Danfoss EKC 202 User Manual
Controller for temperature control
- EKC 202
Manual
2 Manual RS8DZ602 © Danfoss 08-2010 EKC 202
Introduction
Application
• The controller is used for temperature control refrigeration
appliances and cold room in supermarkets
• Control of defrost, fans, alarm and light
• For front panel mounting
Principle
The controller contains a temperature control where the signal
can be received from one temperature sensor.
The sensor is placed in the cold air ow after the evaporator or in
the warm air ow just before the evaporator.
The controller controls the defrost with either natural defrost or
electric defrost. Renewed cutin after defrost can be accomplished
based on time or temperature.
A measurement of the defrost temperature can be obtained
directly through the use of a defrost sensor.
Two to four relays will cut the required functions in and out – the
application determines which:
• Refrigeration (compressor or solenoid valve)
• Defrost
• Fan
• Alarm
• Light
The dierent applications are described on next page.
Advantages
• Integrated refrigeration-technical functions
• Defrost on demand in 1:1 systems
• Buttons and seal imbedded in the front
• IP65 density from the front panel
• Digital input for either:
- Door contact function with alarm
- Defrost start
- Start/stop of regulation
- Night operation
- Change-over between two temperature reference
- Case cleaning function
• Instant programming via programming key
• HACCP
Factory calibration that will guarantee a better measuring accuracy than stated in the standard EN 441-13 without subsequent
calibration (Pt 1000 ohm sensor)
Extra module
• The controller can afterwards be tted with an insertion module
if the application requires it.
The controller has been prepared with plug, so the module
simply has to be pushed in
- Battery and buzzer 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.
- Data communication
If you require operation from a PC, a data communication module has to be placed in the controller.
- Coordinated defrost via data communication
Contents
Introduction ....................................................................................................... 2
Operation ............................................................................................................ 5
Menu survey .......................................................................................................6
Functions .............................................................................................................8
Connections .....................................................................................................14
Data .....................................................................................................................15
Ordering ............................................................................................................16
EKC 202 Manual RS8DZ602 © Danfoss 08-2010 3
EKC 202A
Controller with two relay outputs, two temperature sensors and
digital input.
Temperature control at start/stop of compressor / solenoid valve
Defrost sensor
Electrical defrost / gas defrost
EKC 202B
Controller with three relay outputs, two temperature sensors and
digital input.
Temperature control at start/stop of compressor / solenoid valve
Defrost sensor
Electrical defrost / gas defrost
Relay output 3 is used for control of fan.
EKC 202C
Controller with four relay outputs, two temperature sensors and
digital input.
Temperature control at start/stop of compressor / solenoid valve
Defrost sensor
Electrical defrost / gas defrost
Control of fan
Relay output 4 can be used for an alarm function or for a light
function.
Alarm function
If an alarm function is required, relay number two may be used for
it.
Defrost is performed here with circulation of the air as the fans are
operating continuously.
4 Manual RS8DZ602 © Danfoss 08-2010 EKC 202
Start of defrost
A defrost can be started in dierent ways
Interval: Defrost is started at xed time intervals, say, 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
Contact Defrost is started here with a pulse signal on a
digital input.
Manual: An extra defrost can be activated from the control ler’s lower-most button
S5-temp. In 1:1 systems the eciency of the evaporator can
be followed. Icing-up will start a defrost.
Schedule Defrost here can be started at xed times of the
day and night. But max. six defrosts
Network A defrost can be started via data communication
All the mentioned methods can be used at random – if just one
them is activated a defrost will be started. When the defrost starts
the defrost timers are set at zero
Digital input
The digital input can be used for the following functions:
- Door contact function with alarm if the door has been open for
too long.
- Defrost start
- Start/stop of regulation
- Change-over to night operation
- Case cleaning
- Change to another temperature reference
- Inject on/o
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 next push restarts refrigeration
The dierent situations can be followed on the display.
There is no temperature monitoring during case cleaning.
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.
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 be used in 1:1 systems
A pulse signal
starts the
defrost
- + + °C
1 ÷ + Fan
2 ÷ ÷ O
3 + + °C
EKC 202 Manual RS8DZ602 © Danfoss 08-2010 5
Light-emitting diodes (LED) on front panel
There are LED’s on the front panel which will light up when the
belonging relay is activated.
= Refrigeration
= Defrost
= Fan
The light-emitting diodes will ash when there is an alarm.
In this situation you can download the error code to the display
and cancel/sign for the alarm by giving the top button a brief
push.
Defrost
During defrost a –d– is shown in the display. This view will
continue up till 15 min. after the cooling has resumed.
However the view of –d– will be discontinued if:
- The temperature is suitable within the 15 minutes
- The regulation is stopped with “Main Switch”
- A high temperature alarm appears
The buttons
When you want to change a setting, the upper and the lower
buttons will give you a higher or lower value depending on the
button you are pushing. 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 middle buttons until value for the parameter
is shown. When you have changed the value save the new value
by once more pushing the middle button
Display
The values will be shown with three digits, and with a setting you
can determine whether the temperature are to be shown in °C or
in °F.
Operation
Examples
Set menu
1. Push the upper button until a parameter r01 is shown
2. Push the upper or the lower button and nd that parameter you
want to change
3. Push the middle button until the parameter value is shown
4. Push the upper or the lower button and select the new value
5. Push the middle button again to enter the value.
Cutout alarm relay / receipt alarm/see alarm code
• Push briey the upper button
If there are several alarm codes they are found in a rolling stack.
Push the uppermost or lowermost button to scan the rolling
stack.
Set temperature
1. Push the middle button until the temperature value is shown
2. Push the upper or the lower button and select the new value
3. Push the middle button to select the setting
Manuel start or stop of a defrost
• Push the lower button for four seconds.
See the temperature at the defrost sensor
• Push briey the lower button
If no sensor has been mounted, ”non” will appear.
100% tight
The buttons and the seal are imbedded in the front.
A special moulding technique unites the hard front plastic, the
softer buttons and the seal, so that they become an integral
part of the front panel. There are no openings that can receive
moisture or dirt.
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