Emerson 200I/48-NT5C05C user manual Troubleshooting

54 Troubleshooting

Table 16 – Diagnosing system faults

Fault symptom	Possible causes
The AC ON LED is not	• No ac input voltage.
lit.	• 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	• The fuse of one or both fans has blown.
lit.	• 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	• One, or both, remote sense leads is
lit.	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 ).
	—end—

UM5C05C P0745680 Standard 6.00 October 2001 Emerson Energy Systems