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IMPULSE
®
•G+ Mini Technical Manual
November 2020
Page 81
5.3.3 Torque Compensation
The motor torque requirement changes according to load conditions. Full-range automatic torque boost adjusts the
voltage of the V/f pattern according to the required torque. The IMPULSE
®
•G+ Mini automatically adjusts the
voltage during constant-speed operation as well as during acceleration.
.
Figure 5-23: Torque Characteristics
The required torque is calculated by the VFD. This ensures trip-less operation and power savings.
Output voltage
α
Torque compensation gain x Required torque
When more torque is needed, increase the torque compensation gain in one-tenth (0.1) increments. Increase the
setting when the wiring distance between the VFD and the motor is 100ft. or longer. If the motor generates
excessive vibration or oscillates, decrease the torque compensation.
Increasing torque compensation gain increases motor torque, but an excessive increase may cause the following:
•
VFD fault trips due to motor overexcitation and/or
•
Motor overheat or excessive vibration
Increase the torque compensation time constant in 10ms increments when the motor’s output current is unstable.
Decrease this value when speed response is slow.
* See N02.05 for the setting D03.02 (
) OLV Stabilization Level
NOTE:
D03.02 is read only if N02.05 is not equal to FF.
Parameter
Name
Function
Range
Default
Control
Method
D03.01
Torque Compensation Gain
Torque compensation multiplier.
0.00–2.50
1.00
V/f or OLV
D03.02
Torque Compensation Time
Torque compensation time.
0.00–10000 ms
60 (OLV)*
200 (V/f)
V/f or OLV
D03.03
Forward Torque
Compensation @ Start
FWD compensation at start.
0.0–200%
0.0
OLV
D03.04
Reverse Torque
Compensation @ Start
REV compensation at start.
-200–0.0%
0.0
OLV
D03.05
Torque Compensation Delay
Time
Torque compensation delay time at
start (disabled if 4 ms or less)
0–200 ms
10ms
OLV
D03.06
Torque Compensation Delay
Time 2
Starting Torque Start-Up Time (ms)
0–10000 ms
150
OLV
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