Constant Torque Control Mode / Automatic Torque Boost; Fine Tuning Automatic Torque Boost - Hitachi WJ200 Instruction Manual

CONSTANT TORQUE CONTROL MODE / AUTOMATIC TORQUE BOOST

In constant torque using automatic torque boost the starting torque boost value and frequency break point are used as starting
points for automatic torque boost. Voltage compensation gain and slip compensation gain are used for fine tuning adjustments.
Using parameters A046 and A047, you can obtain better performance under automatic torque boost mode (A041=01). See following
table for the concept of adjustment, including other parameters.
Function
Torque Boost Function
Torque Boost Value
Torque Boost Break Point
VFD Torque Control Mode
Voltage Compensation Gain
Slip Compensation Gain

FINE TUNING AUTOMATIC TORQUE BOOST

Symptom
Motor torque is not enough at low speed
(The motor does not rotate at low speed)
Motor speed decreases (stalls) when a load is
given to the motor
Motor speed increases when a load is given to
the motor
The inverter trips due to overcurrent when a
load is given to the motor
Parameter
A041
A042
A043
A044
A046
A047
Adjustment
Increase the voltage setting for manual torque boost,
step by step
Increase the voltage compensation gain for automatic
torque boost, step by step
Increase the slip compensation gain for automatic
torque boost, step by step
Reduce carrier frequency
Increase the slip compensation gain for automatic
torque boost, step by step
Decrease the slip compensation gain for automatic
torque boost, step by step
Decrease the voltage setting for manual torque boost,
step by step
Decrease the voltage compensation gain for automatic
torque boost, step by step
Decrease the slip compensation gain for automatic
torque boost, step by step
Value
01 = Automatic
0.0 – 20.0
0.0 – 50.0
00: Constant Torque
0 – 255
0 – 255
Parameter
A042
A046
A047
b083
A047
A047
A042
A046
A047
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