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Controller for temperature control

— EKC 202D

Manual

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Introduction

Application

• The controller is used for temperature control refrigeration
appliances in supermarkets.

• With many predened applications one unit will oer you
several options. Flexibility has been planned both for new
installations and for service in the refrigeration trade.

Principle

The controller contains a temperature control where the signal
can be received from one or two temperature sensors.
The thermostat sensors are either placed in the cold air ow after
the evaporator, in the warm air ow just before the evaporator,
or both. A setting will determine how great an inuence the two
signals are to have on the control.
A measurement of the defrost temperature can be obtained
directly through the use of an S5 sensor or indirectly through
the use of the S4 measurement. Four relays will cut the required
functions in and out – the application determines which.
The options are the following:

• Refrigeration (compressor or relay)

• Fan

• Defrost

• Rail heat

• Alarm

• Light

The dierent applications are described on page 6.

Advantages

• Several applications in the same unit

• The controller has integrated refrigeration-technical functions,
so that it can replace a whole collection of thermostats and
timers

• Buttons and seal imbedded in the front

• Easy to remount data communication

• Two temperature references

• Digital inputs for various functions

• Clock function with super cap backup

Contents

Introduction …………………………………………………………………………………………. 2

Operation ……………………………………………………………………………………………… 3

Applications …………………………………………………………………………………………. 6

Survey of functions ……………………………………………………………………………… 7

Operation …………………………………………………………………………………………….16

Menu survey ………………………………………………………………………………………..17

Override ………………………………………………………………………………………………. 19

Ordering ………………………………………………………………………………………………19

Connections ………………………………………………………………………………………..20

Data ………………………………………………………………………………………………………21

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Operation

Sensors

Up to two thermostat sensors can be connected to the controller.
The relevant application determines how.

A sensor in the air before the evaporator:

This connection is primarily used when control is based on area.

A sensor in the air after the evaporator:

This connection is primarily used when refrigeration is controlled
and there is a risk of a too low temperature near the products.

A sensor before and after the evaporator:

This connection oers you the possibility of adapting the
thermostat, the alarm thermostat and the display to the relevant
application. The signal to the thermostat, the alarm thermostat
and the display is set as a weighted value between the two
temperatures, and 50% will for example give the same value from
both sensors.
The signal to the thermostat, the alarm thermostat and the display
can be set independently of one another.

Defrost sensor
The best signal concerning the evaporator’s temperature
is obtained from a defrost sensor mounted directly on the
evaporator. Here the signal may be used by the defrost function,
so that the shortest and most energy-saving defrost can take
place.

If a defrost sensor is not required, defrost can be stopped based
on time, or S4 can be selected.

Change of temperature reference

In an impulse appliance, for example, used for various product
groups. Here the temperature reference is changed easily with
a contact signal on a digital input. The signal raises the normal
thermostat value by a predened amount. At the same time the
alarm limits with the same value are displaced accordingly.

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Digital inputs

There are two digital inputs both of which can be used for one of
the following functions:

— Case cleaning

— Door contact function with alarm

— Starting a defrost

— Coordinated defrost

— Change-over between two temperature references

— Retransmission of a contact’s position via data communication

Case cleaning function

This function makes it easy to steer the refrigeration appliance
through a cleaning phase. Via three pushes on a switch you
change from one phase to the next phase.
The rst push stops the refrigeration – the fans keep working
”Later”: The next push stops the fans
”Still later”: The nal push restarts refrigeration
The dierent situations can be monitored on the display.

On the network a cleaning alarm is transmitted to the system unit.
This alarm can be ”logged” so that proof of the sequence of events
is provided.

— + + °C

1 ÷ + Fan

2 ÷ ÷ O

3 + + °C

Door contact function

In cold rooms and frost rooms the door switch can turn the light
on and o, start and stop the refrigeration and give alarm if the
door has remained open for too long.

Defrost

Depending on the application you may choose between the
following defrost methods:
Natural: Here the fans are kept operating during the defrost
Electric: The heating element is activated
Brine: The valve is kept open so that the brine can ow
through the evaporator

Start of defrost

A defrost can be started in dierent ways;
Interval: Defrost is started at xed time intervals, e.g., every
eight hour
Refrigeration time:
Defrost is started at xed refrigeration time inter-
vals, in other words, a low need for
refrigeration will ”postpone” the coming defrost
Schedule: Here defrost can be started at xed times during
the day and night. However, max. 6 times
Contact: Defrost is started with a contact signal on a digital
input
Network: The signal for defrost is received from a system unit
via the data communication
S5 temp In 1:1 systems the eciency of the evaporator can

be monitored. Icing-up will start a defrost.
Manual: An extra defrost can be activated from the control­ ler’s lower-most button

All the mentioned methods can be used at random – if just one of
them is activated a defrost will be started.

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Coordinated defrost

There are two ways in which coordinated defrost can be arranged.
Either with wire connections between the controllers or via data
communication.

Wire connections

One of the controllers is dened to be the controlling unit and
a battery module may be tted in it so that the clock is ensured
backup. When a defrost is started all the other controllers will
follow suit and likewise start a defrost. After the defrost the indi­vidual controllers will move into waiting position. When all are in
waiting position there will be a change-over to refrigeration.
(If just one in the group demands defrost, the others will follow
suit).

Defrost via data communication

All controllers are tted with a data communication module,
and via the override function from a gateway the defrost can be
coordinated.

Defrost on demand

1 Based on refrigeration time

When the aggregate refrigeration time has passed a xed time,
a defrost will be started.

2 Based on temperature

The controller will constantly follow the temperature at S5.
Between two defrosts the S5 temperature will become lower
the more the evaporator ices up (the compressor operates for a
longer time and pulls the S5 temperature further down). When
the temperature passes a set allowed variation the defrost will
be started.
This function can only work in 1:1 systems

Extra module

• The controller can afterwards be tted with an insertion module
if the application requires it.
The controller has been prepared with a plug, so the module
simply has to be pushed in

— Battery module

The module guarantees voltage to the controller if the supply
voltage should drop out for more than four hours. The clock
function can thus be protected during a power failure.

— Battery and buzzer module

As above + sound buzzer

— Data communication

If you require operation from a PC, a data communication mod­ule has to be placed in the controller.

• External display

If it is necessary to indicate the temperature on the front of
refrigeration appliance, a display can be mounted. The extra dis­play will show the same information as the controller’s display,
but does not incorporate buttons for operation.

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Applications

Here is a survey of the controller’s eld of application.

A setting will dene the relay outputs so that the controller’s inter­face will be targeted the chosen application.

On page 17 you can see the relevant settings for the respective
wiring diagrams.

S3 and S4 are temperature sensors. The application will deter­mine whether either one or the other or both sensors are to be
used. S3 is placed in the air ow before the evaporator. S4 after
the evaporator.
A percentage setting will determine according to what the
control is to be based. S5 is a defrost sensor and is placed on the
evaporator.
DI1 and DI2 are contact functions that can be used for one of the
following functions: door function, alarm function, defrost start,
external main switch, night operation, change of thermostat ref­erence, appliance cleaning, forced refrigeration or coordinated
defrost. See the functions in settings o02 and o37.

Refrigeration control with one compressor

The functions are adapted to small refrigeration systems which
may be either refrigeration appliances or coldrooms.
The three relays can control the refrigeration, the defrost and the
fans, and the fourth relay can be used for either alarm function,
light control or rail heat control.

• The alarm function can be linked up with a contact function
from a door switch. If the door remains open longer than al­lowed an alarm is triggered.

• The light control can also be linked up with a contact function
from a door switch. An open door will switch on the light and
it will remain lit for two minutes after the door has been closed
again.

• The rail heat function can be used in refrigeration or freezing
appliances or on the door’s heating element for frostrooms.

The fans can be stopped during defrost and they may also follow
a door switch’s open/close situation.

There are several other functions for the alarm function as well
as the light control, rail heat control and fans. Please refer to the
respective settings.

1

2

3

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Survey of functions

Function Para-

meter

Normal display

Normally the temperature value from one of the two thermostat sensors S3 or S4 or a
mixture of the two measurements is displayed.
In o17 the ratio is determined.

Thermostat Thermostat control
Set point

Regulation is based on the set value plus a displacement, if applicable. The value is set
via a push on the centre button.
The set value can be locked or limited to a range with the settings in r02 and r 03.
The reference at any time can be seen in ”u28 Temp. ref”

Differential

When the temperaure is higher than the reference + the set dierential, the compres­sor relay will be cut in. It will cut out again when the temperature comes down to the
set reference.

Ref. Dif.

Setpoint limitation

The controller’s setting range for the setpoint may be narrowed down, so that much
too high or much too low values are not set accidentally — with resulting damages.

To avoid a too high setting of the setpoint, the max. allowable reference value must
be lowered.

To avoid a too low setting of the setpoint, the min. allowable reference value must be
increased.

Correction of the display’s temperature showing

If the temperature at the products and the temperature received by the controller are
not identical, an oset adjustment of the shown display temperature can be carried
out.

Temperature unit

Set here if the controller is to show temperature values in °C or in °F.

Correction of signal from S4

Compensation possibility through long sensor cable

Correction of signal from S3

Compensation possibility through long sensor cable

Start / stop of refrigeration

With this setting refrigeration can be started, stopped or a manual override of the
outputs can be allowed.
Start / stop of refrigeration can also be accomplished with the external switch func­tion connected to a DI input.
Stopped refrigeration will give a ”Standby alarm”.

Night setback value

The thermostat’s reference will be the setpoint plus this value when the controller
changes over to night operation. (Select a negative value if there is to be cold ac­cumulation.)

Selection of thermostat sensor

Here you dene the sensor the thermostat is to use for its control function. S3, S4, or a
combination of them. With the setting 0%, only S3 is used (Sin). With 100%, only S4.

Parameter by operation via data
communication

Display air (u56)

Cutout °C

r01 Dierential

r02 Max cutout °C

r03 Min cutout °C

r04 Disp. Adj. K

r05 Temp. unit

°C=0. / °F=1
(Only °C on AKM, whatever the set­ting)

r09 Adjust S4

r10 Adjust S3

r12 Main Switch

1: Start
0: Stop

-1: Manual control of outputs allowed

r13 Night oset

r15 Ther. S4 %

Activation of reference displacement

When the function is changed to ON the thermostat dierential will be increased by
the value in r40. Activation can also take place via input DI1 or DI2 (dened in o02 or
o37).

r39 Th. oset

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Value of reference displacement

The thermostat reference and the alarm values are shifted the following number of
degrees when the displacement is activated. Activation can take place via r39 or input

DI

Alarm Alarm settings

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 delay (short 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.

Time delay for door alarm

The time delay is set in minutes.
The function is dened in o02 or in o37.

Time delay for cooling (long alarm delay)
This time delay is used during start-up, during defrost, immediately after a defrost.
There will be change-over to the normal time delay (A03) when the temperature has
dropped below the set upper alarm limit.
The time delay is set in minutes.

Upper alarm limit

Here you set when the alarm for high temperature is to start. The limit value is set in
°C (absolute value). The limit value will be raised during night operation. The value is
the same as the one set for night setback, but will only be raised if the value is posi­tive.
The limit value will also be raised in connection with reference displacement r39.

Lower alarm limit

Here you set when the alarm for low temperature is to start. The limit value is set in °C
(absolute value).
The limit value will also be raised in connection with reference displacement r39.

Delay of a DI1 alarm

A cut-out/cut-in input will result in alarm when the time delay has been passed. The
function is dened in o02.

Delay of a DI2 alarm

A cut-out/cut-in input will result in alarm when the time delay has been passed. The
function is dened in o37

Signal to the alarm thermostat

Here you have to dene the ratio between the sensors which the alarm thermostat
has to use. S3, S4 or a combination of the two.
With setting 0% only S3 is used. With 100% only S4 is used

Compressor Compressor control

The compressor relay works in conjunction with the thermostat. When the thermo­stat calls for refrigeration will the compressor relay be operated.

Running times

To prevent irregular operation, values can be set for the time the compressor is to run
once it has been started. And for how long it at least has to be stopped.

The running times are not observed when defrosts start.

Min. ON-time (in minutes) c01 Min. On time
Min. OFF-time (in minutes) c02 Min. O time

Reversed relay function for D01

0: Normal function where the relay cuts in when refrigeration is demanded
1: Reversed function where the relay cuts out when refrigeration is demanded (this
wiring produces the result that there will be refrigeration if the supply voltage to the
controller fails).

The LED on the controller’s front will show whether refrigeration is in progress. Comp Relay

r40 Th. oset K

Night setbck
(start of night signal)

Forced cool.
(start of forced cooling)

With data communication the impor­tance of the individual alarms can be
dened. Setting is carried out in the
“Alarm destinations” menu.

A03 Alarm delay

A04 DoorOpen del

A12 Pulldown del

A13 HighLim Air

A14 LowLim Air

A27 AI.Delay DI1

A28 AI.Delay DI2

A36 Alarm S4%

Reset alarm
EKC error

c30 Cmp relay NC

Here you can read the status of the
compressor relay, or you can force­control the relay in the ”Manual
control” mode