Manually Setting Acceleration/Deceleration Time; Increasing Starting Torque - Toshiba TOSVERT VF-AS1 Instruction Manual

5.2.2 Manually setting acceleration/deceleration time

Set acceleration time from 0 (Hz) operation frequency to maximum frequency  and deceleration time as the time
when operation frequency goes from maximum frequency  to 0 (Hz).
Output frequency [Hz]
[Parameter setting]
Title
 Acceleration time 1
 Deceleration time 1
Note:The minimum setting of acceleration and deceleration times have been set respectively at 0.1 sec. by default, but
they can be changed within a range of 0.01 sec. (setting range:0.01~600.0 sec.) by changing the setting of the
parameter  (default setting).
⇒ For details, refer to Section 5.20.
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 details, refer to Section 13.1.
5.3

Increasing starting torque

 : Automatic torque boost
• Function
Simultaneously switches inverter output V/f control and programs motor constants automatically (Off-
line automatic-tuning function) to improve torque generated by the motor. This parameter integrates the
setting of special V/f control selection such as automatic torque boost or vector control.
Constant torque characteristics (default setting)
Automatic torque boost+auto-tuning
Sensorless vector control 1+auto-tuning
Note: Square reduction torque control, sensor vector control (optional), etc. can be selected using the V/f
control mode selection parameter .
⇒ For details, refer to Section 5.6.
[Parameter setting]
Title
Automatic torque boost

Note 1: Parameter displays on the right always return to  after resetting. The previous setting is displayed on the
left.
Ex. 

Note 2: If  is set to  (= by default), the motor constant will not be set automatically by just
executing the .

0

Function
Function
:(Always  is displayed.)
:Automatic torque boost+auto-tuning
: Sensorless vector control 1+auto-tuning
E-3
= (Manual setting)
Time [s]

Adjustment range
[Note]~ sec.
[Note]~ sec.
Adjustment range
E6581301
Default setting
According to
model
According to
model
5
Default setting
