American Power Conversion PMH3XLM user manual Corrective Maintenance Repair, Troubleshooting

CORRECTIVE MAINTENANCE (Repair)

SurgeArrest PMH3XLM units are designed for years of reliable, trouble-free operation. However, even the most reliable equipment can fail.

Built-in diagnostics are an integral part of the PMH3XLM and indicate if service is required. Audible alarms and abnormal illumination of LEDs indicate problems within the PMH3XLM, and possibly within the electrical system.

Quality SPDs, such as the PMH3XLM, are designed and tested to withstand severe duty. However, various electrical distribution problems exist that a PMH3XLM will not protect against. Should a problem arise, a qualified electrician should first perform an overview of the electrical distribution system, including verification of proper voltages and phasing. Regardless of the cause, PMH3XLMs will sacrifice themselves while attempting to protect their load. Accordingly, a failed PMH3XLM may indicate other problems, as its failure is the effect rather than the cause.

Standard troubleshooting procedures should be used to isolate problems. See Figure 4 (Troubleshooting Flowchart) for assistance. Replace bad components with identically rated parts to continue proper operation and safety. Note: The only replaceable component of the PMH3XLM is the Display Board, or the unit itself.

Troubleshooting

Troubleshooting of an SPD consists of performing the sequence of steps provided in the Troublshooting Flow Chart in Figure 4. Perform the steps in this chart only to the extent necessary to clear the fault.

		Alarm	No	All	Yes	No
START		Audible/Visual		Front Panel		Apparent	END
		Red Service		Green LEDs
						Problem
		LED Lit?		Lit?
		Yes		No
Possible				Have		Have Electrician
Display		All				Correct
Board	Yes		No	Electrician	No	Power Utility
		Front Panel		Verify Voltage is		Feed and
Failure.
		Green LEDs		Correct on all		Verify
Call APC
		Lit?		Phases?		Power Levels
Technical
						and
Support						Operation
1-800-800-4APC				Yes
				WARNING
				SECURE ALL
END				POWER		END
				(REMOVE POWER)
				TO THE SPD
				Possible
				Unit
				Failure.
				Call APC
				Technical
				Support
				1-800-800-4APC
		Figure 4. Troubleshooting Flow Chart

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