GE RSTi-EP - Page 70

Chapter 7. LED Indicators and Troubleshooting
66 RSTi-EP Functional Safety Manual GFK-2956A
LED Indicators and Troubleshooting
Attention
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
Recommended action
EP-1901
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 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
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
Recommended action