Table of Contents
1 OVERVIEW
1 OVERVIEW 1.1 INTRODUCTION
The GE Power Management PQM Power Quality Meter is an ideal choice for continuous monitoring of a single
or three-phase system. It provides metering for current, voltage, real power, reactive power, apparent power,
energy use, cost of power, power factor, and frequency. Programmable setpoints and four assignable output
relays allow control functions to be added for specific applications. This includes basic alarm on over/under
current or voltage, unbalance, demand based load shedding, and capacitor power factor correction control.
More complex control is possible using the four switch inputs; these can also be used for status information
such as breaker open/closed, flow information, etc.
As a data gathering device for plant automation systems that integrate process, instrument, and electrical
requirements, all monitored values are available via one of two RS485 communication ports running the Mod-
bus protocol. If analog values are required for direct interface to a PLC, any of the monitored values can output
as a 4 to 20 mA (or 0 to 1 mA) signal to replace up to 4 separate transducers. A third RS232 communication
port connects to a PC from the front panel for simultaneous access of information by other plant personnel.
With increasing use of electronic loads such as computers, ballasts, and variable frequency drives, the quality
of the power system is important. With the harmonic analysis option, any phase current or voltage can be dis-
played and the harmonic content calculated. Knowledge of the harmonic distribution allows action to be taken
to prevent overheated transformers, motors, capacitors, neutral wires, and nuisance breaker trips. Redistribu-
tion of system loading can also be determined. The PQM can also provide waveform and data printouts to
assist in problem diagnosis.
Economical system monitoring or control is possible by selecting the non-display chassis model as a system
component and adding required options to obtain the desired level of functionality.
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Monitor: A, V, VA, W, var, kWh, kvarh, kVAh, PF, Hz
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Demand metering: W, var, A, VA
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Setpoints for alarm or control from most measured values, including: unbalance, frequency, power factor,
voltage, and current
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4 output relays / 4 switch inputs for flexible control configuration
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4 isolated analog outputs replace transducers for PLC interface
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1 4-20 mA analog input
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Modbus communications
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Three COM ports (two rear RS485 ports and one front RS232 port) for access by process, electrical, main-
tenance, and instrument personnel
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Harmonic analysis for power quality review and problem correction
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40-character display and keypad for local programming
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Free PQMPC software for setpoint entry or monitoring from a PC
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Simulation mode for testing and training
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Compact design for panel or chassis mount
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AC/DC control power
GE Power Management
PQM Power Quality Meter
1.1 INTRODUCTION
1.1.1 DESCRIPTION
1.1.2 FEATURE HIGHLIGHTS
1
1-1
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