Danfoss EKC 202B Manual page 9

Alarm
The controller can give alarm in different situations. When there is an alarm all the light-emitting
diodes (LED) will flash 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 defined in o02.
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 DI alarm
A cut-out/cut-in input will result in alarm when the time delay is passed. The function is defined
in o02.
High alarm limit for condenser temperature
If the S5 sensor is used for monitoring the condenser's temperature you must set the value at
which the alarm is to become activated. The value is set in °C.
The definition of S5 as condenser sensor is accomplished in o70. The alarm is zeroset again 10 K
below the set temperature.
Compressor
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)
Min. OFF-time (in minutes)
Reversed relay function for compressor relay
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 pro-
duces the result that there will be refrigeration if the supply voltage to the controller fails).
External relay (only EKC 302)
Here it is possible to force the build in relays to connect in the voltage's zero crossing. The life-
time of the relays is increased, or the load can be increased.
The function should not be activated if contactors are connected to one or more of the control-
ler's relays. This will result in a reduction of the contactors lifetime.
0: The load is connected directly to the controller's relays (zero-crossing activated)
Relay contact and controller supply must use same phase.
1: The controller's relay must draw a external contactor (zero-crossing cancelled)
EKC 202 / 302 Manual RS8DZ702 © Danfoss 03-2012
Alarm settings
With data communication the importance
of the individual alarms can be defined.
Setting is carried out in the "Alarm destina-
tions" menu.
A03 Alarm delay
A04 DoorOpen del
A12 Pulldown del
A13 HighLim Air
A14 LowLim Air
A27 AI.Delay DI
A37 Condtemp Al.
Reset alarm
Compressor control
c01 Min. On time
c02 Min. Off time
c30 Cmp relay NC
c70 Ext. Relay
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