1–12
EPM 5100 ELECTRONIC POWER METER – USER GUIDE
CHAPTER 1: OVERVIEW
1.5
Applications
1.5.1
Typical Applications
The EPM 5100 Electronic Power Meter can be used on three- or four-wire, three-phase
systems having a nominal frequency of from 45 to 65 hertz. See the order code table
above for configurations. The EPM 5100 Electronic Power Meter accepts the following
combinations of inputs:
• two voltage inputs and two current inputs for three-phase, three-wire delta
systems
• two or three voltage inputs and three current inputs for four-wire wye systems
Potential transformer (PT) primaries may be connected line-to-line or line-to-neutral. Two
PTs, connected open delta, can be used for a line-to-line connection.
PT and current transformer (CT) ratios are configured in Program mode. With these ratios
configured, the EPM 5100 Electronic Power Meter automatically calculates primary
currents, voltages, power, and energy.
1.5.2
PT and CT Inputs
The EPM 5100 Electronic Power Meter can be ordered to accept direct voltage inputs from
69 to 600 volts. For system voltages greater than 600 V, the customer must supply external
PTs. The PT turns ratio is configured in Program mode and has a range of 0.5:1 to 9999:1.
See
on page 4–16 for details on setting the PT ratio.
The meter current inputs are rated at 5 A AC, nominal. The customer must supply the
external CTs. Fourth-wire neutral CT inputs are not accepted; however, the EPM 5100
Electronic Power Meter calculates and displays the neutral current. The CT turns ratio is
configured in the Program mode and has a range of 0.5:1 to 99,999:1. See
page 4–16 for details on setting the CT ratio. The meter has a continuous overload
capability of 10 A and a CT burden of 0.25 VA.
