SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
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Chapter 4 Explanation of Functions<br />
(2) Automatic torque boost<br />
When automatic torque boost (data "01") is selected by the torque boost selection (A041/A241), the<br />
inverter automatically adjusts the output frequency and voltage according to the load on the motor.<br />
(During actual operation, the automatic torque boost is usually combined with the manual torque boost.)<br />
When you select the automatic torque boost, adjust the settings of the motor capacity selection<br />
(H003/H203) and motor pole selection (H004/H204) according to the motor to be driven.<br />
If the inverter trips due to overcurrent during motor deceleration, set the AVR function select (A081) to<br />
always enable the AVR function (data "00").<br />
If you cannot obtain the desired operation characteristic by using the automatic torque boost, make the<br />
following adjustments:<br />
Symptom Adjustment method Adjustment item<br />
(1) Increase the voltage setting for manual torque boost<br />
A042/A242<br />
step by step.<br />
Motor torque is insufficient at low<br />
(2) Increase the slippage compensation gain for<br />
speed.<br />
A047/A247<br />
automatic torque boost step by step.<br />
(The motor does not rotate at low<br />
(3) Increase the voltage compensation gain for<br />
speed.)<br />
A046/A246<br />
automatic torque boost step by step.<br />
(4) Reduce the carrier frequency setting. b083<br />
The motor speed falls when a load Increase the slippage compensation gain for the<br />
is applied to the motor.<br />
automatic torque boost step by step.<br />
A047/A247<br />
The motor speed increases when a Reduce the slippage compensation gain for the<br />
load is applied to the motor. automatic torque boost step by step.<br />
A047/A247<br />
(1) Reduce the voltage compensation gain for the<br />
automatic torque boost step by step.<br />
A046/A246<br />
The inverter trips due to overcurrent (2) Reduce the slippage compensation gain for the<br />
when a load is applied to the motor. automatic torque boost step by step.<br />
A047/A247<br />
(3) Reduce the voltage setting for the manual torque<br />
boost step by step.<br />
A042/A242<br />
This function cannot be selection for 3rd moter setting.<br />
<strong>Manual</strong> torque boost valid.<br />
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