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Chapter 4 Explanation of Functions
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(2) Automatic torque boost
When automatic torque boost (data "01") is selected by the torque boost selection (A041/A241), the
inverter automatically adjusts the output frequency and voltage according to the load on the motor.
(During actual operation, the automatic torque boost is usually combined with the manual torque boost.)
When you select the automatic torque boost, adjust the settings of the motor capacity selection
(H003/H203) and motor pole selection (H004/H204) according to the motor to be driven.
If the inverter trips due to overcurrent during motor deceleration, set the AVR function select (A081) to
always enable the AVR function (data "00").
If you cannot obtain the desired operation characteristic by using the automatic torque boost, make the
following adjustments:
Symptom Adjustment method Adjustment item
(1) Increase the voltage setting for manual torque boost
step by step.
A042/A242
(2) Increase the slippage compensation gain for
automatic torque boost step by step.
A047/A247
(3) Increase the voltage compensation gain for
automatic torque boost step by step.
A046/A246
Motor torque is insufficient at low
speed.
(The motor does not rotate at low
speed.)
(4) Reduce the carrier frequency setting. b083
The motor speed falls when a load
is applied to the motor.
Increase the slippage compensation gain for the
automatic torque boost step by step.
A047/A247
The motor speed increases when a
load is applied to the motor.
Reduce the slippage compensation gain for the
automatic torque boost step by step.
A047/A247
(1) Reduce the voltage compensation gain for the
automatic torque boost step by step.
A046/A246
(2) Reduce the slippage compensation gain for the
automatic torque boost step by step.
A047/A247
The inverter trips due to overcurrent
when a load is applied to the motor.
(3) Reduce the voltage setting for the manual torque
boost step by step.
A042/A242
This function cannot be selection for 3rd moter setting.
Manual torque boost valid.