GE Multilin
Sub Meters
37
NOTE 1: The EPM 2000’s Field Programmable PT and CT Primary or secondary Settings may be
utilized to Calibrate out the PT and CT amplitude error, for improved accuracy.
5.3. Voltage Signal Connections
For proper meter operation, the voltage connection
must
be maintained. The voltage must
correspond to the correct terminal. The cable required to terminate the voltage sense circuit
should have an insulation rating greater than 600V AC and a current rating greater than 0.1 A.
There are 4 Voltage input terminals marked V1, V2, V3 and Vn. See the wiring diagrams
that follow, for details.
For Delta connection, the Vn terminal should be left un-
connected.
5.3.1. PT Connections
The EPM 2000 directly accepts LT voltage inputs of up to 600 V ac rms Line to Line (347 V
L-N). Voltages greater than this, typically HT systems, must be connected through Potential
Transformers (PTs). The EPM 2000 allows Field Programming of both PT Primary and
Secondary voltages. See the voltage input overload graph for more detail
Field Programmable PT Primary range : 0.1 kV to 999 kV AC RMS L-L.
Field Programmable PT Secondary range : 100v to 600v AC RMS L-L.
EPM 2000 Voltage Input burden : 0.2 VA per input.
See the
Setup (Field Programming) section
for programming details.
IMPORTANT: The PT Primary and Secondary values must be User Programmed
before using the Meter. Otherwise, the readings will be wrong.
5.3.2. Selecting the Voltage Fuses
We strongly recommend using fuses on each of the sense voltages and the control / auxiliary
power, although connection diagrams often do not show them. Use a 1 Amp fuse on each
voltage input.
5.4. Current Signal Connections
The meter accepts up to 6 A AC rms per channel directly. Above that, a Current Transformer
must be interposed to scale down the current.
There are three pairs of Current Input terminals marked A1
1
-A1
2
, A2
1
-A2
2
and A3
1
-A3
2
. For
proper measurements, the phase identification as well as the polarity of the current signals
must be correct. The Forward flow (Import by consumer) current direction must be into the
A1
1
terminal and the exit from the A1
2
terminal. Please maintain the correct sequence and
polarity to avoid wrong readings.
Any unused current input terminals (eg A2
1
, A2
2
for Delta) must be shorted together. The
shorted terminals do not need to be grounded.
Install the wiring for the current circuit at 600V AC insulation as a minimum. The cable
connection should be rated for 7.5 Amps or greater and have a cross-sectional area of 16
AWG minimum.
CAUTION
:
Before wiring, de-energize the PT secondary by
opening the circuit or removing the fuse. Do not short the PT secondary.