Manual Torque Boost-Increasing Torque Boost At Low Speeds; Base Frequency - Toshiba TOSVERT VF-AS1 Instruction Manual

5.7 Manual torque boost–increasing torque boost at low speeds

• Function
If torque is inadequate at low speeds, increase torque by raising the torque boost rate with this parameter.
Base frequency voltage 1
[Parameter setting]
Title

This parameter is valid when = (Constant torque characteristics),  (square reduction torque),  (V/f 5-point setting).
Note: The optimum value is programmed for each inverter capacity. Boosting torque excessively may cause the
5
inverter to trip because of an overcurrent. If operation is repeated with torque boosted excessively, electronic
devices in the main circuit may be damaged, so if high starting torque is needed, it is recommendable to use
vector control.
⇒ Refer to 5.6 selection 3) and 4).
If necessary, set the amount of torque to be boosted, as a guide, within +2% of the factory default setting.
5.8

Base frequency



• Function
Sets the base frequency and the base frequency voltage in conformance with load specifications or the motor's
rated frequency.
Note: This is an important parameter that determines the constant torque control area.
[Parameter setting]
Title
Base

frequency 1
Base
frequency

voltage 1
Note: The output frequency is limited to a frequency 10.5 times as high as the base frequency (). Even if the
maximum frequency () or the upper limit frequency () is set above this frequency, this limitation is
imposed on the output frequency.
: Manual torque boost 1


[V]/[%]
Function
Manual torque boost 1 ~ %
: Base frequency 1
: Base frequency voltage 1
Base frequency voltage 1

[V]
Function Adjustment range
~ Hz
200V class: ~ V
400V class: ~ V
0
Base frequency
Adjustment range
According to model ⇒ Refer to page K-46.
0
Base frequency
E-16
Output frequency [Hz]

Default setting
Output frequency [Hz]

Default setting

200V models: 
400V models: 
E6581445