Specifications

LA Series Linear Servo Amplifier Technical Reference Manual
28
11.2 Manual Balance
The procedure to manually balance the phases is shown below. A voltmeter is required to measure the
phase voltages. Refer to Figure 2 on the next page for the location of the balance pots.
The procedure to manually balance the phases:
1) With power off, connect the Phase A motor lead to J5-1. Connect Phase B motor lead to J5-4
(Common). Leave Phase C motor lead disconnected.
2) Apply power to the system.
3) Set the motor so no motion is possible (lock down or tape stage).
4) Set the command input to 0 volts and Enable the amplifier.
5) With a multi-meter set on the 2 VDC range, measure across the load (J5-1 to J5-4). Adjust
potentiometer RV6, BAL A, until the meter reads 0.00 VDC.
6) Move the Phase A lead to J5-2 (Phase B). This puts the load from Phase B to common.
7) With a multi-meter set on the 2 VDC range, measure across the load (J5-2 to J5-4). Adjust
potentiometer RV5, BAL B, until the meter reads 0.00 VDC.
8) Reconnect the motor leads normally: Phase A motor lead to J5-1, Phase B motor lead to J5-2,
Phase C motor lead to J5-3.
9) With a multi-meter set on the 2 VDC range, measure across Phase C to common (J5-3 to J5-4).
Adjust potentiometer RV5, BAL C, until the meter reads 0.00 VDC.