Chapter 5 Parameters
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VFD-B Series
Revision July 2008, BE16, SW V4.08 & V5.00
5-31
01 - 23
Accel/Decel Time Unit
Factory Setting: 01
Settings
00
Unit: 1 sec
01
Unit:
0.1
sec
02
Unit:
0.01
sec
The Acceleration Time is used to determine the time required for the AC motor drive to ramp
from 0 Hz to Maximum Output Frequency (Pr.01-00). The rate is linear unless S-Curve is
“Enabled”, see Pr.01-16.
The Deceleration Time is used to determine the time required for the AC motor drive to
decelerate from the Maximum Output Frequency (Pr.01-00) down to 0 Hz. The rate is linear
unless S-Curve is “Enabled.”, see Pr.01-17.
The Acceleration/Deceleration Time 1, 2, 3, 4 are selected according to the Multi-Function
Input Terminals Settings. See Pr.04-04 to Pr.04-09 for more details.
In the diagram shown below, the Acceleration/Deceleration Time of the AC motor drive is the
time between 0 Hz to Maximum Output Frequency (Pr.01-00). Suppose the Maximum Output
Frequency is 60 Hz, Minimum Output Frequency (Pr.01-05) is 1.0 Hz, and
Acceleration/Deceleration Time is 10 seconds. The actual time for the AC motor drive to
accelerate from start-up to 60 Hz and to decelerate from 60Hz to 1.0Hz is in this case 9.83
seconds. ((60-1) * 10 /60=9.83secs).
01-00
01-09
01-11
01-18
01-20
01-10
01-12
01-19
01-21
Frequency
Time
Accel. Time
Decel. Time
The definition of
Accel./Decel. Time
Max. output
Frequency
setting
operation
frequency
Min. output
frequency
01-05
Resulting
Resulting
Accel. Time
Decel. Time
Resulting Accel./Decel. Time
0 Hz
