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Motor Measurement (Motor Analysis-Equipped Model)
Measuring the electric angle of the motor
When a pulse signal is used as rotation signal input, you can view changes in the voltage and
current phase using the pulse as the reference by setting the [Sync. source] for input channels 1
to 8 to [Ext1], [Ext1], [Ext2], [Ext3], or [Ext4].
Fundamental wave
frequency (U1)
Calculation period
Phase dierence
External sync. signal
Reference Reference
External sync. signal
Fundamental wave
frequency (U1)
Calculation period
Reference Reference
When measuring the electrical angle using multiple pulses
• It is recommended to use the origin signal (Z-phase). When the origin signal (Z-phase) is used,
the reference pulse is determined based on the origin signal, enabling phase measurement using
a xed pulse as the reference at all times.
• To use a rising edge of the origin signal (Z-phase) as the reference, set the Z-phase reference to
Rising; to use a falling edge, set to Falling.
• When the origin signal (Z-phase) is not used, the pulse that serves as the reference is determined
during synchronization. If synchronization is fails, a dierent pulse may be used as the reference
each time resynchronization is performed.
• Performing harmonic analysis in synchronization with the inputted rotation signal pulse requires
pulses, the number of which is a whole number multiple of the input frequency. For example, a
four-pole motor would require pulses, the number of which is a whole number multiple of 2, while
a six-pole motor would require pulses, the number of which is a whole number multiple of 3.
• When measuring a motor that uses a Y connection internally in 3P3W3M wiring mode, phase
angles of the phase voltage and phase current can be measured by using the
Δ
–Y conversion
function.
Displaying Power Numerically
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