GE RSTi-EP - Page 71

Chapter 7. LED Indicators and Troubleshooting
GFK-2956A November 2017 67
EP-1902,
EP-1922
Status
LED
Red:
– Module has not been snapped
properly
– Error in the supply voltage
– Channel error
– Check that the module has been snapped into place
properly
– Check the supply voltage:
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
– Check channel error
– Overload at the OSSD output level
– Remove cross connection at OSSD
– External feed-in recognised from
field side
– Measure voltage at OSSD (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.
– Internal error detected
– Module might have switched off caused by
overtemperature; check the temperature inside the
switch cabinet
– Perform a cold start within 24 hours.
If the error has not been fixed, send the module to GE
for a technical examination.
– Interruption in one of the two
safety loops of a safety circuit for
at least 3 seconds.
– Check safety circuit for interruptions if an
interruption of the safety channel is not part of the
application
– Cross connection between the
safety loops for at least 3 seconds.
– Check safety circuit for cross connections
1.1
Off: Safety circuit 1 interrupted
Yellow: Safety circuit 1 OK
Check safety circuit 1
2.1
Off: Safety circuit 2 interrupted
Yellow: Safety circuit 2 OK
Check safety circuit 2
4.1
(DELAY
only)
Off: SS1 not active
Yellow: SS1 active, 24 V DC at output
4.2
Off: OSSD not active
Yellow: OSSD active, 24 V DC at output
4.3
Green: Feed-in voltage in valid range