4.8 Viewing Motor Measurement Values (Model PW3390-03 only)
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Chapter 4 Viewing Measurement Values
Press and then to correct (zero) any phase difference between the rotation signal input
pulse and U1 fundamental content.
Electrical Angle Measurement Example
Phase Zero Adjustment (PHASE ADJ)
• Phase zero adjustment is available only when CH B is set for pulse input and [Harm sync
src] is set to [Ext]. Otherwise, performing this key operation has no effect.
• When harmonic synchronization is unlocked, this key operation has no effect.
• Press and then to clear the correction value.
1. Without providing current to a motor, rotate it from the load side while measuring the voltage induced
at its input terminals.
2. Perform phase zero adjustment.
(Zero out any phase difference between the fundamental waveform of the induced voltage input as
U1 and the pulse signal.)
3. Without providing current to a motor, rotate it from the load side while measuring the voltage induced
at its input terminals.
Apply current to rotate the motor.
(The voltage-current phase angle measured by the instrument is the electrical angle based on the
induced voltage phase.)
Phase difference is affected by the rotation input signal pulse waveform and the instrument’s
internal circuit delay, which cause measurement errors when measuring frequencies much dif-
ferent from that at which phase zero adjustment was performed.
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