Setting Acceleration/Deceleration Time; Automatic Acceleration/Deceleration - Toshiba TOSVERT VF-AS1 Instruction Manual

5.2

Setting acceleration/deceleration time




• Function
1) For acceleration time  programs the time that it takes for the inverter output frequency to go from 0Hz
to maximum frequency .
2) For deceleration time  programs the time that it takes for the inverter output frequency to got from
maximum frequency  to 0Hz.

5.2.1 Automatic acceleration/deceleration

This automatically adjusts acceleration and deceleration time in line with load size.
=

* Adjusts the acceleration/deceleration time automatically within the range of 1/8 to 8 times as long as the time
set with the  or , depending on the current rating of the inverter.
 =
* Automatically adjusts speed during acceleration only. During deceleration, speed is not adjusted
automatically but reduced at the rate set with .
5
Output
frequency [Hz]
Set  (automatic acceleration/deceleration) to  or .
[Parameter setting]
Title

When automatically setting acceleration/deceleration time, always change the acceleration/deceleration time so that
it conforms with the load.
The acceleration/deceleration time changes constantly with load fluctuations.
For inverters that requires a fixed acceleration/deceleration time, use the manual settings (, ).
When using a braking resistor or braking unit, do not set the =. Or the regenerative braking resistor may be
overloaded.
Acceleration may not be complete if the load is such that the inverter is operated in the rated current vicinity. If
acceleration is incomplete, set acceleration/deceleration time manually (=).
Use this parameter after actually connecting the motor.
Setting acceleration/deceleration time (, ) in conformance with mean load allows optimum setting that
conforms to further changes in load.
When the inverter is used with a load that fluctuates considerably, it may fail to adjust the acceleration or
deceleration time in time, and therefore may be tripped.
: Automatic acceleration/deceleration
: Acceleration time 1
: Deceleration time 1
When load is small

0
Acceleration Deceleration
Acceleration/deceleration time → decrease
Function
Automatic acceleration/deceleration
Output
When load is large
frequency [Hz]

0
Time [s]
Acceleration
Acceleration/deceleration time → increase
Adjustment range
:Deselect (Manual setting)
:Automatic setting
:Automatic setting (during
acceleration only)
E-2
E6581301
Time [s]
Deceleration
Default setting
