WEG CFW501 V1.8X Programming Manual page 83

P0138 – Slip Compensation
Adjustable -10.0 % to 10.0 %
Range:
Properties: V/f
Access groups MOTOR
via HMI:
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
9.5: Slip compensation in an operation point of the standar V/f curve on page
of V/f scale control on page 9-2
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
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.
Output
voltage (%)
P0142
P0143
P0144
P0136
Figure 9.5: Slip compensation in an operation point of the standar V/f curve
this compensation is represented in the variable f
Figure 9.5: Slip compensation in an operation point of the standar V/f curve on
Δv
V/f Scalar Control
Factory
Setting:
9-7. In Figure 9.1: Block diagram
.
Slip
P
4
P0145 P0134 Output speed
(rpm)
P0146
P0147
0.0 %
Figure
9
CFW501 | 9-7