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If the measured temperature is higher than the one displayed, set the
positive difference as the programming value (e.g. 2K).
The temperature display is then corrected by the set value.
8 Maintenance
The controller does not require any maintenance. It does not have any
fuses so, if brief voltage spikes occur, the refrigeration system will not
stop operating for a prolonged period. Once the disturbance has pas-
sed, the controller will automatically start up again.
Cleaning the housing: Only a dry anti-static cloth may be used to wipe
clean all plastic parts. Do not use water or cleaning agents containing
solvents.
9 Appendix
9.1 Alarm messages
If an alarm occurs, the alarm output will be activated and on the dis-
play a code will alternate with the cold store temperature.
Display
Meaning
AL1
Data lost from program memory.
The preset values will be used as an
emergency program.
The setpoint will be set to +4 °C.
AL2
Limit value (= specified value + E04) at sensor T1
exceeded and delay time E05 elapsed.
AL3
The sensor temperature is over 50 °C
or below –55°C.
AL4
The specified setpoint value is outside
the limits E01 and E02
AL5
Temperature sensor T1 – short circuit of break in wiring.
Compressor operates as a function of parameter E11
Clearing the alarm:
Press the
key.
All alarm messages, with the exception of AL2, are also reset by
switching off the operating voltage. AL2 can only be reset using
the
key.
12
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