American Power Conversion PM4Y, PM3 user manual Periodic Inspection and Cleaning, Troubleshooting

WARNING

•MAINTENANCE OF THIS SURGE PROTECTIVE DEVICE SHOULD BE PERFORMED BY QUALIFIED ELECTRICAL PERSONNEL ONLY.

•DURING NORMAL OPERATION, HAZARDOUS VOLTAGES ARE PRESENT INSIDE THE UNIT.

•WHEN SERVICING THIS UNIT, BE SURE TO FOLLOW ALL ELECTRICAL SAFETY PRECAUTIONS.

•ALL POWER SOURCES TO THIS UNIT SHOULD BE LOCKED OFF BEFORE SERVICING. THIS WILL PREVENT THE RISK OF RECEIVING AN ELECTRICAL SHOCK.

Periodic Inspection and Cleaning

Inspection of the SPD should be performed periodically to maintain reliable system performance and continued transient voltage surge protection. While it is difficult to establish a preventive maintenance schedule because conditions vary from location to location, inspections for trouble utilizing the on-line diagnostics should be performed on a routine basis, weekly or monthly.

Every effort should be made to ensure that the SPD remains clean and dry. A towel may be used to wipe the exterior of the enclosure. Avoid excess moisture and dry with a towel as appropriate.

Corrective Maintenance and Repairs

Surge Protective Devices (SPD) are designed for years of reliable, trouble free operation. Unfortunately, even the most reliable equipment can fail.

Built-in diagnostics are an integral part of the SPD and will aid in isolating which of the protection module(s) have failed. To keep the SPD operating at peak performance, replacement of any bad module should be performed according to surge module removal and replacement instructions at the earliest service opportunity.

If a single module on a particular phase fails, the fuse takes the module off-line. It is recommended by APC that if a module fails on any specific phase, that all modules on that phase be replaced at the same time, according to module removal instructions that follow.

Standard troubleshooting procedures should be used to isolate other problems not associated with failed modules. Fee Figure 6 (Troubleshooting Flowchart) for assistance. Replace bad components with identically rated parts to continue proper opera- tion and safety. It is very important that fuses be replaced with the exact fuse specified on the fuse replacement warning label shipped with each unit. This label is found on the SPD mounting plane.

After all failed modules have been replaced, prior to returning power, inspect the entire SPD for other damaged components and replace as necessary. Table 4 lists typical replacement parts.

Troubleshooting

Troubleshooting of an SPD consists of performing the sequence of steps provided in the Troubleshooting Flowchart in Figure 6. Perform the steps in this chart only to the extent necessary to clear the failt.

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