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TROUBLESHOOTING
Internal System Faults
Error Descripon Cause
F.915
Communicaon error
between main board
processor and I/O
processor.
Hardware defect.
F�920
Internal 2.5 V reference
voltage incorrect.
Hardware defect.
F�921
Internal 15 V voltage
incorrect.
Hardware defect.
F�922
External Stop circuit not
complete.
‒ Not all External STOP inputs are separately
jumpered although the enre External Stop
circuit is jumpered.
‒ Redundant checking of the External Stop circuit
tripped.
F�928
Photo Eye input failed
monitoring test.
‒ Issues with photocells or photocell circuit need
to be addressed.
‒ Also possible if the primary operator LCD
displays fault F�7A2 at the me the monitoring
test is run; secondary operator will fail,
displaying fault F928.
F�930
External watchdog
incorrect.
Defecve hardware or noise-saturated environment.
F�931
ROM error. ‒ Wrong EPROM code.
‒ Defecve hardware or noise-saturated
environment.
F�932
RAM error. Defecve hardware or noise-saturated environment.
F.935
Stack error. ‒ User Stack or System Stack overow.
‒ Defecve hardware or noise-saturated
environment.
F�960
Wrong parameter
checksum.
‒ New EPROM version with dierent parameters.
‒ Controller not yet inialized.