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54 Troubleshooting
Table 16 – Diagnosing system faults
The AC ON LED is not
lit.
The FAN ALM LED is
lit.
The SEN FAIL LED is
lit.
The CL LED is lit.
UM5C05C P0745680 Standard 6.00 October 2001
Fault symptom
Possible causes
No ac input voltage.
The input circuit breaker is open.
AC voltage is present but is out of operational
limits. The unit will restart when the ac returns to
the operating level.
AC has just been applied and the rectifier will
momentarily start ( after an inrush control
delay ).
The fuse of one or both fans has blown.
One or both fans have failed.
Note 1 : If a single fan failed or a fuse blew, the
rectifier will continue to operate while
triggering a local and remote FAN ALM.
Note 2 : If two cascaded fans failed or both fuses
blew, the rectifier will shut down and
trigger local and remote RFA alarms.
One, or both, remote sense leads is
disconnected.
Excessive impedance in one or both sense
leads.
The dc circuit breaker is open but the unit is in
remote sense.
The output load requirement exceeds the total
rectifier capacity.
With paralleled units, the float or equalize is
maladjusted causing one or more units to carry
the load.
The unit is in "equalize" mode and paralleled
units are not.
The remote sense lead has excessive
impedance on one or more rectifiers.
The system batteries are in recharge mode after
an ac outage.
The current share mode selection is not the
same for all units.
The forced share line is disconnected ( in FLS
only ).
—end—
Emerson Energy Systems
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