Danfoss EKC 368 User guide

Data sheet

Electronic media temperature controller
Type EKC 368

The EKC 368 controller and KVS electric
suction modulating valve are used where
there are high requirements to refrigeration
of unpacked food products, e.g.:

• Delicatessen appliances

• Cold rooms for meat products

• Cold rooms for fruits and vegetables

• Containers

• Air conditioning plant

Features y The temperature is kept within an accuracy of

±0.5°C or better after a transient
phenomenon.

y A transient phenomenon can be controlled

with the adaptive function so that
temperature variations is kept on a minimum.

y Defrost sensor, so that the defrost time will be

as short as pos sible.

y PID regulation.

DKRCC.PS.RP0.B1.02 / 520H9697

Manual Electronic media temperature controller, type EKC 368

Introduction

Application

Controller and valve are used where there are high requirements
to refrigeration of unpacked food products, e.g.:

y Delicatessen appliances

y Cold rooms for meat products

y Cold rooms for fruits and vegetables

y Containers

y Air conditioning plant

System

A KVS valve is used. The capacity determines the size of it.
A solenoid valve is mounted in the liquid line which is to close
when the controller stops refrigeration.
Sensor S
evaporator.

Advantages

y Wastage is reduced because the air humidity around the pro-

y The temperature is kept within an accuracy of ±0.5°C or better

y A transient phenomenon can be controlled with the adaptive

y Defrost sensor, so that the defrost time will be as short as

y PID regulation

must be placed in the cold air current after the

air

ducts is kept as high as possible

after a transient phenomenon

function so that temperature variations is kept on a minimum

possible

Functions

y Modulating temperature control

y Defrost function: electricity, hotgas or natural

y Alarm if the set alarm limits are exceeded

y Relay outputs for defrost function, solenoid valve, fan and

alarmgiver

y Input signal that can displace the temperature reference

Extra options

y 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, monitoring and data collection can then be
performed from a PC - either in situ or at a service company.

LED's on front panel

KVS - signal

Refrigeration

Fan

Defrost

2 DKRCC.PS.RP0.B1.02 / 520H9697 © Danfoss A/S (DCS-IMCGPD/sw), 2015-02

Manual Electronic media temperature controller, type EKC 368

Function

Very accurate temperature control

With this system where controller and valve have been adapted
for optimum use in the refrigerating plant, the refrigerated
products may be stored with temperature uctuations of less than
±0.5°C.

High air humidity

As the evaporating temperature is constantly adapted to the
refrigeration needs and will always be as high as possible with
very small temperature uctuations, the relative air humidity in
the room will be kept at a maximum.
Drying-out of products will therefore be reduced to a minimum.

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.

y Fastest possible cooling

y Cooling with less underswing

y Cooling where underswing is unwanted

Valve

The valve is an evaporating pressure valve and is available in
several capacity sizes.
The valve is mounted on a step engine which receives impulses
from the controller.
The controller is adapted to this valve.
There is therefore only very few settings for the valve.

In case of power failure that valve's opening degree will be
maintained. If the application requires the valve open in this
situation a battery can be connected to the controller.

© Danfoss A/S (DCS-IMCGPD/sw), 2015-02 DKRCC.PS.RP0.B1.02 / 520H9697 3

Manual Electronic media temperature controller, type EKC 368

Data

Supply voltage

Power consumption

Input signal
*) Ri = 100 KΩ

Sensor input 2 pcs. Pt1000 ohm

Relay output 3 pcs. SPST

Alarm relay 1 pcs. SPST

Step motor output Pulsating 100 mA

Data communication Possible to connect a data communication module

Ambient
temperature

Enclosure IP 20

Weight 300 g

Mounting DIN rail

Display LED, 3-digits

Terminals max. 2.5 mm2 multicore

Approvals

If battery backup is used:
Requirements to battery: 18 V DC min. 100 mAh

24 V AC +/-15% 50/60 Hz, 10 VA
(the supply voltage is galvanically separated from the
input and output signals)

Controller
KVS-step motor

Voltage signal* 0 – 10 V or 2 – 10 V

Digital input from external contact function

Short-circuit (pulse signal) of 18 – 20 will start a defrost

During operation
During transport

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

5 VA

1.3 VA

AC-1: 4 A (ohmic)
AC-15: 3 A (inductive)

-10 – 55°C

-40 – 70°C

Ordering

Typ e Function Code No.

EKC 368 Evaporating pressure controller 084B7079

EKA 172 Realtime clock 084B7069

EKA 174 Data communication module (accessories),

(RS 485 module) with galvanic separation

AKA 211 Filter : 4 x 10 mH 084B2238

Temperature sensor Pt1000 ohm: Kindly refer to catalogue RK0YG...
Valves: Kindly refer to catalogue RK0YG...

084B7124

Connections

Necessary connections

Terminals:
25 – 26 Supply voltage 24 V AC
18 – 19 Pt1000 sensor at evaporator outlet
21 – 24 Supply to step motor
1 – 2 Switch function for start/stop of regulation. If a switch is

not connected, terminals 1 and 2 must be short circuited

5 – 6 Battery (the voltage will open the KVS valve if the

controller loses its supply voltage)

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 – 9 Relay switch for start/stop of defrost
8 – 10 Relay switch for start/stop of fan
8 – 11 Relay switch for start/stop of cooling
16 – 17 Voltage signal from other regulation (Ext.Ref.)
If the voltage signal is received from a PLC or the like,
a data communication module, if any, must be with
galvanic separation.
18-20 Pt1000 sensor for defrost function.
Short-circuit of the terminals for two seconds
(pulse signal) will start a defrost
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...

Data communication

21 22 23 24

white black green red

L > 5 m, see page 12

4 DKRCC.PS.RP0.B1.02 / 520H9697 © Danfoss A/S (DCS-IMCGPD/sw), 2015-02