Increasing Starting Torque - Toshiba TOSVERT VF-nC3 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)
5.4

Increasing starting torque

 : Torque boost setting macro function
• Function
Simultaneously switches inverter output (V/F) control and programs motor constants automatically (On-
line automtic-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
Torque boost setting macro

function
Note: Parameter displays on the right always return to after setting. The previous setting is displayed on the left.
 
Ex.
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)
 : 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: Disabled
1: Automatic torque boost + auto-tuning
2: Vector control + auto-tuning
3: Energy saving + auto-tuning

E-7
Adjustment range
E6581595
Default setting
5
0