AC Motor Drive User Manual

Chapter 4 Parameters|
Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11 4-47
During Auto deceleration, regenerative energy is measured and the motor is smoothly stopped
with the fastest deceleration time.
But when this parameter is set to 04, the actual accel/decel time will be equal to or more than
parameter Pr.01.09 ~Pr.01.12.
 Auto acceleration/deceleration makes the complicated processes of tuning unnecessary. It
makes operation efficient and saves energy by acceleration without stall and deceleration
without brake resistor.
 In applications with brake resistor or brake unit, Auto deceleration shall not be used.
01.17 Acceleration S-Curve Unit: 0.1/0.01
01.18 Deceleration S-Curve Unit: 0.1/0.01
Factory Setting: 0
Settings 0.0 S-curve disabled
0.1 to 10.0/0.01 to 10.00 S-curve enabled (10.0/10.00 is the smoothest)
 This parameter is used to ensure smooth acceleration and deceleration via S-curve.
The S-curve is disabled when set to 0.0 and enabled when set to 0.1 to 10.0/0.01 to 10.00.
Setting 0.1/0.01 gives the quickest and setting 10.0/10.00 the longest and smoothest S-curve.
The AC motor drive will not follow the Accel/Decel Times in Pr.01.09 to Pr.01.12.
 The diagram below shows that the original setting of the Accel/Decel Time is only for reference
when the S-curve is enabled. The actual Accel/Decel Time depends on the selected S-curve
(0.1 to 10.0).
The total Accel. Time=Pr.01.09 + Pr.01.17 or Pr.01.11 + Pr.01.17
The total Decel. Time=Pr.01.10 + Pr.01.18 or Pr.01.12 + Pr.01.18
3
1
2
4
1
3
4
2
1 2
3 4
Disable S curve
Enable S curve
A
cceleration/deceleration Characteristics