Danfoss EKC 361 User guide

User Guide

Media temperature controller

EKC 361

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

Features • 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 under
swings are less pronounced

- Build-up without underswings

• PID regulation

• p0 limitation

© Danfoss | DCS (ADAP-KOOL®) |2015-11

DKRCI.PS.RP0.B2.02 | 1

User Guide | Media temperature controller, EKC 361

Introduction

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

ICS or PM

© Danfoss | DCS (ADAP-KOOL®) | 2015-11

Start/
stop

DKRCI.PS.RP0.B2.02 | 2

User Guide | Media temperature controller, EKC 361

Application examples

ICS/PM
ISC/PM with CVQ is a pilot-operated and pressure-dependent
valve 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 minimum temperature. (Param­eter n02)
Please see separate literature for ICS/PM
ICS : DKRCI.PD.HS0.A­PM : DKRCI.PD.HL0.A-

ICM
ICM is a direct activating and pressure independent valve for con­trolling 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 tem­perature. 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 separate literature for ICM
ICM : DKRCI.PD.HT0.A-

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 opera­tion. If Parameter (r12) is OFF, EKC 361 will operate corresponding
to if Digital Input is OFF
As media temperature sensor is S
can also be used to control liquid.

is used. Please observe that S

air

air

As option an auxiliary temperature sensor Saux can be installed
but only for monitoring.
S

can both be shown as running display value selected by

air/Saux

parameter o17. The selected sensor (S
out on the Analog Output as 0/4-20 mA.

air

or S

) will be sent

aux

Temperature scaling with parameter o27 and o28. Please observe
by ICM the Analog Output is not available for sending temperature
signals (S
It is normally recommended, on a aircooler, to install S
evaporator air outlet side.

air

or S

).

aux

, at the

air

Extra options

• PC operation
The controller can be provided with data communication, so
that it may be hooked up with other products in the ADAP­KOOL® 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.

© Danfoss | DCS (ADAP-KOOL®) | 2015-11

DKRCI.PS.RP0.B2.02 | 3

User Guide | Media temperature controller, 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 re­frigerated 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 be­tween 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 S
sensor must be placed at the air outlet from the evaporator to

. This room

air

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 (pres­sure) 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 eect 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 (p0 limitation)

The inner control loop mentioned above also causes the evapora­ting 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

The allowed temperature in the actuator determines the evapora ting pressure

Actuator temperature

Regulation with ICM

When using ICM as selected valve the system will still control ICM
in order to maintain S
This system does not include any inner control loop.

according to entered setpoint.

air

It is a direct operating and pressure independent valve for control­ling media temperature. (S

).

air

© Danfoss | DCS (ADAP-KOOL®) | 2015-11

DKRCI.PS.RP0.B2.02 | 4

User Guide | Media temperature controller, EKC 361

Survey of functions

Function Para-

meter

Normal display

Parameter by operation via data com­munication

Normally S
S

aux

(017=Air) will be shown as running display value. If lower button is activated

air

will be displayed for 5 sec, and then return to S

air

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) S
(u24) will be displayed for 5 sec, and then return to S
If (017=Au) OD (u24) will be shown as running display value. If lower button is activated S
be displayed for 5 sec, and then return to OD (u24)

(017=Air) will be shown as running display value. If lower button is activated OD

air

.

air

air

will

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).

Temperature unit

Here you select whether the controller is to indicate the temperature values in °C or in °F. If indi­cation in °F is selected, other temperature settings will also change over to Fahrenheit, either as
absolute values or as delta values.

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).

Correction of signal from S

(Compensation possibility through long sensor cable).

Correction of signal from S

(Compensation possibility through long sensor cable).

air

aux

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.

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 S
active when the S
+ r06) can be seen in u02).

temperature is set here. The value is set in Kelvin. The alarm becomes

air

temperature exceeds the actual reference plus A01. (The actual reference (SP

air

Alarm for lower deviation

The alarm for too low S
active when the S
ture alarm is detected (A2 alarm) the solenoid valve in the liquid line (Digital output on terminal

temperature is set here. The value is set in Kelvin. The alarm becomes

air

temperature drops below the actual reference minus A02. If a low tempera-

air

9 and 10) will be closed

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.

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.

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.

Air temp.

- SP Temp.

r05 Temp unit

°C=0,
°F=1
(In AKM only °C is displayed whatever the
setting)

r06 Ext. Ref.o set (°C/°F)

r09 Adjust S

r10 Adjust S

(°C/°F)

Air

(°C/°F)

Aux

r12 Main Switch

A01 Upper deviation

A02 Lower deviation

A03 Temp alarm delay

With data communication the importance
of the individual alarms can be dened.
Setting is carried out in the “Alarm destina­tions” menu. See also page 10.

n01 Q-max. temp.

n02 Q-min. temp.

© Danfoss | DCS (ADAP-KOOL®) | 2015-11

DKRCI.PS.RP0.B2.02 | 5