AMETEK BPS Series - Manual (Page 128)

User Manual AMETEK Programmable Power
BPS Series 128
7.4.2 Three Phase Mode
As indicated earlier, for 3-Phase power system (BPS30-3, BPS45-3, BPS75-3, BPS90-3, BPS150-3 and
BPS180-3), repeat the preceding steps for the Phase B and C outputs. The order in which the outputs for
each phase are calibrated is not important.
Press the PHASE key to select each output to be calibrated. Monitor the output of the respective phase by
moving the HI input of the Digital Multimeter. The LO input should remain connected to the common LO
of the sense connector.
7.4.3 Phase Angle Calibration
Output phase angle calibration is required only on BPS Series models capable of three-phase mode
operation. A phase meter is required to perform this calibration.
This calibration can be done in either high or low voltage range as long as the maximum input voltage of
the phase meter input is not exceeded. Select AC mode, thee-phase mode, 120Vac. 60 Hz. Program all
three-phase outputs to the same voltage.
For best results, the output of all amplifiers should be loaded to at least 80% of full scale voltage current
on all phases at the same time. This requires a three-phase load. If no such load is available, perform this
calibration with no load.
Proceed as follows:
1. Program AC mode, 3 phase, low voltage range, 120Vac, 50 or 60 Hz. Close output relay.
2. Select the OUTPUT CAL screen.
3. Connect phase meter between phase A and B outputs.
4. Use the PHASE key to select phase B in the upper right corner of the CAL screen.
5. Close output relay and measure the phase angle between phase A and Phase B.
6. Adjust PHASE OFST cal coefficient up or down and press ENTER key until phase B offset is
240° ± 0.5° or better.
7. Connect phase meter between phase A and C outputs.
8. Use PHASE key to select phase C in the upper right corner of the CAL screen.
9. Adjust PHASE OFST cal coefficient up or down and press ENTER key until phase C offset is
120° ± 0.5° or better.
7.4.4 Output Calibration Summary
The following Table is a summary of the preceding calibration steps. Program the following values in the
table and make the adjustments in the OUTPUT CALIBRATION screen. Select the phase to be calibrated
by pressing the PHASE key.
CALIBRATION PROGRAM VALUES CALIBRATION VALUE ADJUST TO
300 VAC range DC Zero 300 VAC range, 0.0 V,
60 Hz VOLT ZERO 0 ± 5 mV DC
300 VAC range High Freq DC
Zero, -HF models only. 300 VAC range, 0.0 V,
820 Hz VOLT ZERO 0 ± 5 mV DC
300 VAC range Volt FS 240.0 V, 60 Hz VOLT FS 240
 0.05 VAC
Phase Offset B, C 150 VAC range, 120V,
60 Hz PHASE OFST ± 0.5 °
Table 7-3: Output Calibration Table – BPS Series