9
Scalar Control (V/f)
CFW700 | 9-3
Description:
The Automatic Torque Boost compensates the voltage drop on the stator resistance in function of the motor
active current.
The criteria for adjusting P0137 are the same as for the parameter P0136.
P0136
I x R
P0137
Automatic
I x R
Voltage
Applied to
the Motor
P0007
P0139
Active Output
Current
Speed Reference
Figure 9.3:
Torque Boost block diagram
Output Voltage
Nominal
1/2 Nominal
Compensation
Zone
N
nom/2
N
nom
Speed
Figure 9.4:
Effect of P0137 on the V/f curve (P0202=0…2)
P0138 – Slip Compensation
Adjustable
Range:
-10.0 to +10.0 %
Factory
Setting:
0.0 %
Properties:
V/f
Access groups
via HMI:
Description:
The parameter P0138 is used in the motor slip compensation function, when adjusted to positive values. In this
case it compensates the drop in the speed due to the application of load to the motor shaft. It increases the
output frequency in function of the increase in the motor active current.
The setting of P0138 allows regulating the slip compensation precisely. Once P0138 is adjusted the inverter will
keep the speed constant even with load variations by adjusting the voltage and frequency automatically.
Negative values are used in special applications where one wants to reduce the output speed in function of the
increase in the motor current.
E.g.: Load distribution in motors operated in parallel.
Summary of Contents for CFW700
Page 2: ......
Page 4: ......
Page 8: ...Summary...
Page 34: ...2 General Information 2 4 CFW700...
Page 38: ...3 About the CFW700 3 4 CFW700...
Page 56: ...7 Starting up and Settings 7 4 CFW700...
Page 58: ...8 Available Control Types 8 2 CFW700...
Page 78: ...10 VVW Control 10 8 CFW700...
Page 158: ...13 Digital and Analog Inputs and Outputs 13 28 CFW700...
