WEG CFW501 V1.8X Programming Manual page 82

V/f Scalar Control
P0137 – Automatic Torque Boost
Adjustable
Range:
Properties:
Access groups
via HMI:
Description:
The automatic torque boost compensates the voltage drop in the stator resistance because of active current.
Look at Figure 9.1: Block diagram of V/f scale control on page
automatic torque boost action on the modulation index defined by V/f curve.
P0137 actuates similarly to P0136, but the value set is applied proportionally to the output active current in
relation to the maximum current (2xP0295).
The setting criteria of P0137 are the same as those of P0136, that is, set the value as low as possible for the
motor start and operation at low frequencies, because values above those increase the losses, heating and
overload of the motor and inverter.
The block diagram of
automatic compensation action IxR responsible for the increment of the voltage in the ramp output according
to the increase of the active current.
9
Output
active
current
9-6 | CFW501
0.0 to 30.0 %
V/f
MOTOR
Figure 9.4: Block diagram of the automatic torque boost on page 9-6
Speed reference
P0139
Figure 9.4: Block diagram of the automatic torque boost
9-2, where variable m
I x R
P0136
I x R
Automatic
P0137
Factory 0.0 %
Setting:
corresponds to the
IxR
shows the
P0007
Voltage
applied on
motor