WEG CFW501 V1.8X, Programming Manual, Page: 83 / 192

V/f Scalar Control
CFW501 | 9-7
9
P0138 – Slip Compensation
Adjustable
Range:
-10.0 % to 10.0 %
Factory
Setting:
0.0 %
Properties: V/f
Access groups
via HMI:
MOTOR
Description:
Parameter P0138 is used in the motor slip compensation function, when set for positive values. In this case, it
compensates the speed drop due to application of the load on the shaft and, consequently, the slip. In this way,
it increments the output frequency (Δv) considering the increase of the motor active current as shown in
Figure
9.5: Slip compensation in an operation point of the standar V/f curve on page 9-7 . In Figure 9.1: Block diagram
of V/f scale control on page 9-2 this compensation is represented in the variable f
Slip
.
The setting in P0138 allows regulating with good accuracy the slip compensation by moving the operation point
on the V/f curve, as shown in
Figure 9.5: Slip compensation in an operation point of the standar V/f curve on
page 9-7 . Once P0138 is set, the inverter is able to keep the speed constant even with load variations.
Negative values are used in special applications where you wish to reduce the output speed considering the
increase of the motor current.
E.g.: load distribution in motors driven in parallel.
P0134 P0145
P0146
P0147
P
4
P0142
P0143
P0144
P0136
Output speed
(rpm)
Output
voltage (%)
Δ v
Figure 9.5: Slip compensation in an operation point of the standar V/f curve