Danfoss EKC 202C-MS User guide
User Guide
Controller for temperature control
EKC 202C-MS
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
• Signal from NTC sensors
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.
Four relays will cut the required functions in and out – the application determines which:
• Refrigeration (compressor or solenoid valve)
• Defrost
• Fan
• Alarm or light
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
• Sensor signal from NTC sensor (adjustable)
• HACCP
Calibration option so that the EN 441-13 standard can be fullled.
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 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
2 User Guide RS8GH202 © Danfoss 2015-08 EKC 202C-MS
Functions ............................................................................................................. 8
Connections ..................................................................................................... 14
Data ..................................................................................................................... 15
Ordering ............................................................................................................16
Outputs and Inputs
Controller with four relay outputs, two temperature sensors and
digital input.
• Temperature control at start/stop of compressor / solenoid valve
• Defrost sensor must be connected when defrosting stop is
performed by temperature
• If defrosting stop is performed on time, the sensor can be used
either for monitoring the condenser temperature or as a product
sensor
• Electrical defrost / gas defrost
• Control of fan
• Relay output 4 can be used for an alarm function or for a light
function.
Sensors
One or two NTC sensors of the same type must be connected.
The following can be selected:
NTC 5000 Ω @ 25°C. M2020 (Danfoss Type = EKS 211)
NTC 10000 Ω @ 25°C. Beta 3435 (Danfoss Type = EKS 221)
NTC 3000 Ω @ 25°C
NTC 2500 Ω @ 0°C
NTC 10000 Ω @ 25°C
NTC 2000 Ω @ 25°C
Set the type in menu o06.
Type NTC 5000 Ω
@ 25°C (M2020)
Danfoss NTC EKS 211 EKS 221 - - - -
°C Ω Ω Ω Ω Ω Ω
30 4029 8313 2417 - 8300 1651
25 5000 10000 3000 883 10000 2000
20 6246 12091 3747 1074 12271 2437
15 7855 14695 4712 1313 15146 2987
10 9951 17958 5970 1616 18809 3682
5 12696 22068 7617 2000 23504 4571
0 16330 27278 9798 2492 29564 5716
−5 21166 33922 12700 3124 37441 7198
−10 27681 42450 16608 3947 47754 9133
−15 36503 53468 21902 5019 61357 11644
−20 48614 67801 29168 6434 79440 14961
−25 65333 86580 39200 8306 103676 19402
−30 88766 111364 53259 10822 136428 25388
−35 121795 144324 73077 14217 181078 33505
−40 169157 188500 101490 18848 242495 44657
Alternativer
Alternatives
Alternativen
Alternatives
Alternativas
o06 n01 n02 n03 n04 n05 n06
NTC 10000 Ω
@ 25°C (Beta 3435)
Carel:
HP/WF/WP/INF
Dixell:
NS/NG/NX/NY/NT
Eliwell:
SN8
Lae:
SN4K..P
NTC 3000 Ω
Frigo:
M841
@ 25°C
NTC 2500 Ω
Wurm:
TRK 277
@ 0°C
NTC 10000 Ω
@ 25°C
Wurm:
T2000
Lae:
SN2K..P
NTC 2000 Ω
@ 25°C
EKC 202C-MS User Guide RS8GH202 © Danfoss 2015-08 3
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
A pulse signal
starts the
defrost
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
- + + °C
1 ÷ + Fan
2 ÷ ÷ O
3 + + °C
4 User Guide RS8GH202 © Danfoss 2015-08 EKC 202C-MS
Operation
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.
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
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
Manual 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.
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
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.
EKC 202C-MS User Guide RS8GH202 © Danfoss 2015-08 5
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