Hitachi SJ Series, User Manual

Page: 226 / 786

12-9-9
Chapter 12 Inverter Function
12.9.7 Automatically adjust torque
• To improve the delayed start of the motor from the
start of the operation.
• A heavy load slows the motor revolution relative to
what the frequency command dictates.
• Automatically adjust the frequency and the output
voltage so as to achieve a higher torque.
• The automatic boost corrects the frequency and
the output in order to control the motor. Accordingly,
it requires the acquisition of the motor constant by
means of auto-tuning or the like.
Parameter
• When a motor is hunting and vibrating, an
adjustment of the stability constant [HA110] may
improve the state of the motor.
• In the automatic torque boost, set the motor
capacity appropriately, the number of motor poles,
the base frequency, the rated voltage, and the
rated current in order to conduct motor control.
• When the motor performs below its potential
characteristics, conduct the auto-tuning and make
adjustment by referring to the next section.
Item Parameter Data Description
Control mode [AA121] 03 To use the automatic torque boost (IM).
Stability constant [HA110] 0~1000(%)
To adjust the control for reducing the
hunting of motors.
Base frequency [Hb104]
10.00 to the maximum
frequency (Hz)
To set the base frequency of motors.
Maximum frequency [Hb105]
Base frequency to 590.00
(Hz)
To set the maximum frequency of
motors.
Motor's rated voltage [Hb106] 1~1000 (V) Set the rated voltage of motors.
Automatic torque
boost voltage
compensation gain
[HC101] 0~255
To adjust the amount of the voltage
added by the automatic torque boost.
Automatic torque
boost
Slip compensation
gain
[HC102] 0~255
To adjust the amount of the frequency
added by the automatic torque boost.
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