5-14
IM WT5000-01EN
Sync Speed(Sync Speed)
Motor Poles (Pole)
Set the number of motor poles to a value from 1 to 99. This number is used to compute the sync speed.
Frequency Measurement Source (Source)
• Select the frequency measurement source to use to compute the sync speed from the options below. This
number is used to compute the sync speed. The available options vary depending on the installed elements.
U1, I1, U2, I2, U3, I3, U4, I4, U5, I5, U6, I6, U7, I7
• Normally, you should select the voltage or current that is being applied to the motor. If you select the
frequency of a voltage or current that is not being applied to the motor, the sync speed may not be determined
properly.
Sync Speed Equation
The sync speed unit is fixed at min
–1
or rpm.
120×Fs
Pole
Sync speed (min
−
1
) =
Fs: The frequency of the frequency measurement source (Hz)
Pole: The number of motor poles
Slip Equation
The sync speed unit is fixed at min
–1
or rpm. To determine the slip, configure the rotating speed
so
that the unit of the rotating speed is also min
–1
(or rpm).
Slip (%) =
×100
SyncSp
−
Speed
SyncSp
SyncSp: The synchronous speed (min
–1
)
Speed: The rotating speed (min
–1
)
Set the frequency measurement source to a stable voltage or current signal that is being applied to the motor
and that has low distortion and noise.
5 Motor Evaluation and Auxiliary Input (Option)
