Version Nr. 1-9 - 14.03.2022
Doc. No. 99871510201USL
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Alarm Relay Operation
Both normally closed (NC) and normally open (NO) alarm contacts are provided. These refer to the alarm state.
Under normal conditions, the NC contact is closed and the NO contact is open. When an alarm condition is
present or the door contact is open, the NC contact will open and the NO contact will close. System power
failure will give an alarm condition.
State
Alarm relay Display
1 System powered OFF
2 System powered ON
- NO ALARM
- Door Contact Closed
3 System powered ON
- Door Contact Open
4 System powered ON
- ALARM STATE
Failure table:
The display shows either ‘’OFF’’ or “EXX” with an icon flashing (triangle), alternating with the standard display. If
more than one error occurs, these are shown in sequence on the display.
Failure
Code
Description
Solution
OFF
Door open
Close the enclosure door and check the door contact switch. If no
door contact switch is used and c68=0, bridge terminals on power
connector.
Incorrect phase sequence
(3-phase units)
Displayed on power-up. Check phase sequence.
E01
Failure internal
temperature sensor
Check probe connections
E02
Failure ambient
temperature sensor
Check probe connections
E04
High temperature alarm
The measured temperature has exceeded the threshold P26.
Check rating of the cooling unit. Clean air filters, condenser; check
fans’ and compressor’s correct operation. Contact your service
partner.
E05
Low temperature alarm The measured temperature has fallen below the threshold P25.
