Low alarm limit
Here you set the alarm limit for low temperature alarms. The limit value is set in °C (absolute value). During night condition,
the limit will remain unchanged, while a reference displacement r39, will increase or lower the limit with the value given by
r40.
Delay of a DI1 alarm
If “DI1” is congured as a door open alarm or as an external alarm, this time delay is used before raising the alarm. The
function is dened in o02
Delay of a DI2 alarm
If “DI2” is congured as a door open alarm or as an external alarm, this time delay is used before raising the alarm. The
function is dened in o37.
Condenser high alarm limit
If the condenser temperature reaches above this limit, condenser alarm is raised immediately and no action is taken. The
alarm is zeroset if temperature falls 5 K below the set temperature
Condenser high block limit
If the condenser temperature continues to increase above the “A37” limit and reaches this temperature limit, condenser
block alarm is raised and compressor is stopped. It is restricted to starting again until alarm is reset manually. Manual reset
of condenser block alarm can be performed in two ways:
• Power controller OFF and power ON controller again.
• Switch controller OFF and ON again via main switch or front button.
Voltage protection enable
This parameter is used to enable and disable the voltage protection feature, which protects compressor from adverse line
voltage conditions.
Minimum cut-in voltage
When the compressor is due to start, the voltage of the power supply will be checked and the compressor will only be
allowed to start if it is at least the value given in this parameter.
Minimum cut-out voltage
When the compressor is running, it will be switched OFF if the voltage goes below that given in this parameter.
Maximum voltage
When the compressor is running, it will be switched OFF if the voltage exceeds that given in this parameter. If the compres-
sor is already stopped, it will remain switched OFF.
Sum Alarm
Indication of the overall alarm status of the controller. Only used on Modbus datacommunication.
Defrost
Table 15: Defrost
The controller contains a timer function that is zeroset after each defrost start. The timer function will start a defrost if/
when the interval time is passed. The timer function starts after voltage is connected to the controller, but it is displaced
the rst time by the setting in d05.
If there is power failure, the timer value will be saved and continue from here when the power returns.
This timer function can be used as a simple way of starting defrosts, but it will always act as safety defrost if one of the
subsequent defrost starts is not received.
Defrost start can also be accomplished via data communication, via contact signals or manual start-up.
All starting methods will function in the controller. The dierent functions have to be set, so that defrosts do not ”come
tumbling” one after the other.
Defrost can be accomplished with natural air cycling, electricity or hot gas.
The actual defrost will be stopped based on time or temperature with a signal from a temperature sensor.
Defrost method
Here you set whether defrost is to be accomplished with electricity, gas or "non". During defrost the defrost relay will be cut
in.
• (0) no = none
• (1) nAt = natural
• (2) EL = electrical
• (3) gAS = gas
Defrost stop temperature
The defrost is stopped at a given temperature which is measured with a sensor (the sensor is dened in d10). The tempera-
ture value is set.
Interval between defrost starts
The function is zeroset and will start the timer function at each defrost start. When the time has expired the function will
start a defrost. The function is used as a simple defrost start, or it may be used as a safeguard if the normal signal fails to
appear. If a defrost start via data communication does not take place, the interval time will be used as max. time between
defrosts.
When there is defrost with clock function or data communication, the interval time must be set for a somewhat longer
period of time than the planned one, as the interval time will otherwise start a defrost which a little later will be followed
by the planned one. In connection with power failure the interval time will be maintained, and when the power returns,
the interval time will continue from the maintained value.
The interval time is not active when set to 0.
Max. defrost duration
This setting is a safety time so that the defrost will be stopped if there has not already been a stop based on temperature or
via coordinated defrost.
© Danfoss | Climate Solutions | 2023.05 BC432222569027en-000201 | 25
Case controller, type EKC 223 and EKC 224
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