW37 shows the evaporators with active alarms

device not connected via Fieldbus or oﬄ ine

MPXPRO/UC evaporator 1 to 5

PRO evaporator 1 to 5

MPXPRO evaporator 1 to 5

1 to 5

to rapidly close the valve and prevent liquid from returning to the compressor

alarm

x Not present Auto

Alarm Delay Reset

x Cag55 Auto

x Not present Auto

x Not present

x from MPXPRO/

UC (Ad)

x from MPXPRO/

UC (Ad)

x from MPXPRO

(Ad2)

x from MPXPRO

(Ad2)

x from MPXPRO/

UC (dP1, dP2)

x from MPXPRO

(P9)

Auto

ALW47-60-7386-99

ALW48-61-7487-ALZ00

ALW49-62-7588-ALZ01

ALW50-63-7689-ALZ02

ALW51-64-7790-ALZ03 ALW52-65-7891-ALZ04 ALZ06 Liquid return from MPX 1…5

ALZ07 Warning: no DO conﬁ gured for

ALZ08 Carel EXV valve not conﬁ gured on

ALP01 Power + n.2 (n.3) oﬄ ine Parallel compressor inverter not present

ALP02 Power+ n2 (n.3) alarm Inverter no. 2 (no. 3) alarm n.xx

Store 1…5: Low suction temperature alarm

Store 1…5: MOP alarm Evap. pressure in cabinet 1 to 5 above the threshold

Store 1…5: LOP alarm Evap. pressure in cabinet 1 to 5 below the

Store 1…5: stepper driver communication error

Store 1…5: stepper motor error Electronic valve not properly installed x

Store 1…5: installation or conﬁ g problems on EEV driver

oﬄ ine during ﬂ ush

vapour injection ﬂ ow in BLDC

MPXPRO The unit will switch oﬀ in 10 hours

Suction temperature (t_gs) 1 to 5 below threshold, with the risk of liquid returning to the compressor

(parameter PM1 on MPXPRO); control is activated (parameter PM2) to rapidly close the valve

threshold (parameter PL1 on MPXPRO); control is activated (parameter pL2) to rapidly open the valve Incorrect setting of parameter P1 on MPXPRO 1 to 5, which must be set to 2 (management of Carel E2V electronic valve is required)

Valve 1 to 5 end of travel alarm. Valve blocked alarm ("Blo") signalled on MPXPRO MPX 1 to 5 oﬄ ine alarm during washing x

No DO conﬁ gured for the vapour injection function for BLDC compressor in LT applications or for parallel compressor, set on Fda07 Valve managed by MPXPRO/UC is not a Carel E2V electronic valve.

or not connected

Alarm screen ALW25 indicates the type of alarm generated by the inverter

x from MPXPRO

(P12)

x from MPXPRO

(PM3)

x from MPXPRO

(PL3)

x from MPXPRO

(P1)

x Not present Auto

x 30-90s Auto

x Not present Auto

Auto

ALP03 Parallel compressor start failure The diﬀ erential between discharge (P_GC)

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

and suction pressure for the parallel compressor (P_ric) does not increase by a certain value in a period of time set on Cbg50

x Cbg50 Auto for 0 to 9

attempts

Action Troubleshooting

ENG

Compressor shutdown, with a reduction in speed set on Cag54

Compressor shutdown • Check installation and correct operation of the temperature probe (wiring, electrical connections and comparison

Compressor shutdown • Check correct compressor operation (charge, sizing, presence of liquid,..)

Compressor does not start • Check the inverter model installed against the model required by the compressor in the system on screen Cag02

/ • Check evaporator conﬁ guration on screen Eab00 and then on Hecu (number of evaporators, sizing, type of controller

Signal-only alarm

- No action Signal-only alarm

- No action

Signal-only alarm

- No action

Signal-only alarm

- No action

Signal-only alarm

- No action

Signal-only alarm

- No action

• Check positioning, installation and correct operation of P_GC probe (positioning before the check valve at the compressor discharge, checking the values are read correctly)

• Check positioning, installation and correct operation of P_suct probe; 8 operating zones outside of envelope

• Check correct compressor operation (charge, sizing, presence of liquid,..)

against pressure gauge reading)

• Check compressor (enabling the liquid injection function if the discharge temperature is too high, connections to the inverter)

• Check charge in the circuit (low charge)

• Check positioning, installation and correct operation of P_GC probe (positioning before the check valve at the compressor discharge, checking the values are read correctly)

• Check positioning, installation and correct operation of P_suct probe

• Metallic noise made by compressor due to lack of lubrication by the oil

installed,..)

• Check Fbus connection (connections, wiring, polarity,..)

• Check MPXPRO/UC status (check conﬁ guration on the controller, serial address parameter H0; if necessary, repeat commissioning procedure)

installed,..)

• Check Fbus connection (connections, wiring, polarity,..)

• Check MPXPRO/UC status (check conﬁ guration on the controller, serial address parameter H0; if necessary, repeat commissioning procedure)

• Check cabinet/showcase status (correct fan operation, set point)

• Check MPXPRO/UC setting (conﬁ guration and setting of control probes)

• Check cabinet/showcase status (correct fan operation, set point)

• Check MPXPRO/UC setting (conﬁ guration and setting of control probes)

• Check cabinet/showcase status (correct fan operation, set point)

• Check MPXPRO setting (conﬁ guration and setting of control probes)

• Check cabinet/showcase status (correct fan operation, set point)

• Check MPXPRO setting (conﬁ guration and setting of control probes)

• Check cabinet/showcase status (correct fan operation, set point)

• Check MPXPRO setting (conﬁ guration and setting of control probes)

• Check t_gs and p_ev probes (type, wiring, installation position, probe limits, reading compared against mechanical device)

• Check alarm settings

• Check E2V valve operation (correct opening/closing, check that it is not stuck open)

• Compare the SH value read by Hecu to check correct probe operation

• Check t_gs probe (type, wiring, installation position, probe limits, reading compared against mechanical device)

• Check alarm settings

• Check E2V valve operation (correct opening/closing, check that it is not stuck open)

• Check cabinet/showcase status (correct fan operation, set point)

• Check MOP settings (PM parameters on MPXPRO)

• Check compressor capacity in relation to total system cooling demand (insuﬃ cient compressor capacity)

• Check useful when commissioning the system

• Check cabinet/showcase status (correct fan operation, set point)

• Check compressor capacity in relation to total system cooling demand (insuﬃ cient compressor capacity)

• Check LOP settings (PL parameters on MPXPRO)

• Check parameter P1 (this must be set to 2) on MPXPRO in relation to the valve installed on the evaporator (this must be the Carel E2V electronic valve)

Signal-only alarm

- No action Signal-only alarm

- No action Compressor shutdown • Check Fbus connection (connections, wiring, polarity,..)

Signal-only alarm

- No action

Unit shutdown in 10 hours Check parameter P1 (this must be set to 2) on MPXPRO in relation to the valve installed on the evaporator (this must

Parallel compressor shutdown • Check inverter power supply

Parallel compressor shutdown • Check positioning, installation and correct operation of P_GC probe (positioning before the check valve at the com-

Parallel compressor shutdown with manual reset after n restart attempts

Check electronic valves on the respective cabinets

Check parameter P14 on MPXPRO

• Check MPXPRO/UC status (check conﬁ guration on the controller, serial address parameter H0; if necessary, repeat commissioning procedure)

• Check DO setting for LT compressor on screen Fda07

• Check DO setting for parallel compressor on screen Fda08

be the Carel E2V electronic valve)

• Check phase connection between compressor and inverter (wiring and connections)

• Check STO

• Check conﬁ guration of inverter parameters (baud rate, parity, number of bits)

pressor discharge, checking the values are read correctly)

• Check positioning, installation and correct operation of P_ric probe; 8 operating zones outside of envelope

• Check correct compressor operation (charge, sizing, presence of liquid,..)

• Check compressor connections to the inverter (swapped phases, wiring and incorrect connections,..)

• Check correct compressor operation (liquid in the compressor, excessive charge in the circuit,..)

• Check positioning, installation and correct operation of P_GC probe (positioning before the check valve at the compressor discharge, checking the values are read correctly)

• Check positioning, installation and correct operation of P_ric probe

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

Screen index

ALP04 Parallel compressor envelope alarm Compressor operation outside of the envelope x Cbg55 Auto

ALP05 Parallel compressor high discharge

ALP06 Parallel compressor low pressure

ALP07 Parallel compressor inverter model

(*) probe type, wiring, probe installation position, probe limit settings, comparison of value displayed against physical instrument (pressure gauge,..)

Display Description Serious

gas temperature

diﬀ erential (insuﬃ cient lubrication)

not compatible (power+ only)

The parallel compressor discharge temperature exceeds a certain threshold set on Hb04 Diﬀ erence between parallel compressor suction and discharge pressure too low

Selected inverter model for parallel compressor not compatible with the type of compressor used

alarm

Alarm Delay Reset

x Not settable Auto

x Cbg55 Auto

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

Action Troubleshooting

ENG

Compressor shutdown, with speed reduction set on Cbg54

Parallel compressor shutdown • Check t_dis_par probe (type, wiring, installation position, probe limits, reading compared against mechanical device)

Parallel compressor shutdown • Check correct compressor operation (charge, sizing, presence of liquid,..)

Parallel compressor does not start Check the inverter model installed against the model required by the compressor in the system on screen Cbg02

• Check positioning, installation and correct operation of P_GC probe (positioning before the check valve at the compressor discharge, checking the values are read correctly)

• Check positioning, installation and correct operation of P_ric probe; 8 operating zones outside of envelope

• Check correct compressor operation (charge, sizing, presence of liquid,..)

• Check alarm threshold setting on screen Hb04

• Check positioning, installation and correct operation of P_GC probe (positioning before the check valve at the compressor discharge, checking the values are read correctly)

• Check positioning, installation and correct operation of P_ric probe

• Metallic noise made by compressor due to lack of lubrication by the oil

Tab. 8.c

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

9. SOFTWARE UPDATE

9.1 Uploading/updating the software

The following methods can be used to update the ﬁ rmware and acquire the log ﬁ les on pCO controllers:

• SmartKey programming key;

• pCO manager tool, a program installed on a PC.

Smart key

The PCOS00AKY0 key is an electronic device used to program and service the pCO sistema family controllers. PCOS00AKY0 simpliﬁ es data transfer between the controllers installed and a personal computer by exploiting the high capacity ﬂ ash memory for storing software applications, BIOS and variable logs. The pCO is connected directly via the telephone connector using the cable supplied, while to transfer the data to a personal computer, the USB adapter code PCOS00AKC0 is required. The power supply comes either via the USB port on the PC or from the controller, therefore no external power supply is needed.

USB

telephone cable

start

mode

PCOS00AKC0

For the operating instructions, see par. 9.1.

Operating instructions

start

mode

Programming the Smart Key via Personal Computer

The operating modes described in the table below can be conﬁ gured using a program on a PC. The program can also load the software to the key or transfer logged data from the controller to the hard drive.

Type Function Mode button

B Update software from key to pCO (BIOS,

application program, parameters,...)

C* Copy software from pCO to pCO (BIOS,

application program, parameters,...) D Read logs Disabled E Read logged data and software from pCO

(BIOS, application program, parameters,...) F Read logs Disabled G Copy from pCO to pCO and read logs Switches the key to write

*: Default mode

USB

Fig. 9.a

start

mode

Fig. 9.b

Disabled

Switches the key from write mode to read mode

Disabled

mode, read mode and read logs mode

Tab. 9.a

The key is factory-programmed in read/write mode (type C) so that it can be used immediately to transfer software from one controller to another. When the key is connected to the personal computer, the symbols have the following meanings:

Flashing Waiting for connection to PC

Alternating

When connected to PC indicates data transfer in progress

The programming key is compatible starting from BIOS version 3.43 and BOOT version 3.01. For more detailed information on programming the key, see to the pCO Manager manual.

Using the Smart Key with the pCO/μPC programmable controllers

Switch oﬀ the pCO, remove any peripherals connected in the pLAN and plug the key into the telephone connector on the controller. When switching on again, all the symbols light up momentarily and the buzzer emits a beep. A few seconds later the key becomes operational. This waiting period is indicated by the ﬂ ashing of

. The controller then enters programming mode and the start button is on steady; press the button to start data transfer

Important:

• if the key is type B, C or G (in write mode) pressing the start button will

immediately delete the software already loaded on the pCO.

• Do not remove the key while data is being transferred to the key itself,

as the ﬁ le being transferred will be lost and the corresponding space will not be restored. To restore the original capacity all the ﬁ les will need to be deleted. If the key is type “C” or “G”, simply perform a new application read operation.

Meanings of buttons/symbols

Flashing: the key is connecting to the pCO; during this phase, which may last a few seconds, the start button is disabled

start

start+

mode

If the key is type C or G, pressing mode for 1 s switches from read mode

to read logs (G only) or write mode; the symbols (write to pCO),

(read from pCO), type C or G, the mode key is disabled and the light is oﬀ . The start button starts the read or write operation, which will be indicated by the ﬂ ashing

of the corresponding symbol ( to progress. When the operation is completed, the buzzer will sound intermittently for 2 seconds. Pressing the start button again will make the buzzer sound without repeating the operation; to repeat the operation, the key must ﬁ rst be unplugged. In the event of an error, the symbol comes on in combination with the other LEDs. The following table can be used to ﬁ nd the cause of the problem.

Flashing: the key has detected the pCO and is checking the access rights

On steady: pressing the start button will start writing the software to the pCO

On steady: pressing the start button will start reading the software from the pCO

On steady: pressing the start button will start reading the logs from the pCO

On steady: for type C or G keys, pressed for 1 second switches from read to write mode

(read logs) reﬂ ect the selected mode. If the key is not

or ), at a frequency proportional

Tab. 9.b

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

VSTD

UTLF

Errors before pressing the START button

Communication error: no response from the pCO or: Key ﬁ rmware version incompatible

ﬁ les (memory empty; no kit for the type of pCO connected) Incompatibility between the software on the key and the pCO HW

Incompatibility between application program and pCO HW (program size)

+ +

+mode

+ +start

+ +mode

+ +

ﬂ ashing

on steady Password error

ﬂ ashing Incompatible key type

on steady The key is missing one or more required

on steady + start ﬂ ashing on steady + mode ﬂ ashing

on steady No logged data on the pCO

on steady Key type not programmed

Errors after pressing the START key

ﬂ ashing and

+start+ +buzzer

+ +

buzzer on pulsing ﬂ ashing and buzzer on pulsing ﬂ ashing and buzzer on pulsing

on steady + ﬂ ashing

on steady

ﬂ ashing Generic error

Tab. 9.c

The write command failed

The read command failed

The read logs command failed

Incompatibility between log conﬁ guration and pCO HW (no dedicated ﬂ ash memory). This error does not aﬀ ect the writing of the other ﬁ les Insuﬃ cient space to read logged data

Tab. 9.d

As regards the port number, follow the instructions shown in the Wizard for automatic identiﬁ cation (e.g. COM4).

Fig. 9.d

Power the controller oﬀ and on again, and run the connect command to make the connection; when connected, the ONLINE icon will be shown ﬂ ashing in the bottom left corner.

Fig. 9.e

Application program installation

•

Select the directory where the application program ﬁ les are located, and run the Upload command to load this onto the pCO controller.

pCOmanager: operating instructions

pCO Manager is a program for managing all conﬁ guration, debugging and maintenance operations on CAREL pCO sistema devices. It can be installed as a stand-alone program or integrated into the 1tool programming environment.

Installing pCOmanager

Go to http://ksa.carel.com, and in the pCO sistema section select pCO_ manager. After accepting the general terms and conditions for the free software license, a window will open for downloading the pCO_manager. zip ﬁ le. Install the program on the computer.

PC - pCO controller connection

The computer's USB port must be connected to a cable with USB/RS485 converter, and this must in turn be connected via telephone cable to the pLAN port on the pCO.

USB

CVSTDUTLF0

power supply

USB

Fig. 9.f

Commissioning

•

Use the mouse to select commissioning at the bottom left. A new work environment will be opened.

Fig. 9.g

• Run the "conﬁ gure device" command to display all of the application

variables. These can be selected based on the categories shown at the bottom.

Fig. 9.c

When the pCO_manager program is opened, a screen is displayed, showing the connection settings at the top right. Select:

1. local connection;

2. baud rate: Auto;

3. device search: Auto (pLAN).

Fig. 9.h

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

ENG

Changing a parameter

Choose the category of parameters and then the parameter to be set: this is highlighted by a blue line (e.g. recovery.recovery_type).

Fig. 9.i

1. Double click the mouse on the read column. A window is displayed

for entering the new parameter value.

Fig. 9.j

2. Write the new value (e.g. 3) and select OK. The new value is displayed

in the written column. To write the parameter to the pCO controller, click the right mouse button and run the write selected command. The new value is displayed, conﬁ rm the value in the written column.

Fig. 9.k

Finally, run the Save command to generate the project .2cw ﬁ le.

Support  les

At the end of the application program design phase, 1tool generates several ﬁ les during compilation; two of these are required for commissioning:

• <applicationName>.2CF (variable descriptor);

• <applicationName>.2CD (descriptor of categories and access proﬁ les).

In addition to these ﬁ les, the <applicationName>.DEV ﬁ le can also be managed, which contains the pre-set unit parameters. After having completed commissioning, either for conﬁ guration or monitoring, the user can generate the following ﬁ les:

• <applicationName>.2CW (descriptor of categories, access proﬁ les,

monitoring groups);

• <CommissioningLogFileName>.CSV (ﬁ le used for the commissioning

log, with the data of the variables logged during monitoring).

The commissioning conﬁ guration phase thus requires the following ﬁ les: .2CF, 2CD and where possible the .DEV ﬁ le, which can be imported and exported. For the monitoring phase, in addition to the above ﬁ les, the .2CW ﬁ le may be needed, with the deﬁ nition of the speciﬁ c work environment. The commissioning log ﬁ le is a simple output ﬁ le.

pCO Load: basic concepts

pCOLoad is the module that manages:

• uploading to ﬂ ash memory (ProgKeyX device or key installed on the

pCO);

• uploading to NAND memory on certain devices;

• downloading logs, .DEV ﬁ le and P memory (from ﬂ ash memory).

• downloading NAND memory ﬁ les, if present.

The following ﬁ les are exchanged with the pCO ﬂ ash memory:

• Boot.BIN (download reserved, upload enabled from menu);

• Bios.BIN (download reserved);

• <applicationName>.BLB (download reserved );

• <applicationName>.BIN (download reserved );

• <applicationName>.DEV;

• <applicationName>.GRT (upload only, from which the .GRP is

extracted);

• <applicationName>.IUP;

• <applicationName>.LCT;

• <applicationName>.PVT;

• <pCOlogName>.BIN, <pCOlogName>.CSV, <pCOlogName_GRAPH>.

CSV (only if logs have been conﬁ gured, download only).

The following ﬁ les are exchanged with the pcO NAND memory:

• All of the ﬁ les that the pCO can autonomously copy to the ﬂ ash

memory (see the previous list);

• External ﬁ les (e.g.: PDF, .doc for documentation).

Commissioning tool: basic concepts

Note: the following paragraphs are taken from the pCOmanager

program online help; refer to this for any further details.

The commissioning tool is real-time conﬁ guration and monitoring software used to check the operation of an application program installed on a pCO, for commissioning a pCO, debugging and maintenance. This tool can be used to set the conﬁ guration parameters, modify the values of volatile and permanent variables, save the trends of the main unit values to a ﬁ le, manually manage the unit I/Os using simulation ﬁ les, and monitor/reset the alarms on the unit where the device is installed. The commissioning operations ﬁ rst require conﬁ guration of the work environment, typically the task of the designer. The active 1tool project is automatically loaded by the pCO Manager. The commissioning tool conﬁ guration functions allow the designer to decide which variables will be included in the monitoring/log/trend/event monitoring activities, to organise variables into categories, and to set groups of conﬁ guration parameter. Users who use the commissioning tool during maintenance operations will already have access to the required variables, and will be able to refer to pre-set conﬁ guration values.

Hecu CO2 +0300085EN rel. 2.2 - 07.05.2019

LogEditor: basic concepts

LogEditor is the module used to conﬁ gure pCO device logs (pCO log). Conﬁ guring pCO logs involves deﬁ ning a number of sets of variables for specifying which variables should be logged, the logging method (by frequency or by event) and the guaranteed minimum number of records required. Conﬁ guration is based on a binary ﬁ le (.PVT – Public Variable Table), which is generated by 1Tool and contains the descriptive data of the variables that can be logged. All the log conﬁ gurations so deﬁ ned are saved in the .LCT (Log Conﬁ guration Table) binary ﬁ le, which must be uploaded to the pCO together with the .PVT ﬁ le. Log conﬁ guration data is also saved in a ﬁ le that can be used only by LogEditor – the .LEF ﬁ le, which must be saved to be edited with LogEditor when necessary. LogEditor can be used even when the device is not connected. Once the ﬁ les for logging are uploaded to the pCO, the pCO saves the logged data in the following ﬁ les:

• a .BIN ﬁ le containing all the data in binary format;

• a .CSV ﬁ le containing the same data but in a generic format with

comma separated values;

• a *_GRAPH.CSV ﬁ le with the same data, to be used for graphs.