GE RSTi-EP Functional Safety Manual page 70

Chapter 7. LED Indicators and Troubleshooting
LED Indicators and Troubleshooting
In the event of a malfunction occurring on a RSTi-EP station, carry out the
following recommended measures. If the malfunction cannot be fixed, send the
affected product to GE (refer to the section, General Contact Information).
GE does not assume any liability If the base or electronic module has been
tampered with.
Module LED Status
EP-1901 Status Red:
LED
– Module has not been snapped
– Error in the supply voltage
– Channel error
– Overload at the OSSD output level
– External feed-in recognised from
– Internal error detected
– Interruption in one of the two
– Cross connection between the
1.1 Off: Safety circuit 1 interrupted
Yellow: Safety circuit 1 OK
4.2 Off: OSSD not active
Yellow: OSSD active, 24 V DC at output
4.3 Green: Feed-in voltage in valid range
Module LED Status
66
properly
field side
safety loops of a safety circuit for
at least 3 seconds
safety loops for at least 3 seconds
RSTi-EP Functional Safety Manual
Attention
Recommended action
– Check that the module has been snapped into place
properly
– Check 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
– Remove cross connection at OSSD
– 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
– 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
– Check safety circuit for interruptions if an
interruption of the safety channel is not part of the
application
– Check safety circuit for cross connections
Check safety circuit 1
Recommended action
GFK-2956A