YASKAWA VS-616G5 Series Programming Manual page 37

Output voltage ∝ Torque compensation gain × Required torque
Normally, no adjustment is necessary for torque compensation gain. When more torque is needed,
increase the torque compensation gain in one tenth (0.1) increments. When the wiring distance
between the inverter and the motor is long, or when the motor generates excessive vibration, decrease
the torque compensation gain.
Increasing torque compensation gain increases motor torque, but an excessive increase may cause the
following:
· Inverter fault trips due to motor overexcitation
· Motor overheat or excessive vibration
C4-02 Torque Compensation Time Constant
Setting Range:
Factory Default:
Increase the torque compensation time constant in 10ms increments when the motor output current is
unstable, and decrease this value when speed response is slow.
Note: When A1-02=2 [Open Loop Vector] the factory default setting is 20 ms. When A1-02=1or 3
[V/F or V/F w/PG] factory default setting is 200 ms.
C4-03 Forward Torque Compensation Value at Start
Setting Range:
Factory Default:
This parameter may improve the motor performance during start. This feature functions only when
starting a motor. Torque reference and motor flux can be ramped up quickly to improve speed
response during start. A setting of 0.0 disables this feature.
VS-616G5 Programming Manual
Voltage
Required torque ⇒ Increase voltage
Figure 18 Torque Characteristics
0 to 10000ms
20ms
0.0 to 200.0%
0.0
Frequency
Torq Comp Time
F TorqCmp @ start
<1110>
Section C: Tuning Parameters
C4 Torque Compensation
Open Loop Flux
V/f V/f w/PG
Vector Vector
A A A -
- - A -
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