Danfoss EKC 361 User manual

REFRIGERATION AND
AIR CONDITIONING
Controller for regulation
of media temperature
EKC 361
Manual

2 Manual RS8AE802 © Danfoss 12-2009 EKC 361
Introduction
Application
The controller and valve can be used where there are stringent
requirements to accurate temperature control in connection with
refrigeration.
E.g.:
• Cold room for fruits and food products
• Refrigerating systems
• Work premises in the food industry
• Process cooling of liquids
Advantages
• The temperature is kept within an accuracy of ±0.25°C or better
after a transient phenomenon
• The evaporator's temperature is kept as high as possible, so that
the air humidity is kept high and waste is limited
• A transient phenomenon can be controlled with the adaptive
function. Select either:
- Fast build-up where underswings are allowed
- Not quite so fast build-up where underswings are less pro-
nounced
- Build-up without underswings
• PID regulation
• p0limitation
Functions
• Modulating temperature control
• Digital ON/OFF input for start/stop of regulation ICS/PM or
forced closing of ICM
• Alarm if the set alarm limits are exceeded
• Relay output for fan
• Relay output for solenoid valves
• Analog input signal that can displace the temperature reference
• Analog Output signal corresponding to selecting temperature
as running display value. Please observe : Not possible if ICM is
selected as valve
Start/
stop
ICS or PM

EKC 361 Manual RS8AE802 © Danfoss 12-2009 3
Application examples
ICS/PM
ISC/PM with CVQ is a pilot-operated and pressure-dependent
valve for for controlling media temperature.
The ICS or PM must be equipped with a CVQ pilot valve in order
to position ICS or PM. The CVQ valve is operated by the EKC 361
controller.
Please notice that a power failure will cause the CVQ pilot valve to
fully open ICS/PM. If it is required that ICS/PM must close at power
failure, the pilot valve type EVM-NC can be installed.
If the Digital Input is ON, it releases the ICS/PM for controlling
temperature. If the Digital Input is OFF, if stops controlling PM/ICS,
but EKC 361 will maintain a CVQ mimimum temperature. (Param-
eter n02)
Please see seperate literature for ICS/PM
ICS : RD4YA
PM : RD4XA
ICM
ICM is a direct activating and pressure independent valve for con-
trolling media temperature.
When ICM is selected, the ICM is positioned directly via the analog
output 0/4-20mA output from the EKC 361.
If the Digital Input is ON, it releases the ICM for controlling tem-
perature. If the Digital Input is OFF, the ICM is forced to close.
The opening degree OD 0-100 % can be limited by parameter n32
and n33.
Please see seperate literature for ICM
ICM : RD4YB
General for ICS/PM and ICM
The EKC 361 can also operate a solenoid valve in the liquid line
(Digital output on terminal 9 and 10). It will follow the status of
Digital Input, however if a low temperature alarm is detected (A2
alarm) the solenoid valve in the liquid line will be closed.
The EKC 361 can also operate a fan (Digital output on terminal 8
and 10). It will follow the status of Digital Input.
The Parameter (r12) must be ON in order to ensure general opera-
tion. If Parameter (r12) is OFF, EKC 361 will operate corresponding
to if Digital Input is OFF
As media temperature sensor is Sair is used. Please observe that Sair
can also be used to control liquid.
As option an auxiliary temperature sensor Saux can be installed
but only for monitoring.
Sair/Saux can both be shown as running display value selected by
parameter o17. The selected sensor (Sair or Saux) will be sent
out on the Analog Output as 0/4-20 mA.
Temperature scaling with parameter o27 and o28. Please observe
by ICM the Analog Output is not available for sending temperature
signals (Sair or Saux).
It is normally recommended, on a aircooler, to install Sair, at the
evaporator air outlet side.
Extra options
• PC operation
The controller can be provided with data communication, so
that it may be hooked up with other products in the ADAP-
KOOL® range of refrigeration controls. Operation, moni toring
and data collection can then be performed from a PC - either in
situ or at a service company.

4 Manual RS8AE802 © Danfoss 12-2009 EKC 361
Function
Very accurate temperature control
With this system where controller, pilot valve and main valve have
been adapted for optimum use in the refrigerating plant, the re-
frigerated products may be stored with temperature uctuations
of less than ±0.25°C.
High air humidity
As the evaporating temperature is constantly adapted to the
refrigeration needs and will always be as high as possible with a
very small temperature uctuation, the relative air humidity in the
room will be kept at a maximum.
Drying-out of the products will in this way be reduced to a mini-
mum.
Temperature is quickly attained
With the built-in PID control and the possibility of choosing be-
tween three transient phenomena, the controller can be adapted
to a kind of temperature performance that is optimum for this
particular refrigerating plant. See parameter (n07).
• Fastest possible cooling
• Cooling with less underswing
• Cooling where underswing is unwanted.
Regulation ICS/PM with CVQ
The controller receives signals from room sensor Sair. This room
sensor must be placed at the air outlet from the evaporator to
obtain the best possible regulation. The controller sees to it that
the required room temperature is maintained.
Built-in between the controller and the actuator is a so-called
inner control loop which constantly checks the temperature (pres-
sure) in the actuator’s pressure vessel. In this way a very stable
control system is obtained.
If there is a deviation between the required and the registered
temperature the controller will immediately send more or fewer
pulses to the actuator to counteract the error. A change of the
number of pulses will act on the temperature and hence the
pressure in the pressure vessel. As the charging pressure and the
evaporating pressure p0 follow each other, a changed charging
pressure will produce the effect that the valve’s opening degree is
also changed. The ICS/PM with CVQ system maintains the pressure
in the evaporator whatever pressure changes there may be on the
suction side (on the ICS/PM valve’s outlet).
Evaporating pressure limitation (p0limitation)
The inner control loop mentioned above also causes the evapora-
ting pressure to stay within a xed limit. In this way the system is
safeguarded against a too low supply air temperature.
It oers the following advantages:
- High-temperature systems can be connected to low-tempera ture
compressor units
- Protection against icing on evaporator
- Frost protection of liquid coolers
Regulation with ICM
When using ICM as selected valve the system will still control ICM
in order to maintain Sair according to entered setpoint.
This system does not inlude any inner control loop.
It is a direct operating and pressure independent valve for control-
ling media temperatur. (Sair).
The allowed temperature in the actuator determines the evaporating pressure
Actuator temperature

EKC 361 Manual RS8AE802 © Danfoss 12-2009 5
Survey of functions
Function Para-
meter
Parameter by operation via data com-
munication
Normal display
Normally Sair (017=Air) will be shown as running display value. If lower button is activated
Saux will be displayed for 5 sec, and then return to Sair
If (017=Au) Saux will be shown as running display value. If lower button is activated
Sair will be displayed for 5 sec, and then return to Saux
If ICM has been selected (n03=6)
If (017=Air) Sair (017=Air) will be shown as running display value. If lower button is activated OD
(u24) will be displayed for 5 sec, and then return to Sair.
If (017=Au) OD (u24) will be shown as running display value. If lower button is activated Sair will
be displayed for 5 sec, and then return to OD (u24)
Air temp.
Reference
Setpoint
Regulation is performed based on the set value provided that there is no external contribution
(o10).
(Push both buttons simultaneously to set the setpoint).
-SP Temp.
Temperature unit
Here you select whether the controller is to indicate the temperature values in °C or in °F. If indi-
cation in °F is selected, other temperature settings will also change over to Fahrenheit, either as
absolute values or as delta values.
r05 Temp unit
°C=0,
°F=1
(In AKM only °C is displayed whatever the
setting)
External contribution to the setpoint
This setting determines how large a contribution (in °C/°F) is to be added to the set setpoint
when the input signal is max. (20 mA).
r06 Ext. Ref.o set (°C/°F)
Correction of signal from Sair
(Compensation possibility through long sensor cable).
r09 Adjust SAir (°C/°F)
Correction of signal from Saux
(Compensation possibility through long sensor cable).
r10 Adjust SAux (°C/°F)
Start/stop of refrigeration
With this setting refrigeration can be started and stopped. Start/stop of refrigeration can also be
accomplished with the external switch function. See also appendix 1.
r12 Main Switch
Alarm
The controller can give alarm in dierent situations. When there is an alarm all the light-emitting
diodes (LED) will ash on the controller front panel, and the alarm relay will cut in.
Alarm for upper deviation
The alarm for too high Sair temperature is set here. The value is set in Kelvin. The alarm becomes
active when the Sair temperature exceeds the actual reference plus A01. (The actual reference (SP
+ r06) can be seen in u02).
A01 Upper deviation
Alarm for lower deviation
The alarm for too low Sair temperature is set here. The value is set in Kelvin. The alarm becomes
active when the Sair temperature drops below the actual reference minus A02. If a low tempera-
ture alarm is detected (A2 alarm) the solenoid valve in the liquid line (Digital output on terminal
9 and 10) will be closed
A02 Lower deviation
Alarm delay
If one of the two limit values is exceeded, a timer function will commence. The alarm will not
become active until the set time delay has been passed. The time delay is set in minutes.
A03 Temp alarm delay
With data communication the importance
of the individual alarms can be dened.
Setting is carried out in the “Alarm destina-
tions”menu. See also page 10.
Control parameters
Actuator’s max. temperature
Set the temperature (°C) the actuator is to have at the limit of the regulating range. The setting
ensures that the actuator will not become superheated and work itself away from the regulating
range. Due to tolerances in the actuator the value must be set 10K higher than indicated in the
curves on page 11.
n01 Q-max. temp.
Actuator’s min. temperature
Set the temperature (°C) the actuator will have at the limit of the regulating range. The setting
ensures that the actuator will not become too cold and work itself away from the regulating
range. Due to tolerances in the actuator the value must be set 10K lower than indicated in the
curves on page 11.
n02 Q-min. temp.

6 Manual RS8AE802 © Danfoss 12-2009 EKC 361
Actuator type
Here you dene the actuator mounted in the system:
1: CVQ -1-5 bar
2: CVQ 0-6 bar
3: CVQ 1.7-8 bar
4: CVMQ
5: KVQ
6: ICM
n03 Valve type
P: Amplification factor Kp
If the Kp value is reduced the regulation becomes slower.
n04 Kp factor
I: Integration time Tn
The I-setting can be cancelled by setting the value to max. (600s). If it is set to 600s, parameter
n07 must be set to “0”. (If the Tn value is increased the regulation becomes slower).
n05 Tn sec.
D: Differentiation time Td
The D-setting can be cancelled by setting the value to min. (0).
n06 Td sec.
Transient phenomenon
If the refrigeration requires a very fast transient phenomenon or must not have an underswing or
temperature shift, this function can be used. (see page 4)
0: Ordinary regulating technique
1: Fast building-up where a minor underswing is allowed
2: Not quite so fast building-up, but without underswing
n07 Q-ctrl. mode
OD - Opening degree Max. Limitation - ICM only
When ICM has been selected (n03=6) the Maximum OD can be entered. ICM will never go above
this value. (If n32=n33, ICM is forced to this value)
n32 ICM OD Max.
OD - Opening degree Min. Limitation - ICM only
When ICM has been selected (n03=6) the Minimum OD can be entered. ICM will never go below
this value. (If n32=n33, ICM is forced to this value)
n33 ICM OD Min.
Miscellaneous
Output signal
The controller can transmit a current signal via the analog output (terminal 2 and 5). Range of
current signal can be selected below:
If (017=Air) Sair will send out to the analog output.
If (017=Au) Saux will send out to the analog output
Sair/Saux min. value (0 or 4 mA) will correspond to the setting in "o27"
Sair/Saux max. value (20 mA) will correspond to the setting in "o28"
If ICM has been selected (n03=6)
OD (u24) to control ICM, is send out to the analog output
(o27) and (o28) is not active
Range for current signal:
0: No output signal
1: 4-20 mA
2: 0-20 mA
o09 AO type
Input signal
If you wish to connect a signal that is to displace the controller’s control reference, the signal
must be dened in this menu.
0: No signal
1: 4-20 mA
2: 0-20 mA
(4 or 0 mA will not give a displacement. 20 mA will displace the reference by the value set in
menu r06).
o10 AI type
Data communication
If the controller is built into a network with data communication, it must have an address, and
the master gateway of the data communication must then know this address.
These settings can only be made when a data communication module has been mounted in the
controller and the installation of the data communication cable has been completed.
This installation is mentioned in a separate document “RC8AC”.
Following installation of a data communica-
tion module, the controller can be operated
on a par with the other controllers in ADAP-
KOOL® refrigeration controls.
The address is set between 1 and 60 o03 -
The address is sent to the gateway when the menu is set in pos. ON
(The setting will automatically change back to O after a few seconds.)
o04 -
Language
This setting is only required if data communication is connected to the controller.
Settings: 0=English, 1=German, 2=French, 3=Danish, 4=Spanish and 6=Swedish
When the controller is operated via data communication, the texts in the right-hand column will
be shown in the selected language.
When you change the setting to an other language you must activate o04 before "the new
language" can be visible from the AKM program.
o11 Language
Frequency
Set the net frequency.
o12 50 / 60 Hz
(50=0, 60=1)

EKC 361 Manual RS8AE802 © Danfoss 12-2009 7
Selection of running display value
If Sair (017=Air) will be shown as running display value. If lower button is activated Saux will
be displayed for 5 sec, and then return to Sair
Sair will send out to the analog output. See also (o09),(o27),(o28)
If (017=Au) Saux will be shown as running display value. If lower button is activated Sair will
be displayed for 5 sec, and then return to Saux
Saux will send out to the analog output. See also (o09),(o27),(o28)
If ICM has been selected (n03=6)
If (017=Air) Sair (017=Air) will be shown as running display value. If lower button is activated
OD (u24) will be displayed for 5 sec, and then return to Sair
If (017=Au) OD (u24) will be shown as running display value. If lower button is activated
Sair will be displayed for 5 sec, and then return to OD (u24)
o17 Display Aux/Air
Aux =0
Air = 1
(Setting for the function o09)
Set the temperature value where the output signal must be minimum
(0 or 4 mA)
o27 Temp. at AO min.
(Setting for the function o09)
Set the temperature value where the output signal must be maximum (20 mA). (With a tem-
perature range of 50°C (dierential between the settings in o27 and o28) the dissolution will be
better than 0.1 °C. With 100°C the dissolution wil be better than 0.2°C.)
o28 Temp. at AO max.
Service
A number of controller values can be printed for use in a service situation
Read the temperature at the Sair sensor (calibrated value) u01 Air temp.
Read the control reference
(Setpoint + any contribution from external signal)
u02 Air reference
Read temperature at the Saux sensor (calibrated value)
(This showing can also be uploaded from the normal display, if you push the lowermost button
for almost a second)
u03 Aux. temp.
Read valve’s actuator temperature u04 Actuator temp.
Read reference for valve’s actuator temperature u05 Actuator Ref.
Read value of external current signal u06 AI mA
Read value of transmitted current signal u08 AO mA
Read status of input DI (start/stop input) u10 DI
ICM opening degree.
Only active if (n03)=6
u24 OD%
-- DO1 Alarm
Read status of alarm relay
-- DO2 Cooling
Read status of relay for solenoid valve
-- DO3 Fan
Read status of relay for fan
Operating status
Operating status of the controller can be called forth in the display. Push briey (1s) the upper
button. If there is a status code, it will be shown on the display. (Status codes have lower priority
than alarm codes. In other words, you cannot see a status code, if there is an active alarm).
The individual status codes have the following meanings:
EKC State
(0 = regulation)
S10: Refrigeration stopped by the internal or external start/ stop 10
S12: Refrigeration stopped due to low Sair 12

8 Manual RS8AE802 © Danfoss 12-2009 EKC 361
Light-emitting diodes (LED) on front panel
There are LED’s on the front panel which will light up when the
corresponding relay is activated.
The three lowest LED’s will ash, if there is an error in the regula-
tion.
In this situation you can upload the error code on the display and
cancel the alarm by giving the uppermost button a brief push.
Display
The values will be shown with three digits, and with a setting you
can determine whether the temperature is to be shown in °C or in
°F.
Operation Menu survey
The controller can give the following messages:
E1
Error message
Errors in the controller
E7 Cut-out Sair
E8 Shortcircuited Sair
E11 Valve’s actuator temperature outside its range
E12 Analog input signal is outside the range
A1 Alarm message High-temperature alarm
A2 Low-temperature alarm
The buttons
When you want to change a setting, the two buttons will give you
a higher or lower value depending on the button you are push-
ing. But before you change the value, you must have access to the
menu. You obtain this by pushing the upper button for a couple
of seconds - you will then enter the column with parameter codes.
Find the parameter code you want to change and push the two
buttons simultaneously. When you have changed the value, save
the new value by once more pushing the two buttons simultane-
ously.
Gives access to the menu (or cutout an alarm)
Gives access to changes
Saves a change
Examples of operations
Set set-point
1. Push the two buttons simultaneously
2. Push one of the buttons and select the new value
3. Push both buttons again to conclude the setting
Set one of the other menus
1. Push the upper button until a parameter is shown
2. Push one of the buttons and nd the parameter you want to
change
3. Push both buttons simultaneously until the parameter value is
shown
4. Push one of the buttons and select the new value
5. Push both buttons again to conclude the setting Factory setting
If you need to return to the factory-set values, it can be done in this way:
- Cut out the supply voltage to the controller
- Keep both buttons depressed at the same time as you recon nect the supply voltage
Function Para-
meter Min. Max. Fac.
setting
Normal display
Shows the temperature at the selected sensor
At ICM valve OD also can be selected -°C
Reference
Set the required room temperature - -70°C 160°C 10°C
Temperature unit r05 °C °F °C
Input signal’s temperature inuence r06 -50°C 50°C 0.0
Correction of the signal from Sair r09 -10,0°C 10,0°C 0.0
Correction of the signal from Saux r10 -10,0°C 10,0°C 0.0
Start/stop of refrigeration r12 OFF/0 On/1 On/1
Alarm
Upper deviation (above the temperature setting) A01 0 50 K 5.0
Lower deviation (below the temperature setting) A02 0 50 K 5.0
Alarm’s time delay A03 0 180
min 30
Regulating parameters
Actuator max. temperature n01 41°C 140°C 140
Actuator min. temperature n02 40°C 139°C 40
Actuator type (1=CVQ-1 to 5 bar, 2=CVQ 0 to 6
bar, 3=CVQ 1.7 to 8 bar, 4= CVMQ, 5=KVQ, 6= ICM) n03 1 6 2
P: Amplication factor Kp n04 0,5 50 3
I: Integration time Tn (600 = o) n05 60 s 600 s 240
D: Dierentiation time Td (0 = o) n06 0 s 60 s 10
Transient phenomenon
0: Ordinary control
1: Underswing minimised
2: No underswing
n07 0 2 2
OD - Opening degree - max. limit - ICM only n32 0% 100% 100
OD - Opening degree min limit - ICM only n33 0% 100% 0
Miscellaneous
Controller's address (0-120) o03* 0 990 0
ON/OFF switch (service-pin message) o04* - -
Dene output signal of analog output:
0: no signal, 1: 4 - 20 mA, 2: 0 - 20 mA o09 0 2 0
Dene input signal of analog input
0: no signal, 1: 4 - 20 mA, 2: 0 - 20 mA o10 0 2 0
Language (0=english, 1=German, 2=French,
3=Danish, 4=Spanish and 6=Swedish.)When you
change the setting to an other language you must
activate o04 before "the new language" can be
visible from the AKM program.
011* 0 6 0
Set supply voltage frequency o12 50
Hz/0
60
Hz/1 0
Select of running display value o17 Au/0 Air/1 Air/1
(Setting for the function o09)
Set the temperature value where the output signal
must be minimum (0 or 4 mA)
o27 -70°C 160°C -35
(Setting for the function o09)
Set the temperature value where the output signal
must be maximum (20 mA)
o28 -70°C 160°C 15
Service
Read temperature at the Sair sensor u01 °C
Read regulation reference u02 °C
Read temperature at the Saux sensor u03 °C
Read valve's actuator temperature u04 °C
Read reference of the valve's actuator temperature u05 °C
Read value of external current signal u06 mA
Read value of transmitted current signal u08 mA
Read status of input DI u10 on/o
ICM opening degree. (only at ICM) u24 %
*) This setting will only be possible if a data communication module has been
installed in the controller.
SW =1.5x

EKC 361 Manual RS8AE802 © Danfoss 12-2009 9
Data
Ordering
Type Function Code No.
EKC 361 Evaporating pressure controller 084B7060
EKA 174
Data communication module
(accessories), (RS 485 module)
with galvanic separation
084B7124
Necessary connections
Terminals:
25-26 Supply voltage 24 V a.c.
17-18 Signal from actuator (from NTC)
23-24 Supply to actuator (to PTC)
20-21 Pt 1000 sensor at evaporator outlet
1-2 Switch function for start/stop of regulation. If a switch is
not connected, terminals 1 and 2 must be shortcircuited.
Application dependent connections
Terminal:
12-13 Alarm relay
There is connection between 12 and 13 in alarm situations
and when the controller is dead
8-10 Relay switch for start/stop of fan
9-10 Relay switch for start/stop of solenoid valves
18-19 Current signal from other regulation (Ext.Ref.)
21-22 Pt 1000 sensor for monitoring
2-5 Current output for Sair/Saux temperature or ICAD actuator
for ICM valve
3-4 Data communication
Mount only, if a data communication module has been
mounted.
It is important that the installation of the data communi-
cation cable be done correctly. Cf. separate literature No.
RC8AC..
Connections
Supply voltage
24 V a.c. +/-15% 50/60 Hz, 80 VA
(the supply voltage is galvanically separated
from the input and output signals)
Power consumption Controller
Actuator
5 VA
75 VA
Input signal Current signal 4-20 mA or 0-20 mA
Digital input from external contact function
Sensor input 2 pcs. Pt 1000 ohm
Output signal Current signal 4-20 mA or 0-20 mA
Max. load: 200 ohm
Relay output 2 pcs. SPST AC-1: 4 A (ohmic)
AC-15: 3 A (inductive)
Alarm relay 1 pcs. SPST
Actuator
Input Temperature signal from
sensor in the actuator
Output Pulsating 24 V a.c. to
actuator
Data communication Possible to connect a data communication
module
Ambient
temperature
During operation
During transport
-10 - 55°C
-40 - 70°C
Enclosure IP 20
Weight 300 g
Mounting DIN rail
Display LED, 3 digits
Terminals max. 2.5 mm2multicore
Approvals
EU Low Voltage Directive and EMC demands re
CE-marking complied with.
LVD-tested acc. to EN 60730-1 and EN 60730-
2-9
EMC-tested acc. to EN50081-1 and EN 50082-2
Temperature sensor Pt 1000 ohm:..........Kindly refer to catalogue RK0YG...
Valves: .............................................................DKRCI.PD.HT0.A
Data communication
Wire length: See appendix 2
CVQ/
CVMQ/
KVQ

10 Manual RS8AE802 © Danfoss 12-2009 EKC 361
Data communication
Examples
Example of menu display
If you want to know more about operation of controllers via PC,
you may order additional literature.
This page contains a description of a few of the possibilities you
will have when the controller is provided with data communi-
cation.
Each controller is provided
with a plug-in module.
The controllers are then con-
nected to a two-core cable.
The cable can be connected
to a gateway type AKA 245.
This gateway will now control
the communication to and
from the controllers.
It will collect temperature val-
ues and it will receive alarms.
When there is an alarm the
alarm relay will be activated for
two minutes
The gateway can now be con-
nected to a modem.
When an alarm occurs from
one of the controllers, the
gateway will - via the modem
- make a phone call to the
service company.
At the service company a
modem, gateway and PC with
system software type AKM
have been installed.
All the controllers’ functions
can now be operated from the
various menu displays.
The programme will for exam-
ple upload all the collected
tempera ture values once a day.
• Measurements are shown at
one side and settings at the
other.
• You will also be able to see
the parameter names of the
functions on page 5-7.
• With a simple change-over
the values can also be
shown in a trend diagram.
• If you wish to check earlier
temperature measurements,
you can see them in the log
collection.
Alarms
If the controller is extended
with data communication, it
will be possible to dene the
importance of the transmitted
alarms.
The importance is dened with
the setting: 1, 2, 3 or 0. When
the alarm then arises at some
time, it will result in one of the
following activities:
1 = Alarm
The alarm message is sent off
with alarm status 1. This means
that the gateway that is the
master in the system will have
its alarm relay output activated
for two minutes. Later, when
the alarm ceases, the alarm
text will be retransmitted, but
now with status value 0.
2 = Message
The alarm text is transmitted
with status value 2. Later, when
the “message” lapses, the alarm
text is retransmitted, but now
with status value 0.
3 = Alarm
As “1”, but the master gateway’s
relay output is not activated.
0 = Suppressed information
The alarm text is stopped at
the controller. It is transmitted
nowhere.

EKC 361 Manual RS8AE802 © Danfoss 12-2009 11
Appendix 1
Interaction between internal and external start/stop functions
and active functions.
Connection between the evaporating temperature and the
actuator’s temperature (the values are approximate).
n01: The highest regulated room temperature will have a belonging tovalue which
in turn indicates the value of the n01 setting. Due to tolerances in the actua-
tor, the setting value must be 10 K higher than shown in the curve.
n02: The lowest occurring suction pressure will have a belonging tovalue which in
turn indicates the value of the n02 setting. Due to tolerances in the actuator,
the setting value must be 10 K lower than shown in the curve.
CVQ KVQ
CVMQ
Appendix 2
Cable length for the CVQ actuator
The actuator must be supplied with 24 V a.c. ± 10%.
To avoid excessive voltage loss in the cable to the actuator, use a
thicker cable for large distances.
Wire cross section
Cable length
Internal Start/stop O O On On
External Start/stop O On O On
Refrigeration O On
Actuator Stand-by Regulating
Actuator temperature "n02" "n02" to "n01"
Fan relay O On
Expansion valve relay O On
Temperature monitoring No Yes
Sensor monitoring Yes Yes
Appendix 3

12 Manual RS8AE802 © Danfoss 12-2009 EKC 361
Start of controller
When the electric wires have been connected to the controller,
the following points have to be attended to before the regulation
starts:
1. Switch o the external ON/OFF switch that starts and stops the
regulation.
2. Follow the menu survey on page 7, and set the various para-
meters to the required values.
3. Switch on the external ON/OFF switch, and regulation will start.
If the temperature fluctuates
When the refrigerating system has been made to work steadily,
the controller’s factory-set control parameters should in most
cases provide a stable and relatively fast regulating system.
If the system on the other hand oscillates, you must register the
periods of oscillation and compare them with the set integration
time Tn, and then make a couple of adjustments in the indicated
parameters.
Symptom Defect Conrmation of defect
Media temperature too low.
Actuator feels cold.
Short-circuited NTC resistor in
actuator.
If less than 100 ohm is measured across terminals 17 and 18 (disassemble the lead),
the NTC or the leads are short-circuited. Check the leads.
Defective PTC resistor (heating
element) in actuator.
If more than 30 ohm or 0 ohm is measured across terminal 23 and 24 (disassemble
the lead), either the PTC or the leads are defective.
Check the leads.
Media temperature too low.
Actuator fells warm.
Undersized cable to CVQ. Measure voltage across terminanls 77 and 78 (min. 18 V a.c.).
Measure resistance in power cables to CVQ (max. 2 ohm)
Undersized 24 V transformer. Measue voltage across transformer output terminals (24 V a.c. +10/ -15%) under all
working conditions.
If voltage drops under some working conditions the transformer is undersized.
Loss of charge in actuator. Replace actuator.
Media temperature too high.
Actuator feels cold.
Fault in refrigerant plant. Examine platn for ther defects.
Media temperature too high.
Actuator feels warm.
Cut out NTC resistor in actuator. If more than 200 kohm is measured across terminals 17 and 18 (disassemble the
lead), either the NTC or leads are disconnected.
Check the leads.
Trouble shooting - ICS/PM with CVQ
In addition to the error messages transmitted by the controller,
the table below may help identifying errors and defects.
If the time of oscillation is longer than the integration time:
(Tp> Tn , (Tn is, say, 4 minutes))
1. Increase Tnto 1.2 times Tp
2. Wait until the system is in balance again
3. If there is still oscillation, reduce Kp by, say, 20%
4. Wait until the system is in balance
5. If it continues to oscillate, repeat 3 and 4
If the time of oscillation is shorter than the integration time:
(Tp< Tn , (Tn is, say, 4 minutes))
1. Reduce Kp by, say, 20% of the scale reading
2. Wait until the system is in balance
3. If it continues to oscillate, repeat 1 and 2
4. If the system has been tted with a thermostatic expansion
valve, it must be set to minimum stable superheating. (If a
specic T0 is required for the adjustment of the ex pansion valve,
the two setting values for the actuator temperature (n01 and
n02) can be set to the belonging value while the adjustment
of the expansion valve is carried out. Remember to reset the
values).
5. Follow the actual room temperature on the display. (On
terminals 2 and 5 a current signal can be transmitted which
represents the room temperature. Connect a data collection
unit, if applicable, so that the temperature performance can be
followed).

EKC 361 Manual RS8AE802 © Danfoss 12-2009 13
Method for fixing Kp, Tn and Td
Described below is a method (Ziegler-Nichols) for xing Kp, Tn
and Td.
1. The system is made to regulate the temperature at the required
reference with a typical load. It is important that the valve regu-
lates, and that it is not fully open.
2. Parameter u05 is read. The actuator’s min. and max. setting is
adjusted, so that the average of the min. and max. values is
equal to the read u05.
3. The controller is set, so that it will regulate as a P-controller. (Td is
set to 0, Tn in pos. OFF (600), and Q-Ctrl.mode is set at 0).
4. The stability of the system is examined by stopping the system
for, say, one minute (using the start/stop setting or the switch).
Now check how the building-up of the temperature proceeds.
If the building-up peters out, raise Kp a little and repeat the
start/stop operation. Continue with this until you obtain a build-
ing-up which does not peter out.
5. Kp is in this case the critical amplication (Kpcritical) and the build-
ing-up time for the continued oscillation is the critical building-
up time (Tcritical).
6. Based on these values, the regulating parameters can now be
calculated and subsequently set:
• If PID regulation is required:
Kp < 0.6x Kpcritical
Tn > 0.5x Tcritical
Td < 0.12x Tcritical
• If PI regulation is required:
Kp < 0.45x Kpcritical
Tn > 0.85x Tcritical
7. Reset the values for the controller’s min. and max. tem peratures
and Q-Ctrl.mode.
Adjustment of the actuator’s min. and max. temperatures
At the rst setting these values were set to 10 K outside of the
expected temperature in order to eliminate the tolerances in the
actuator. By adjusting the two values to the values where the
valve is exactly in mesh, the valve will all the time remain active in
its regulation.
If the actuator is replaced at a later date, this procedure must be
repeated for the new actuator.
Min.
By adjusting the actuator’s min. temperature you obtain a limit
for how low a pressure can occur in the evaporator (the point is
where the valve starts a limitation of the refrigerant ow).
The system must be put in an operating situation where max.
capacity is called for (large refrigeration need).
The min. temperature must now be changed upwards step by
step, at the same time as the evaporating pressure is read on the
system’s manometer.
When a change of the evaporating pressure is registered, this is
the point where the valve is exactly in mesh. (If frost protec tion is
required for the system, the value can be raised to the belonging
value).
Max.
By adjusting the actuator’s max. temperatur you obtain a limit for
how high a pressure can occur in the evaporator (the refrigerant
ow is blocked completely).
The system is put in an operating situation where there is no call
for refrigeration capacity (no refrigerant ow).
The max. temperature is now changed downwards step by step, at
the same time as the evaporating pressure is read on the system’s
manometer.
When a change of the evaporating pressure is registered, this
is the point where the valve opens. Adjust the setting a little
upwards, so that the valve will again close completely for the
refrigerant ow. (If the actual application has a requirement re-
garding max. evaporating pressure, a lower setting may of course
be selected, so that the pressure is limited).
Fine adjustments
When the system has been operating for a while, it may be
required for some systems to optimise some of the adjustments.
Below we have a look at settings having an inuence on the speed
and accuracy of the regulation.

14 Manual RS8AE802 © Danfoss 12-2009 EKC 361

EKC 361 Manual RS8AE802 © Danfoss 12-2009 15

16 Manual RS8AE802 © Danfoss 12-2009 EKC 361
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