GE EPM 3000P - Manual (Page 36)

CHAPTER 9
P
ROGRAMMING
GROUP 2: M
ETER
C
ALIBRATION
9.1 S TANDARD C ALIBRATION
WARNING - R EAD THIS S ECTION C AREFULLY B EFORE P ROCEEDING
⌦
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 9-1 for 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.
T ABLE 9-0: G ROUP 2 P ROGRAMMING F ORMAT
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)
T ABLE 9-1: S OURCE , F ULL S CALE AND V ALUE S ETTINGS FOR C ALIBRATION
CALIBRATION TYPE/
RANGES
CALIB. SOURCE
NECESSARY
FULL SCALE SETTING CALIBRATION VALUE
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