ALL-TEST PRO AT31 - Phase Balance Test Procedure

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ALL-TEST PRO

31 User Manual

3. Turn the motor shaft until the highest impedance value is obtained.

4. Press the ZERO key again. This sets the reference phase (T1-T3) to “0”. Enter 0 on the Motor

Test Form

5. Move the Test leads to T2 & T3. This determines the Impedance Phase Balance or Unbalance

Referenced to (T1-T3).

6. Turn the shaft slowly until the lowest percentage value is obtained. (The percentage should be

less than 3% of phase unbalance. A percentage > 5% indicates a fault in the winding and

should be investigated further).

ALL-TEST PRO AT31 - Phase Balance Test Procedure - Steps 3-4