Increasing Starting Torque - Toshiba TOSVERT VF-MB1 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. (Refer to section 13.1 for details)
5.5

Increasing starting torque

 : Torque boost setting macro function
 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.
[Parameter setting]
Title
Torque boost setting macro

function
Note1) Parameter displays on the right always return to after setting. The previous setting is displayed on the left.
Ex.  
Note2) Auto-tuning is performed at the start of the motor.
Caution:
When the torque boost setting macro function  is set, look at the motor's name plate and set the
following parameters.
   : Base frequency 1 (rated frequency)
 : Base frequency voltage 1 (rated voltage)
vlv
 : Motor rated capacity
 : Motor rated current
 : Motor rated speed
Set the other motor constants as necessary.
1) Increasing torque automatically according to the load
 is set to  (Automatic torque boost + auto-tuning)
When torque boost setting macro function control  is set to 1 (automatic torque boost + auto-tuning),
the inverter keeps track of the load current in any speed range and automatically adjusts the output voltage to
ensure enough torque and stable operation.
Function
0: -
1: Automatic torque boost + auto-tuning
2: Vector control + auto-tuning
3: Energy saving + auto-tuning
E-7
Adjustment range
E6581697
5
Default setting
0