User Manual – Rev BE AMETEK Programmable Power
MX Series 220
6.4.6 Three Phase Mode
As indicated earlier, for 3-Phase power system, 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.
For the MX45-3Pi operating in single-phase mode, the output voltage calibration
does not have be repeated in single phase mode as the same coefficients for
phase A are used in either phase mode.
6.4.7 Phase Angle Calibration
Output phase angle calibration is required only on MX 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 if 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.
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