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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.
Page 8
START
Alarm
END
Audible/Visual
Red Service
LED Lit?
All
Front Panel
Green LEDs
Lit?
No
Apparent
Problem
No Yes
No
Possible
Display
Board
Failure.
Call APC
Technical
Support
Have
Electrician
Verify Voltage is
Phases?
Yes
Have Electrician
Power Utility
Feed and
Verify
Power Levels
and
Operation
No
Yes No
Figure 4. Troubleshooting Flow Chart
END
END
WARNING
SECURE ALL
POWER
(REMOVE POWER)
TO THE SPD
1-800-800-4APC
All
Front Panel
Green LEDs
Lit?
Possible
Unit
Failure.
Call APC
Technical
Support
1-800-800-4APC
Yes
Correct
Correct on all