Emerson ECB-D20 Manual

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Technical Information
Revision: Feb. 2019
OEM Solutions Development & Sales
ECB-D20 REFRIGERATION CONTROL SYSTEM FOR DISPLAY CABINETS

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ECB-D20 refrigeration control system for DISPLAY CABINETS .......................................................................1
1Safety notes...........................................................................................................................................4
2Basic configuration ................................................................................................................................4
2.1 Installation and wiring ........................................................................................................................ 4
2.2 Commissioning .................................................................................................................................. 4
3Introduction............................................................................................................................................5
4Assembly and installation......................................................................................................................6
4.1.1 Contact assignment....................................................................................................................... 6
.................................................................................................................................................................... 8
4.1.2 Relay.............................................................................................................................................. 8
4.1.3 High and low pressure switches.................................................................................................... 9
4.1.4 Alarm relay..................................................................................................................................... 9
4.2 Modbus communication..................................................................................................................... 9
4.2.1 Bus termination / polarization ...................................................................................................... 10
4.3Inputs/outputs .................................................................................................................................. 12
4.3.1 Relay outputs............................................................................................................................... 12
4.3.2 Display unit .................................................................................................................................. 12
4.3.3 Digital inputs ................................................................................................................................ 12
4.3.4 Compressor safety chain for high and low pressure switches .................................................... 12
4.3.5 Sensor inputs............................................................................................................................... 13
4.3.6 Electronic Expansion Valve (EXV)............................................................................................... 14
4.4 Communication / Modbus address.................................................................................................. 15
4.5 Digital Inputs.................................................................................................................................... 16
4.5.1 Defrost synchronization ............................................................................................................... 16
4.5.2 Configurable digital inputs ........................................................................................................... 16
4.5.2.1 Lighting controls (Day/Night operation) ................................................................................... 16
4.5.2.2 Bus alarm................................................................................................................................. 16
4.5.2.3 Door input ................................................................................................................................ 16
4.5.2.4 Standby mode.......................................................................................................................... 16
4.6 External Devices (Modbus Master) ................................................................................................. 17
4.6.1.1 Emerson ED3 Drive................................................................................................................. 18
4.6.1.2 Carlo Gavazzi Soft starter........................................................................................................ 18
4.6.1.3 EBM ESM Fan......................................................................................................................... 18
5Functions and parameters...................................................................................................................19
5.1 Parameter list description................................................................................................................ 19
6Display unit functions (ECD-D05/06)...................................................................................................34
6.1 Limited configuration parameters using display unit ....................................................................... 35
6.2 Configuration using display unit....................................................................................................... 35
6.3 Defrost request using keyboard....................................................................................................... 36
6.4 Temporary daytime operation using keyboard................................................................................ 36
6.5 Standby (cleaning mode) using keyboard....................................................................................... 36
7Setting of real-time clock .....................................................................................................................36
8Defrost .................................................................................................................................................36
8.1 Defrost controls................................................................................................................................ 36
8.2 Defrost sequence............................................................................................................................. 36
8.3 Defrost process................................................................................................................................ 37
8.4 Termination of the defrost process.................................................................................................. 37
8.5 Defrost monitoring ........................................................................................................................... 37
8.6 Defrost start using real-time clock ................................................................................................... 38
8.7 Defrost synchronization................................................................................................................... 38
9Alarms..................................................................................................................................................39
9.1 Hardware alarms ............................................................................................................................. 40
9.2 Software alarms............................................................................................................................... 40
9.3 Critical alarms.................................................................................................................................. 41
10 Technical data .....................................................................................................................................42

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Tables
Table 1: Connector assignment..................................................................................................................... 7
Table 2: Logic safety chain............................................................................................................................. 9
Table 3: Modbus DIP switches..................................................................................................................... 15
Table 4: Modbus Addresses............................................................................................................................ 15
Table 5: Defrost Modes ................................................................................................................................... 27
Table 6: Relay Functions................................................................................................................................. 31
Table 7: Digital Input Configuration ................................................................................................................. 31
Table 8: Alarm Codes...................................................................................................................................... 39
Table 9: Technical Data................................................................................................................................... 42
Figures
Figure 1 Refrigeration cycle............................................................................................................................... 5
Figure 2 Connector position on PCB................................................................................................................. 8
Figure 3 Modbus wiring ..................................................................................................................................... 9
Figure 4 RJ 45 to XJ485USB adapter cable.................................................................................................... 10
Figure 5 Jumpers............................................................................................................................................. 10
Figure 6 Bus termination.................................................................................................................................. 11
Figure 7: Safety Concept................................................................................................................................. 12
Figure 8: Sensor positions............................................................................................................................... 13
Figure 9: EXV Connection............................................................................................................................... 14
Figure 10: EXM/EXL-246 Windings................................................................................................................. 14
Figure 11: DIP switch....................................................................................................................................... 16
Figure 12 Internal Modbus Wiring................................................................................................................ 17
Figure 13 Fixed speed control......................................................................................................................... 19
Figure 14 Variable speed control..................................................................................................................... 19
Figure 15 Fix speed control............................................................................................................................. 20
Figure 16 Variable speed control..................................................................................................................... 20
Figure 17: Shift of Defrost Interval’s by ModBus Address............................................................................... 22
Figure 18: Demand Defrost Detection............................................................................................................. 25
Figure 19: Deadband Control .......................................................................................................................... 26
Figure 20: Synchronized Defrost..................................................................................................................... 28
Figure 21: Pack Defrost Compressor Delay at Hot Gas Defrost..................................................................... 28
Figure 22: Pack Cycle Compressor Delay at Thermostat Emergency Operation........................................... 29
Figure 23: Pack Controller Dead Band Mode.................................................................................................. 29
Figure 24: Pack Controller Percentage Mode ................................................................................................. 29
Figure 25 Pack One-shot Mode....................................................................................................................... 33
Figure 26 Hotgas defrost sequence with / without 4way-Valve switching....................................................... 34
Figure 27: Display unit ECD-D05/06 ............................................................................................................... 34
Figure 28: Defrost Phases............................................................................................................................... 37

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1 Safety notes
▪Please read these operating instructions carefully. Failure to comply with these instructions can
lead to the destruction of the system or injuries to personnel.
▪Installation may only be performed by trained professionals.
▪The system must be powered down prior to wiring.
▪Please observe the relevant guidelines on the installation of electrical systems and facilities.
▪The system may only be commissioned once all necessary connections have been made.
2 Basic configuration
The cabinet control system may only be connected to the power supply after all wiring operations have been
completed and the DIP switch has been set accordingly.
2.1 Installation and wiring
▪All connectors are provided with coding in o rder to prevent incorrect wiring.
▪Connect the sensors to the corresponding connectors.
▪Insert the cable of the expansion valve, if present, into the corresponding connector.
▪Connect the pressure switches for low pressure and high pressure. Important! The pressure switches
must not have been tripped, because otherwise the compressor cannot be started.
▪Connect 230V electrical loads. Observe the maximum permissible currents:
▪Set the DIP switches for Modbus communication.
▪Connect the 230V power supply.
2.2 Commissioning
▪Only turn the system on after it has been wired completely and the DIP switch has been set.
▪Set the configuration parameters using the Modbus interface.
▪The cabinet control system can be tested using the Modbus interface. For more information, please
consult the Modbus documentation.
▪Start the system and check the operating conditions.

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3 Introduction
The ECB-D20 controller is designed for display cabinets with scroll compressors and heat recovery by air or
water. The cabinet control system can be used for evaporator control purposes using an electronic unipolar
stepper motor valve or a thermostatic valve in conjunction with a solenoid valve. When operating multiple
refrigeration units, the automatic defrost synchronization function can be handled using a hardware link or an
external monitoring system. The condensing pressure and/or temperature can be controlled using a three-
way valve in case of water cooling or a fan control system in case of air cooling. The controller is equipped
with a day/night program so that different setpoint values can be entered. A control function for lighting and
night blinds is also integrated.
Figure 1 Refrigeration cycle
Water connection couplings
Water-cooled
condenser
Filter dryer
Collector
MV
Sight glass
Compress
or
Or EXV with
stepper motor
TXV
Defrost heater
Evaporator
p<
p>
T
P
T
P

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4 Assembly and installation
4.1.1 Contact assignment
Con.
Type
Designation
Terminals
J1
RAST5 3-pin multipoint connector
115-230V AC power supply
1 = N conductor
2 = PE conductor
3 = L conductor
Stocko: 00A
J19
RAST5 3-pin multipoint connector
Alarm relay
1 = normally open
2 = common
3 = normally closed
Stocko: 00F
J5
RAST5 10-pin multipoint
connector
Relay 1
1 = common
2 = normally open
Stocko: 044
Stocko: 021
Relay 2
3 = common
4 = normally open
Stocko: 00F
Relay 3
5 = common
6 = normally open
Stocko: 049
Relay 4
7 = common
8 = normally open
Stocko: 001
Relay 5
9 = common
10 = normally open
J14
RAST5 8-pin multipoint connector
Relay 6
1 = common
2 = normally open
Stocko: 064
Stocko: 045
Relay 7
3 = common
4 = normally open
Stocko: 036
Relay 8
5 = common
6 = normally open
Stocko: 054
Safety relay
7 = common
8 = normally open
J21
RAST5 2-pin multipoint connector
High pressure switch
1 = 24 V DC
2 = input
Stocko: 002
J22
RAST5 2-pin multipoint connector
Low pressure switch
1 = J21.2
2 = input
Stocko: 002
J23
RAST5 2-pin multipoint connector
Digital input 1
1 = input
2 = input
Stocko: 037
Lumberg: Kxx
J24
RAST5 2-pin multipoint connector
Digital input 2
1 = input
2 = input
Stocko: 053
J17
RAST2.5 3-pin socket connectors
Discharge pressure sensor
1 = 4-20 mA
2 = 24V DC
3 = GND
Stocko: 003
J2
RAST2.5 3-pin socket connectors
Suction pressure sensor
1 = 4-20 mA
2 = 24V DC
3 = GND
Stocko: 033
J15
RAST2.5 3-pin socket connectors
Configurable sensor input 2
(Suction gas temperature / Fin 3 temp.)
1 = 3.3V DC
2 = open
3 = GND
Stocko: 004
J13
RAST2.5 3-pin socket connectors
Configurable sensor input 1
(Discharge temp / Fin 2 temp.)
1 = 3.3V DC
2 = open
3 = GND
Stocko: 005
J10
RAST2.5 3-pin socket connectors
Equipment temperature
1 = 3.3V DC
2 = open
3 = GND
Stocko: 007

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Table 1: Connector assignment
J8
RAST2.5 3-pin socket connectors
Evaporator temperature
1 = 3.3V DC
2 = open
3 = GND
Stocko: 008
J6
RAST2.5 3-pin socket connectors
Air out temperature
1 = 3.3V DC
2 = open
3 = GND
Stocko: 009
J3
RAST2.5 3-pin socket connectors
Air in temperature
1 = 24V DC
2 = 4-20 mA
3 = GND
Stocko: 004
J20
RAST2.5 3-pin socket connectors
Display unit ECD-05
1 = +12V DC
2 = open
3 = GND
Stocko: 005
J26
RAST2.5 3-pin socket connectors
24 V/0.5 A power supply
1 = +24V DC
2 = open
3 = GND
Stocko: 007
J30
JST B6B
Electronic expansion valve (EXV)
1 = +24V DC red
2 = +24V DC brown
3 = coil 1 blue
4 = coil 1 orange
5 = coil 2 yellow
6 = coil 2 white
J25
RAST5 2-pin multipoint connector
Synchronized defrost
1 = + 8V DC
2 = GNDIS
Stocko: 050
J27
RAST5 2-pin multipoint connector
RS485 communication, Modbus Master
1 = Modbus A
2 = Modbus B
3 = Modbus GND
Stocko: 008
JP1
JP2
RJ45
RS485 communication, Inter Cabinet BUS
1 = n.c.
2 = n.c.
3 = n.c.
4 = Modbus A
5 = Modbus B
6 = n.c.
7 = n.c.
8 = Modbus GND
J3 / J4
Header rows
Optional communication interface
J7 / J8
Header rows
Optional output interface (EXM, relay)

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Figure 2 Connector position on PCB
Internal power supply (3.3 V)
If the green "3.3V" LED is illuminated, the internal power supply has been established.
4.1.2 Relay
One LED is positioned in front of each relay to indicate the relay status. The LED illuminates when a relay is
energized.
Relay activated
Modbus activity
Master - Slave
Display ECD-05
Short-circuit proof output
(future use)
EXV
Synchronized defrost
Modbus Master COM
(future use)
Modbus Slave COM
Modbus Slave COM
Safety Relay
Relay 8
Relay 7
Relay 6
Relay 5
Relay 4
Relay 3
Relay 2
Relay 1
Alarm relay
Power supply
Disch. P
Suc. P
Suc. T / Fin 3 T
Disch. T / Fin 2 T
Cabinet T
Fin T
Air Out T
Air In T
HP switch
LP switch
Digital Input 1
Digital Input 2

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4.1.3 High and low pressure switches
The PCB has inputs for high and low pressure switches. The state of the LED concerned as well as the safety
relay status are indicated by the following table.
High pressure
switch
Low pressure
switch
High
pressure
LED
Low
pressure
LED
Safety relay
closed
closed
on
on
closed
closed
open
on
off
open
open
closed
off
off
open
open
open
off
off
open
Table 2: Logic safety chain
4.1.4 Alarm relay
The alarm relay operates in a fail safe mode. If no alarm is triggered, the relay is activated and the LED is illuminated.
4.2 Modbus communication
All configuration on the controller is done via Modbus / Monitoring System. If the controller is connected to
Modbus communication, activity is indicated by the green LED next to the micro controller. A receiving data
status is indicated by a flashing LED.
The principle setup is shown in the next picture:
Figure 3 Modbus wiring

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Figure 4 RJ 45 to XJ485USB adapter cable
4.2.1 Bus termination / polarization
When building up a Modbus communication with several boards it is beneficial to terminate the bus at the
last board in line with a resistor. This is done by placing a jumper on the board. The pin connectors are
located close to the RJ 45 terminals. In some cases (disturbances on the bus), it could be also helpful to
polarize the bus with two additional jumpers at one controller on the bus.
Figure 5 Jumpers

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A principle setup where to place the termination jumper is shown in Figure 5:
Figure 6 Bus termination

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4.3 Inputs/outputs
4.3.1 Relay outputs
All relay outputs are potential-free normally open contacts with "RAST 5" connectors. The connections are
listed in Table 1 "Connector assignment".
The relays 6, 7, 8 and the alarm relay are additionally actuated by a watchdog timer. In the event of a micro
controller fault, these relays are deenergized after approx. 1s preventing any unsafe working condition of the
cabinet.
To avoid wiring errors, coding on the individual connectors ensures that they can only be connected to their
matching partner.
4.3.2 Display unit
Only the corresponding Emerson temperature display module is supported (ECD-05). An Emerson specific
short-circuit proof 1-bit bus is used as the transmission protocol.
4.3.3 Digital inputs
Two digital inputs are provided on RAST 5 connector strips. (J23 / J24)
The digital inputs are active inputs and can be powered by 24 V to 230 V (AC/DC). Coding on the individual
connectors ensures that they can only be connected to their matching partner. This helps avoid any wiring
errors.
4.3.4 Compressor safety chain for high and low pressure switches
The safety chain internally operates at 24 V DC. The outputs are short-circuit proof. If the safety chain is closed,
both green LEDs on the inputs for high and low pressure switches are illuminated and the safety relay is closed.
Additionally, the safety chain is controlled by a watchdog timer. In case of an internal fault of the microprocessor
the safety relay is switched of automatically.
Figure 7: Safety Concept

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4.3.5 Sensor inputs
The pressure sensors have 2-wire connections and operate with a 4 to 20 mA signal. Every pressure sensor
input has its own 24 V DC power supply and is limited to max. 25 mA.
As temperature sensors 10K@25°C NTC sensors are used. The supply voltage for the NTC sensors is 3.3V
DC.
Figure 8: Sensor positions
S1: Suction gas sensor
S2: Air in sensor
S3: Air out sensor
S4: Fin sensor/defrost sensor
S5: Refrigeration unit temperature
S6: Discharge temperature
S4
S2
S1
S3
S6
S5

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4.3.6 Electronic Expansion Valve (EXV)
The controller module has an output for a unipolar electronic expansion valve (Emerson EXM/L) which is
controlled by a stepper motor.
Figure 9: EXV Connection
yellow brown blue
Figure 10: EXM/EXL-246 Windings
white
red
orange
M

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4.4 Communication / Modbus address
The default way of communication with the controller is by Modbus protocol. Each device on a Modbus line
needs a unique Address. All devices on one line must have the same baud rate and parity/ stop bits
configuration (161 Baud rate, 162 Parity / Stop bits). As a factory default the baud rate is set to 19200 baud/s,
even parity and one stop bit. If the baud rate and parity/ stop bit setup is unknown, it can be restored via the
display (see 6.2).
To set up the Modbus address by default DIP switches are used, another way to configure the address is via
a display or a Modbus Write-parameter. To activate a configuration via display/ parameter the DIP switches 1
–6 must be set to OFF. If the Modbus address of a controller is unknown, a fall back strategy is to set the
address via the DIP-switches.
Configuration via DIP switches
The first 6 DIP switches (1 –6) are used to set up a binary Address.
Function DIP switch number
1
2
3
4
5
6
7
8
Modbus address 1 to 63
0 is not permitted
x
x
x
x
x
x
-
-
Table 3: Modbus DIP switches
Modbus
Address
1
2
3
4
5
6
Modbus
Address
1
2
3
4
5
6
1
On
33
On
On
2
On
34
On
On
3
On
On
35
On
On
On
4
On
36
On
On
5
On
On
37
On
On
On
6
On
On
38
On
On
On
7
On
On
On
39
On
On
On
On
8
On
40
On
On
9
On
On
41
On
On
On
10
On
On
42
On
On
On
11
On
On
On
43
On
On
On
On
12
On
On
44
On
On
On
13
On
On
On
45
On
On
On
On
14
On
On
On
46
On
On
On
On
15
On
On
On
On
47
On
On
On
On
On
16
On
48
On
On
17
On
On
49
On
On
On
18
On
On
50
On
On
On
19
On
On
On
51
On
On
On
On
20
On
On
52
On
On
On
21
On
On
On
53
On
On
On
On
22
On
On
On
54
On
On
On
On
23
On
On
On
On
55
On
On
On
On
On
24
On
On
56
On
On
On
25
On
On
On
57
On
On
On
On
26
On
On
On
58
On
On
On
On
27
On
On
On
On
59
On
On
On
On
On
28
On
On
On
60
On
On
On
On
29
On
On
On
On
61
On
On
On
On
On
30
On
On
On
On
62
On
On
On
On
On
31
On
On
On
On
On
63
On
On
On
On
On
On
32
On
Table 4: Modbus Addresses

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Figure 11: DIP switch
Configuration via Display / Modbus
If DIP switch 1 –6 are OFF the configuration of the Modbus address is done via display configuration (see
6.2) respectively Modbus Write-parameter 543.
4.5 Digital Inputs
4.5.1 Defrost synchronization
The defrost synchronization is a simple 1-bit bus function. The 8 V DC bus supply is provided separately by
the internal power supply (SELV).
Defrost groups can be established by a hardware connection of all cabinets in one group via the “Synchronized
defrost” connector. The first device in the defrost group that triggers a defrost cycle causes defrost of all other
cabinets in the same group. A defrost cycle can be started using the real-time clock, interval timer or a Modbus
command. At the end of the defrost cycle, the last device in the defrost group starts refrigeration operation
again for the remaining cabinets in the defrost group.
4.5.2 Configurable digital inputs
Two digital inputs are configurable. For now four functions can be dedicated to these inputs.
4.5.2.1 Lighting controls (Day/Night operation)
Without any activation, the cabinet lighting is off and the night blinds are closed. Lighting can be turned on
and the night blinds can be opened using an external contact or Modbus command.
4.5.2.2 Bus alarm
This input is used as an external alarm. This function is currently used as a gas alarm. In case of a gas alarm
the hybrid fan will be switched on (only relevant for air-cooled cabinets).
4.5.2.3 Door input
The logical function of the door input is configurable. It can be a “NO” normal open or “NC” normal closed
contact. When the door input is activated, the compressor(s) and the fans are switched off. By releasing the
contact the cooling is activated and the fans are switched on again. In addition, a restart time delay can be
configured. If the delay time elapsed cooling is active and the fans are switched on even if the door is still
open. If a second delay time expires, the door open alarm is activated.
4.5.2.4 Standby mode
The standby mode can be active by an additional switch or a Modbus command. By entering this mode
cooling is terminated and all compressors are stopped. The fans and the light is switched off, the night
curtain moves up if down. All “Software alarms” like “high temperature” are cleared by entering the standby
mode and not evaluated in this state. Only “hardware alarms” will be indicated. The cabinet is not reacting on
the day/night input.

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4.6 External Devices (Modbus Master)
ECB D20ECB D20
CG RSBT
RS485
CG RSBT
RS485
EBM ESMEBM ESM
ED 3ED 3
Modbus
Figure 12 Internal Modbus Wiring
The baud rate on the Modbus Master plug in is fixed to 19200 Baud, “Even” parity and one stop bit. To run
external devices, it is necessary to set a unique Modbus address but equal Baud rate, Stop bit and parity
configuration in the proprietary configuration procedure of each device. After that the devices can connected
to the bus. The address of each device must be set in the configuration of the ECB-D10. By the next reset of
the board automatically all devices are configured in a proper way by the controller. The current implemented
devices are:
•Variable speed drive, Emerson ED3015A
•Soft starter, Carlo Gavazzi RSBT4025EVC
•EC Fan, EBM ESM

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4.6.1.1 Emerson ED3 Drive
One Emerson ED3 drive can be connected to the Modbus master interface. The default Modbus address is
45, which is the factory default address of the drive. If required this address can be changed in the
configuration of the controller and the drive (separate description file).
At start up, the controller set to the configured package code (compressor + drive + application envelope),
the discharge line temperature protection to 120 °C and the speed up and down rate to the configured
values.
The available information on the controller are:
•Package code
•Compressor speed
•Requested compressor speed
•Hardware, system, compressor and PFC failure
•Drive status
•Discharge line temperature
In case of a communication failure, the compressor is stopped.
4.6.1.2 Carlo Gavazzi Soft starter
Up to three soft starters can be connected to the Modbus master interface. The Modbus address must be set
in the configuration. A Modbus address of 0 means that the soft starter is not available. The Carlo Gavazzi
soft starter allows to switch the compressor via Modbus command and get a feedback of the compressor
status. To use CG soft starters the compressor command type must be set to soft starters.
At start up, the controller set the heart beat function and the refresh interval (10 s). This means that in case
there is no live beat from the controller for 10 s the soft starter is tripping.
The available information on the controller are:
•Status
•Voltage L1 –L3
•Power
•Alarms
In case of a communication failure to a soft starter the controller will entering alarm mode.
4.6.1.3 EBM ESM Fan
Up to six ESM fans can be connected to the Modbus master interface. The Modbus address must be set in
the configuration. A Modbus address of 0 means that the fan is not available. In case of a communication
failure the ESM fan continue to run on the speed configured at the last startup of the controller (emergency
function).
The available information on the controller are:
•Status
•Speed

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5 Functions and parameters
More information as minimum, maximum and default values could be found in the Modbus documentation.
Example:
Modbus address Parameter
Functional description
5.1 Parameter list description
1Day temperature setpoint
This parameter defines the temperature set point for the cabinet during day operation mode. Depending on
the compressor type this parameter has a different meaning.
Fixed speed compressor: The temperature control is done by a dead band controller. This parameter defines
the cut off temperature for the compressor. The cut on temperature is this parameter plus the day temperature
difference (57 Day temperature difference) In case of a sensor failure, the dead band controller runs in cycle
mode.
Thermostat
off
Thermostat
on
Set point Difference
Control Temperature
Figure 13 Fixed speed control
Variable speed compressor: The temperature control is done by a PI controller. This parameter defines the
temperature set point, which is the middle of the P band. The cut off temperature (compressor off) is this
parameter minus ½ of the day temperature difference (57 Day temperature difference). In case of a sensor
failure the PI controller runs with 50% speed. For variable speed applications it is recommended to use a
wider band (~5K) to prevent cut offs after defrost. The cut off band (½ of the temperature difference) is not
influencing the accuracy of PI temperature control. It is only relevant in case the losses of the cabinet are
lower than the cooling capacity at minimum speed. In this case a freezing of the goods is prevented.
0%
Set point +1/2 Difference-1/2 Difference
100%
Speed
Figure 14 Variable speed control
2Mean value (daytime operation)
Selection of measuring sensors for controlling the air temperature. Air inlet or air outlet during daytime
operation.
Control temperature = air inlet + ([air outlet - air inlet] x Mean value / 100)

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Technical Information
3Night temperature setpoint
This parameter defines the temperature set point for the cabinet during night operation mode. Depending on
the compressor type this parameter has a different meaning.
Fixed speed compressor: The temperature control is done by a dead band controller. This parameter defines
the cut off temperature for the compressor. The cut on temperature is this parameter plus the night
temperature difference (57 Night temperature difference). In case of a sensor failure, the dead band
controller runs in cycle mode.
Thermostat
off
Thermostat
on
Set point Difference
Control Temperature
Figure 15 Fix speed control
Variable speed compressor: The temperature control is done by a PI controller. This parameter defines the
temperature set point, which is the middle of the P band. The cut off temperature (compressor off) is this
parameter minus ½ of the night temperature difference (57 Night temperature difference). In case of a
sensor failure the PI controller runs with 50% speed. For variable speed applications it is recommended to
use a wider band (~5K) to prevent cut offs after defrost. The cut off band (½ of the temperature difference) is
not influencing the accuracy of PI temperature control. It is only relevant in case the losses of the cabinet are
lower than the cooling capacity at minimum speed. In this case a freezing of the goods is prevented.
0%
Set point +1/2 Difference-1/2 Difference
100%
Speed
Figure 16 Variable speed control
4Mean value (nighttime operation)
Selection of measuring sensors for controlling the air temperature via air inlet or air outlet during nighttime
operation.
Control temperature = air inlet + ([air outlet - air inlet] x Mean value / 100)
5Temporary day duration
Using the button on the display unit or a Modbus command, it is possible to trigger a time-limited daytime
operation for loading goods into the equipment during nighttime operation. After the configured amount of time
has expired, the cabinet returns to nighttime operation.
6Condensing pressure set point
Threshold value for a cut off hybrid fans. If the pressure drops below this threshold the hybrid fan is switched
off.
7Condensing pressure difference
The hybrid fan is activated when the setpoint value + dead band is exceeded. This function is only active if the
hybrid fan is configured for condensing pressure control.