CHAPTER 1: OVERVIEW INTRODUCTION
PQM POWER QUALITY METER – INSTRUCTION MANUAL 1–3
FIGURE 1–2: PQM Feature Highlights - 2
1.1.3 Applications • Metering of distribution feeders, transformers, generators, capacitor banks, and
motors
• Medium and low voltage three-phase systems
• Commercial, industrial, utility
• Flexible control for demand load shedding, power factor, etc.
• Power quality analysis
• System debugging
823755AL.CDR
FUSE ACCESS
ANALOG INPUT
Control power fuse accessible under sliding
door.
Accept 4-20mA analog inputs for transducer
interface.
VT INPUTS:
0-600V,3wire or 4 wire voltage inputs.
Direct (up to 600V) or VT (>600V for
isolation) connections.
CT INPUTS:
GROUND:
3 isolated phase CT inputs
1 isolated neutral CT input
1 Amp or 5 Amp secondary
Separate safety and filter ground
All inputs meet C37.90 and IEC 801-2
EMI,SWC, RFI interference immunity.
AC/DC CONTROL POWER
Universal control power
90-300 VDC
70-265 VAC
COMPACT DESIGN
Panel mount replaces many discrete
components with one standard model.
PROGRAM UPDATING
Flash memory storage of firmware for field
updating via communications port.Enables
product updating on-site for latest features.
COMMUNICATIONS
Dual RS485 comm ports Modbus protocol.
Continuous monitoring/control via
SCADA system rear (RS485).
Front (RS232) or rear (RS485) access
allows simultaneous communication
via a PC or for redundant comms.
®
COM1
COM2/3
ANALOG OUTPUTS
4isolated 0-1mA or 4-20 mA outputs replace
8 transducers. Programmable including:
A, V, W, var, VA, Wh varh, PF, Hz
SWITCHINPUTS
A
B
C
D
Programmable for relay activation,
counters, logic, demand synchronization,
setpoint access, alarm position
4 OUTPUT RELAYS
ALARM
AUX1
AUX2
AUX3
Programmablealarm conditions
actuated by programmable
setpoints, switch inputs, remote
communication control.
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Courtesy of NationalSwitchgear.com
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