Pacific UPC-32 Operation Manual page 82

SECTION 4 OPERATION
4.6.3.1.1 PROGRAMMABLE OUTPUT IMPEDANCE SETUP MENUS (cont)
CARELESS OR IMPROPER USE OF THE PROGRAMMABLE OUTPUT IMPEDANCE FUNCTION
MAY RESULT IN OVER-VOLTAGE OR UNDER-VOLTAGE BEING PRESENTED TO THE LOAD,
REACTIVE LOADS MAY CAUSE THE OUTPUT POWER TO BECOME UNSTABLE (OSCILLATE)
AND MAY CAUSE DAMAGE TO THE LOAD IF EXCESSIVE NEGATIVE IMPEDANCE IS USED!
4.6.3.1.1.1 PROGRAMMABLE OUTPUT IMPEDANCE CALIBRATION MENU
Press EDIT again, while the PROG. Zo menu is displayed, to access the Prog Zo Calibration screens to
enter special calibration values for the Prog Zo function.
NOTE: Each power source is pre-calibrated at the factory, but if re-calibration of this function is desired,
or if the RAM (memory) in the UPC has been lost or erased, use this screen to enter new calibration
values. The calibration procedure is listed below.
Form Z direct
1
2
3
Form column:
Z direct column:
XFMR ratio column:
Z xfmr column:
The Z direct and Z xfmr values calibrated at the factory are compensated for the power source
impedance at the output terminal of the power source. To compensate for additional wiring, fixtures,
magnetics, etc., follow the calibration procedure; include the external devices in the measurements.
CAUTION
USE THIS FUNCTION WITH CARE
AND MAY CAUSE DAMAGE TO THE LOAD.
XFMR ratio
0.006 | 1.50
0.032 | 2.00
0.016 | 2.50
indicates the Power Form of operation (1, 2 or 3 phase).
accepts the Direct coupled impedance of the power source (per phase) for
each Power Form listed on the far left. During DIRECT coupled operation, the
proper Z direct value is used to calibrate the PROG Zo function based upon the
Power Form selected in the Program being executed.
accepts up to 3 separate XFMR ratios. Typically only one will be entered.
accepts the impedances of the XFMR listed in the XFMR ratio column.
During XFMR coupled operation, the proper Z xfmr value is used to calibrate
the PROG Zo function based upon the XFMR ratio selected in the Program
being executed.
Z xfmr
0.450
1.400
2.970
70