WEG CFW100 Programming Manual page 62

V/f Scalar Control
Output
active
current
P138 – Slip Compensation
Adjustable
Range:
Properties:
Description:
Parameter P138 is used in the motor slip compensation function, when set for positive values. In this case, it
compensates the speed drop due to the application of load on the shaft and, consequently, the slip. Thus, it
increments the output frequency (Δf) considering the increase of the motor active current, as shown in
9.7 on page 9-6. In
The setting in P138 allows regulating with good accuracy the slip compensation by moving the operation
point on the V/f curve, as shown in
frequency constant even with load variations.
9
Negative values are used in special applications where you wish to reduce the output frequency considering
the increase of the motor current.
Eg.: load distribution in motors driven in parallel.
9-6 | CFW100
Frequency reference
P139
Figure 9.6: Block diagram of the automatic torque boost
-10.0 to 10.0 %
V/f
Figure 9.1 on page 9-2 this compensation is represented in the variable f
Figure 9.7 on page
Output
voltage (%)
P142
P143
P136
Δf
Figure 9.7: Slip compensation in an operation point of the standar V/f curve
I x R
P136
I x R
automatic
P137
9-6. Once P138 is set, the inverter is able to keep the
P146
P145 P134
Return Advance
P007
Voltage
applied on
the motor
Factory 0.0 %
Setting:
.
Slip
Output
frequency(Hz)
Figure