E6582233
E-23
5
7) The maximum length of wires between the inverter and motor is 30 meters. If the wires are longer than 30
meters, set standard auto-tuning with the wires connected to improve low-speed torque during sensorless
vector control.
However the effects of voltage drop cause motor-generated torque in the vicinity of rated frequency to be
somewhat lower.
8) When a reactor is connected between the inverter and a motor, the motor's generated torque may fall.
Setting auto-tuning may also cause a trip (
) rendering sensorless vector control unusable.
5.12 Manual torque boost - increasing torque boost at low
speeds
: Torque boost 1
Function
If torque is inadequate at low speeds, increase torque by raising the torque boost rate with this
parameter.
O
u
tput
v
o
lt
a
g
e
[V
]/
(%
)
Base frequency voltage
Output frequency (Hz)
Base frequency
[Parameter setting]
Title Function
Adjustment range
Default setting
Torque boost value 1
0.0 - 30.0 (%)
According to model
(Refer to section 10.4)
★
Valid when
is set to
0
(V/F constant) or
1
(square reduction)
Note 1: The optimum value is programmed for each inverter capacity. Be careful not to increase the torque boost
rate too much because it could cause an overcurrent trip at startup.
