GE EPM 3000P instruction manual Volts 4/1 PT

CHAPTER 9

PROGRAMMING GROUP 2: METER CALIBRATION

9.1STANDARD CALIBRATION

WARNING - READ THIS SECTION CAREFULLY BEFORE PROCEEDING

⌦Calibration does not need to be accomplished to change CT or PT ratios. (See GROUP 1).

⌦Meter calibration cannot be performed if the meter is installed for service. The sensing must be connected to a power supply with variable voltage and separate current outputs.

⌦The calibration procedure requires highly accurate and stable input signals. Incorrect readings result from improper calibration procedures. If unsure, return unit to the factory for calibration.

⌦BEFORE calibrating any channel, make note of its Full Scale Setting (see Ch. 8). Set the Full Scale in accordance with Table 9-1for calibration. Restore original Full Scale Setting when calibration is completed.

⌦The first function in GROUP 2 (STD.CORR) is NOT to be changed by the user. Please make

note of the value here ( ) before using any other function in this Group. If the STD.CORR value is inadvertently lost or changed, contact the factory for assistance.

All sensitive electronic measuring devices drift slightly over time, requiring periodic calibration. We recommend returning the meter to the factory on a yearly basis.

TABLE 9-0: GROUP 2 PROGRAMMING FORMAT

FUNCTION NUMBER	FUNCTION
P.	Standard Correction. Factory Procedure only.
0.	High End Calibration, VOLTS AN
1.	High End Calibration, VOLTS BN
2.	High End Calibration, VOLTS CN
3.	High End Calibration, AMPS A
4.	High End Calibration, AMPS B
5.	High End Calibration, AMPS C
6.	Low End Calibration, AMPS A
7.	Low End Calibration, AMPS B
8.	Low End Calibration, AMPS C
E.	Exit Programming GROUP 2

The Full Scale and Calibration values should be equal during the calibration procedure. The meter may be rescaled without calibrating by changing the full scale in GROUP 1, FUNCTION 0 or 1. (See Table 9-1)

TABLE 9-1: SOURCE, FULL SCALE AND VALUE SETTINGS FOR CALIBRATION

CALIBRATION TYPE/	CALIB. SOURCE	FULL SCALE SETTING	CALIBRATION VALUE
RANGES	NECESSARY
VOLTS 120/208V	120V	120V	120
VOLTS 277/480V	300V	300V	300
VOLTS 4/1 PT	120V	480V	480
VOLTS 60/1 PT	120V	7.20KV	7.20
AMPS Hi End 1000/5 CT	5A	1000A	1000
AMPS Hi End 5000/5 CT	5A	5.00KA	5.00
AMPS Lo End 1000/5 CT	2.5A		500
AMPS Lo End 5000/5 CT	2.5A		2.50
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GE Industrial Systems