Constant Torque Control Mode / Manual Torque Boost - Hitachi WJ200 Instruction Manual

CONSTANT TORQUE CONTROL MODE / MANUAL TORQUE BOOST

Manual Torque Boost – The Constant and Variable Torque algorithms feature an adjustable torque boost curve. When the motor
load has a lot of inertia or starting friction, you may need to increase the low frequency starting torque characteristics by boosting
the voltage above the normal V/f ratio (shown below). The function attempts to compensate for voltage drop in the motor primary
winding in the low-speed range. The boost is applied from zero to the base frequency. You set the breakpoint of the boost (point A
on the graph) by using parameters A042 and A043. The manual boost is calculated as an addition to the standard V/f curve.
Function
Torque Boost Function
Torque Boost Value
Torque Boost Break Point
VFD Torque Control Mode
Parameter
A041
A042
A043
A044
Value
00 = Manual
0.0 – 20.0
0.0 – 50.0
00: Constant Torque
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