YOKOGAWA WT3002E - Page 31

1-23
IM WT3001E-51EN
Motor Evaluation Function (Option)
1
2
3
4
5
6
7
8
9
10
11
12
13
Index
• Equation for Deriving the Slip
The unit of synchronous speed is fixed to min
–1
(or rpm). Therefore, to determine the
slip, set the scaling coefficient of the rotating speed (see section 1.7) so that the unit
of rotating speed s also min
–1
(or rpm).
× 100
Synchronous speed (min
–1
) – rotating speed*(min
–1
)
Rotating speed (min
–1
)
Slip (%) =
* Rotating speed derived in section 1.6.
Note
Please select a stable voltage or current (supplied by the motor) with small distortion or noise
for the frequency measurement source.
1.8 Setting the Motor and Frequency Measurement Source for Computing the Sync Speed and Slip