Delta Electronics VFD-E manual 01.17, 01.18

Chapter 4 Parameters

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

0.1to 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

	1			2
		3		4
	1			2
		3		4
1	2		3	4
Disable S curve
			Enable S curve
		Acceleration/deceleration Characteristics

Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11 4-47