Danfoss can accept no responsibility for possible errors in
catalogues, brochures and other printed material. Danfoss
reserves the right to alter its products without notice. This
also applies to products already on order provided that
such alterations can be made without subsequential
changes being necessary in specifications already agreed.
All trademarks in this material are property of the
respective companies. Danfoss and the Danfoss logotype
are trademarks of Danfoss A/S. All rights reserved.
Coverage
1.1.2
This instruction covers 3 different drive sizes with single
phase 208-240 V power supply matching compressor sizes
for
-13 kW/3 t cooling capacity
-16 kW/4 t cooling capacity
-20 kW/5 t cooling capacity
from software version 1.09.
1.2
Safety Instructions
1.3 Approvals
The drive has been designed/approved in accordance with
the following standards:
SafetyUL/EN 60335-1, 60335-2-34 (UL 984)
HouseholdUL/EN 60730
IndustrialEN 61800-3 (frequency converter standard)
SoftwareUL 1998 cl. B
PolymericsUL 746 C
EMCWith ferrite: EN 55011 cl. A, EN 55014
HarmonicsEN 61000-3-12, IEEE 519-1992
SurgeEN 61642-12
ImmunityEN 61000-6
TransientEN 61000-4
CorrosionUL 50E, ISO 9223, EN 61000-5-1, ASTM B117
Environment IEC 60721-3-3 cl. 3K4
EnclosureNEMA 250-2003
Table 1.1 Standards Complied to
The equipment complies with the flicker requirement according to
IEC/EN61000-3-11 at 230 V nominal voltage under the condition that
the service current capacity is
permissible system impedance Z
≥
100 A per phase or a maximum
= 0.1892
MAX
Ω
1.2.1 High Voltage Warning
WARNING
The voltage of the variable speed drive is dangerous
whenever it is connected to mains. Incorrect installation of
the variable speed drive may cause damage to the
equipment, serious injury or death. Consequently, it is
essential to comply with the instructions in this manual as
well as local and national rules and safety regulations.
1.2.2 Safety Instructions
Make sure the drive is properly connected to
•
earth
Do not remove the mains connector or motor
•
(compressor) connector while the drive is
connected to power
Protect personnel against supply voltage
•
Protect the variable speed drive against over-
•
current according to national and local
regulations
4MG10V402 - VLT® is a registered Danfoss trademark
130ZB121.10
IP00/CHASSIS -25
C/ -13 F to 52 C/125 F
PERFORMER
MADE IN DENMARK
R
CDS801 Variable Speed Drive
P/N: 176L7002 S/N: 010199D082
20 kW/5 TR cooling capacity
IN: 1x208-230V 50-60Hz 33A 6,7 kW
OUT: 3x270V 45-210Hz 33A
VSD
oooo
CAUTION:
See manual before use.
Lire le manual avant utilisation
WARNING:
Stored charge, wait 5 min. before service.
Energia aimacenada, asperar 5 min. para descaega antes de lisar.
Touching the electrical parts may be fatal - even after the
equipment has been disconnected from mains.
Also make sure that other voltage inputs have been
disconnected.
Be aware that there may be high voltage on the DC link
even when the LED is turned off.
Before touching any potentially live parts of the drive, wait
at least 1 minute.
CAUTION
Leakage Current
The earth leakage current from the variable speed drive
exceeds 3.5 mA. Grounding and bounding shall comply
with UL 1995/NEC.
Residual Current Device
This product can cause a D.C. current in the protective
earth, only an RCD of Type B (time delayed) shall be used
in the supply side of this product. See also Application Noteon RCD, MN90G.
Protective earthing of the drive and the use of RCDs must
always follow national and local regulations.
WARNING
Installation in high altitudes:
At altitudes above 6000 ft (2000 m), contact Danfoss
regarding SELV.
11
1.6 Before Commencing Repair Work
1.Disconnect the variable speed drive from mains
(flip the circuit breaker or pull fuses).
2.Wait for at least 5 minutes for discharge of the
DC-link capacitors.
3.Remove motor (compressor) cable.
1.7 ESD Precautions
A variable speed drive is a sensible electronic device.
Electrostatic discharge (ESD) can cause a malfunction or
destroy the frequency converter. Do not touch
components on the printed circuit board (PCB). When
handling the drive make sure that necessary ESD
precautions are taken, i.e. wearing wrist straps, using antistatic mats etc.
1.8 Product Identification
A product identification label is placed on the drive
chassis. It carries the ordering code i.e. 76L7002. The last 3
digits of the numeric string indicate the production date,
i.e. 062 means week 6 in 2012. Do not remove the identification label from the drive (loss of warranty).
Avoid unintended start
While the variable speed drive is connected to mains, the
motor (compressor) can be started/stopped using serial
communication commands.
-Disconnect the frequency converter from mains
whenever personal safety considerations make it
necessary to avoid unintended start.
1.5
Disposal Instruction
Equipment containing electrical
components may not be disposed
together with domestic waste.
It must be separately collected with
electrical and electronic waste according
to local and valid legislation.
Illustration 1.1 Product Identification Label
1.9 Unpacking the Drive
NOTE
To avoid damage to the drive caused by electrostatic
discharge, people handling the drive should wear wrist
traps for proper grounding at all time!
MG10V402 - VLT® is a registered Danfoss trademark5
VSDVariable speed drive
VFDVariable frequency drive, also used instead of VSD
EMC Electromagnetic compatibility
RCDResidual current device
SELV Safety extra low voltage
ESDElectrostatic discharge
PCBPrinted circuit board
AWG American wire gauge
EEVElectronic expansion valve
RTURemote terminal unit
OEM Original equipment manufacturer
ACAir-conditioning
HPHeat pump
RLARated load amperage
AOC Application oriented controller
MOC Motor oriented controller
Table 1.2 Abbreviations
6MG10V402 - VLT® is a registered Danfoss trademark
The drive can be installed horizontally (see Illustration 2.4)
or vertically (see Illustration 2.3) on any plain surface with
the PCB pointing towards the surface. Typically, the 6
mounting holes in the side flaps of the chassis are used for
installation.
For vertical installation, the upper two mounting holes can
be used as suspension holes.
NOTE
If the drive is installed on a sheet metal surface, the
clearance between the drive PCB and the mounting
surface must be observed. As a minimum, sheet metal
gauge 22, 33/1000 inch or 1 mm should be used. If
electrical contact with the mounting surface can not be
avoided an additional isolation foil should be used.
22
NOTE
For outdoor units, do not install the drive horizontally with
the PCB in the top or bottom. Water condensing on the
PCB cannot be properly drained.
Illustration 2.3 Horizontal Orientation
Illustration 2.4 Vertical Orientation
MG10V402 - VLT® is a registered Danfoss trademark9
175ZB038.12
Mechanical Installation
To avoid insufficient cooling, do not install the drive with
the cooling fan in the top, see Illustration 2.5.
The drive can be integrated in any kind of mechanical
structure of air conditioning equipment Illustration 2.6 and
Illustration 2.7.
22
Illustration 2.7 Horizontal Installation in Mechanical Structure
CAUTION
During mechanical installation of the drive make sure that
no screws can touch electrical parts on the PCB. Screws
touching the electrical parts on the PCB can cause
personal injury and product damage.
Illustration 2.6 Vertical Installation in Mechanical Structure
MG10V402 - VLT® is a registered Danfoss trademark11
The drive must be installed in a way that allows for free
22
airflow. However short circuiting the airflow (warm air reentering the drive’s cooling fan) must be avoided (see
Illustration 2.8). A clearance of 5 inches (12.7 cm) must be
observed in both ends of the drive chassis. Install the drive
in a location where coldest possible air can be drawn into
the drive, i.e. from the bottom part of an outdoor unit.
Counter flow (static pressure) must not restrict the
operation of the internal cooling fan of the drive.
Vibration and Mechanical Resonances
The mechanical structure (sheet metal) carrying the drive
must be designed to withstand vibration and consequently
resonances induced by the compressor or condenser fan.
See vibration specification for the drive further down this
document.
Also refer to 6.3.5.8 Frequency Cancelation explaining the
possibility to program bypass frequencies in the drive to
avoid mechanical resonances of the structure.
Illustration 2.8 Wrong Drive Airflow
2.4
Condensation and Dripping Water
The printed circuit board assembly of the drive is
conformally coated and thus sufficiently protected against
condensation during off time. Nevertheless, the drive
should not be exposed to dripping water (rain) or
condensing water slung around by the condenser fan. In
outdoor units, it is recommendable to install the drive in a
rain proof compartment.
12MG10V402 - VLT® is a registered Danfoss trademark
All cabling must comply with national and local
regulations on cable cross-sections and ambient
temperature. Copper conductors required.
3.2 Tightening Torque
Power supply plug terminals1.5 Nm/1.1 lbf ft
Ground screw3.0 Nm/2.2 lbf ft
Motor plug (compressor)1.5 Nm/1.1 lbf ft
EMC clamp for motor cable1.5 Nm/1.1 lbf ft
Proper temperature rating of the cable must be observed.
In installations with ambient temperatures above 30 °C
maximum current derating applies, therefore hightemperature cable with 90 °C conductor temperature, e.g.
Nexans Rheyflex is recommended. Copper type cable only.
Maximum cable length 2 m.
Cable specification for installations in North America:
3-wire cable, minimum cross section AWG 10, voltage
rating 600 V, temperature rating 221 °F/105 °C, 2/64
moisture resistant UL style 1230 standard bare copper
type. In North America, standards for radiated emission are
currently not enforced. Furthermore, FCC parts 15
regulations explicitly exempt air-condition devices.
Maximum cable length 7 ft. Local compressor grounding.
3
3
Table 3.1 Tightening Torque
3.3 Cable Quality and Dimensioning
Power supply cable
There is no need for using shielded cable for the supply of
the variable speed drive.
Motor cable
The cable from the drive to the compressor (motor) must
be shielded to comply with EMC regulations for conducted
and radiated emissions in accordance with EN 55011 class
A and EN 55014 (with ferrite). A proper ground connection
of the shield in both ends is essential to obtain the best
suppression of emissions. See also 3.6 ElectricalConnections.
Power Supply Cable Specification
Power connections must be made in accordance with local
and national codes. 2-wire cable plus ground conductor,
minimum AWG 10, voltage rating minimum 300 V,
minimum temp. rating 105 °C/221°F
Min. circuit ampacity
4 t unit35 A
5 t unit40 A
Table 3.2 Power-supply Cable Specificatoin
Motor Cable Specification
Depending on the desired level of EMC compliance
according to European or North American standards for
radiated emissions such as EN 55014/55011 or FCC part 15,
a suitable cable connection drive and compressor must be
selected. It is recommended to use shielded cable under
all circumstances.
Cable specification for installations in the EU:
4-wire cable with protective earth (PE) and shield (min 80%
coverage), minimum cross section 4 mm2 for 13 kW units
and 6 mm2 for 16 and 20 kW units, voltage rating 600 V.
3 t unit30 A
Min. circuit ampacity13 kW/3 t unit30 A
16 kW/4 t unit35 A
20 kW/5 t unit40 A
Table 3.3 Motor Cable Specification
Sensor and Transmitter Cables
Refer to the documentation provided with the Danfoss
sensors and transmitters.
For serial communication connections, see 4 SerialCommunication (Modbus RTU).
3.4
Fuses/Circuit Breakers
Branch circuit protection
To protect the installation against electrical and fire hazard,
all branch circuits in an installation must be short-circuited
and over-current protected according to national and local
regulations.
Short circuit protection
Danfoss requires using the fuses mentioned in Table 3.4 to
protect service personnel or other equipment in case of an
internal failure in the unit or short-circuit on DC-link of the
drive. The variable speed drive provides full short circuit
protection in case of a short-circuit on the motor output in
accordance with UL regulations.
Over-current protection
Overload protection must be provided to avoid
overheating of the cables in the installation. Over-current
protection must always be carried out according to
national regulations (NEC Article 430 “Motors, Motor
Circuits and Controllers” and NEC Article 440 “Airconditioning and refrigeration equipment”).
MG10V402 - VLT® is a registered Danfoss trademark13
Electrical Installation
Fuses
13 kW/3 t unit 176L0767 RLA 22Amax. fuse amperage 30 A
16 kW/4 t unit 176L0766 RLA 28Amax. fuse amperage 35 A
20 kW/5 t unit 176L0765 RLA 33Amax. fuse amperage 40 A
Fuses of type class RK5 must be used in US installations.
Recommended circuit breakers
HVCR type fusible circuit breaker may be used, see rating
above.
3.5 EMC Correct Installation
Follow these guidelines when compliance with EN 55011
cl. A or EN 55014 is required.
Good engineering practice to ensure EMC-correct electrical
installation:
Use only shielded/braided screened/armored
•
motor cables and control cables. The shield
should provide a minimum coverage of 80%. The
shield material must be metal, not limited to but
typically copper, aluminum, steel or lead. There
are no special requirements for the mains cable.
Connect the shield to ground at both ends for
•
motor cables and control cables.
Avoid terminating the shield with twisted ends
•
(pigtails). Such a termination increases the high
frequency impedance of the screen, which
reduces its effectiveness at high frequencies. Use
low impedance cable clamps (delivered with the
drive) and EMC glands instead.
Ensure good electrical contact between the de-
•
coupling plate and the metal chassis of the
variable speed drive.
Where possible, avoid using unshielded/
•
unarmored motor or control cables inside
cabinets housing the drive.
14MG10V402 - VLT® is a registered Danfoss trademark
Do not route supply, sensor and communication cables in
parallel with the motor cable. Separate cables from each
other as much as possible (see Illustration 3.2).
Furthermore, the motor cable should be kept as short as
possible.
Do not route cables across the PCB (see Illustration 3.1).
3
3
Illustration 3.1 Wrong Routing of Motor and Supply Cables
Illustration 3.2 Cable Separation
MG10V402 - VLT® is a registered Danfoss trademark15
Mains cables must be dimensioned according to national
and local standards.
Illustration 3.3 Power Supply Connections
Motor (Compressor) Connection
3.6.3
Danfoss offers different compressor models according to
the desired level of EMC compliance for radiated
emissions. Compressors for installations in the EU have a
rectangular terminal box with provision for using EMC
gland sets for shielded cable, while the models for installations in North America have a round shaped terminal
box (see Illustration 3.4 and Illustration 3.5).
The order of phases is inevitable in both cases. Always
connect T1 on the drive with T1 on the compressor and T2
and T3 accordingly, see Illustration 3.7.
Observe maximum current ratings for spade type angular
cable connectors according to manufacturer’s product
data.
Illustration 3.4 Motor (Compressor) Connection, EU Models
EU models:
The terminal box provides punch outs on the right side for
25 mm glands and in the bottom for 28 mm glands.
Connect wires for T1, T2, T3 and ground (PE) inside the
terminal box and install EMC cable gland set accordingly.
NAM models:
Connect wires for T1, T2, T3 and local grounding.
Illustration 3.5 Motor (Compressor) Connection, NAM Models
16MG10V402 - VLT® is a registered Danfoss trademark
Use of Ferrite on drive output terminals:
To comply with the most stringent standard for radiated
emissions (EN 55011 cl. B) a ferrite must be installed at the
output terminals of the drive as shown in Illustration 3.8.
The motor phase wires (T1, T2, T3) must be wound twice
around the ferrite, while the PE wire is directly connected
to the chassis, see Illustration 3.8.
Illustration 3.8 Wire Routing on Ferrite
MG10V402 - VLT® is a registered Danfoss trademark17
Connect the sensors as marked on the PCB, see
Illustration 3.9:
Aux. temperature sensor (S aux.) (if applicable)
Compressor discharge temperature (Sd)
Ambient temperature (S amb.)
Compressor suction pressure (P0)
Compressor discharge pressure (Pc)
Condenser Fan Motor Control
3.6.6
Connection (EXT_FAN)
Two different control signals are available, 0-10 V (max.
current 20 mA) analogue output and 24 V PWM duty cycle
with scalable frequency, see Modbus register description in
5 Commissioning. Connect the control signal of the
condenser fan (or any other external device like a
circulator pump) as shown and marked on the PCB, see
Illustration 3.11.
Illustration 3.9 Sensor Connections
4-way Reversing Valve Connection
3.6.5
The relay for the 4-way reversing valve is connected as
shown and marked on the PCB, see Illustration 3.10.
Max. load:
250 V AC, 4 A
24 V DC, 4 A
See 3.6.10 Allocation of Connector Pins.
Connect the RS-485 cable(s) to the PCB of the Variable Speed Drive as follows, see Illustration 3.13:
1.Attach the positive (+) polarity wire to the screw terminal.
2.Attach the negative (-) polarity wire to the screw terminal.
3.Attach the drain cable to the drain terminal (D).
4.Attach the cable with the shield to the compression clamp on the chassis.
5.Connect the other end of the RS-485 cable to the OEM Controller ensuring that the polarity of the wires matches
the polarity at the drive.
The two 3-pole connectors are marked on the circuit board as “Master” which connects to the OEM Controller, and “EEV_1”
which connects to the indoor EEV Controller (separate internal Danfoss bus).
The compression clamp is suitable to two sets of cable. Make sure to establish a good connection between the shield and
the compression clamp and the chassis.
3
3
Illustration 3.13 Serial Communication Connection Cable
When selecting a transmission line for RS-485, it is necessary to examine the required distance of the cable and the data
rate of the system. Losses in a transmission line are a combination of AC losses (skin effect), DC conductor loss, leakage, and
AC losses in the dielectric. In high-quality cable, the conductor losses and the dielectric losses are on the same order of
magnitude.
The recommended maximum Modbus cable length between the drive and the OEM Controller should not exceed 100 ft (30
m).
While the RS-485 specification does not specify cabling, the recommendation is 24 AWG shielded twisted-pair cable with a
shunt capacitance of 16 pF/ft and 100 Ω impedance.It is also possible to use the same cable commonly in the twisted-pair
Ethernet cabling. This cable is commonly referred to as Category 5 cable. The cable has a maximum capacitance of 17 pF/ft
(14.5 pF/ft typical) and characteristic impedance of 100 Ω.
MG10V402 - VLT® is a registered Danfoss trademark19
The following 3 wiring diagrams show typical system configurations for an AC system (see Illustration 3.20), a combined
AC/HP system (see Illustration 3.21) and a ground source heat pump system (see Illustration 3.22), with all Danfoss
components.
Illustration 3.20 AC only System
22MG10V402 - VLT® is a registered Danfoss trademark
General
The serial communication bus is used to receive Modbus Slave Messages from an external source. In normal operation, this
will be a Modbus Master usually called the “OEM Controller”. When not in service, the OEM or manufacturing can access the
device for configuration or service, see Illustration 4.1 and Illustration 4.2.
NOTE
The Modbus communication is available after the drive has performed an internal test routine, approximately 15 seconds
after power up.
The Modbus implementation has been designed to conform to the Modbus Standard Protocol.
For details, refer to
Modbus Application Protocol Specification, V1.1b
•
Modbus Over Serial Line Specification and Implementation Guide, V1.02
•
Modicon Modbus Protocol Reference Guide
•
PI–MBUS–300 Rev. J
44
Also visit www.modbus.org
For details about setting up the Modbus serial communication, refer to the Modbus RTU Communication Setup Manual.
Illustration 4.1 Modbus Communication Set-up, for AC only, and Combined AC/HP Systems
MG10V402 - VLT® is a registered Danfoss trademark25
5.1 Initial Configuration of the Performer
VSD sub-system
System components offered by the OEM, such as outdoor
units, indoor units/air handlers, evaporator modules or
furnaces are often manufactured in different locations and
first merged into a complete system at the end user’s site.
Furthermore, numerous combinations of such components
are feasible. Therefore it is extremely important to prepare
the components during manufacturing for a late merge in
the field.
Alternatively, the configuration of each individual
component can be made in the field. This can be done
with Danfoss Update tool or Modbus tool allowing
programming the drive, application controller and EEV
Controller via the serial communication interface (Modbus
RTU).
This functionality can also be incorporated in the OEM
Controller by establishing a protected service menu,
allowing accessing all Modbus registers.
Individual solutions can be worked out in cooperation with
the product support team.
5.2
Drive Setup
The variable speed drive including the embedded
application controller and the EEV Controller(s) can be
individually configured by setting various parameters
(Modbus registers). This manual is limited to the drive
parameters. For the application controller and the EEV
Controller(s), refer to the separately provided documentation.
NOTE
Changing the setting of some registers requires re-booting
before the setting becomes effective. For details, refer to
the Modbus RTU Communication Setup Manual.
The timeouts and response times of Modbus messages to
and from the drive is in accordance with the Modbus
standard.
5.2.1
Drive Parameters
(Modbus Registers, node 162)
Register 40001-40010, PCA Bar Code (read only)
These registers (10) allow reading the bar code information
on the PCA, which is also found on the product identification label on the drive chassis.
Register 40011-40020, Ordering code (read only)
These registers (10) allow reading the Danfoss ordering
code, which is also found on the product identification
label on the drive chassis, typically starting with 176L…..
Register 40021 and 40022, Operation Time Counter (read
only)
These registers allow reading the accumulated time the
drive has been powered. The value is given in seconds.
Register 40101-40110, AOC Software Version (read only)
These registers (10) allow reading the software version
number for the application oriented microprocessor.
Register 40111-40120, AOC Registers Version (read only)
These registers (10) allow reading the registers version
number for the application oriented microprocessor.
Register 40121 and 40122, Drive Status
These registers describe the exact operation condition of
the system in a 32 bit structure. See separate description
in 7 Fault Conditions, Messages and Causes.
Register 40131, OEM Reset
Setting this register to logic “1” resets the drive to the
OEM defaults (configuration defaults set by the OEM in
production) stored in the EEPROM.
Register 40132, Danfoss Reset
Setting this register to logic “1” resets the drive to the
Danfoss defaults (factory defaults as listed in this manual
and Modbus register map files)
Register 40133, Overwrite Defaults
Setting this register to logic “1” allows overwriting the
factory defaults. This should only be done with assistance
from Danfoss.
NOTE
Do not set registers 40132 and 40133 to logic “1” at the
same time.
55
In the following chapters, the drive parameters are
described by the register number.
MG10V402 - VLT® is a registered Danfoss trademark27
Register 40134, Test Register
This register has been created as a test tool to verify
proper Modbus communication. To test the communication, write any value between 0 and 65535 to the
register and verify that the same value is successfully
reported back from the slave node (drive).
Register 40135, Drive Reboot
Setting this register to logic “1” initiates a reboot
sequence; this equals cycling power to the drive.
Register 40141, OEM baud rate (default 19200)
This register allows setting the baud rate for the Modbus
55
serial communication.
Value
09600 kbps
119200 kbps
Register 40146, EEV Indoor Unit Address (def. 165, min 1,
max 247)
This register allows setting the bus address (node address)
of the EEV Controller in the indoor unit. The default
address is 165 and can be set to a value between 1 and
247.
NOTE
Must be set to the same value on EEV Controllers.
Register 40147, EEV Outdoor Unit Address (def. 164, min 1,
max 247)
This register allows setting the bus address (node address)
of the EEV Controller in the outdoor unit (if applicable, in
systems with 2 EEV’s only). The default address is 164 and
can be set to a value between 1 and 247.
NOTE
Table 5.1 OEM Baud Rate
Register 40142, OEM Parity
This register allows setting the Parity of the Modbus
protocol.
Value
0None
1Odd
2Even (default)
Table 5.2 OEM Parity
Register 40143, OEM Stop Bits
This register allows setting the number of stop bits of the
Modbus protocol.
Value
11 stop bit (default)
22 stop bits
Must be set to the same value on EEV controllers.
Register 40148, OEM Communication Timeout (def. 20 sec,
min 0 sec, max. 3600 sec)
The time set in this register determines the duration from
loosing communication with the OEM controller to
stopping the system. When communication is reestablished, the drive will resume operation automatically.
Setting this register to 0 sec. means that the drive will not
stop in case of loosing communication.
Registers 40499 and 40500, Sensor S_AUX
These registers allow reading the temperature reading of
the auxiliary sensor input S_AUX in degrees centigrade
(°C); in case a PT 1000 sensor is connected.
Register 40501-40550, OEM Data registers
Danfoss has established 50 OEM registers that the OEM
customer can use freely to store product information. All
registers are of type unsigned 16.
Drive Parameters
Table 5.3 OEM Stop Bits
5.2.2
(Modbus Registers, node 163)
Register 40144, Drive AOC Address (def. 162, min 1, max
247)
This register allows setting the bus address (node address)
of the application oriented microprocessor of the drive.
The default address is 162 and can be set to a value
between 1 and 247.
Register 40145, Drive MOC Address (def. 163, min 1, max
247)
This register allows setting the bus address (node address)
of the motor oriented microprocessor of the drive. The
default address is 163 and can be set to a value between 1
and 247.
NOTE
The same address must be set in MOC register 40145.
28MG10V402 - VLT® is a registered Danfoss trademark
Register 40101-40110, MOC Software Version (read only)
These registers (10) allow reading the software version
number for the motor control oriented microprocessor.
Register 40111 and 40120, MOC Registers Version (read
only)
These registers (10) allow reading the register version
number for the motor control oriented microprocessor.
Register 40131, OEM Reset
Setting this register to logic “1” resets the drive to the
OEM defaults (configuration defaults set by the OEM in
production) stored in the EEPROM.
Register 40132, Danfoss Reset
Setting this register to logic “1” resets the drive to the
Danfoss defaults (factory defaults as listed in this manual
and Modbus register map files)
Register 40133, Overwrite Defaults
Setting this register to logic “1” allows overwriting the
factory defaults. This should only be done with assistance
from Danfoss.
Register 40134, Test Register
This register has been created as a test tool to verify
proper Modbus communication. To test the communication, write any value between 0 and 65535 to the
register and verify that the same value is successfully
reported back from the slave node (drive).
Register 40145, Drive MOC Address (def. 163, min 1, max
247)
This register allows setting the bus address (node address)
of the motor control oriented microprocessor of the drive.
The default address is 163 and can be set to a value
between 1 and 247.
Register 40201 and 40202, Compressor Power
Consumption in kWh (read only)
These registers allow reading the power consumption of
the compressor.
Register 40203 and 40204, Compressor Power in kW (read
only)
These registers allow reading the input power to the
compressor.
Register 40205 and 40206, Supply Voltage (read only)
These registers allow reading the supply voltage (line
voltage) applied to the drive.
Register 40207 and 40208, Inverter Temperature (read
only)
These registers allow reading the internal inverter
temperature measured in the power module of the drive
in °C.
Register 40209 and 40210, UDC Voltage (read only)
These registers allow reading the DC voltage in the
intermediate circuit of the drive.
Register 40211 and 40212, Internal Fan Speed (read only)
These registers allow reading the speed of the integrated
cooling fan in the drive in a percentage.
5.3
Condenser Fan Speed Reference Output
When the condenser fan speed control mode is selected in
the application controller the drive calculates the optimum
fan speed for efficiency optimization and provides a speed
reference output signal for the variable speed condenser
fan motor. When the speed control is deselected the
output can be used to control any other external device
such as a circulator pump in a ground source heat pump,
simply by using the Modbus external speed register and
the control signal describe hereinafter.
The following signals are simultaneously available:
Analog output 0-10 V
•
Frequency duty cycle output 24 V PWM, 0-10 kHz
•
Reg. 41609 and 41610, Outdoor fan capacity PCT min
Reg. 41611 and 41612, Outdoor fan capacity PCT max
Reg. 41613 and 41614, Outdoor fan control signal freq
5.4 Crankcase Heating
The variable speed drive comprises an electronic crankcase
heating, by injecting a DC voltage to the compressor
motor. The resulting current heats the motor windings and
therewith effectively prevents refrigerant from accumulating in the compressor sump. An additional heating belt
is not required.
Register 40479 and 40480 Crankcase heating on
temperature (min 50 °F/10 °C, max +77 °F/+25 °C)
This register allows setting the temperature at which the
crankcase heating is activated. Setting register 40481 to
value "0" deactivates the crankcase heating function
permanently (default is "1"/ON).
The temperature equals the ambient temperature
measured by the drive in the outdoor unit.
NOTE
The crankcase heating is not active when power is disconnected to the drive as well as when the compressor is in
operation. Crank case heating will also not be active when
drive is stopped because of an alarm.
The power consumption of the crankcase heating is
approximately 40 W.
5.5
Ambient Temperature Source
The ambient temperature value can be provided from a
sensor connected directly to the drive, or it can be sent to
the unit via Modbus from the OEM controller.
Register 40216, Thermo in Ambient Temperature
An internal analog value from the ambient temperature
sensor connected to the drive at the S_Amb input. (-999
°C if not connected).
Register 40225, Thermo In External Ambient Temperature
The OEM controller writes the ambient temperature via
Modbus. When using the Modbus ambient temperature
signal, the OEM controller it must update the signal at
least every 60 s. Otherwise the drive goes into safe mode.
Register 40484, Thermo Setup Ambient Temperature
Source
Selects the source of ambient temperature used by
software control algorithms (Crankcase Heating and
Outdoor Fan Control).
55
MG10V402 - VLT® is a registered Danfoss trademark29
0 = 40216 Thermo In Ambient Temperature
1 = 40225 Thermo In External Ambient
Temperature
Default value of the register is 0, and therefore a
temperature sensor must be connected to the drive as
default unless this register is set to 1. It is important that
the ambient temperature value is a true measurement of
the ambient temperature outside the enclosure containing
the compressor and the drive. This value is used for
(crankcase heating and fan control).
55
5.6 Pressure sensor scaling
When using other pressure sensors than Danfoss AKS
sensors (specified in the sensor selection guide), the
pressure configuration registers must be changed to match
the range of the used sensors.
Register 41601 and 41602, Suction pressure min
Register 41603 and 41604, Suction pressure max
Register 41605 and 41606, Condenser pressure
min
Register 41607 and 41608, Condenser pressure
max
All pressure calculations in the drive is done in an absolute
pressure scale (atmospheric pressure = 1bar).
Example: Absolute pressure range 0-20 bar ⇒ pressure min
= 0 and pressure max = 20.
Optional Commands:
Optional available information:
The drive and the EEV Controller(s) allow reading a large
number of data to be polled by the Modbus Master (OEM
Controller), such as:
Setpoint and room temperature (in closed loop
•
operation)
Capacity request (in open loop operation)
•
Dehumidification Mode
•
Product identification
•
Operation status (alarms and warnings)
•
Operation data
•
Power consumption
•
Compressor speed
•
Pressure and temperature values
•
Etc.
•
If a pressure sensor with a gage pressure range is used
(atmospheric pressure = 0 bar), the min and max pressure
must be added with 1 to compensate for the offset in the
range when configuring the sensor.
Example: gage pressure scale 0-20 bar ⇒ pressure min = 1
and pressure max = 21.
5.7
Normal Operation
NOTE
After connecting power to the drive, wait at least 15
seconds until the initialization is completed before
accessing the Modbus communication.
Mandatory commands:
To operate the system a minimum number of commands
must be provided by the OEM
Controller:
Start
•
Stop
•
Reboot
•
30MG10V402 - VLT® is a registered Danfoss trademark
The Residential Variable Speed Drive system is consisting of compressor, variable speed drive, application controller,
Electronic Expansion Valves (EEV), EEV controller and sensors.
Variable Speed Drive and EEV controller are set to be able to communicate using Modbus RTU protocol. Communication
details are available in the Modbus Communication Set-up Manual. Establishing the communication and configuring the
system requires individual parameters settings. These settings must be done through the OEM controller or any other PC
tool, using the Modbus communication.
This chapter describes the operation modes of the application controller. Included is also the parameter lists and parameter
descriptions.
6.2 Applications
6.2.1 Generic AC
6
6
Illustration 6.1 Generic AC
MG10V402 - VLT® is a registered Danfoss trademark31
The Thermo Controller is an integrated part of the VLT
Inverter Scroll CDS 801 system. The purpose of the
application controller is to control the speed of the
compressor to a given load of the system. It also controls
the speed of the condenser fan (outdoor unit), both in A/C
mode, Defrost and HP mode. It is possible to select various
control modes for the compressor and the condenser fan.
It communicates with the EEV controllers, the OEM
controller and sets the relay for the 4-way valve. The
Thermo Controller has several built-in safety functions to
protect the compressor.
The following paragraphs describe the application
controller functionality and safety functions.
System Modes
6.3.2
System modes are:
Off
•
AC (cooling)
•
HP (heating)
•
Defrost
•
MG10V402 - VLT® is a registered Danfoss trademark33
The system mode is selected by setting a value in the
THERMO_IN_MODE register.
6.3.2.1 Off
To set the system off:
set THERMO_IN_MODE = 0
The compressor and condenser fan shut down and the
indoor and outdoor EEVs close the valves.
The application controller continuously polls the EEVs for
their status register. If the status register polling fails, the
EEVs go into autonomous mode and attempt to control
superheat.
In autonomous mode, the EEV attempts to control the
superheat without Modbus communication. If an additional
suction pressure sensor is not connected to the EIM316,
the EIM316 will not have a suction pressure signal, and will
go in to error mode (Valve opening = 80 % of average
value).
6.3.2.2
In cooling mode, the Indoor EEV is active and receives the
suction pressure signal over the Modbus from the Thermo
Control controller. The outdoor EEV is inactive.
In AC mode, the system sets the 4-way valve to operate
the indoor unit as evaporator and the outdoor unit as
condenser.
The indoor EEV controller actively controls the superheat
on the indoor evaporator.
The outdoor EEV valve will be closed.
The Thermo Control controller continuously polls the EEVs
for their status register. If the status register polling fails,
the EEVs go into autonomous mode and attempt to
control superheat.
To set the system in AC mode:
set THERMO_IN_MODE = 1
When conditions for start up are met:
The restart timer has elapsed
•
The requested compressor speed is higher than
•
the minimum allowed speed
The system go into a start-up sequence. The start-up
sequence is described in 6.3.5.1 Start-Up Sequence.
6.3.2.3
HP
To set the system in Defrost mode:
set THERMO_IN_MODE = 3
There is no specific control algorithms for defrosting,
compressor speed and fan speed must be handled by the
OEM controller. However, the limitations from the
compressor protection is different from AC mode. This
allows the OEM controller to execute a defrosting
sequence with good performance.
6.3.3 Compressor Capacity Control
The compressor speed control can be done through
different strategies. The compressor control strategy is
selected by setting the THERMO_IN_COMPRESSOR_MODE.
In Heat Pump mode, the outdoor EEV is active, and
receives the suction pressure signal over the Modbus from
the Thermo Control controller. The indoor EEV is inactive.
In HP mode, the system sets the 4-way valve to operate
the indoor unit as condenser and the outdoor unit as
evaporator.
The outdoor EEV controller actively controls the superheat
on the outdoor evaporator.
The indoor EEV valve will be closed.
The Thermo Control controller continuously polls the EEVs
for their status register. If the status register polling fails,
the EEVs go into autonomous mode and attempt to
control superheat.
To set the system in HP mode:
set THERMO_IN_MODE = 2
When conditions for start up are met:
The restart timer has elapsed
•
The requested compressor speed is higher than
•
the minimum allowed speed,
The system go into a start-up sequence. The start-up
sequence is described in 6.3.5.1 Start-Up Sequence.
6.3.2.4
The purpose of Defrost mode is to allow the OEM
controller to perform an efficient defrost routine. In Defrost
mode, the EEVs and 4-way valve work identically to AC
mode.
34MG10V402 - VLT® is a registered Danfoss trademark
In single temperature control, the Inverter Scroll CDS 801 system attempts to maintain a temperature, typically a room
temperature, see Illustration 6.4.
The reference and the room temperature are sent from the OEM controller.
The Thermo Control controller calculates the necessary compressor speed and condenser fan speed.
To set the compressor control to single temperature closed loop control:
Set THERMO_IN_COMPRESSOR_MODE = 0
The Thermo Control controller reads the reference from
THERMO_IN_ROOM_TEMPERATURE_SET_POINT
and the actual room temperature from
THERMO_IN_ROOM_TEMPERATURE.
Illustration 6.4 Single Loop Room Temperature Control
6
6
6.3.3.2 Open Loop/ External Speed Control
In external speed control (see Illustration 6.5), the compressor speed is set externally from the OEM controller through the
Modbus.
When in external speed mode, the compressor derating and safety envelope functions are still active and takes precedence
over the external speed signal.
To set the compressor speed control into external speed control:
Set THERMO_IN_COMPRESSOR_MODE = 2
The external speed % is set in the THERMO_IN_COMPRESSOR_EXTERNAL_SPEED_PCT register.
Illustration 6.5 Open Loop/External Speed Control
0% Speed request = 0 Hz, and start will not be allowed until 60 s later. (control restart timer).
1% Speed request = 15 Hz
100% Speed request = 70 Hz, see Illustration 6.6
Can be overruled by derating functions (explained in 6.3.5.5 Derating).
MG10V402 - VLT® is a registered Danfoss trademark35
10100
15
70
Compressor speed
[Hz
]
Speed request
[%]
130ZB124.10
6
Embedded Application Contro...
Illustration 6.6 Compressor Speed vs. Speed Request
The outdoor fan speed control can be done through different strategies. The fan control strategy is chosen by setting the
THERMO_IN_FAN_MODE register. The fan speed control strategy depends also on the system mode: AC vs. HP. If the system
is in AC mode, the outdoor fan controls the condensing pressure/temperature. This temperature has to be higher than the
ambient temperature, so that the condenser can reject heat. If the system is in HP mode, the outdoor fan controls the
evaporator pressure/temperature. This temperature has to be lower than the ambient temperature, so that the evaporator
can absorb heat. Fan speed control is illustrated in Table 6.1.
ModeTHERMO_IN_FAN_MODESystem mode = AC (and defrost)System mode = HP
Delta T Control
In Delta T mode, the fan speed control attempts to maintain a temperature difference of Delta T to ambient temperature,
see Illustration 6.8.
In AC mode, the fan speed control attempts to maintain condensing temperature Delta T above ambient temperature.
To run Delta T mode:
Set THERMO_IN_FAN_MODE = 1
The temperature difference Delta T is set through the register THERMO_SETUP_DELTA_TEMP.
6
6
Illustration 6.8 Delta T Control
Open Loop/External Speed Control
In external speed control, the fan speed is set externally
from the OEM controller through the Modbus. The speed
can be overruled by the fan protection functions like min
and max condensing pressure derating, see Illustration 6.9.
To set the fan speed control in to external speed control:
Set THERMO_IN_FAN_MODE = 2
protection functions, and will never be overruled by
functions like min and max condensing pressure derating,
see Illustration 6.10. To set the fan speed control in to
bypass:
Set THERMO_IN_FAN_MODE = 3
The external speed % is set in the
THERMO_IN_FAN_EXTERNAL_SPEED_PCT register.
The external speed % is set in the
THERMO_IN_FAN_EXTERNAL_SPEED_PCT register.
Illustration 6.10 Bypass Fan Speed Control
Illustration 6.9 Open Loop/External Speed Control
Bypass fan speed control
In Bypass speed control, the fan speed is set externally
from the OEM controller through the Modbus. In the
bypass mode the external speed is bypassing the fan
MG10V402 - VLT® is a registered Danfoss trademark37
In HP mode the fan controls evaporator pressure since the outdoor unit works as an evaporator.
Optimal Pressure Ratio Control
In Optimal COP mode, the fan speed control attempts to maintain a constant pressure ratio
Pc/P0 = constant
across the compressor, see Illustration 6.11. This ratio is the theoretically optimal pressure ratio for the compressor.
To run optimal COP mode:
Set THERMO_IN_FAN_MODE = 0
Illustration 6.11 HP Mode
Delta T Control
In Delta T mode, the fan speed control attempts to maintain a temperature difference of Delta T to ambient temperature,
see Illustration 6.12.
In HP mode, the fan speed control attempts to maintain evaporator temperature Delta T below ambient temperature.
To run Delta T mode:
Set THERMO_IN_FAN_MODE = 1
The temperature difference Delta T is set through the register THERMO_SETUP_DELTA_TEMP.
Illustration 6.12 Delta T Control
38MG10V402 - VLT® is a registered Danfoss trademark
To transfer heat to the evaporator, a temperature
difference is needed (evaporator temperature must be
lower than the ambient temperature). Under cold ambient
conditions this brings the suction pressure close(r) to the
edge of the operating envelope. It is therefore important
to make the temperature difference between evaporator
and ambient as small as possible under cold conditions.
The Delta T, (or the T0
) is therefore made dependent on
ref
the ambient temperature, see Illustration 6.13.
Illustration 6.13 shows how the set point for the Delta T
control mode in HP system mode is a function of ambient
temperature and T0
approaches the T0
. As the ambient temperature
min
line (see Illustration 6.14), the Delta T
min
is lowered. This is done to prevent too low evaporator
temperatures when the ambient temperature is low.
To set the fan speed control to external speed control:
Set THERMO_IN_FAN_MODE = 2
The external speed % is set in the
THERMO_IN_FAN_EXTERNAL_SPEED_PCT register.
Illustration 6.15 Open Loop/External Speed Control
Bypass fan speed control
In Bypass speed control, the fan speed is set externally
from the OEM controller through the Modbus. In bypass
mode, the external speed is bypassing the fan protection
functions, and will never be overruled by functions like
min and max condensing pressure derating, see
Illustration 6.16. To set the fan speed control in to Bypass:
Set THERMO_IN_FAN_MODE = 3
The external speed % is set in the
THERMO_IN_FAN_EXTERNAL_SPEED_PCT register.
6
6
Illustration 6.13 T0
Illustration 6.14 Definition of T0
leftmost line(s) of the envelope
Open Loop/ External Speed Control
In external speed control, the fan speed is set externally
from the OEM controller through the Modbus. The speed
can be overruled by the fan protection functions like min
and max condensing pressure derating, see Illustration 6.15.
= f(Tambient) in HP mode (Delta T)
ref
min
Illustration 6.16 Bypass Fan Speed Control
6.3.4.3 Defrost Mode
In Defrost mode the fan controls condensing pressure,
since the outdoor unit works as a condenser. The same fan
control options like in AC are available, when defrosting
the outdoor coil.
Auxiliary Functions
6.3.5
6.3.5.1 Start-Up Sequence
When the system starts up from idle in AC or HP mode,
the compressor follows a start up sequence, see
Illustration 6.17. This sequence is defined by a ramp (2.7
Hz/s), start speed (THERMO_SETUP_START_UP_SPEED_HZ)
line. The T0
line is the
min
and hold time for start speed
(THERMO_SETUP_START_UP_HOLD_TIME_SEC).
MG10V402 - VLT® is a registered Danfoss trademark39
When switching to and from Defrost mode, the start speed
hold time is disabled. The compressor then ramps up
continuously to the compressor speed setpoint and skips
the start speed hold time. This allows for a more efficient
defrosting.
6.3.5.2
Restart Timer
To increase compressor lifetime, there is a minimum time
between compressor starts. This restart time (at least 1
minute) is defined by
Restart time register: THERMO_SETUP_RESTART_TIME_SEC
When switching to and from Defrost mode, the restart
timer is disabled. This results in a quick switch in system
mode and allows for a more efficient defrosting of the
outdoor coil.
If the system mode is changed, or compressor is stopped
and started too frequently, the drive will stop and raise an
alarm. Only 6 compressor restarts within 600 s are allowed,
there after the system will stop and raise an alarm.
6.3.5.3
Given the allowed ranges of suction pressure and
condensing pressure, the compressor safety envelope
defines the speed range (min and max RPM) that the
compressor is allowed to run at, however limited by the
over all compressor speed range 900-4200 RPM, see
Illustration 6.18.
40MG10V402 - VLT® is a registered Danfoss trademark
Compressor Safety Envelope
The compressor safety envelope takes precedence over
any requested compressor capacity and external speed
request. Crossing from one envelope to another will not
stop the drive if it is running at a low compressor speed.
Instead, the compressor speeds up to the minimum speed
of the newly entered envelope.
When operating in Defrost mode, the envelope limits are
extended to allow for a lower saturated condensing
temperature (> 20 °F), which can be necessary when
defrosting the outdoor coil. Because the envelope has an
extension for defrosting, there is also a maximum duration
of defrost allowed. The system can only operate for 1800 s
in Defrost mode. If the OEM controller does not terminate
the defrosting before the timer has elapsed, the system
stops and raises an alarm.
6.3.5.4
Oil Return
The scroll compressor needs oil to be protected against
wear. When running, oil leaves the compressor together
with the refrigerant. The rate of oil loss is estimated as a
function of compressor speed.
The oil return is executed if the speed stays below the oil
return speed for a time defined by
THERMO_SETUP_OIL_LOSS_TRIG_TIME_SEC. The oil return
sequence is defined by the oil return speed
THERMO_SETUP_OIL_RETURN_SPEED_HZ and the oil return
hold time THERMO_SETUP_OIL_RETURN_HOLD_TIME_SEC.
6.3.5.5
Derating
The purpose of the derating functions is to keep the
compressor and drive within the specified operating
conditions, while still providing cooling/heating.
Derating is not an error condition. It only means that the
requested speed cannot be accomodated at the moment,
to keep the compressor and drive within specified
operating limits.
Drive Power Derating
The compressor speed is limited to keep the drive power
below its maximum power limit. This limit is a function of
the line voltage input to drive.
In AC mode, the fan speed will be increased to keep the
drive power below its maximum limit. This is done to
lower condensing pressure and thereby power
consumption.
Drive Temperature Derating
The compressor speed is limited to keep the drive
temperature below its maximum limit.
Max Condensing Pressure Derating
The compressor speed is limited to keep the condensing
pressure below its maximum limit. The maximum
condensing pressure is a function of suction pressure, and
part of the envelope protection.
In AC mode, the fan speed is increased to keep the
condensing pressure below its maximum limit.
Min Condensing Pressure Derating
In AC mode, the fan has control over the condensing
pressure. When the condensing pressure is lower than
minimum, the fan speed decreases.
Min Suction Pressure Derating
If the suction pressure is lower than the minimum suction
pressure, then the compressor speed decreases.
In HP mode, the fan speed also increases if the suction
pressure is lower than the minimum.
6.3.5.8
Variable speed systems sometimes are characterized by
showing mechanical resonances at critical compressor
speeds. Therefore Danfoss has established parameters to
set 5 bypass speeds with individual bandwidths. If a
mechanical resonance occurs, i.e. at 1600 RPM compressor
speed, this speed can be set to one of the bypass
frequencies. To define the bandwidth, a bypass range can
be set, i.e. 200 RPM. In this example the compressor would
not be operated between 1500 and 1700 RPM. If the
system demand requires a speed of more than 1500 RPM,
the drive remains at 1500 RPM, until the system demand
exceeds 1600 RPM; then the speed is increased to 1700
RPM and vice versa.
Critical bypass speed can be set individually in the field
using a Modbus service tool; however, it is recommended
to search for resonances in the design phase of variable
speed air-conditioning or heat pump systems.
The bypass speed can be set within the entire operation
range of the drive from 900-4200 RPM. The controller can
skip five speed ranges. Each range is specified as a centre
frequency and a bandwidth.
6.3.5.9
The system status is expressed in the content of several
Modbus registers. Also refer to 7 Fault Conditions, Messagesand Causes.
Frequency Cancelation
System Status
6
6
6.3.5.6
The discharge temperature is for 90 s allowed to be above
the max. discharge temperature, after that the drive will
stop and go into a safe mode condition. When the
temperature has dropped below the allowed max.
temperature, the drive automatically restarts when the
restart timer has elapsed.
6.3.5.7
When the suction pressure exceeds the maximum
operating pressure, the EEV controller decreases its
opening degree. If the suction pressure exceeds the
maximum operating pressure for more than 90 s, the
controller stops the compressor and restarts after the
restart time has elapsed.
Discharge temperature cut out
Max Suction Pressure (MOP)
MG10V402 - VLT® is a registered Danfoss trademark41
All registers with name type of THERMO_SETUP_XXXXXX are stored in eeprom and can only be overwritten 1 million times.
The same applies for 40201 - THERMO_IN_COMPRESSOR_MODE and 40202 - THERMO_IN_FAN_MODE, see Table 6.2.
40213THERMO_IN_FAN_EXTERNAL_SPEED_PCTCondenser outdoor fan external speed % command from OEM
40214THERMO_IN_DISCHARGE_TEMPERATURE
40216THERMO_IN_AMBIENT_TEMPERATURE
40218THERMO_IN_S4
40220THERMO_IN_DRIVE_TEMPERATURE
40222THERMO_IN_LINE_VOLTInput voltage to drive
40224THERMO_IN_OIL_RETURN_SWITCH_ON0: off, 1: on, will be reset to off when drive has been powered
40225THERMO_IN_EXTERNAL_AMBIENT_TEMPERATURE
40301THERMO_OUT_COMPRESSOR_SPEED_HZCompressor speed command to motor control/drive
40303THERMO_OUT_FAN_SPEED_PCTFan speed command to outdoor fan
40305THERMO_OUT_FOUR_WAY_VALVEFour way valve control to set the system in AC or HP mode
40306THERMO_OUT_START_EEV_INDOORCommand register to indoor EEV
40307THERMO_OUT_START_EEV_OUTDOORCommand register to outdoor EEV
Room temperature [°C] from OEM controller
Room temperature [°C] setpoint from OEM controller
0% = off
1% = Min speed. 100% = Max speed
controller
Compressor discharge temperature [°C] from sensor connected
to drive
Ambient temperature [°C] from sensor connected to drive
Temperature [°C] signal from indoor EEV (not active yet)
Drive temperature [°C]
off
[°C] Ambient temperature provided via Modbus from OEM
controller.
0% to 100%
0 = stop
1 = start
0 = stop
1 = start
42MG10V402 - VLT® is a registered Danfoss trademark
40403THERMO_SETUP_COMPRESSOR_MINIMUM_SPEED_HZMinimum compressor speed
40404THERMO_SETUP_COMPRESSOR_MAXIMUM_SPPED_HZMaximum compressor speed
40405THERMO_SETUP_DELTA_HZ_PER_SECAllowed speed rate of change in Hz pr. s
40407THERMO_SETUP_DELTA_TEMPDelta temperature setting for fan “Delta T” control mode
40409THERMO_SETUP_OIL_LOSS_TRIG_TIME_SECWhen running below oil return speed for more than this time,
oil return is initiated
40410THERMO_SETUP_OIL_RETURN_SPEED_HZDefined oil return speed
40411THERMO_SETUP_OIL_RETURN_HOLD_TIME_SECHold time for running at oil return speed
40412THERMO_SETUP_START_UP_SPEED_HZStart up speed for system
40413THERMO_SETUP_START_UP_HOLD_TIME_SECHold time for start up speed
40414THERMO_SETUP_RESTART_TIME_SECMinimum Time between repeated starts
40415THERMO_SETUP_CANCEL_CENTER_HZ_1Centre frequency #1 for speed range cancellation
40416THERMO_SETUP_CANCEL_BANDWIDTH_HZ_1Bandwidth #1 for speed range cancellation
40417THERMO_SETUP_CANCEL_CENTER_HZ_2Centre frequency #2 for speed range cancellation
40418THERMO_SETUP_CANCEL_BANDWIDTH_HZ_2Bandwidth #2for speed range cancellation
40419THERMO_SETUP_CANCEL_CENTER_HZ_3Centre frequency #3 for speed range cancellation
40420THERMO_SETUP_CANCEL_BANDWIDTH_HZ_3Bandwidth #3 for speed range cancellation
40421THERMO_SETUP_CANCEL_CENTER_HZ_4Centre frequency #4 for speed range cancellation
40422THERMO_SETUP_CANCEL_BANDWIDTH_HZ_4Bandwidth #4 for speed range cancellation
40423THERMO_SETUP_CANCEL_CENTER_HZ_5Centre frequency #5 for speed range cancellation
40424THERMO_SETUP_CANCEL_BANDWIDTH_HZ_5Bandwidth #5 for speed range cancellation
40425THERMO_SETUP_PI_COMPRESSOR_AC_KPProportional gain for AC compressor capacity controller
40427THERMO_SETUP_PI_COMPRESSOR_AC_TNIntegration time for AC compressor capacity controller
40428THERMO_SETUP_PI_COMPRESSOR_AC_TTTracking time constant for AC compressor capacity controller
40429THERMO_SETUP_PI_COMPRESSOR_HP_KPProportional gain for HP compressor capacity controller
40431THERMO_SETUP_PI_COMPRESSOR_HP_TNIntegration time for HP compressor capacity controller
40432THERMO_SETUP_PI_COMPRESSOR_HP_TTTracking time constant for HP compressor capacity controller
41609OUTDOOR_FAN_CAPACITY_PCT_MINMinimum duty cycle that will be output by the fan controller
41611OUTDOOR_FAN_CAPACITY_PCT_MAXMaximum duty cycle that will be output by the fan controller
41613OUTDOOR_FAN_CONTROL_SIGNAL_FREQUENCYSet frequency of the condenser fan PWM signal
40479THERMO_SETUP_CRANK_CASE_HEATING_ON_TEMPAmbient temperature where crankcase heating is activated
The variable speed drive is featuring Modbus registers
reflecting the exact operating conditions of the system:
Normal Operation Status (reg. 40121 and 40122),
•
the system operates without limitations.
Derating Status (reg. 40123 and 40124), the
•
system cannot operate at the quested capacity.
Safe Mode Status (reg. 40125 and 40126), the
•
system has encountered a condition that has
made operation unsafe, e.g. loss of communication with the EEV controller or a sensor signal.
In Safe Mode, the drive is running a constant
speed of 2400 RPM until the problem is resolved
77
The statuses are expressed by individual sticky bits, which
are set logic “1” as long as the particular status is present,
see the following detailed explanations.
Normal Status (reg. 40121 and 40122):
Bit 0, Compressor Running
Whenever the compressor is running, this bit will be set.
This is independent of control mode, speed or other
operation conditions.
Bit 3, Crankcase heating
The crankcase heater is active; the drive injects a DC
voltage into the compressor motor.
Bit 4, Control Start-up
The system is performing a start-up sequence, e.g. for
proper oil distribution and is not (yet) following the
required speed reference. During start-up, the compressor
runs at 2400 RPM for 60 s and then returns to the
requested speed.
Bit 5, Control Oil Return
The system has been running at less than 2400 RPM for 30
minutes and is automatically performing an oil return
sequence. The thermo controller will ignore the requested
reference and runs the compressor at 2400 RPM for 60 s to
distribute oil in the system and then returns to normal
operation.
and then automatically resumes normal
operation.
Alarm Status (Fault) (reg. 40127 and 40128), the
•
system has encountered a severe exceptional
condition and the compressor has been stopped.
The alarm bit remains logic “one” for at least 120
s and the system will afterwards attempt to
return to normal operation when the bit becomes
logic “zero”. In some cases (see individual alarms),
the drive goes into a trip lock condition. To
restart the system, it is necessary to cycle power
to the drive or perform a reboot (register 40135).
A reset alone does not clear this condition!
Bit 6, Restart time
When the compressor is stopped, but system still powered
on, the restart timer is activated. The restart timer will not
allow the compressor to restart before 60 s after it was
stopped.
Bit 28, Derating Active
The system is in a derating condition, read the Derating
Status register for more information.
Bit 29, Safe Mode Active
The system is in a Safe Mode condition, read the Safe
Mode Status register for more information.
Bit 30, Alarm Active
The system is in an Alarm condition, read the Alarm Status
register for more information.
Bit 31, Alarm Trip Lock Active
The system is in an Alarm Trip Lock condition, read the
Alarm Status register for more information.
Derating status (reg. 40123 and 40124):
Bit 0, Derating - Drive Temperature High
The temperature measured in the drive’s power electronics
has reached a critical level and the drive cannot maintain
full capacity output. Therefore the drive slows the
compressor down until the temperature is no longer
critical. When temperatures have normalized the drive
attempts to return to normal operation.
Bit 2, Derating - Suction Pressure Low
The suction pressure (P0) has reached a critical low value.
To make the suction pressure recover, the drive has slowed
down the compressor. When the pressure has normalized
the drive will attempt to return to normal operation.
Bit 4, Derating - Condenser Pressure Low
The condenser pressure (Pc) has reached a critical low
value. To increase the condenser pressure, the drive has
slowed down the condenser fan speed. When the pressure
has normalized the drive will attempt to return to normal
operation. This function is only available in AC mode and
system configurations with condenser fan control.
Bit 5, Derating - Condenser Pressure High
The condenser pressure (Pc) has reached a critical high
value. To decrease the condenser pressure, the drive has
slowed down the compressor. When the pressure has
normalized the drive will attempt to return to normal
operation.
Bit 6, Derating – Output Power Limit
The supply voltage has dropped below 208 V or an
extreme operating condition, e.g. high condensing
pressure has activated the derating function limiting the
output power of the drive. The drive returns to normal
operation when the supply voltage has recovered or
operating conditions have normalized.
44MG10V402 - VLT® is a registered Danfoss trademark
Safe Mode Status (reg. 40125 and 40126):
Bit 0, Safe Mode - EEV Indoor Failure
The communication with the indoor EEV controller has
been interrupted and the EEV controller has switched to
autonomous mode to maintain the superheating. The bit
remains logic “one” for at least 60 s after the communication is reestablished, and the system will return to
normal operation when the bit becomes logic “zero”. For
information about EEV autonomous mode see EEV manual.
Bit 1, Safe Mode - EEV Outdoor Failure
The communication with the outdoor EEV controller has
been interrupted and the EEV controller has switched to
autonomous mode to maintain the superheating. The bit
remains logic “one” for at least 60 s after the communication is reestablished and the system will return to
normal operation when the bit becomes logic “zero”. For
information about EEV autonomous mode see EEV manual.
Bit 2, Safe Mode - Ambient Temperature Invalid
The reading of the ambient temperature sensor (S amb.) is
not within the specified sensor range of -60 to +100 °C
(-76 to +212 °F). Possible causes are faulty wiring or a
defect sensor. The bit remains logic “one” for at least 60 s
and the system will afterwards return to normal operation
when the bit becomes logic “zero”.
Bit 3, Safe Mode - Ambient Temperature not updated
40225 - External Ambient Temperature is selected as
ambient temperature source and has not been updated
within the last 60 s.
Alarm Status (reg. 40127 and 40128):
Bit 0, Alarm Peripherals Error
More than one Safe Mode condition is present.
Bit 1, Alarm Out of Envelope
The compressor has been operating outside the largest
possible operation envelope for too long time (60 or 90 s
depending on which envelope limit is violated). The
system will restart by itself after the restart timer has
elapsed (60 s). If 10 subsequent “Out of envelope” alarms
occur because of a low suction pressure (P0), the drive will
go into trip lock condition to prevent damage to the
system.
Bit 2, Alarm - Over Current
The drive has encountered an over current event and has
stopped operation. An over current can be triggered by a
phase loss, locked compressor rotor, an earth fault, a short
circuiting or a major drive error. An Earth fault triggers an
immediate trip lock, while other occurrences may happen
several times to trigger a trip lock condition.
Bit 3, Alarm – DC Link Voltage High
The drive has encountered an over voltage event (more
than 450 V) and has stopped operation. An over voltage
condition can happen due to a mains failure. 10
subsequent occurrences trigger a trip lock.
Bit 4, Alarm - Drive Temperature High
The drive has encountered an over temperature condition
and has stopped operation. An over temperature occurs
when the temperature measured inside the drive has
reached a critical level (> 115 °C/239 °F). Possible causes
are insufficient cooling due to a defect cooling fan,
blocked air circulation or extreme high ambient
temperature. This is an immediate trip lock condition.
Bit 5, Alarm – Supply Voltage Low
The supply voltage has dropped below 180 V and the
drive has stopped the compressor. When the supply
voltage has recovered, the drive resumes operation with
derating of the output power.
Bit 6, Alarm - Discharge Temperature High
The compressor discharge temperature (Sd) has exceeded
138 °C/280 °F and the system has been stopped. When the
temperature has normalized the drive will attempt to
return to normal operation. 10 subsequent occurrences
trigger a trip lock.
Bit 7, Alarm – Discharge Temperature Invalid
The reading of the discharge temperature sensor (Sd) is
not within the specified sensor range of -60 °C to +200 °C
(-76 °F to +392 °F). Possible causes are faulty wiring or a
defect sensor. The system will stop operation and return to
normal operation, when the problem has been fixed.
Bit 8, Alarm – OEM Communication Timeout
The OEM controller (thermostat) failed to read data within
a given time, set in register 40148. The drive stops
operating the system unless the time is set to 0 s, which
disables this function. The drive automatically resumes
operation when the communication has recovered and
data is received from the OEM controller, though waiting 2
minutes after communication has been reestablished.
Bit 9, Alarm – MOC Safety
When the motor-control-oriented micro processor safety
routines have encountered a fault (error) condition, the
system stops for safety reasons and goes to a trip lock
condition immediately.
Bit 10, Alarm – DC Link Voltage Low
The DC Link voltage in the drive has reached a critical low
level and the drive has stopped operation. When the DC
link voltage has recovered, the drive resumes operation.
Bit 11, Alarm – Suction Pressure Invalid
The reading of the suction pressure transmitter is not
within the specified sensor range of 0 to 16 bar (0 to 232
psi). Possible causes are faulty wiring or a defect
transmitter. The system stops operation and returns to
normal operation, when the problem has been resolved.
Bit 12, Alarm - Condenser Pressure Invalid
The reading of the condenser pressure transmitter is not
within the specified sensor range of 0 to 50 bar (0 to 725
psi). Possible causes are faulty wiring or a defect
transmitter. The system stops operation and returns to
normal operation, when the problem has been resolved.
Bit 13, Alarm – Condenser Pressure Low
If the condenser pressure remains at a critical low level
after the start-up sequence, the drive reports an alarm.
77
MG10V402 - VLT® is a registered Danfoss trademark45
Fault Conditions, Messages ...
This alarm indicated that the system has encountered a
loss of charge. If this alarm is subsequently reported 10
times the drive goes into a trip lock condition.
Bit 14, Alarm - Defrosting Timeout
If the system has operated in system Defrost mode for
more than 1800 s, the system stops. The drive enters a trip
lock condition.
Bit 15, Alarm - Restart too frequently
The amount of times that the compressor speed has been
0 Hz within 600 s is counted. When the counter reaches
the count of 6, the drive enters a trip lock condition.
Bit 31, Alarm – Internal Error
The drive has encountered an internal error, e.g. missing
communication between the microprocessors. The drive
goes immediately into a trip lock condition. It is likely that
the drive will not recover from this condition!
When operation the system in an open loop configuration
(by means sending a speed reference to the Performer VSD
application controller) the temperature controller in the
Modbus Master (thermostat) controller should feature an
Anti-Wind-up function that is activated whenever the drive
is in derating mode! In derating mode, the system cannot
satisfy the requested compressor speed and the integrator
of the PID-controller should be stopped until the system
has returned to normal operation.
NOTE
46MG10V402 - VLT® is a registered Danfoss trademark
Supply
Rated supply voltage 208-230/240 V (L1, L2) (min 180 V, max 264 V)
Mains frequency 50/60 Hz, single phase
Rated load amperage (RLA) (208 V):22A, 13 kW/3 t unit
28A, 16 kW/4 t unit
33A, 20 kW/5 t unit
Power Factor @230 V, full load> 0.98 (98%)
THiD< 22%
THvD< 3% (at typical mains impedance)
Earth leakage current (drive and compressor)<10 mA
Stand-by power consumption5W
Input power (at 208 V)
13 kW/3 ton unit4.5 kW
16 kW/4 ton unit5.6 kW
20 kW/5 ton unit6.7 kW
Cable length
The maximum allowable cable length between drive and compressor is 7 ft/2 m
Analog inputs (sensor inputs)
Digital output (condenser fan motor control), EXT_FAN:
PWM signal speed reference, duty cycle 15-100% speed.
Reversing valve relay, RLY_1:
NC/NO 3-pole relay, max. terminal load 250 V AC/24 V DC, 4 A
EEV Controller output (outdoor unit), EEV_2:
Internal power supply 24 V DC with ground RS-485 serial interface (Modbus)
RS-485 serial communication interface, MASTER and EEV_1:
According to Electronics Industry Association (EIA) standard.
Minimum power cycling time
The variable speed drive is equipped with an inrush circuit, limiting the starting (inrush) current when the system is
powered up.
CAUTION
Frequent cycling of power to the drive can damage the drive! Wait at least 5 minutes between cycles (connecting and
disconnecting power to the drive).
The OEM must place an equivalent notice on the unit!
Internal cooling fan
High performance variable speed cooling fan, supply voltage 16 V. Nominal operating point 74 CFM (126 m3/h) @ 89Pa
static pressure.
48MG10V402 - VLT® is a registered Danfoss trademark
Enclosure
The enclosure type of the variable speed drive is open chassis (IP00, no NEMA rating, according to NEMA 250-2003)
Storage conditions
Minimum storage temperature-35 °F/-30 °C
Maximum storage temperature140 °F/60 °C
Maximum storage humidity95% rH, non condensing
Operating temperature
Maximum temperature at cooling fan inlet125 °F/52 °C (for full capacity)
Maximum temperature at cooling fan inlet138 °F/60 °C (with capacity derating)
Minimum ambient temperature-13 °F/-25 °C
Humidity
According to IEC 60721-3-3, class 3K4, 95% rH
Altitude
The max. operation altitude (referring to the ambient barometric pressure) is 6000 ft/2000 m
Corrosion
The variable speed drive has been designed to comply with corrosion standard ASTM B117
Pollution
The variable speed drive has been designed to comply with IEC 61800-1, IEC 61800-2, IEC 61800-4 and 61800-5-1. Pollution
degree 2
Vibration
IEC 60068-2-6, 2007, environmental testing - Part 2-6: Tests - Test Fc: Vibration (sinusoidal) IEC 60068-2-64, 1993, test Fh:
vibration, broad-band Random (digital control) and guidance IEC 60605 series, equipment reliability testing
Test level:
Short term testing: 1.14 g RMS.
Long term testing : 0.99 g RMS.
Bump
Level40 g, half-sinusoidal
Duration10 ms
No. of pulses500 in each direction (x-y-z)
- of these, 250 along the positive direction, 250 along the negative direction.
Total: 1500 pulses.
99
Table 9.1 Bump Specifications
Shock
Level200 g, half-sinusoidal
Duration1 ms
No. of pulses6 in each direction (x-y-z)
- of these, 3 along the positive direction, 3 along the negative direction.
Total: 18 pulses.
Table 9.2 Shock Specifications
Immunity
In accordance with frequency converter standard IEC 61800-3
Harmonics
IEC 61000-3-12 and IEEE 519-1992
EMC
EN 55011 class A and EN 55014 (with ferrite)
MG10V402 - VLT® is a registered Danfoss trademark49
Derating at high ambient temperature/insufficient cooling
The drive is featuring an automatic derating function that
is activated when the internal temperature measured in
the drive reaches a certain threshold. This temperature is
not necessarily directly related to the ambient
temperature. In such case, the drive reduces the speed of
the compressor to reduce heat losses in the drive. If the
overtemperature does not clear, the drive eventually will
stop and report a fault condition. Possible causes could
also be a malfunction of the cooling fan or blocked airflow
(leaves). See also 11 Maintenance.
Derating at high installation altitude/low air pressure In
case of installing the drive in an altitude greater than 2000
m/6000 ft. cooling may become insufficient, if the ambient
temperature is at maximum at the same time (a very
unlikely coincidence).
10
Derating under unusual refrigeration process conditions
See Operating Instructions for the application controller.
50MG10V402 - VLT® is a registered Danfoss trademark
The Danfoss variable speed drive is maintenance-free over
its entire lifetime, except the internal cooling fan, that
eventually must be replaced depending on operation
hours and conditions. When an over-temperature alarm
occurs (see 7 Fault Conditions, Messages and Causes), a
possible cause could be a worn out or excessively
contaminated cooling fan that does not provide sufficient
air flow across the heat sink. If so, the fan must be
replaced with an original spare part.
11.1 Replacement of Internal Cooling Fan
NOTE
Disconnect power to the variable speed drive and wait for
5 minutes before commencing maintenance!
The fan is connected to high potential!
1.Carefully unplug the supply cable by lifting the
lock and retracting the plug (do not pull the
cable to retract the plug), see Illustration 11.2.
2.Lift the flat on the air duct to unlock the fan and
remove the fan (no tools required - see
Illustration 11.1).
3.Insert the plug of the new fan, make sure the
plug is locked.
4.Insert the new fan and click it onto the air duct.
5.Check that the fan runs properly after
reconnecting power and resuming operation.
Illustration 11.1 Unlock and Remove the Fan
Illustration 11.2 Unplug the Supply Cable
11.2 Cleaning
It is recommended to periodically check the drive and
especially the cooling fan for contamination with dust,
debris (i.e. leaves), insects etc.
NOTE
Do NOT use a water hose, high-pressure cleaner or
compressed air for cleaning purposes!
Using a water hose, high-pressure cleaner or compressed
air for cleaning, can damage the drive.
To clean the inlet grid, use a soft cloth or brush to wipe of
dust and dirt. Check proper function after cleaning.
11
11
MG10V402 - VLT® is a registered Danfoss trademark51
Service policy
The Danfoss variable speed drive is not field repairable. In case of malfunction or damage (i.e. caused by lightning), the
entire drive must be replaced with an original spare part.
WARNING
ELECTRICAL HAZARD
Disconnect power and wait at least 4 minutes to discharge
the DC-link capacitors before conducting service. Failure to
disconnecting power and observing the waiting time can
result in personal injury or death.
Spare part list
Replacement drive 13 kW/3 t unit176L0767
Replacement drive 16 kW/4 t unit176L0766
Replacement drive 20 kW/5 t unit176L0765
Internal cooling fan all sizes (176L0767/176L0766/176L0765)176L7003
1212
52MG10V402 - VLT® is a registered Danfoss trademark