WEG CFW-09 User Manual page 129

CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
[Factory Setting]
Parameter
P137
Automatic Torque
Boost
This parame-
ter is shown on the
display(s) only when
P202 = 0, 1 or 2
(V/F Control)
P138 -10.0 to +10.0 %
Slip Compensation
This parameter
is shown on the
display(s) only when
P202 = 0, 1 or 2
(V/F Control)
130
Range
Unit Description / Notes
The automatic Torque Boost compensates for the voltage drop in the
0.00 to 1.00
stator resistance as a function of the motor active current.
[ 0.00 ]
0.01
The criteria for setting P137 are the same as for the parameter P136.
Reference
Output
Active
Current
P138 (for values between 0.0 % and +10.0 %) is used in the Motor Slip
Compensation output frequency function, which compensates for the
[ 0.0 ]
speed drop as the load increases.
0.1 %
P138 allows the user to set the VSD for more accurate slip compensation.
Once set up P138 will compensate for speed variations due to load by
automatically adjusting both voltage and frequency.
Total Reference
(Refer to figures 6.26 and 6.27b))
Active
Output
Current
Torque Boost
Speed
P136
Automatic
Torque Boost
P137
P139
Figure 6.6 - Block diagram P137
Output Voltage
Nominal
1/2 Nominal
Boost
Zone
1/2 Nom
Figure 6.7 - V/F curve with automatic torque boost
Compensation
P139
Figure 6.8 - Block diagram P138
P007
Speed
Nominal
F
Slip
P138
Motor
Voltage
Speed