Yaskawa VS-616G5 Series Revision F Programming Manual - Manual (Page 37)

VS-616G5 Programming Manual 37
V/f V/f w/PG Open Loop
Vector
Flux
Vector
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
Setting Range: 0 to 10000ms
Factory Default: 20ms
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.
Setting Range: 0.0 to 200.0%
Factory Default: 0.0
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.
C4-02 Torque Compensation Time Constant Torq Comp Time A A A -
C4-03 Forward Torque Compensation Value at Start
<1110>
F TorqCmp @ start - - A -
Required torque ⇒ Increase voltage
Frequency
Voltage
Figure 18 Torque Characteristics
Section C: Tuning Parameters
C4 Torque Compensation