Greenlee MPM-120 Instruction Manual page 2

Description
Greenlee Microprocessor-Controlled Phase Monitors are intended to protect fixed
equipment from the following conditions: Under-voltage, over-voltage, phase reversal,
phase shift, phase loss, phase unbalance, frequency shift and regeneration. They have
DPDT (double pole, double throw) output contacts for connection to equipment
controller or to an alarm. When the phase monitor detects that the power supplied by
the circuit is outside of the specified tolerances, it opens the NO contacts and closes
the NC contacts.
Red LEDs indicate fault conditions to simplify troubleshooting; a green LED indicates
that the power provided is within the specified tolerances after a fault is cleared.
Greenlee offers several models of microprocessor-controlled phase monitor: MPM-120,
MPM-230, MPM-380, MPM-440, and MPM-575. The digits in the catalog number
signify the corresponding nominal circuit voltage.
Safety
Safety is essential in the use and maintenance of Greenlee tools and equipment. This
instruction manual and any markings on the tool provide information for avoiding
hazards and unsafe practices related to the use of this tool. Observe all of the safety
information provided.
Purpose
This instruction manual is intended to familiarize all personnel with the safe operation
and maintenance procedures for the following Greenlee Microprocessor-Controlled
Phase Monitors:
MPM-120
MPM-230
MPM-380
Keep this manual available to all personnel.
Replacement manuals are available upon request at no charge.
Greenlee and
2
MPM-440
MPM-575
are registered trademarks of Greenlee Textron.
KEEP THIS MANUAL