GE RSTi-EP - Page 412

Chapter 12 LED Indicators and Troubleshooting
GFK-2958E RSTi-EP User Manual 408
Safety modules
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 pin (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
1.2
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