SCE 872500201USL Manual page 14

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
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
Description
Code
Door open
OFF
Incorrect phase sequence
(3-phase units)
Failure internal
E01
temperature sensor
Failure ambient
E02
temperature sensor
E04 High temperature alarm
E05 Low temperature alarm
Version Nr. 1-12 - 28.02.2022
Alarm relay Display
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.
Displayed on power-up. Check phase sequence.
Check probe connections
Check probe connections
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.
The measured temperature has fallen below the threshold P25.
Doc. No. 99872500201USL
Solution
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