Delta VFD022B21A - Deceleration Time 4; Accel;Decel Time Unit

Chapter 5 Parameters_VFD-B Series
Revision 10/2005, BE13, SW V4.08 5-33
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aDeceleration Time 4 (Tdecel 4) Unit: 0.1/0.01
Settings 0.01 to 3600.0 sec Factory Setting: 10.0
Factory setting for models of 30hp (22kW) and above is 60sec.
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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).