Carel EVD ice User Manual

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EVD ice

Superheat control for unipolar electronic expansion valve

User manual

High Efficiency Solutions

NO POWER

& SIGNAL

CABLES

TOGETHER

READ CAREFULLY IN THE TEXT!

ENG

WARNINGS

CAREL bases the development of its products on decades of experience in HVAC, on the 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 nonetheless cannot guarantee that all the aspects of the product and the software included with the product respond to the requirements of the nal application, despite the product being developed according to start-of-theart techniques. The customer (manufacturer, developer or installer of the nal equipment) accepts all liability and risk relating to the conguration of the product in order to reach the expected results in relation to the specic nal installation and/or equipment. CAREL may, based on specic agreements, acts as a consultant for the positive commissioning of the nal unit/application, however in no case does it accept liability for the correct operation of the nal equipment/system.

The CAREL product is a state-of-the-art product, whose operation is speci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/conguration/programming/commissioning to be able to operate in the best possible way for the specic application. The failure to complete such operations, which are required/indicated in the user manual, may cause the nal product to malfunction; CAREL accepts no liability in such cases. Only quali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 speci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 speci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 specied in the

technical manual.

DISPOSAL

INFORMATION FOR USERS ON THE CORRECT

HANDLING OF WASTE ELECTRICAL AND ELEC-

TRONIC EQUIPMENT (WEEE)

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

1. WEEE cannot be disposed of as municipal waste and such waste must be collected and disposed of separately;

2. the public or private waste collection systems de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;

3. the equipment may contain hazardous substances: the improper use or incorrect disposal of such may have negative eects on human health and on the environment;

4. the symbol (crossed-out wheeled bin) shown on the product or on the packaging and on the instruction sheet indicates that the equipment has been introduced onto the market after 13 August 2005 and that it must be disposed of separately;

5. in the event of illegal disposal of electrical and electronic waste, the penalties are specied by local waste disposal legislation.

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

Approval: the quality and safety of CAREL INDUSTRIES products are guaranteed by the ISO 9001 certied design and production system, as well as by the marks (*).

All of the above suggestions likewise apply to the controllers, serial boards, 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 specications shown in the manual may be changed without prior warning.

The liability of CAREL in relation to its products is specied in the CAREL general contract conditions, available on the website www.carel.com and/or by specic agreements with customers; specically, to the extent where allowed by applicable legislation, in no case will CAREL, its employees or subsidiaries 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 are warned of the possibility of such damage.

CAUTION: separate as much as possible the probe and digital input signal cables from the cables carrying inductive loads and power cables to avoid possible electromagnetic disturbance. Never run power cables (including the electrical panel wiring) and signal cables in the same conduits.

NO POWER

& SIGNAL

CABLES

TOGETHER

READ CAREFULLY IN THE TEXT!

“EVD ice” +0300038EN - rel. 1.1 - 23.04.2018

Content

1. INTRODUCTION 7

1.1 Models ............................................................................................................ 7

1.2 Functions and main characteristics ............................................................. 7

1.3 Accessories ....................................................................................................... 7

2. INSTALLATION 8

2.1 Dimensions - mm (in) ................................................................................... 8

2.2 Assembly on the evaporator ........................................................................ 8

2.3 Application diagrams ...................................................................................... 9

2.4 Wiring description ......................................................................................... 10

2.5 Wiring .............................................................................................................. 10

3. USER INTERFACE 11

3.1 Keypad.............................................................................................................11

3.2 Display and visualisation ............................................................................ 11

3.3 Programming mode ..................................................................................... 11

3.4 Restore default parameters (factory) ........................................................ 11

ENG

4. COMMISSIONING 12

4.1 Commissioning procedure ......................................................................... 12

4.2 Parameters ﬁrst conﬁguration .................................................................... 12

5. FUNCTIONS 13

5.1 Control ............................................................................................................. 13

5.2 Special control function: smooth lines ..................................................... 14

5.3 Service parameters ....................................................................................... 14

6. PROTECTORS 15

6.1 Protectors ........................................................................................................ 15

7. PARAMETERS TABLE 17

8. NETWORK CONNECTION 18

8.1 RS485 serial conﬁguration .......................................................................... 18

8.2 Network connection for commissioning via PC .................................... 18

8.3 Visual parameter manager .......................................................................... 18

8.4 Restore default parameters ......................................................................... 19

8.5 Setup by direct copy ..................................................................................... 19

8.6 Setup using conﬁguration ﬁle .................................................................... 20

8.7 Read the conﬁguration ﬁle on the controller ........................................ 20

8.8 Variables accessible via serial connection .............................................. 21

8.9 Control states ................................................................................................. 22

8.10 Special control states .................................................................................... 23

9. ALARMS 24

9.1 Types of alarms ..............................................................................................24

9.2 Probe alarms .................................................................................................. 24

9.3 Control alarms ............................................................................................... 24

9.4 Valve emergency closing procedure .........................................................24

9.5 Network alarm ............................................................................................... 24

9.6 Alarm table .................................................................................................... 25

10. TROUBLESHOOTING 25

11. TECHNICAL SPECIFICATIONS 26

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1. INTRODUCTION

ENG

EVD ice is an electronic superheat controller for Carel unipolar expansion valves. EVD ice has been specially designed to be installed near the valve, directly on the refrigerant circuit, simplifying installation and making electronic expansion valve technology available directly on board the unit. The plastic cover material on EVD ice guarantees total protection, allowing the controller to operate in particularly dicult environmental conditions, such as low temperatures and high humidity (condensation). EVD ice can be installed directly on a unit cooler/evaporator inside a cold room. The controller is already tted with sensors, signal and power cables: to complete the system, simply select the most suitable valve body and pressure transducer for the required cooling capacity from the compatible Carel product range.

EVD ice controls refrigerant superheat and optimises refrigerant circuit eciency. It allows considerable system exibility, being compatible with various types of refrigerants, in applications with refrigerators and chiller/air-conditioners. It features low superheat protection (LowSH), high evaporation pressure (MOP) and low evaporation pressure (LOP) functions.

The device also has a user interface that displays the instant superheat value at all times, signals any alarms, and above all can be used to set the operating parameters.

When installing the controller, only three initial parameters are required to start controlling the valve in the system:

- type of refrigerant

- operating mode (cold room, showcase, etc.)

- superheat set point.

EVD ice can easily be accessed via an RS485 serial connection (Modbus protocol), for supervision of operating parameters and alarms in real time. The serial connection can also be used to set the operating parameters over a remote connection; in this case, combination with other Carel controllers is recommended (supervisors and cold room controllers).

1.3 Accessories

Ratiometric pressure probe P/N SPKT0013P0 (-1 to 9.3 bars)

The ratiometric pressure probe specied as default for assembly is P/N SPKT0013P0, with an operating range from -1 to 9.3 barg. Alternatively, other probes can be installed, setting the corresponding parameter accordingly. See the “Functions” chapter.

Fig. 1.a

1 2

P/N Type Photo nr.

SPKT0053P0 -1…4.2 barg 1 SPKT0013P0 -1…9.3 barg SPKT0043P0 0…17.3 barg SPKT0033P0 0…34.5 barg SPKT00B6P0 0…45 barg SPKT00E3P0 -1…12.8 barg SPKT00F3P0 0…20.7 barg SPKT00G1S0 0…60 barg 2 SPKT00L1S0 0…90 barg

Tab. 1.b

Unipolar valve body

The valve body, to be purchased separately, is assembled using the stator supplied with EVD ice. For the part numbers, see the CAREL product catalogue.

1.1 Models

P/N Description

EVDM011R3* EVD ice 115/230 V, E2V stator, display EVDM011R1* EVD ice 115/230 V, E2V stator, display, Ultracap module

connector EVDM011R4* EVD ice 115/230 V, E3V stator, display EVDM011R2* EVD ice 115/230 V, E3V stator, display, Ultracap module

connector (*): 0/1=single/multiple package (10 pcs)

Tab. 1.a

1.2 Functions and main characteristics

In summary:

• superheat control with LowSH, MOP, LOP functions;

• compatibility with various types of refrigerants;

• guided setup procedures rst, entering just three parameters on the

user interface: refrigerant (Gas), type of control (Mode) and superheat set point (Superheat);

• activation/deactivation of control via digital input or remote control

via serial connection;

• controller and valve power supply incorporated (230 V/115 V);

• RS485 serial communication incorporated (Modbus protocol);

• IP65/IP67;

• operating conditions: -30T40C° (-22T104°F);

• compatible with Carel E2V and E3V single-pole valves.

Fig. 1.b

Ultracap module (P/N EVDMU**R**)

The module guarantees temporary power to the driver in the event of power failures, for enough time to immediately close the connected electronic valve. It avoids the need to install a solenoid valve. The module is made using Ultracap storage capacitors, which ensure reliability in terms of much longer component life than a module made with lead batteries.

Fig. 1.c

From the software revision 1.7 the Smooth lines function has been introduced.

“EVD ice” +0300038EN - rel. 1.1 - 23.04.2018

ENG

79.4 (3.1)

92.4 (3.6)

∅

4.5 (0.2)

170 (6.7)

45.5 (1.8)

61.3 (2.4)

40.7(1.6)

19.6 (0.8)

~230 (9.1)

GAS Type

Mode

Super Heat

2.1 Dimensions - mm (in)

2. INSTALLATION

Cable (*) Length (±5%)

Power supply 500 (19.7) RS485 500 (19.7) Pressure probe 800 (31.5) --> E2V

1800 (70.9) --> E3V NTC probe 1800 (70.9) E2V/ E3V valve 600 (23.6) Ultracap 100 (3.9)

Fig. 2.a

2.2 Assembly on the evaporator

Important:

• install EVD ice on the evaporator away from the places where

ice forms;

• connect the power and serial cables in the IP65 junction box;

• for assembly of the E2V/ E3V valve, see the “ ExV system” guide

(+030220810).

Condenser

Liquid

separator

Filter

Liquid

indicator

Solenoid

valve

E2V/ E3V Unipolar expansion valve

EVD ice

Compressor

P T

(*)= for standard CAREL part numbers

EVD ice can be installed directly on the evaporator. Mark the position and drill the holes (Ø <4.5 mm). Then tighten the fastening screws.

Fig. 2.c

WALL

NTC temp. probe

Ratiometric pressure transducer

Evaporator unit

“EVD ice” +0300038EN - rel. 1.1 - 23.04.2018

Evaporator

Fig. 2.b

2.3 Application diagrams

WITH SOLENOID VALVE

ENG

ON / OFF

COLD ROOM

Electrical panel

Regulator

OUT

Solenoid

valve

COLD ROOM

Evaporator

unit

EEV

P T

IP65

230 V input

EVD ICE

driver 230 V

COLD ROOM

OUT

Condenser

unit

Compressor

WITHOUT SOLENOID VALVE, WITH ULTRACAP MODULE

COLD ROOM

OUT

Electrical panel

Regulator

ON / OFF

Fig. 2.d

COLD ROOM

Evaporator

unit

EEV

P T

IP65

230 V input

EVD ICE

driver 230 V

EVD ICE

ULTRACAP

COLD ROOM

OUT

Condenser

unit

Compressor

Fig. 2.e

“EVD ice” +0300038EN - rel. 1.1 - 23.04.2018

ENG

digital input to start

the regulation

230 Vac

2.4 Wiring description

The driver for superheat control requires the use of an evaporation pressure probe S1 and suction temperature probe S2, which will be tted downstream of the evaporator, and a digital input to trigger control. Alternatively, the signal to trigger control can be sent via a remote serial connection.

Note: input S1 is programmable. See the “Functions” chapter

The following are already wired on EVD ice:

• pressure probe and temperature probe cables;

• electronic expansion valve stator;

• Ultracap module connection cable (on models where featured);

• power and serial line cables.

The power and serial line connections are identied by the colours of the wires.

Note: for probe installation see “Guide to EEV system”, (+03022811).

CAREL E V/ E V

² ³

unipolar valve

0,3 Nm

Non rimuovere il cappuccio di protezione A!

Do not remove the protection cap A!

Valve stator

ULTRACAP

Module

NTC

GAS Type

Mode

Super Heat

ratiometric

pressure

transducer

pasta conduttiva/ conductive cream

fascetta di ssaggio/ fastening band

fascia elastica/ elastic band

Fig. 0.a

marrone/ brown - L blu/ blue - N nero/ black - DI

Tab. 0.a

verde/ green - GND bianco/ white - Tx/Rx+ nero/ black - Tx/Rx-

VPM

CVSTDUM0R0

pCO

Modbus®

RS485

shield shield

Rif Cable Description

A ExV Unipolar electronic valve connection B Ultracap Ultracap module connection (accessory) C Probe S2 NTC temperature probe D probe S1 Ratiometric pressure probe E Power supply

L: brown Phase 230 V N: blue Neutral 230 V DI: black 230 V digital input to enable control

F Serial

Tx/ Rx +: white RS485 connection Tx/ Rx -: black

GND: green 1 - Computer for conguration 2 - USB– RS485 converter (for computer)

2.5 Wiring

For installation, proceed as shown below, with reference to the wiring diagrams and the technical specications table:

1. connect the pressure probe that suits the refrigerant. For details on

refrigerant ---> suggested pressure probe, see the chapter on “Commissioning”;

2. connect the power cable and the digital input cable: for the maximum

length, see the technical specications;

3. power on the driver: the display will light up, and the driver will await the

commissioning parameters. See the chapter on “Commissioning”;

4. program the driver, if necessary: see the “User interface” chapter.

Note: if connecting to a serial network, see the previous diagram for

details on connecting the shield to earth.

Installation environment

Important: avoid installing the drivers in environments with the

following characteristics:

• strong vibrations or knocks;

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

and ammonia fumes, saline mist, smoke) to avoid corrosion and/or oxidation;

• strong magnetic and/or radio frequency interference (therefore avoid

installing the devices near transmitting antennae);

• exposure of the drivers to direct sunlight and to the elements in

general.

Important: the following warnings must be observed when

connecting the drivers:

• if the driver is used in a way that is not specied in this user manual,

protection cannot be guaranteed;

• incorrect power connections may seriously damage the driver;

• separate as much as possible (at least 3 cm) the probe and digital input

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

• do not run probe signal 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;

• *EVD ice is a controller to be incorporated into the nal equipment; it

must not be wall-mounted;

• * DIN VDE 0100: protective separation must be guaranteed between

the SELV circuits (Safety Extra Low Voltage) and the other circuits. The requirements of DIN VDE 0100 must be complied with. To prevent disruption of the protective separation (between the SELV circuits and the other circuits) ensure additional fastening near the terminations. This additional fastening must secure the insulation and not the wires.

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3. USER INTERFACE

-99 --->

ENG

The user interface comprises the two-digit display and keypad with three buttons that, pressed alone or in combination, are used to perform all the conguration and programming operations on the driver.

GAS Type

Super Heat

1 2

Mode

Fig. 3.a

Key

1 Parameter label (for commissioning/setup) 2 Keypad 3 LED status digital input start/stop control

4 Two-digit display

blink/OFF = DI closed/open

(*) when digital input is closed the LED blinks and control is active.

During commissioning/setup, the parameter label shows the meaning of the segments displayed in the rst digit, corresponding to the three parameters being set:

A. GAS Type: type of refrigerant; B. Mode: operating mode; C. Superheat: superheat set point.

Commissioning

See the “

GAS Type

Mode

Super Heat

A. Refrigerant B. Mode (operating mode) C. Superheat set point

” chapter.

GAS Type

Mode

Super Heat

GAS Type

Mode

Super Heat

3.1 Keypad

Key Description

UP / DOWN

PRG/Set

• Increases/decreases the value of the set point or

other selected parameter

• At the end of the commissioning procedure, if

pressed for 2 s, exits the menu and control starts;

• Enter/ exit programming mode, saving the

parameters;

• Reset E8 alarm.

Tab. 2.a

123 --->

GAS Type

Mode

Super Heat

GAS Type

Mode

Super Heat

GAS Type

Mode

Super Heat

GAS Type

Mode

Super Heat

Fig. 3.b

Note: the decimal point in the digit on the right indicates the status

of the digital start/stop adjustment input. With the input closed the dot is lit ashing.

3.3 Programming mode

The parameters can be modied using the front keypad.

Important: modify the control parameters, ONLY AFTER having

completed the guided commissioning procedure, described in chapter 4.

Modifying the Service parameters

The Service parameters include, in addition to the parameters for the conguration of input S1, those corresponding to the network address, probe readings, protectors and manual positioning. See the parameter table.

Procedure:

1. press UP and DOWN together and hold for more than 5 s: the rst

parameter is displayed: P1 = probe S1 reading;

2. press UP/ DOWN until reaching the desired parameter;

3. press PRG/ Set to display the value;

4. press UP/ DOWN to modify the value;

5. press PRG/ Set to conrm and return to the parameter code;

6. repeat steps 2 to 5 to modify other parameters;

7. (when the parameter code is displayed) press PRG/Set and hold for more

than 2 s to exit the parameter setting procedure.

GAS Type

Mode

Super Heat

Fig. 3.c

3.2 Display and visualisation

During normal operation, the two-digit display shows the superheat measure and any alarms. The display interval for the superheat value is -5 to 55 K (-9 to 99 °F). In general, values between -99 and 999 are displayed as follows:

1. values from 0 to 10 are displayed with decimal point and decimals;

2. values greater than 99 are displayed in two steps:

- rst, the hundreds, followed by “H”

- then the tens and units.

3. values less than -9 are displayed in two steps:

- rst the “-“sign;

- then the tens and units.

Note: if no button is pressed, after around 30 s the display

automatically returns to standard visualisation.

3.4 Restore default parameters (factory)

The driver can be reset to the default parameter values.

Procedure: when the display is on standby, press all three buttons together . After 5 seconds, the display shows “rS”. The reset procedure can be conrmed within 10 seconds, by pressing PRG/SET for 3 seconds. If no button is pressed during this time, the procedure will be cancelled. At the end the display shows two hyphens and then awaits the commissioning parameters.

“EVD ice” +0300038EN - rel. 1.1 - 23.04.2018

ENG

GAS Type

Mode

Super Heat

GAS Type

Mode

Super Heat

4. COMMISSIONING

Important: if the refrigerant is not available among the refrigerant

parameter options, contact CAREL service to:

1. conrm that the system: (c.pCO/Ultracella,...)+ EVD ice + CAREL electronic

expansion valve is compatible with the desired refrigerant (Gas

type=custom);

2. identify the values that dene the custom refrigerant and enter them for

parameters: “Dew a…f high/low” . See the variables accessible via

serial connection.

4.1 Commissioning procedure

Once the electrical connections have been completed (see the chapter “Installation”) and the power supply has been connected, the operations required for commissioning the driver depend on the type of interface used, however essentially involve setting just 3 parameters: refrigerant,

functioning mode, superheat setpoint.

5. Press Down to move to the next parameter: Mode, indicated by the

bar in the middle;

6. Repeat steps 2,3,4,5, to set the values of the other parameters: Mode,

Superheat set point;

GAS Type

Mode

Important:

• until the commissioning procedure has been completed, control will not be active;

• (only during commissioning) changing the gas involves changing the value of the ratiometric probe parameter.

After powering up the driver, the display lights and the driver waits the control parameters, indicated by the hyphens. The default parameters are:

1. Refrigerant = R404A;

2. Type of control = multiplexed showcase/cold room

3. Superheat set point = 11 K.

Procedure:

1. The controller displays the bar at the top: refrigerant (GAS Type);

GAS Type

Mode

Super Heat

2. Press PRG/Set: the refrigerant setting is shown = 3: R404A

GAS Type

Mode

Super Heat

7. Press PRG/Set for 2 seconds to exit the commissioning procedure

and start control. The standard display is shown.

4.2 Parameters rst conguration

Important: ONLY DURING commissioning, changing the gas

involves changing the value of the ratiometric probe parameter; if not specied in the table, the type of ratiometric probe is -1...9.3 barg.

Parameter/ description Def.

Gas Type = refrigerant

0 Custom 1 R22 15 R422D 28 R1234ze(-1...4.2 barg) 2 R134a 16 R413A 29 R455A (-1...12.8 barg) 3 R404A 17 R422A 30 R170 (0...17.3 barg) 4 R407C 18 R423A 31 R442A (-1...12.8 barg) 5 R410A 19 R407A 32 R447A (-1...12.8 barg) 6 R507A 20 R427A 33 R448A 7 R290 21 R245FA 34 R449A 8 R600(-1...4.2 barg) 22 R407F 35 R450A (-1...4.2 barg) 9 R600a (-1...4.2 barg) 23 R32 (0...17.3 barg) 36 R452A (-1...12.8 barg) 10 R717 24 HTR01 37 R508B (-1...4.2 barg) 11 R744 (0...45 barg) 25 HTR02 38 R452B 12 R728 26 R23 39 R513A (-1...4.2 barg) 13 R1270 27 R1234yf 40 R454B 14 R417A 41 R458A

Note: if the refrigerant is not available among the refrigerant

options, “GAS Type=refrigerant”:

1. set any refrigerant (for example R404);

2. select the type of operating mode (Mode), the superheat set point and complete the commissioning procedure;

3. use the VPM program (Visual Parameter Manager, see the chapter “Network connection” ) and set the refrigerant type “0= Custom” and the parameters “Dew a...f high/low” which dene the refrigerant (see variables accessible via serial connection);

4. start control, for example by closing the digital input contact to enable operation.

3 = R404A

Tab. 4.a

3. Press UP/Down to change the value

GAS Type

Mode

Super Heat

4. Press PRG/Set to save and return to the refrigerant parameter code

(bar at the top)

“EVD ice” +0300038EN - rel. 1.1 - 23.04.2018

Mode = operating mode

1 Multiplexed cabinet/cold room 2 Air-conditioner/chiller with plate heat exchanger 3 Air-conditioner/chiller with tube bundle heat exchanger 4 Air-conditioner/chiller with nned coil heat exchanger 5 Reserved 6 Reserved 7 Cabinet/cold room with subcritical (R744) CO2

Superheat setpoint 11 K(20°F)

Note: consider the unit of measure (°C/°F) when setting the

superheat setpoint (Si parameter).

1 = Multiplexed cabinet/ cold room

Tab. 4.b

5. FUNCTIONS

5.1 Control

EVD ice is a superheat controller. The type of refrigeration unit can be selected using the “Operating mode” parameter.

ENG

Parameter/description Def.

Operating mode

1 = multiplexed cabinet/ cold room

Tab. 5.a

Based on the operating mode setting , the driver automatically sets a series of control parameters.

Operating mode PID: pro-

port. gain

1 Multiplexed cabinet/cold room 15 150 11 5 15 -50 0 50 20 2 Air-conditioner/chiller with plate heat exchanger 3 40 6 2 2,5 -50 4 50 10 3 Air-conditioner/chiller with tube bundle heat exchanger 5 60 6 2 2,5 -50 4 50 10 4 Air-conditioner/chiller with nned coil heat exchanger 10 100 6 2 10 -50 10 50 20 5 Reserved - - - - - - - - 6 Reserved - - - - - - - - 7 Banco frigo/cella con CO2 (R744) sub-critica

PID: integra-

tion time

20 400 13 7 15 -50 0 50 20

Superheat

set point

LowSH protection LOP protection MOP protection

threshold Integra-

tion time

threshold Integra-

tion time

thre-

shold

Integra-

tion time

Tab. 5.b

Superheat

The primary purpose of the electronic valve is ensure that the ow-rate of refrigerant that ows through the nozzle corresponds to the ow-rate required by the compressor. In this way, the evaporation process will take place along the entire length of the evaporator and there will be no liquid at the outlet (consequently in the branch that runs to the compressor). As liquid is not compressible, it may cause damage to the compressor and even breakage if the quantity is considerable and the situation lasts some time.

A low superheat temperature in fact corresponds to a situation of probable instability due to the turbulent evaporation process approaching the measurement point of the probes. The expansion valve must therefore be controlled with extreme precision and a reaction capacity around the superheat set point, which will almost always vary from 3 to 14 K. Set point values outside of this range are quite infrequent and relate to special applications.

Superheat control

The parameter that the control of the electronic valve is based on is the superheat temperature, which eectively tells whether or not there is liquid at the end of the evaporator. The superheat temperature is calculated as the dierence between: superheated gas temperature (measured by a temperature probe located at the end of the evaporator) and the saturated evaporation temperature (calculated based on the reading of a pressure transducer located at the end of the evaporator and using the Tsat(P) conversion curve for each refrigerant).

Superheat =

(*) suction

Superheated gas

temperature

(*)

If the superheat temperature is high it means that the evaporation process is completed well before the end of the evaporator, and therefore ow-rate of refrigerant through the valve is insucient. This causes a reduction in cooling eciency due to the failure to exploit part of the evaporator. The valve must therefore be opened further. Vice-versa, if the superheat temperature is low it means that the evaporation process has not concluded at the end of the evaporator and a certain quantity of liquid will still be present at the inlet to the compressor. The valve must therefore be closed further. The operating range of the superheat temperature is limited at the lower end: if the ow-rate through the valve is excessive the superheat measured will be near 0 K. This indicates the presence of liquid, even if the percentage of this relative to the gas cannot be quantied. There is therefore un undetermined risk to the compressor that must be avoided. Moreover, a high superheat temperature as mentioned corresponds to an insucient ow-rate of refrigerant. The superheat temperature must therefore always be greater than 0 K and have a minimum stable value allowed by the valve-unit system.

Saturated evaporation

–

temperature

EEV

Fig. 5.a

Key

CP compressor EEV electronic expansion valve C condenser V solenoid valve L liquid receiver E evaporator F dewatering lter P pressure probe (transducer) S liquid indicator T temperature probe

For the wiring, see

“Wiring description”

“EVD ice” +0300038EN - rel. 1.1 - 23.04.2018

ENG

PID parameters

Superheat control uses a PID algorithm. The control output is calculated as the sum of separate contributions: proportional and integral.

• the proportional action opens or closes the valve proportionally to

the variation in the superheat temperature. Thus the greater the K (proportional gain) the higher the response speed of the valve. The proportional action does not consider the superheat set point, but rather only reacts to variations. Therefore if the superheat value does not vary signicantly, the valve will essentially remain stationary and the set point cannot be reached;

• 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 Ti (integral time), the more intense the action will be. The integral time, in summary, represents the intensity of the reaction of the valve, especially when the superheat value is not near the set point.

See the “EEV system guide” +030220810 for further information on calibrating PID control.

Par. Description Def. Min. Max. UoM

- Superheat set point PID proport. gain 15 0 800 -

PID integral time 150 0 999 s

Note: when selecting the type of Mode, the PID control values

suggested by CAREL will be automatically set for each application.

LowSH: threshold 55 (99) K(°F)

11(20)

Protector control parameters

See the chapter “Protectors”.

SH_set+

Smooth_line

SH set

Temp. set

Fig. 5.b

Key

SH set Superheat set point t time Temp.set Temperature set point

Note: the temperature setting based on the corresponding set

point is managed by the master controller, while superheat control is managed by the EVD ice.

5.3 Service parameters

The other conguration parameters, to be set where necessary before starting the controller, concern :

• the type of ratiometric pressure probe;

• the serial address for network connection;

• the type of unit of measure;

• enabling change in type of control (Mode);

• the number of steps (480/960) to control valve position.

5.2 Special control function: smooth lines

Note: the Smooth_line parameter is only accessible via the

supervisor.

The smooth lines function optimises evaporator capacity based on actual cooling demand, allowing more eective and stable control. The function completely eliminates traditional on/o 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 master controller (connected via serial to EVD mini), through dynamic management of the Smooth_line parameter, modies the superheat set point for management of the electronic expansion valve, from a minimum (SH_SET) to a maximum (SH_SET + Smooth_line): this consequently acts directly on the PID control algorithm that modies the valve position. This is useful when the control temperature approaches the set point; the Smooth_line parameter is used to prevent the valve from closing, by reducing the evaporator’s cooling capacity. In order to use this function, the digital input must be congured as BACKUP. The Smooth_line parameter thus allows the control set point to be adjusted instantly. In the event where there is no network connection, the Smooth_line parameter is reset so as to resume normal control (START/STOP from digital input and SH_SET as the superheat set point). The main e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.

Par. Description Def. Min. Max. U.M.

Smooth_line

DI conguration 1=start/stop 2=control backup A: superheat set point oset for smooth lines

1 1 2 -

0 -99(-55) 99(55) K/°F

Type of pressure probe (par. S1)

S1 is used to select the type of ratiometric pressure probe.

Par. Description Def. Min. Max. UoM

type of probe S1

1 = -1…4.2 barg 2 = 0.4…9.3 barg 3 = -1…9.3 barg 4 = 0…17.3 barg 5 = 0.85…34.2 barg 6 = 0…34.5 barg 7 = 0…45 barg 8 = -1…12.8 barg 9 = 0…20.7 barg 10 = 1.86…43.0 barg 11 = Reserved 12 = 0...60 barg 13 = 0...90 barg

Note: when setting the probe type, the maximum and minimum

limits for the pressure alarm are automatically dened. See “Variables aaccessible via serial connection”.

3 1 13 -

Network address (par. n1)

See the “Network connection” chapter.

Unit of measure (par. Si)

It is possible to select the measure system of the driver:

• international (°C, K, barg);

• imperial (°F, psig).

Par. Description Def. Min. Max. UoM

Si Unit of measure: 1=°C/K/barg; 2=°F/psig 1 1 2 -

Note: the unit of measure K relates to degrees Kelvin adopted for

measuring the superheat and the related parameters.

When changing the unit of measure, all the values of the parameters saved on the driver and all the measurements read by the probes will be recalculated. This means that when changing the units of measure, control remains unaltered.

“EVD ice” +0300038EN - rel. 1.1 - 23.04.2018

ENG

Example 1: The pressure read is 20 barg this will be immediately converted to the corresponding value of 290 psig.

Example 2: The “superheat set point” parameter set to 10 K will be immediately converted to the corresponding value of 18 °F.

Access to the Mode (operating mode) parameter (par. IA)

To avoid accidental modication of the controller’s operating mode, it is possible to disable the access to the corresponding parameter.

Par. Description Def. Min. Max. UoM

IA Enable operating mode modication

0/1 = yes/ no

0 0 1 -

Number of control steps (par. U3)

Total number of steps between the valve fully closed and fully open position

Par. Description Def. Min. Max. UoM

U3 Number of valve control steps

1 / 2 = 480/960 steps

1 1 2 -

6. PROTECTORS

These are additional functions that are activated in specic situations that are potentially dangerous for the unit being controlled. They feature an integral action, that is, the action increases gradually when moving away from the activation threshold. They may add to or overlap (disabling) normal PID superheat control. By separating the management of these functions from PID control, the parameters can be set separately, allowing, for example, normal control that is less reactive yet much faster in responding when exceeding the activation limits of one of the protectors.

6.1 Protectors

The protectors are 3:

• LowSH, low superheat;

• LOP, low evaporation temperature;

• MOP, high evaporation temperature;

The protectors have the following main features:

• activation threshold: depending on the operating conditions of the

controlled unit, this is set in Service programming mode;

• integration time, which determines the intensity (if set to 0, the

protector is disabled): set automatically based on the type of main control;

• alarm, with activation threshold (the same as the protector) and

timeout (if set to 0 disables the alarm signal).

Note: The alarm signal is independent from the eectiveness of

the protector, and only signals that the corresponding threshold has been exceeded. If a protector is disabled (null integration time), the relative alarm signal is also disabled.

Each protector is inuenced by the proportional gain parameter (CP) of PID superheat control. The higher is the value of CP, the more intensely the protection will react.

Characteristics of the protectors

Protection Reaction Reset

LowSH Intense closing Immediate LOP Intense opening Immediate MOP Moderate closing Controlled

Tab. 6.a

Reaction: summary description of the type of action in controlling the valve.

Reset: summary description of the type of reset following the activation of the protector. Reset is controlled to avoid swings around the activation threshold or immediate reactivation of the protector.

Digital input

The function of the digital input can be set by parameter:

Par. Description Def. Min. Max. UoM

di DI conguration

1=Start/Stop regulation 2=Regulation backup

Start/stop regulation:

• digital input closed: control active;

• digital input open: control in standby (see the paragraph “Control states”).

Important: this setting excludes activation/deactivation of control

via the network. See the following function.

Regulation backup: if there is a network connection and communication fails, the driver checks the status of the digital input to determine whether control is active or in standby.

Note: all alarms are generated after a xed delay, as shown in the table:

Protectors Delay (s)

LowSH 300 LOP 300 MOP 600

1 1 2 -

LowSH (low superheat)

The protector is activated so as to prevent the low superheat from causing the return of liquid to the compressor.

Par. Description Def. Min. Max. U.M.

C1 LowSH protection: threshold 5(9) -5(-9) Set point

C2 LowSH protection: integration time 15 0 800 s

When the superheat value falls below the threshold, the system enters low superheat status, and the intensity with which the valve is closed is increased: the more the superheat falls below the threshold, the more intensely the valve will close. The LowSH threshold must be less than or equal to the superheat set point. The low superheat integration time indicates the intensity of the action: the lower the value, the more intense the action.

The integration time is set automatically based on the type of main control.

Low_SH_TH

Low_SH

OFF

Fig. 6.a

key:

SH Superheat A Alarm Low_SH_TH Low_SH protection threshold D Alarm delay Low_SH Low_SH protection t Time B Alarm automatic reset

superheat

K(°F)

“EVD ice” +0300038EN - rel. 1.1 - 23.04.2018

ENG

LOP (low evaporation pressure)

LOP= Low Operating Pressure The LOP protection threshold is applied as a saturated evaporation temperature value so that it can be easily compared against the technical specications supplied by the manufacturers of the compressors. The protector is activated so as to prevent too low evaporation temperatures from stopping the compressor due to the activation of the low pressure switch. The protector is very useful in units with compressors on board (especially multi-stage), where when starting or increasing capacity the evaporation temperature tends to drop suddenly. When the evaporation temperature falls below the low evaporation temperature threshold, the system enters LOP status and is the intensity with which the valve is opened is increased. The further the temperature falls below the threshold, the more intensely the valve will open. The integration time indicates the intensity of the action: the lower the value, the more intense the action.

Par. Description Def. Min. Max. U.M.

C3 LOP protection: threshold -50

C4 LOP protection: integration time 0 0 800 s

(-58)

-85 (-121)

MOP protec.: threshold

C(°F)

The integration time is set automatically based on the type of main control.

Note:

• the LOP threshold must be lower then the rated evaporation

temperature of the unit, otherwise it would be activated unnecessarily, and greater than the calibration of the low pressure switch, otherwise it would be useless. As an initial approximation it can be set to a value exactly half-way between the two limits indicated;

• the protector has no purpose in multiplexed systems (showcases)

where the evaporation is kept constant and the status of the individual electronic valve does not aect the pressure value;

• the LOP alarm can be used as an alarm to highlight refrigerant leaks by

the circuit. A refrigerant leak in fact causes an abnormal lowering of the evaporation temperature that is proportional, in terms of speed and extent, to the amount of refrigerant dispersed.

T_EVAP

LOP_TH

superheat is no longer controlled, and an increase in the superheat temperature. The protector will thus have a moderate reaction that tends to limit the increase in the evaporation temperature, keeping it below the activation threshold while trying to stop the superheat from increasing as much as possible. Normal operating conditions will not resume based on the activation of the protector, but rather on the reduction in the refrigerant charge that caused the increase in temperature. The system will therefore remain in the best operating conditions (a little below the threshold) until the load conditions change.

Par. Description Def. Min. Max. U.M.

C5 MOP protection threshold 50

C6 MOP protection integration time 20 0 800 s

(122)

Protection LOP: threshold

200 (392)

C(°F)

The integration time is set automatically based on the type of main control.

When the evaporation temperature rises above the MOP threshold, the system enters MOP status, superheat control is interrupted to allow the pressure to be controlled, and the valve closes slowly, trying to limit the evaporation temperature. As the action is integral, it depends directly on the dierence between the evaporation temperature and the activation threshold. The more the evaporation temperature increases with reference to the MOP threshold, the more intensely the valve will close. The integration time indicates the intensity of the action: the lower the value, the more intense the action.

T_EVAP

MOP_TH

MOP_TH - 1

MOP

PID

ALARM

OFF

LOP

ALARM

OFF

Fig. 6.b

Key:

T_EVAP Evaporation temperature D Alarm timeout LOP_TH Low evaporation temperature protection ALARM Alarm LOP LOP protection t Time B Automatic alarm reset

MOP (high evaporation pressure)

MOP= Maximum Operating Pressure.

The MOP protection threshold is applied as a saturated evaporation temperature value so that it can be easily compared against the technical specications supplied by the manufacturers of the compressors. The protector is activated so as to prevent too high evaporation temperatures from causing an excessive workload for the compressor, with consequent overheating of the motor and possible activation of the thermal protector. The protector is very useful in self-contained units if starting with a high refrigerant charge or when there are sudden variations in the load. The protector is also useful in multiplexed systems (showcases), as allows all the utilities to be enabled at the same time without causing problems of high pressure for the compressors. To reduce the evaporation temperature, the output of the refrigeration unit needs to be decreased. This can be done by controlled closing of the electronic valve, implying

“EVD ice” +0300038EN - rel. 1.1 - 23.04.2018

Fig. 6.c

Key:

T_EVAP Evaporation temperature MOP_TH MOP threshold PID PID superheat control ALARM Alarm MOP MOP protection t Time D Alarm timeout

Important: the MOP threshold must be greater than the rated

evaporation temperature of the unit, otherwise it would be activated unnecessarily. The MOP threshold is often supplied by the manufacturer of the compressor. It is usually between 10 °C and 15 °C.

If the closing of the valve also causes an excessive increase in the suction temperature (S2) above the set threshold – set via parameter (C7), not on the display - the valve will be stopped to prevent overheating the compressor windings, awaiting a reduction in the refrigerant charge. If the MOP protection function is disabled by setting the integral time to zero, the maximum suction temperature control is also deactivated.

Par. Description Def. Min. Max. U.M.

C7 MOP protection: disabling threshold

30 (86)

-85 (-121)

200 (392)

At the end of the MOP protection function, superheat control restarts in a controlled manner to prevent the evaporation temperature from exceeding the threshold again.

°C (°F)

ENG

7. PARAMETERS TABLE

Par. Description Def. Min. Max. UoM Type Carel Modbus® R/W Note

BASED (FISRT CONFIGURATION)

GAS

Refrigerant 3 0 40 - I 12 139 R/W

Type

Gas Type = Refrigerant

0 Custom 1 R22 15 R422D 28 R1234ze(-1...4.2 barg) 2 R134a 16 R413A 29 R455A (-1...12.8 barg) 3 R404A 17 R422A 30 R170 (0...17.3 barg) 4 R407C 18 R423A 31 R442A (-1...12.8 barg) 5 R410A 19 R407A 32 R447A (-1...12.8 barg) 6 R507A 20 R427A 33 R448A 7 R290 21 R245FA 34 R449A 8 R600 (-1...4.2 barg) 22 R407F 35 R450A (-1...4.2 barg) 9 R600a (-1...4.2 barg) 23 R32 (0...17.3 barg) 36 R452A (-1...12.8 barg) 10 R717 24 HTR01 37 R508B (-1...4.2 barg) 11 R744 (0...45 barg) 25 HTR02 38 R452B 12 R728 26 R23 39 R513A (-1...4.2 barg) 13 R1270 27 R1234yf 40 R454B 14 R417A 41 R458A

Mode Operating mode

Super

Superheat set point 11

Heat

3 = R404A

1 1 7 - I 13 140 R/W

(20)

LowSH:

protection

threshold

(99)

(°F)

A 10 9 R/W

SERVICE

P1 S1 probe measurement - -85

P2 S2 probe measurement - -85

tE Evaporation temperature (converted) - -85 (-121) 200 (392) °C(°F) A 4 3 R tS Suction temperature - -85 (-121) 200 (392) °C(°F) A 3 2 R Po Valve opening - 0 100 % A 1 0 R CP PID proportional gain 15 0 800 - A 11 10 R/W ti PID integral time 150 0 999 s I 17 144 R/W C1 LowSH protection: threshold 5(9) -5

C2 LowSH protection: integral time 15 0 800 s A 13 12 R/W C3 LOP protection: threshold -50(-

C4 LOP protection: integral time 0 0 800 s A 15 14 R/W C5 MOP protection: threshold 50

C6 MOP protection: integral time 20 0 800 s A 17 16 R/W C7 MOP protection: disabling threshold 30

C8 Low suction temperature alarm threshold -50

S1 S1 probe type

Ratiometric (OUT=0…5V)

1 = -1…4.2 barg 8 = -1…12.8 barg 2 = 0.4…9.3 barg 9 = 0…20.7 barg 3 = -1…9.3 barg 10 = 1.86…43.0 barg 4 = 0…17.3 barg 11 = Reserved 5 = 0.85…34.2 barg 12 = 0…60 barg 6 = 0…34.5 barg 13 = 0…90 barg 7 = 0…45 barg

n1 Network address 99 1 99 - I 10 137 R/W n2 Baud rate (bit/s)

0 4800, 2 stop bit, parity none 9 4800, 1 stop bit, parity even 1 9600, 2 stop bit, parity none 10 9600, 1 stop bit, parity even 2 19200, 2 stop bit, parity none 11 19200, 1 stop bit, parity even 3 4800, 1 stop bit, parity none 12 4800, 2 stop bit, parity odd 4 9600, 1 stop bit, parity none 13 9600, 2 stop bit, parity odd 5 19200, 1 stop bit, parity none 14 19200, 2 stop bit, parity odd 6 4800, 2 stop bit, parity even 15 4800, 1 stop bit, parity odd 7 9600, 2 stop bit, parity even 16 9600, 1 stop bit, parity odd 8 19200, 2 stop bit, parity even 17 19200, 1 stop bit, parity odd

(-290)

(-121)

(-9)

-85(-121) MOP

58)

LOP pro-

(122)

tection:

threshold

(86)

(-58)

-85

(-121)

-85

(-121)

3 1 11 - I 14 141 R/W

2 0 17 - I 20 147 R/W

200

(2900)

200

(392)

Superheat

set point

protection

threshold

200

(392)

200

(392)

200

(392)

barg (psig) A 6 5 R

°C(°F) A 7 6 R

(°F)

°C(°F) A 14 13 R/W

°C(°F) A 16 15 R/W

°C(°F) A 19 18 R/W

°C(°F) A 18 17 R/W

A 12 11 R/W

“EVD ice” +0300038EN - rel. 1.1 - 23.04.2018

ENG

Par. Description Def. Min. Max. UoM Type Carel Modbus® R/W Note

Si Unit of measure 1=°C/K/barg ¦ 2=°F/psig 1 1 2 - I 16 143 R/W IA Enable operating mode modication 0/1 = yes/ no 0 0 1 - I 15 142 R/W U1 Enable manual valve positioning 0/1 = no/ yes 0 0 1 - D 11 10 R/W U2 Manual valve position 0 0 999 step I 7 134 R/W U3 Valve control steps: 1/2 = 480/960 steps 1 1 2 - I 11 138 R/W U4 Valve opening at start-up (evaporator/valve capacity ratio) 50 0 100 % I 19 146 R/W Fr Firmware release - - - - A 9 8 R di DI conguration: 1=start/stop regulation; 2=backup regulation 1 1 2 - I 18 145 R/W rt Reserved 1 1 1 L1 S1 alarm: Minimum pressure -1 -85(-121) S1 alarm:

H1 S1 alarm: Maximum pressure - S1 alarm:

Min press.

Max pressure

200 (392) barg (psig) A 21 20 R/W

8. NETWORK CONNECTION

barg (psig) A 20 19 R/W

Tab. 7.a

The driver can be connected via a network connection to:

1. a computer running the VPM software, for setting the parameters

before commissioning;

2. a pCO controller, loaded with the application program;

3. a PlantVisor/PlantVisorPRO supervisor, for remote monitoring and

alarm detection.

8.1 RS485 serial conguration

n1 assigns to the controller an address for serial connection to a supervisory and/or telemaintenance system.

Par. Description Def. Min. Max. UoM

n1 Network address 1 1 99 n2 Baud rate (bit/s)

0 4800, 2 stop bit, parity none 1 9600, 2 stop bit, parity none 2 19200, 2 stop bit, parity none 3 4800, 1 stop bit, parity none 4 9600, 1 stop bit, parity none 5 19200, 1 stop bit, parity none 6 4800, 2 stop bit, parity even 7 9600, 2 stop bit, parity even 8 19200, 2 stop bit, parity even 9 4800, 1 stop bit, parity even 10 9600, 1 stop bit, parity even 11 19200, 1 stop bit, parity even 12 4800, 2 stop bit, parity odd 13 9600, 2 stop bit, parity odd 14 19200, 2 stop bit, parity odd 15 4800, 1 stop bit, parity odd 16 9600, 1 stop bit, parity odd 17 19200, 1 stop bit, parity odd

Important: all controllers connected in a serial network need to be

set with the same communication parameters.

2 0 17 -

Connect the RS485 converter to controllers and make the connections as shown in the gure. To assign the serial address, see parameter n1. See the converter technical leaets for further information.

GND

T+

CVSTDUMOR0

USB-485 Converter

T -

shield

USB

shield

VPM

EVD ice 1

EVD ice 2

EVD ice ...n

Fig. 8.a

8.2 Network connection for commissioning via PC

Warnings:

• fasten the converter properly so as to prevent disconnection;

• complete the wiring without power connected;

• keep the CVSTDUMOR0 interface cables separate from the power

cables (power supply);

• in compliance with standards on electromagnetic compatibility, a

shielded cable suitable for RS485 data transmission is used.

The RS485 converter is used to connect a computer running the VPM software to the EVD ice driver via a serial network, for commissioning the controllers. The system allows a maximum of 99 units, with a maximum network length of 500 m. Connection requires the standard accessories (RS485-USB converter, CAREL P/N CVSTDUMOR0) and a 120 Ω terminating resistor to be installed on the terminals of the last connected controller.

“EVD ice” +0300038EN - rel. 1.1 - 23.04.2018

8.3 Visual parameter manager

Go to http://ksa.carel.com and follow the instructions below. Select in sequence:

1. “Software & Support”

2. “Conguration & Updating Softwares”

3. “Parametric Controller Software”

4. “Visual Parametric Manager”

A window will open with the possibility to download two les:

1. VPM_setup_X.Y.Z.W_full.zip: complete program;

2. X.Y.Z.W_VPM_Devices_Upgrade.zip: upgrade for supported devices;

If this is the rst installation, select Setup full, otherwise Upgrade. The program installs automatically by running setup.exe.

Note: if choosing complete installation (Setup full), uninstall any

previous versions of VPM.

ENG

Programming

When opening the program, the device to be congured needs to be selected: EVD mini. The Home page then opens, oering the choice between starting a new project or opening an existing project. If using the program for the rst time, choose new project.

Fig. 8.b

The following options are then available:

1. Directly access the list of parameters saved in EEPROM: select “RS485”;

The operations are performed in real time (ONLINE mode), at the top right set network address 1 and choose the guided procedure for USB port recognition, then go to “Device setup”;

8.4 Restore default parameters

To restore the default parameter values on the controller:

1. Establish an RS485 serial connection between the computer and the

driver. The LEDs on the USB/RS485 converter will ash;

Fig. 8.e

2. Select “Update device” and:

a. Click button (A) to open the drop-down menu; b. Select the list of parameters corresponding to the controller’s

rmware version: “EVDMINI***.hex ”;

c. Click “Update” to load the parameters to the list and immediately

after restore the controller parameters to the default value.

Fig. 8.c

2. Select the model from the range based on the rmware version and list of

conguration parameters (EVDMINI0000E0X_R*.*). These operations are performed in OFFLINE mode.

The pages marked 1) can be accessed wither Online or Oine, while those marked 2) are Online only.

Fig. 8.d

The operations that can be performed on the pages marked 1) depend on the rst selection made.

Note: to access the Online help press F1.

Ref. Description Home Select operating mode

Device setup Read instant values of control

Setup summary Display the default values for the current list of parameters Custom setup See online help.

Update device Select list of parameters and

Upload rmware

Synoptic and graphs

Online Oine

parameters

then Upload to controller

Select rmware and Upload -

Overview with position of probes and probe and superheat readings in real time

Online à RS485 (rear connector) Oine à Device model

Select Load to load a list of project parameters (.hex), modify and save a new project.

Tab. 8.a

3. Go to “Device setup”: the program automatically reads the default

parameters saved on the controller.

8.5 Setup by direct copy

1. On the Home page select RS485 (rear connector);

2. Go to “Device setup”;

Fig. 8.f

Fig. 8.g

Fig. 8.h

“EVD ice” +0300038EN - rel. 1.1 - 23.04.2018

ENG

a. on the “Rapid conguration” page, set parameters “p_GAS_TYPE” =

refrigerant and “p_SUPER_MAIN_REGULATION”= type of control;

Fig. 8.i

b. on the “Conguration” page, set parameter “p_SH_SET”.

Fig. 8.j

3. Check whether there are other parameters that need to be set (see the

“Functions” chapter);

4. Finally, select “Write” to copy the parameters to the controller.

Create the conguration le

1. Select the “Device setup” page;

2. Set the parameters by double clicking, as shown in the gure:

a. on the “Rapid conguration” page, parameters “p_GAS_TYPE” =

refrigerant and “p_SUPER_MAIN_REGULATION”= type of control;

b. on the “Conguration” page, parameter “p_SH_SET”.

Fig. 8.m

3. Save the list of parameters with a new name, for example “NEW_NAME.

hex”. To load and display a list saved by the user, select “Load” and navigate to the path where the le is saved. On the other hand, to load a list of parameters supplied by CAREL, select “Load” and navigate the following path:

Fig. 8.k

8.6 Setup using conguration le

On the Home page select “Device model”.

Fig. 8.l

The setup procedure comprises three steps:

1. Create the conguration le;

2. Copy the conguration le to the controller;

3. Read the conguration le on the controller.

LoadàPluginsàCommissioning EVD mini àTXTàTXT32.

Save Load

Copy the conguration le to the controller

Select “Update device” and:

a. Click button (A) to open the drop-down menu;

NEW_NAME.hex

Fig. 8.n

b. Select the list of parameters corresponding to the project le

created: “NEW_NAME.hex”;

c. Click “Update” to UPLOAD the parameters to the controller.

8.7 Read the conguration le on the controller

1. Go to the “Home” page and select RS485 (rear connector);

2. Go to “Device setup” to read the list of parameters on the controller and

make sure the settings are correct.

“EVD ice” +0300038EN - rel. 1.1 - 23.04.2018

ENG

8.8 Variables accessible via serial connection

Parameter Description Def. Min Max Type Carel Modbus® R/W Note

Reg_status Device control status 0 0 20 I 1 128 R Machine_type_SPV Type of unit 0 0 32767 I 2 129 R Hardware_code_SPV Hardware code 0 0 32767 I 3 130 R EEV_Positions_steps Valve position 0 0 999 I 4 131 R Protection_status Protector status 0 0 5 I 5 132 R Sh_unit_power_percent Cooling capacity 0 0 100 I 6 133 R/W Man_posit_steps Manual valve position 0 0 999 I 7 134 R/W par. U2 Start_func_test Functional test input variable 0 0 30000 I 8 135 R/W Func_test_2 Functional test generic variable 0 -32768 32767 I 9 136 R/W Net_address LAN serial address 99 1 99 I 10 137 R/W par. n1 EEV_steps_doubling Double valve steps 1 1 2 I 11 138 R/W par. U3 Gas_type Refrigerant 3 1 23 I 12 139 R/W Gas Type = refrig. Super_main_regulation Main control 1 0 6 I 13 140 R/W Operating mode Super_S1_probe_model Probe S1 3 1 11 I 14 141 R/W par. S1 Inhibit_mode_setting Enable mode parameter setting 0 0 1 I 15 142 R/W par. IA Unity_measure Unit of measure 1 1 2 I 16 143 R/W par. Si PID_Ti PID: integral time 150 0 999 I 17 144 R/W par. ti Par_Digin1_Cong Digital input conguration

Start_eev_opening_ratio Valve position at start-up 50 0 100 I 19 146 R/W par. U4 Net setting Baud rate 2 0 17 I 20 147 R/W par. n2 Reset Default (*) Reset with default parameters 0 |-32768 32767 I 21 148 R/W Ultracella signature Riservato 0 |-32768 32767 I 22 149 R/W Control type Control type 1 1 9 I 23 150 R Gas custom dew_a_h Dew a high -288 -32768 32767 I 24 151 R/W Gas custom dew_a_l Dew a low -15818 -32768 32767 I 25 152 R/W Gas custom dew_b_h Dew b high -14829 -32768 32767 I 26 153 R/W Gas custom dew_b_l Dew b low 16804 -32768 32767 I 27 154 R/W Gas custom dew_c_h Dew c high -11664 -32768 32767 I 28 155 R/W Gas custom dew_c_l Dew c low 16416 -32768 32767 I 29 156 R/W Gas custom dew_d_h Dew d high -23322 -32768 32767 I 30 157 R/W Gas custom dew_d_l Dew d low -16959 -32768 32767 I 31 158 R/W Gas custom dew_e_h Dew e high -16378 -32768 32767 I 32 159 R/W Gas custom dew_e_l Dew e low 15910 -32768 32767 I 33 160 R/W Gas custom dew_f_h Dew f high -2927 -32768 32767 I 34 161 R/W Gas custom dew_f_l Dew f low -17239 -32768 32767 I 35 162 R/W Net_alarm Network alarm 0 0 1 D 1 0 R all. E6 Emergency_closing_alarm Mains power failure 0 0 1 D 2 1 R all. E5 S1_alarm Probe S1 alarm 0 0 1 D 3 2 R all. A1 S2_alarm Probe S2 alarm 0 0 1 D 4 3 R all. A2 Low_sh_alarm Low_SH alarm 0 0 1 D 5 4 R all. E3 LOP_alarm LOP alarm 0 0 1 D 6 5 R all. E2 MOP_alarm MOP alarm Low_suct_alarm Low suction temperature alarm 0 0 1 D 8 7 R all. E4 Eeprom_alarm EEPROM damaged 0 0 1 D 9 8 R all. EE Digin1_status Digital input status 0 0 1 D 10 9 R Manual_posit_enable Enable manual valve 0 0 1 D 11 10 R/W par. U1 Incomplete closing alarm Emergency closing not completed 0 0 1 D 12 11 R/W all. E8 Battery alarm Battery alarm 0 0 1 D 13 12 R EVD_CAN_GO EVD regulation enable 0 0 1 D 14 13 R/W S1_Alarm_enable S1 Probe enable 0 0 1 D 15 14 R/W S2_Alarm_enable S2 Probe enable 0 0 1 D 16 15 R/W EEV_Position_percent Valve opening 0 0 100 A 1 0 R par. Po SH_SH Superheat 0 -5(-9) 55(99) A 2 1 R Sh_Suct_temp Suction temperature 0 -85(-121) 200(392) A 3 2 R par. tS Sh_Evap_temp Evaporation temperature 0 -85(-121) 200(392) A 4 3 R Sh_Evap_pres Evaporation pressure 0 -20(-290) 200(2900) A 5 4 R S1_Value Probe S1 reading 0 -85(-290) 200(2900) A 6 5 R par. P1 S2_Value Probe S2 reading 0 -85(-121) 200(392) A 7 6 R par. P2 Positioning_mode_volt 0 to 10 V input 0 0 10 A 8 7 R Firm_release Firmware version 0 0 800 A 9 8 R par. Fr SH_Set Superheat set point 11 Low_Sh_

PID_Kp PID: proportional gain 15 0 800 A 11 10 R/W par. CP Low_sh_threshold Low superheat: threshold 5 -5

Low_sh_Ti Low superheat: integral time 15 0 800 A 13 12 R/W par. C2 Lop_threshold LOP: threshold -50(-58) -85(-121) MOP_th-

Lop_Ti LOP: integral time 0 0 800 A 15 14 R/W par. C4 MOP_Threshold MOP: threshold 50 LOP_th-

(*) set to 1073 to reset the parameters to default values

MOP_Ti MOP: integral time 20 0 800 A 17 16 R/W par. C6 Low_Suct_alarm_threshold Low suction temp. alarm threshold -50(-58) -85(-121) 200(392) A 18 17 R/W par. C8 Mop_Inhibition_threshold MOP: disabling threshold 30 (86) -85(-121) 200(392) A 19 18 R/W Par_S1_Alarm_threshold_

low

Par_S1_Alarm_threshold_ high

Tctrl_rev_set Reserved - -85(-121) 200(392) A 22 21 R/W

1=Start/stop control 2=Control backup

PressureS1: alarm MIN value -1 -85(-290) Par_S1_

PressureS1: alarm MAX value 9.3 Par_S1_

1 1 2 I 18 145 R/W

0 0 1 D 7 6 R all. E1

Threshold

(-9)

reshold

Alarm_th-

reshold_low

55 A 10 9 R/W Super heat =

SH set point A 12 11 R/W par. C1

reshold

200

(392)

Alarm_th-

reshold_high

200(2900) A 21 20 R/W

A 14 13 R/W par. C3

A 16 15 R/W par. C5

A 20 19 R/W

Superheat set point

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ENG

Parameter Description Def. Min Max Type Carel Modbus® R/W Note

Pctrl_rev_set Reserved - -20(-290) 200(2900) A 23 22 R/W SH_actual_set Reserved 0 -40(-72) 180(324) A 24 23 R SH_Set_smooth_line Superheat Setpoint-Oset for smooth line 0 -55(-99) 55(99) A 25 24 R/W S1_value_remote Reserved 0 -20(-290) 200(2900) A 26 25 R/W

8.9 Control states

The electronic valve controller can have six dierent control states, each of which may correspond to a specic phase in the operation of the refrigeration unit and a certain status of the driver-valve system. The states are as follows:

• forced closing: initialisation of the valve position when switching the

instrument on;

• standby: no temperature control, unit OFF (at temp.);

• wait: opening of the valve before starting control, also called pre-

positioning, when powering the unit on;

• control: eective control of the electronic valve, unit ON;

• positioning: step-change in the valve position, corresponding to the

start of control when the cooling capacity of the controlled unit varies (only EVD connected to a pCO);

• stop: of control with closing of the valve, corresponds to the end of

temperature control of the refrigeration unit, unit OFF (at temp.).

Forced closing

Forced closing is performed after the driver is powered on and corresponds to the typical number of closing steps for CAREL E2V and E3V unipolar valves. This is used to realign the valve to the physical position corresponding to completely closed. The driver and the valve are then ready for control and both aligned at 0 (zero). At power-on, rst a forced closing is performed, and then the standby phase starts. The valve is also closed in the event of a mains power failure if the Ultracap module is connected. In this case, the “Forced valve closing not completed” parameter is set to 1. On restarting, if the valve forced closing procedure is not completed successfully:

1. the Master programmable controller (pCO) will check the value of the

parameter, and if equal to 1 will decide the best strategy to adopt, based on the application;

2. on restarting the driver positions the valve as explained in the paragraph

“Pre-positioning/start control”. The parameter is set to 0 (zero) by the Master controller (e.g. pCO), or alternatively by pressing the PRG/ Set button on the keypad. Once the parameter has been set to 1, the driver sets it back to 0 (zero) only if an emergency forced closing procedure is completed successfully.

Note: lthe user can only select the resolution of the valve control

signal: 480 or 960 steps.

Par. Description Def. Min. Max. UoM

U3 Valve control steps: 1 / 2 = 480/ 960 steps 1

1 2 -

The driver calculates the valve opening based on the required capacity:

If required capacity is 100%:

Opening (%)= (Valve opening at start-up);

If required capacity is less than 100% (capacity control):

Opening (%)= (Valve opening at start-up) x (Current unit cooling capacity), where the current unit cooling capacity is sent to the driver via RS485 by the pCO controller. If the driver is stand-alone, this is always equal to 100%.

Notes:

• this procedure is used to anticipate the movement and bring the valve

signicantly closer to the operating position in the phases immediately after the unit is powered on;

• if there are problems with liquid return after the refrigeration unit starts

or in units that frequently switch on-o, the valve opening at start-up must be decreased. If there are problems with low pressure after the refrigeration unit starts, the valve opening must be increased.

Wait

When the calculated position has been reached, regardless of the time taken (this varies according to the type of valve and the objective position), there is a constant 5 second delay before the actual control phase starts. This is to create a reasonable interval between standby, in which the variables have no meaning, as there is no ow of refrigerant, and the eective control phase.

Control

The control request can be received by the closing of the digital input or via network (RS485). The solenoid or the compressor are activated when the valve, following the pre-positioning procedure, has reached the calculated position. The following gure represents the sequence of events for starting control of the refrigeration unit.

OFF

Tab. 8.b

Standby

Standby corresponds to a situation of rest in which no signals are received to control the electronic valve: it is closed and manual positioning can be activated. This status is normally set on the driver when the refrigeration unit is shutdown manually (e.g. from the supervisor) or when reaching the control set point. It can also occur when opening the digital input (which involves closing the valve) or in the event of a probe alarm. In general, it can be said that the electronic valve driver is in standby when the compressor stops or the control solenoid valve closes.

Pre-positioning/start control

If during standby a control request is received, before starting control the valve is moved to a precise initial position. Internally, the pre-positioning time is set at 6 s and represents the time that the valve is held in a xed position. By default the valve is opened 50 % when starting (from digital input), so as to minimise the movement needed to reach the correct position.

Par. Description Def. Min. Max. UoM

U4 Valve opening at start-up 50

This parameter should be set based on the ratio between the rated cooling capacity of the evaporator and the valve (e.g. rated evaporator cooling capacity: 3kW, rated valve cooling capacity: 10kW, valve opening = 3/10 = 33%).

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0 100 %

Key:

A Control request T1 Pre-positioning time P Pre-positioning W Wait (wait) S Standby t Time R Control

Positioning (change cooling capacity)

This control status is only valid for controllers connected to the pCO via RS485. If there is a change in unit cooling capacity of at least 10%, sent from the pCO via RS485, the valve is positioned proportionally. In practice, this involves repositioning starting from the current position in

OFF

T1 W

Fig. 8.o

ENG

proportion to how much the cooling capacity of the unit has increased or decreased in percentage terms. When the calculated position has been reached, regardless of the time taken, there is a constant 5 second delay before the actual control phase starts.

Note: if information is not available on the variation in unit cooling

capacity, this will always be considered as operating at 100% and therefore the procedure will never be used. In this case, the PID control must be more reactive (see the chapter on Control) so as to react promptly to variations in load that are not communicated to the driver.

OFF

T3 W

Fig. 8.p

Key:

Control request R Control

Change in capacity T3 Repositioning time

Repositioning t Time

Wait

• recover physical valve position: recover physical valve steps when fully

opened or closed;

• unblock valve: forced valve movement if the driver considers it to be

blocked.

Manual positioning

Manual positioning can be activated at any time during the standby or control phase. Manual positioning, once enabled, is used to freely set the position of the valve using the corresponding parameter. Control is placed on hold, all the system and control alarms are enabled, however neither control nor the protectors can be activated. Manual positioning thus has priority over any driver state/protector.

Par. Description Def. Min. Max. UoM

U1 Enable manual valve posit. 0/1=yes/no 0 U2 Manual valve position 0

Notes:

0 1 0 999

step

1. the manual positioning status is NOT saved when restarting after a

power failure.

2. in for any reason the valve needs to be kept stationary after a power

failure, proceed as follows:

• remove the valve stator;

• set the PID proportional gain =0. The valve will remain stopped at

the initial opening position, set by corresponding parameter

Retrieve physical valve position

This procedure is necessary as the stepper motor intrinsically tends to lose steps during movement. Given that the control phase may last continuously for several hours, it is probable that from a certain time on the estimated position sent by the valve driver does not correspond exactly to the physical position of the movable element. This means that when the driver reaches the estimated fully closed or fully open position, the valve may physically not be in that position. The “Synchronisation” procedure allows the driver to perform a certain number of steps in the suitable direction to realign the valve.

Stop/end control

The stop procedure involves closing the valve from the current position until reaching 0 steps, plus a further number of steps so as to guarantee complete closing. Following the stop phase, the valve returns to standby.

OFF

Fig. 8.q

Key:

Control request R Control

Standby T4 Stop position time

Stop t Time

8.10 Special control states

As well as normal control status, the driver can have three special states related to specic functions:

• manual positioning: this is used to interrupt control so as to move the

valve, setting the desired position;

Note: realignment is in intrinsic part of the forced closing procedure and

is activated whenever the driver is stopped/started and in the standby phase.

Unblock valve

This procedure is only valid when the driver is performing superheat control. Unblock valve is an automatic safety procedure that attempts to unblock a valve that is supposedly blocked based on the control variables (superheat, valve position). The unblock procedure may or may not succeed depending on the extent of the mechanical problem with the valve. If for 10 minutes the conditions are such as to assume the valve is blocked, the procedure is run a maximum of 5 times. The symptoms of a blocked valve do not necessarily mean a mechanical blockage. They may also represent other situations:

• mechanical blockage of the solenoid valve upstream of the electronic

valve (if installed);

• electrical damage to the solenoid valve upstream of the electronic valve;

• blockage of the lter upstream of the electronic valve (if installed);

• electrical problems with the electronic valve motor;

• electrical problems in the driver-valve connection cables;

• incorrect driver-valve electrical connection;

• electronic problems with the valve control driver;

• secondary uid evaporator fan/pump malfunction;

• insucient refrigerant in the refrigerant circuit;

• refrigerant leaks;

• lack of subcooling in the condenser;

• electrical/mechanical problems with the compressor;

• processing residues or moisture in the refrigerant circuit.

Note: the valve unblock procedure is nonetheless performed in each

of these cases, given that it does not cause mechanical or control problems. Therefore, also check these possible causes before replacing the valve.

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9. ALARMS

9.1 Types of alarms

There are two types of alarms:

• system: EEPROM, probe and communication;

• control: low superheat, LOP, MOP, low suction temperature.

The activation of the alarms depends on the setting of the threshold and activation delay parameters. The EEPROM unit parameters and operating parameters alarm always shuts down the controller and cannot be reset. All the alarms are reset automatically, once the causes are no longer present, except for the “Emergency closing not completed” alarm, which requires manual reset.

9.2 Probe alarms

The probe alarms are part of the system alarms. When the value measured by one of the probes is outside of the range of measurement, an alarm is activated. The alarm limits correspond to the range of measurement. In the event of a probe alarm, the driver closes the valve, regardless of digital input status, until the error is no longer present.

Example: the display shows probe alarms A1 and A2 in sequence. The superheat value has exceeded the maximum limit allowed, and this is indicated by the two top segments.

GAS Type

Mode

Super Heat

GAS Type

Mode

Super Heat

Fig. 9.a

GAS Type

Mode

Super Heat

Minimum and maximum superheat limits

If a probe alarm occurs, it may be due to the superheat value exceeding the allowed display range -5…55 K (-9 to 99°F). The display therefore shows the probe alarm code (A1/A2) and:

1. if the superheat value is less than -5K, the display shows the two bottom

segments;

2. if the superheat value is higher than 55K, the display shows the two top

segments.

GAS Type

Mode

Super Heat

1 2

GAS Type

Mode

Super Heat

Fig. 9.b

9.3 Control alarms

These are alarms that are only activated during control.

Low suction temperature alarm

The low suction temperature alarm is not linked to any protection function. It features a threshold and a xed delay (300 seconds), and is useful in the event of probe or valve malfunctions to protect the compressor using the relay to control the solenoid valve or to simply signal a possible risk. In fact, incorrect measurement of the evaporation pressure or incorrect conguration of the type of refrigerant may mean the superheat calculated is much higher than the actual value, causing an incorrect and excessive opening of the valve. A low suction temperature measurement may in this case indicate probable ooding of the compressor, with corresponding alarm signal. The alarm is reset automatically, with a xed dierential of 3°C above the activation threshold.

Par. Description Def. Min. Max. UoM

C8 Low suction temperature

alarm threshold

-50 (-58)

-85 (-121)

200 (392)

°C(°F)

9.4 Valve emergency closing procedure

The following description only applies if EVD ice is connected to the Ultracap module. In the event of a power failure, EVD ice can provide emergency closing of the valve, thus preventing any refrigerant from owing to the compressor. In this situation, the driver generates two alarms: E8 and E5. If the procedure concludes successfully (the valve closes completely), alarm E8 is cleared, however alarm E5 continues until the Ultracap module is able to power on the driver.

• E8: failed emergency closing (incomplete closing alarm). Active

during the emergency closing stage and until the valve closes completely, after which alarm E8 is cleared. If the closing procedure is not completed (e.g. because the Ultracap module does not have enough charge), when next restarting the controller, the user must manually reset the alarm (pressing the PRG/SET button or setting the corresponding parameter to zero via serial connection);

• E5: emergency closing (emergency force closing alarm). This depends

on a controller power failure and indicates that the emergency procedure is in progress.

Notes:

• if the voltage measured falls below a certain threshold, the controller,

connected to the Ultracap module, can start the valve emergency closing procedure;

• during the valve emergency closing procedure, the display is switched

o to save energy (therefore the alarms may not be shown on the display, or only shown for a brief instant);

• if power returns during the closing procedure, alarms E8 and E5 are

reset and closing is completed in any case.

9.5 Network alarm

The digital input conguration parameter can only be set to control backup from the supervisor. If there is a communication error between the pCO controller and driver, the digital input status determines whether to continue control (input closed = the valve remains in the current position) or stop (input open).

Protector alarms

The alarms corresponding to the LowSH, LOP and MOP protectors are only activated during control when the corresponding activation threshold is exceeded, and only when the delay time dened by the corresponding parameter has elapsed. If a protector is not enabled (integral time= 0 s), no alarm will be signalled. If before the expiry of the delay, the protector control variable returns back inside the corresponding threshold, no alarm will be signalled.

Note: this is a likely event, as during the delay, the protection

function will have an eect.

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9.6 Alarm table

Alarm Red LED Cause of the alarm Reset Eects on control Checks / Solutions

A1 ashes Probe S1 faulty or set alarm range exceeded automatic Valve closed Check the probe connections. A2 ashes Probe S2 faulty or set alarm range exceeded automatic Valve closed Check the probe connections. E1 ashes MOP protection activated automatic Protection action already in progress Check parameter “MOP protection: threshold” E2 ashes LOP protection activated automatic Protection action already in progress Check parameter “LOP protection: threshold” E3 ashes LowSH protection activated automatic Protection action already in progress Check parameter “LowSH protection: threshold” E4 ashes Low suction temperature automatic No eect Check the threshold parameter. E5 ashes Emergency closing automatic Valve closed E6 ashes Network error automatic Control based on DI Check the wiring and that the pCO is on and

E7 ashes Ultracap module powered at low voltage or low

E8 ashes Emergency closing not completed Manual Valve closed Press PRG/Set or set the corresponding supervisor

EE on

steady

charge

EEPROM operating and/or unit parameters damaged

automatic No eect Check the wiring, the power supply and that the

Replace the driver / Contact service

Total shutdown Replace the driver/Contact service

10. TROUBLESHOOTING

The following table lists a series of possible malfunctions that may occur when starting and operating the driver and the electronic valve. These cover the most common problems and are provided with the aim of oering an initial response for resolving the problem.

PROBLEM CAUSE SOLUTION

The superheat value measured is incorrect

Liquid returns to the compressor during control

Liquid returns to the compressor only after defrosting (for multiplexed cabinets only)

Liquid returns to the compressor only when starting the controller (after being OFF)

The superheat value swings around the set point with an amplitude greater than 4°C

In the start-up phase with high evaporator temperatures, the evaporation pressure is high

The probe does not measure correct values Check that the pressure and the temperature measured are correct and that the probe position

The type of refrigerant set is incorrect Check and correct the type of refrigerant parameter. The superheat set point is too low Increase the superheat set point. Initially set it to 11 K and check that there is no longer return of

Low superheat protection ineective If the superheat remains low for too long with the valve that is slow to close, increase the low su-

Stator broken Enable the manual positioning and check the opening and closure of the valve. Valve stuck open Check if the superheating is always low (<2 °C) with the valve position permanently at 0 steps. If

The “valve opening at start-up” parameter is too high on many cabinets in which the control set point is often reached (for multiplexed cabinets only)

The superheat temperature measured by the driver after defrosting and before reaching operating conditions is very low for a few minutes

The superheat temperature measured by the driver does not reach low values, but there is still return of liquid to the compressor rack

Many cabinets defrosting at the same time Stagger the start defrost times. If this is not possible, if the conditions in the previous two points

The valve is signicantly oversized Replace the valve with a smaller equivalent. The “valve opening at start-up” parameter is set

too high

The condensing pressure swings Check the controller condenser settings, giving the parameters “blander” values (e.g. increase the

The superheat swings even with the valve set in manual control (in the position corresponding to the average of the working values)

The superheat does NOT swing with the valve set in manual control (in the position corresponding to the average of the working values)

The superheat set point is too low Increase the superheat set point and check that the swings are reduced or disappear. Initially set

MOP protection disabled or ineective Activate the MOP protection by setting the threshold to the required saturated evaporation tem-

Refrigerant charge excessive for the system or extreme transitory conditions at start-up (for cabinets only).

is correct. Check the selection of pressure probe. Check the correct probe electrical connections.

liquid. Then gradually reduce the set point, always making sure there is no return of liquid.

perheat threshold and/or decrease the low superheat integration time. Initially set the threshold 3 °C below the superheat set point, with an integration time of 3-4 seconds. Then gradually lower the low superheat threshold and increase the low superheat integration time, checking that there is no return of liquid in any operating conditions.

so, set the valve to manual control and close it completely. If the superheat is always low, check the electrical connections and/or replace the valve.

Decrease the value of the “Valve opening at start-up” parameter on all the utilities, making sure that there are no repercussions on the control temperature.

Check that the LowSH threshold is greater than the superheat value measured and that the corresponding protection is activated (integration time >0 s). If necessary, decrease the value of the integration time.

Set more reactive parameters to bring forward the closing of the valve: increase the proportional factor to 30, increase the integration time to 250 s.

are not present, increase the superheat set point and the LowSH thresholds by at least 2 °C on the cabinets involved.

Check the calculation in reference to the ratio between the rated cooling capacity of the evaporator and the capacity of the valve; if necessary, lower the value.

proportional band or increase the integration time). Note: the required stability involves a variation within +/- 0.5 bars. If this is not eective or the settings cannot be changed, adopt electronic valve control parameters for perturbed systems

Check for the causes of the swings (e.g. low refrigerant charge) and resolve where possible.

As a rst approach , decrease (by 30 to 50 %) the proportional factor. Subsequently try increasing the integration time by the same percentage. In any case, adopt parameter settings recommended for stable systems.

13 °C, then gradually reduce the set point, making sure the system does not start swinging again and that the unit temperature reaches the control set point.

perature (high evaporation temperature limit for the compressors) and setting the MOP integration time to a value above 0 (recommended 4 seconds). To make the protection more reactive, decrease the MOP integration time.

Apply a “soft start” technique, activating the utilities one at a time or in small groups. If this is not possible, decrease the values of the MOP thresholds on all the utilities.

operating

minimum recharge time has elapsed

variable to 0

Tab. 9.a

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ENG

PROBLEM CAUSE SOLUTION

In the start-up phase the low pressure protection is activated (only for selfcontained units)

The unit switches o due to low pressure during control (only for self-contained units)

The cabinet does not reach the set temperature, despite the value being opened to the maximum (for multiplexed cabinets only)

The cabinet does not reach the set temperature, and the position of the valve is always 0 (for multiplexed cabinets only)

The “Valve opening at start-up” parameter is set too low

The driver in RS485 network does not start control and the valve remains closed

The driver in stand-alone conguration does not start control and the valve remains closed

LOP protection disabled Set a LOP integration time greater than 0 s. LOP protection ineective Make sure that the LOP protection threshold is at the required saturated evaporation temperature

Solenoid blocked Check that the solenoid opens correctly, check the electrical connections. Insucient refrigerant Check that there are no bubbles in the sight glass upstream of the expansion valve. Check that

The valve is connected incorrectly (rotates in reverse) and is open

Stator broken or connected incorrectly Disconnect the stator from the valve and the cable and measure the resistance of the windings

Valve stuck closed Use manual control after start-up to completely open the valve. If the superheat remains high,

LOP protection disabled Set a LOP integration time greater than 0 s. LOP protection ineective Make sure that the LOP protection threshold is at the required saturated evaporation temperature

Solenoid blocked Check that the solenoid opens correctly, check the electrical connections and the operation of

Insucient refrigerant Check that there are no bubbles of air in the liquid indicator upstream of the expansion valve.

The valve is signicantly undersized Replace the valve with a larger equivalent. Stator broken Enable the manual positioning and check the opening and closure of the valve. Valve stuck closed Use manual control after start-up to completely open the valve. If the superheat remains high,

Solenoid blocked Check that the solenoid opens correctly, check the electrical connections and the operation of the relay. Insucient refrigerant Check that there are no bubbles of air in the liquid indicator upstream of the expansion valve.

The valve is signicantly undersized Replace the valve with a larger equivalent. Stator broken Enable the manual positioning and check the opening and closure of the valve.

Valve stuck closed Use manual control after start-up to completely open the valve. If the superheat remains high,

The driver in RS485 network does not start control and the valve remains closed

The driver in stand-alone conguration does not start control and the valve remains closed

Check the calculation in reference to the ratio between the rated cooling capacity of the evaporator and the capacity of the valve; if necessary increase the value.

Check the serial connection. Check that the pCO application connected to the driver (where featured) correctly manages the driver start signal. Check that the driver is NOT in stand-alone mode.

Check the connection of the digital input. Check that when the control signal is sent that the input is closed correctly. Check that the driver is in stand-alone mode.

(between the rated evaporation temperature of the unit and the corresponding temperature at the calibration of the low pressure switch) and decrease the value of the LOP integration time.

the subcooling is suitable (greater than 5 °C); otherwise charge the circuit. Check the movement of the valve by placing it in manual control and closing or opening it com-

pletely. One complete opening must bring a decrease in the superheat and vice-versa. If the movement is reversed, check the electrical connections.

using an ordinary tester. The resistance of both should be around 36 ohms. Otherwise replace the stator. Finally, check the electrical connections of the cable to the driver (see paragraph 5.1).

check the electrical connections and/or replace the valve.

(between the rated evaporation temperature of the unit and the corresponding temperature at the calibration of the low pressure switch) and decrease the value of the LOP integration time.

the control relay.

Check that the subcooling is suitable (greater than 5 °C); otherwise charge the circuit.

replace the valve body.

Check that the subcooling is suitable (greater than 5 °C); otherwise charge the circuit.

replace the valve body. Check the network connections. Check that the pCO application connected to the driver (where fe-

atured) correctly manages the driver start signal. Check that the driver is NOT in stand-alone mode. Check the connection of the digital input. Check that when the control signal is sent that the

input is closed correctly. Check that the driver is in stand-alone mode.

Tab. 10.a

11. TECHNICAL SPECIFICATIONS

Power supply 115…230 Vac (+10/-15%) 50/60 Hz Power input max (W) 15 Emergency power supply 13 Vdc +/-10% ( Driver Unipolar valve Valve connection 6-wire cable AWG 18/22 type, Lmax=1m Digital input connection digital input 230 V optoisolated. Closing current: 10 mA

Probe

Lmax=10m for residential/industrial environments, 2m for domestic environments

S1 ratiometric pressure probe (0…5 V):

Resolution 0,1 % fs Measurement error: 2% fs max; 1% typical

S2 low temperature NTC:

10kΩ a 25°C, -50T90°C

RS485 serial connection Modbus, Lmax=500m, shielded cable, earth connection in both side of shielded-cable Assembly with screw Dimensions LxHxW= 93 x 230 x 41 mm Operating conditions -30T40°C (don’t use EVDIS* lower than -20°C); <90% U.R. non-condensing Storage conditions -35T60°C (don’t store EVDIS* lower than -30°C), humidity 90% U.R. non-condensing Index of protection IP65/IP67

Measurement error: 1°C in the range -50T50°C; 3°C in the range +50T90°C

Environmental pollution 2 Temperature for glow wire test

850°C

Immunity against voltage surges Category II Class of insulation II Software class and structure A Conformity

Electrical safety: EN 60730-1, UL 60730-1, UL 60730-2-9

Electromagnetic compatibility: EN 61000-6-1, EN 61000-6-2, EN 61000-6-3, EN 61000-6-4 EN61000-3-2, EN55014-1, EN61000-3-3

If it is installed the optional Ultracap module for EVD ice, for EVDM011R1*/EVDM011R2*)

Tab. 11.a

“EVD ice” +0300038EN - rel. 1.1 - 23.04.2018

CAREL INDUSTRIES HeadQuarters

Via dell’Industria, 11 - 35020 Brugine - Padova (Italy) Tel. (+39) 049.9716611 - Fax (+39) 049.9716600 e-mail: carel@carel.com - www.carel.com

Agenzia / Agency:

“EVD ice” +0300038EN - rel. 1.1 - 23.04.2018

Carel EVD ice User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual