3Com PSE2500-A3 Controller Rectifier Possible Alarm Display Problems Status, Possible solution

User Manual	Chapter 5 Engineering
PSE2500-A3 External PoE	Maintenance and
Power System	Troubleshooting

Table 5-1Troubleshooting guide

Controller	Rectifier		Possible
alarm	display		problems
status
		z	The	AC
			power	input
			circuit
RUN			breakers
	NONE		has
ALM			operated.
		z	AC	input
			voltage	is
			too low or
			power lost
RUN	AC OK	Rectifier failure
		Output beyond
ALM	FAULT
		normal range
RUN	AC OK	Communication
	DC OK	error between
ALM		the rectifier and
	FAULT
		the controller
		Rectifier has no
		output and it is
		in standby
RUN		mode;
	AC OK	Over load;
ALM
		Ambient
		temperature is
		too high
		Rectifier failure;

Possible solution

zVerify that AC power input circuit breaker is closed; close circuit breaker if it is open.

zVerify the AC power is present and in normal range

Replace the rectifier

Replace the rectifier

Command the rectifier to work or reset the controller

Check if the load is over the rating.

Check the ambient temperature.

Replace the rectifier

5-2