GE EPM 5300 User Manual download pdf (Page 11)

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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 FEET

5.0 VA 15 FEET

7.5 VA 30 FEET

10.0 VA 40 FEET

15.0 VA 60 FEET

30.0 VA 120 FEET

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

OPTION 1: ISOLATING A CT CONNECTION REVERSAL 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.

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GE EPM 5300 User Manual Page 11

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