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
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 |
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
