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Chapter 4
4.2.18 Torque boost setting
The torque boost setting function allows you to compensate for the
voltage drop due to wiring and the primary resistance of the motor
so as to improve the motor torque at low speeds.
When you select automatic torque boost by the torque boost
selection (A041/A241), adjust the settings of the motor capacity
selection (H003/H203) and motor pole selection (H004/H204)
based on the motor to be driven.
Item
Torque boost selection
Manual torque boost value
Manual torque boost frequency
adjustment
Motor capacity
Motor poles setting
Voltage compensation gain
setting for automatic torque
boost
Slippage compensation gain
setting for automatic torque
boost
(1) Automatic torque boost
The inverter outputs the voltage according to the settings of the manual torque boost (A042/A242/A342) and manual
torque boost frequency adjustment (A043/A243/A343).
Use the manual torque boost value (A042/A242/A342) to specify the rate of the boost to the voltage (100%) set by the
AVR voltage select.
The set rate of voltage corresponds to the boost voltage that is output when the output frequency is 0 Hz.
When increasing the value of the manual torque boost value, be careful to prevent motor over-excitation.
Over-excitation may result in motor burnout.
Use the manual torque boost frequency adjustment (A043/A243/A343) to specify the rate of the frequency at each
breakpoint to the base frequency (100%).
To switch the settings among the 1st, 2nd, and 3rd settings ("A041 to A043", "A241 to A243", and "A342 and A343"),
assign function "08" (SET) and "17" (SET3) to intelligent input terminals. Use the SET and SET3 signals for switching.
Output voltage (%)
A042/A242/A342
Function code
Data or range of data
A041/A241
A042/A242/A342
0.0 to 20.0(%)
A043/A243/A343
0.0 to 50.0(%)
H003/H203
0.20 to 75.0(kW)
H004/H204
2, 4, 6, 8, or 10 (poles)
A046/A246
A047/A247
100
Base frequency
A043/A243/A343
(100%)
4-18
Explanation of Functions
A041/A241: Torque boost selection, 1st/2nd motors
A042/A242/A342: Manual torque boost value,
1st/2nd3rd motors
A043/A243/A343: Manual torque boost frequency
adjustment, 1st/2nd/3rd motors
H003/H203: Motor capacity, 1st/2nd motors
H004/H204: Motor poles setting, 1st/2nd motors
00
Manual torque boost
01
Automatic torque boost
Setting of the rate of the boost to the
output voltage (100%)
Setting of the rate of the frequency at
breakpoint to the base frequency
Selection of the motor capacity
Selection of the number of poles of the
motor
See Item (2), "Automatic torque
0. to 255.
boost."
See Item (2), "Automatic torque
0. to 255.
boost."
Output
frequency
Related code
Description
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