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Manually Setting Acceleration/deceleration Time; Increasing Starting Torque - Toshiba Tosvert VF-AS1 Instruction Manual

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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]
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.
When running under not connect the motor at setting =,,, or , it might to not operate normally. It will
be able to running normally by connecting the motor.
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.

Increasing starting torque

 : Automatic torque boost
• Function
Simultaneously switches inverter output V/f control and programs motor constants automatically
(auto-tuning function 1) 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 1
 Sensorless vector control 1+auto-tuning 1
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]
Automatic torque boost
Note: Parameter displays on the right always return to  after resetting. The previous setting is displayed on the
 
[Note]~ sec.
[Note]~ sec.
: Disabled (Always  is displayed.)
: Automatic torque boost+auto-tuning 1
: Sensorless vector control 1+auto-tuning 1
= (Manual setting)
Time [s]
Adjustment range
 Refer to page K-48.
 Refer to page K-48.
Adjustment range
Default setting
According to model
According to model
Default setting


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