WEG CFW-10 EASYDRIVE User Manual page 61

[Factory Setting]
Parameter
P138
Slip
Compensation
CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
Range
Active Output
Current (I
Figure 6.7 - Block diagram of the automatic torque boost function
The parameter P138 is used in the motor slip
0.0 to 10.0%
compensation function.
[ 0.0 ]
0.1%
This function compensates the drop of the motor speed
due to load, which is a inherent characteristic relating to
the operation principle of the induction motor.
This speed drop is compensated by increasing the output
frequency (applied to the motor) as a function of the
increase of the active motor current, as shown in the block
diagram and in the V/F curve below.
Active Output
Current (I
Figure 6.9 - Block diagram of the slip compensation function
Description / Notes
Speed
Reference (F*)
)
a
Filter
Output Voltage
Maximum
(P142)
0,3xP137xP142
Compensation
Zone
0
4Hz
Figure 6.8 - V/F curve with automatic torque boost
(automatic IxR compensation )
Frequency
Reference (F*)
)
a
Filter
IxR
P136
IxR
Automatic
P137
Field Weakening
(P145)
Slip
F
Compensation
P138
P007
Motor
voltage
Output
Frequency
Ramp Input
Frequency (Fe)
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