Weidmuller UR20-4DI-4DO-PN-FSOE Manual page 92

8 LED displays and troubleshooting | Safe power-feed modules
UR20-PF-O-2DI-SIL, UR20-PF-O-2DI-DELAY-SIL
LED Status
Status LED Red:
– Module has not been snapped properly
– Error in the supply voltage
– Channel error
– Overload at the 24 V Safe output level
– External feed-in recognised from field side
– Internal error detected
– Interruption in one of the two safety loops of a safety circuit for at least
3 seconds.
– Cross connection between the safety loops for at least 3 seconds.
1.1 Off: Safety circuit 1 interrupted
Yellow: Safety circuit 1 OK
2.1 Off: Safety circuit 2 interrupted
Yellow: Safety circuit 2 OK
4.1 Off: SS1 not active
(DELAY only) Yellow: SS1 active, 24 V DC at output
4.2 Off: 24 V Safe not active
Yellow: 24 V Safe active, 24 V DC at output
4.3 Green: Feed-in voltage in valid range
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Recommended action
– Check that the module has been snapped into place properly
– Check the supply voltage:
– Check channel error
– Remove cross connection at 24 V Safe
– Measure voltage at 24 V Safe (4.3) vs. GND (4.4).
If a voltage is present, check the wiring!
Attention: safety hazard! Shut down the system and prevent it from
switching on again!
– Module might have switched off caused by overtemperature; check the
– Perform a cold start within 24 hours.
If the error has not been fixed, send the module to Weidmüller for a technical
examination
– Check safety circuit for interruptions if an interruption of the safety
– Check safety circuit for cross connections
Check safety circuit 1
Check safety circuit 2
u-remote IP20 modules for functional safety manual
1. check +24 V input current path
2. check voltage on plug 4.3; in case of cascading 0 V might be properly,
therefore this is not an error
temperature inside the switch cabinet
channel is not part of the application
1484600000/04/06.2017