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5 Basic Settings
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
5-11 Torque Boost Function Settings
5
5-11-1 Torque Boost
• The manual torque boost function sets the starting voltage for the output voltage of the inverter.
The automatic torque boost function starts the adjustment of the output voltage and the output
frequency from the value set in the manual torque boost function.
• When the automatic torque boost function is enabled, normally it is not necessary to adjust the
manual torque boost function.
Adjust it when the automatic torque boost function is disabled or if the motor stalls at low speeds.
• Set the 1st/2nd/3rd Manual Torque Boost Frequency (A043/A243/A343) appropriate to the rotation
speed that provides the required output torque.
While observing the movement of the load, adjust the 1st/2nd/3rd Manual Torque Boost Voltage
(A042/A242/A342) at which the motor speed does not decrease. Check the output current of the
inverter and adjust it to 150% of the rated current of the motor or less.
• Set A042/A242/A342 as 100% of the Motor Rated Voltage Selection (A082) value.
The set data is defined as a voltage equivalent to V/f characteristics at 0 Hz.
• Set A043/A243/A343 as 100% of the 1st/2nd/3rd Base Frequency (A003/A203/A303) value.
• Setting the manual torque boost voltage data too high may cause motor overexcitation. Although an
overexcited motor can still produce torque output, it is inefficient and causes overload or overcurrent
conditions easily. Check the output current of the inverter and adjust it to 150% of the rated current of
the motor or less.
Manual Torque Boost
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