Kikusui PLZ-3WH Series, Operation Manual

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Chapter 4: Operating Procedure
4-59
Calibration of Ammeter for Parallel Operation
Each ammeter of the load unit is calibrated before shipment from the factory. However, when the ammeters are
calibrated with the load units connected in parallel, higher accuracy is obtained.
After installation and connections for parallel operation are complete, provide the below-described calibration for the
master unit. For information on preparation, measuring equipment, connection, and entry into calibration mode, see
Chapter 6, “Maintenance and Calibration”.
(1) Select the calibration mode, select the ammeter
offset calibration item “offsIadSum” from the menu
with [ ] and [ ] keys, and press the [LOAD] switch
to turn on the load. Apply a voltage to the load
terminal so that the voltmeter reads 20.0 V, and use
the jog-shuttle to set the ammeter to 0.00 A.
(2) Using [ ] and [ ] keys, select the ammeter
maximum calibration item “gainIadSum” from the
menu. Press the [LOAD] switch to turn on the load,
apply a voltage to the load terminal so that the
voltmeter reads 20.0 V, and use the jog-shuttle to set
the ammeter to the value listed in the table below.
NOTE
If the maximum calibration is carried out after the offset calibration, the offset may deviate from the
calibrated value. Therefore, repeat these two calibrations alternately until the desired level is obtained.
3) Press the [ESC] key to escape from the calibration mode.
Per-Model Ammeter Reading at Ammeter Maximum Calibration
Electronic No. of units operated in parallel
load unit Two Three Four Five
PLZ153WH 3.150A 4.725A 6.300A 7.875A
PLZ303WH 6.30A 9.45A 12.60A 15.75A
PLZ603WH 12.60A 18.90A 25.20A 31.50A
PLZ1003WH 21.00A 31.50A 42.00A 52.50A
Ammeter reading at calibration of “gainIadSum”
0.00A 20.0V 0.0W
CC offsIadSum 35
25.20A 20.0V 126.0W
CC gainIadSum 22539