Increasing Starting Torque - Toshiba TOSVERT VF-S9 Instruction Manual

3) Increasing starting torque

Setting V/F control selection
Detects load current in all speed ranges and automatically adjusts voltage output (torque boost) from inverter.
This gives steady torque for stable runs.
5
Motor constant must be set
If the motor you are using is a 4P Toshiba standard motor and if it has the same capacity as the inverter,
there is basically no need to set the motor constant.
There are two procedures for setting the motor constant.
1) The motor constant can be set automatically (auto-tuning). Program the extended parameter
2) Each motor constant can be set individually.
4) Sensorless vector control--increasing starting torque and achieving high-precision
operation.
Setting of V/F control mode selection
Using sensorless vector control with a Toshiba standard motor will provide the highest torque at the lowest
speed ranges. The effects obtained through the use of sensorless vector control are described below.
(1) Provides large starting torque.
(2) Effective when stable operation is required to move smoothly up from the lowest speeds.
(3) Effective in elimination of load fluctuations caused by motor slippage.
Motor constant must be set
If the motor you are using is a 4P Toshiba standard motor and if it has the same capacity as the inverter,
there is basically no need to set the motor constant.
There are three procedures for setting motor constants.
1) The sensorless vector control and motor constants (auto-tuning) can be set at a time.
Set the basic parameter
2) The motor constant can be automatically set (auto-tuning).
Set the extended parameter
Base frequency voltage
Automatically
adjusts the amount
of torque boost.
Note: This control system can oscillate and destabilize runs depending on the load. If that should
happen, set V/F control mode selection
to .
to .
to (automatic torque boost)
Base frequency
to (V/F constant) and increase torque manually.
⇒ For details, see selection 2 in 6.13.
⇒ For details, see selection 3 in 6.13.
to (Sensorless vector control)
⇒ For details, see 1 in 5.2.
⇒ For details, see selection 2 in 6.13.
to .
E-16
E6580757
Output frequency (Hz)