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CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
Range
[Factory Setting]
Parameter
Description / Notes
Figure 6.7 - Block diagram of the automatic torque boost function
Figure 6.8 - V/F curve with automatic torque boost
(automatic IxR compensation )
P138
0.0 to 10.0%
Slip
[ 0.0 ]
Compensation
0.1%
The parameter P138 is used in the motor slip
compensation function.
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.
Speed
Reference (F*)
Active Output
Current (I
a
)
Filter
IxR
Automatic
P137
IxR
P136
P007
Motor
voltage
Compensation
Zone
Maximum
(P142)
Output Voltage
Output
Frequency
Field Weakening
(P145)
4Hz
0
0,3xP137xP142
Slip
Compensation
Active Output
Current (I
a
)
Frequency
Reference (F*)
Ramp Input
Frequency (Fe)
F
Filter
P138
Figure 6.9 - Block diagram of the slip compensation function
