V/F Control [23] - WEG CFW-11 Programming Manual

Scalar Control (V/f)

9.1 V/F CONTROL [23]

P0136 – Manual Torque Boost
Adjustable
Range:
Properties:
Access groups
via HMI:
Description:
It acts at low speeds, increasing the inverter output voltage in order to compensate the voltage drop across the
motor stator resistance, with the purpose of keeping the torque constant.
The optimum setting is the lowest value of P0136 that allows a satisfactory starting of the motor. Values higher than
the necessary will increase the motor current at low speeds, being able to lead the inverter to a fault (F048, F051,
F071, F072, F078 or F183) or alarm (A046, A047, A050 or A110) condition.
NOTE!
For large frames than frame C, the standard value is 0. For others, the standard value is 1.
P0137 – Automatic Torque Boost
Adjustable
Range:
Properties:
Access groups
via HMI:
Description:
The Automatic Torque Boost compensates the voltage drop on the stator resistance in function of the motor active
9
current.
The criteria for adjusting P0137 are the same as for the parameter P0136.
9-2
0 to 9
V/f
01 PARAMETER GROUPS
23 V/f Control
Output Voltage
Nominal
1/2 Nominal
P0136=9
Figure 9.2 - Effect of P0136 on the V/f curve (P0202=0 or 1)
0.00 to 1.00
V/f
01 PARAMETER GROUPS
23 V/f Control
P0136=0
N
N
nom/2
nom
Factory According
Setting: to inverter
model
Speed
Factory 0.00
Setting: