Chapter 1 Introduction 1
1 Introduction
1.
The PM290 is a 3-phase AC Powermeter specially designed to meet
the needs of users ranging from electrical panel builders to substation
operators. The PM290 performs all basic power measurements; Option
L provides ground leakage current measurements (instead of external
synchronization).
Measured Parameters
The PM290 measures and displays the following parameters:
Parameter PM290 Option L
True RMS voltage (3-phase or line-to-line)
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True RMS current per phase
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Active Power
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Apparent Power
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Reactive Power
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Active Power Maximum Demand
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Active Power Accumulated Demand
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Ampere Maximum Demand per phase
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Apparent Power Maximum Demand
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1
System Power Factor
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Active Energy (Consumption)
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Returned Energy
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Reactive Energy
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Frequency
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Unbalanced Current (Zero Sequence) - for 4
wire system
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Ground Leakage Current (Option L)
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External Synchronization Input
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1
This parameter can be read only via Modbus communications.
Control and Alarm Relays
Four programmable relays provide alarms, control and load shedding.
Any combination of setpoints listed below can be assigned to any relay.
See Section 3.13.
• High current • High apparent power
• High voltage • High reactive power
• Low voltage • Low power factor
• High active power accumulated demand
• High unbalanced current (zero sequence) or
High ground leakage current (Option L)
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