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54 Troubleshooting
UM5C05C P0745680 Standard 6.00 October 2001 Emerson Energy Systems
Table 16 – Diagnosing system faults
Fault symptom Possible causes
The AC ON LED is not
lit.
• 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 FAN ALM LED is
lit.
• 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.
The SEN FAIL LED is
lit.
• 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 CL LED is lit. • 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 ).
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