Increasing Starting Torque - Toshiba TOSVERT VF-S9 Instruction Manual

If the programmed value is shorter than the optimum acceleration/deceleration time determined by load
conditions, overcurrent stall or overvoltage stall function may make the acceleration/deceleration time
longer than the programmed time. If an even shorter acceleration/deceleration time is programmed, there
may be an overcurrent trip or overvoltage trip for inverter protection. (for further details, see 13.1).
5.2

Increasing starting torque

: Automatic torque boost
• Function
Simultaneously switches inverter output (V/F) control and programs motor constants automatically (On-
line automatic-tuning function) to improve torque generated by the motor. This parameter integrates the
setting of special V/F control selection such as vector control.
Title
Automatic torque boost
Note: Parameter displays on the right always return to 0 after setting. The pervious setting is displayed on the left.
Ex.
1) When using vector control (increasing starting torque and high-precision opera-
tions)
Set the automatic control
Setting automatic control
bringing out the maximum in motor characteristics from the low-speed range. This suppresses changes in
motor speed caused by fluctuations in load to provide high precision operation. This is an optimum feature for
elevators and other load transporting machinery.
[Methods of setting]
Key operated
Function
0: Disabled
1: Sensorless vector control + auto-tuning
to (sensorless vector control + auto-tuning)
to (sensorless vector control + auto-tuning) provides high starting torque
LED display
Displays the operation frequency. (Perform during operation
stopped.) (When standard monitor display selection
[operation frequency])
Press the MON key to display the first basic parameter
(automatic acceleration/deceleration).
Press the
boost).
Press the ENTER key to display the parameter setting.
E-3
Adjustment range
Operation
key to change the parameter to
E6580757
Default setting
5
0
is set to
(automatic torque