Troubleshooting
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Assembly PA 20
Error category
Display
Problem
Display remains dark
Display
Problem
Display remains dark
Possible cause
Incorrect polarity of the supply voltage
Solution
Measure current : PA -> 25 mA (45 mA with pilot light)
![Measure current : PA -> 25 mA (45 mA with pilot light)](/api/keller/getMedia?bu=its&id=ID9000001)
Incorrect polarity of the supply voltage
Solution
Measure current : PA -> 25 mA (45 mA with pilot light)
Possible cause
Flange plug damaged
Solution
Visual inspection for completeness of the connection pins in the connector
![Visual inspection for completeness of the connection pins in the connector](/api/keller/getMedia?bu=its&id=ID9000027)
Flange plug damaged
Solution
Visual inspection for completeness of the connection pins in the connector
Possible cause
Device internal temperature above the permissible ambient temperature
Solution
Use protective fitting / cooling fitting / shield radiant heat
![Use protective fitting / cooling fitting / shield radiant heat](/api/keller/getMedia?bu=its&id=ID9000018)
Device internal temperature above the permissible ambient temperature
Solution
Use protective fitting / cooling fitting / shield radiant heat
Possible cause
DC voltage 24 VDC missing or faulty
Solution
Check correct connection of the pyrometer to the plant
![Check correct connection of the pyrometer to the plant](/api/keller/getMedia?bu=its&id=ID9000011)
DC voltage 24 VDC missing or faulty
Solution
Check correct connection of the pyrometer to the plant
Possible cause
Supply voltage on the device unstable
Solution
Check power supply
![Check power supply](/api/keller/getMedia?bu=its&id=ID9000011)
![Check power supply](/api/keller/getMedia?bu=its&id=ID9000001)
Supply voltage on the device unstable
Solution
Check power supply