Figure 91: More information about the fault
On the WHMI, internal fault information is shown under Self-Supervision Status.
Figure 92: Internal fault information on Web HMI
Table 9: Internal fault indications and codes
Fault indication
Fault
code
Additional
information
Fast self-
recovery
attempt
Slow 10min
self-
recovery
(# of
attempts)
Immediate
IRF-mode
Action in permanent fault
state
Internal Fault
System error
2 Start up error:
HW/SW mismatch
No No Yes If relay SW has just been
updated, redo it. If not re-
covered, contact your near-
est ABB representative to
check the next possible
corrective action.
Internal Fault
System error
2 Start up or runtime
error: Data bus er-
ror, CPU module
Yes Yes (3) No Restart the relay. If recov-
ered by restarting, contin-
ue relay normal operation.
Table continues on the next page
Troubleshooting 1MRS759118 D
92 REX640
Operation Manual
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