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OPERATION and FEATURES
SPD's do not require operator intervention after installation. However, the LEDs should be checked weekly to ensure
that the SPD is functional.
NOTE: The PMH3XLM has a green LED for each phase which extinguish when the module is no longer providing
protection (fault condition). The only serviceable part is the Display Board Assembly (see Service Manual).
The PMH3XLM contains a diagnostic circuit which monitors the suppressors status continuously and automatically.
If a fault condition were to occur, the built-in front panel audible alarm will sound and a red "Service" LED will light,
indicating that the unit is in need of service by a qualified electrician.
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Figure 2. Typical Parallel Connections
Phase A
Phase B
Phase C
Ground
Neutral Bus
Ground Bus
Phases
Neutral
(if used)
Ground
To "Protected" Loads
Interconnecting Wiring
* Minimize Length
* Avoid Sharp Bends
Neutral
WARNING
• MAINTENANCE or INSTALLATION OF THIS SURGE PROTECTIVE DEVICE MUST BE
PERFORMED BY QUALIFIED PERSONNEL ONLY.
• DURING NORMAL OPERATION, HAZARDOUS VOLTAGES ARE PRESENT INSIDE THE UNIT.
• WHEN HAVING THIS UNITSERVICED, ENSURE SERVICE PERSONNEL FOLLOW ALL
ELECTRICAL SAFETY PRECAUTIONS (See Service Manual).
• ALL POWER SOURCES TO THIS UNIT SHOULD BE LOCKED OFF BEFORE SERVICING.
THIS WILL PREVENT THE RISK OF RECEIVING AN ELECTRICAL SHOCK.