GE EPM 5200 - Manual (Page 11)

CHAPTER 3: ELECTRICAL INSTALLATION
GE Industrial Systems 5300P Advanced Power Meter 7
CHAPTER 3
ELECTRICAL INSTALLATION
3.1: Connecting the Current Circuit
Install the wiring for the current at 600V AC insulation as a minimum. The cable connector should be
rated for 6 Amps or greater and have a cross-sectional area of 16 AWG minimum.
Mount the current transformers (CTs) as close as possible to the meter for best accuracy. The following
table illustrates the maximum recommended distances for various CT sizes, assuming the connection is
via 16 AWG cable.
CT Size Maximum Distance (CT to Meter)
2.5 VA 10 F EET
5.0 VA 15 F EET
7.5 VA 30 F EET
10.0 VA 40 F EET
15.0 VA 60 F EET
30.0 VA 120 F EET
Table 3.1: CT Size and Maximum Distance
WARNING:
DO NOT leave secondary of the CT open when primary current is flowing. This causes high voltage that
will overheat the secondary of the CT. Use a shorting block on the secondary of the CT.
3.2: CT Connection
If the meter is connected directly to the current (up to 10 Amps max.), maintain the exact connection to
avoid incorrect polarity.
When the meter is connected using the CTs, you must maintain the correct CT polarities. CT polarities
are dependent upon correct connections of CT leads, and upon the direction the CTs are facing when
clamped around conductors. The dot on the CT must face the line side; the corresponding secondary
connection must connect to the appropriate input on the meter. Failure to connect CTs properly results in
inaccurate power readings. If your meter is not reading power properly, it is more than likely the CT is
incorrectly wired.
Note: CTs are shorted if connected to the terminal block model DSP2 or 3 even if it is detached
from the meter.
HELPFUL DEBUGGING TOOLS
O PTION 1: I SOLATING A CT C ONNECTION R EVERSAL POWER READING
If your meter does not read the correct watts after installation, it almost always means that the CT’s have
been wired in the wrong polarity. To check the polarity of the CT after the monitor has been installed, look
at the single phase WATT readings to see that each of the readings are positive (assuming you are
consuming power). If one of the WATT readings is negative, that particular phase CT is reversed.
To check the single phase WATT reading, press the Power button twice while the annunciator is
positioned to WATTS. Then press the Phase/Next button to cycle through the phases. After connecting
the polarity of the CTs, the WATT and VAR readings should be correct.