VLT
®
MICRO
Frequency
S-curve characteristics Time
Time
Time
Pr.14 > d01
"S curve Enabled"
Pr.14 = d00
"S curve Disabled"
Accel time
1 or 2
Decel time
1 or 2
Note: See Pr.101; Automatic Accel and Decel times are default. Change to "Linear
Acceleration/Deceleration" to enable manual adjustment.
Pr.13 Deceleration Time 2 (Can be programmed while the drive is running.)
Factory Setting d10.0 Sec
Units 0.1 Sec
Parameter value d0.1 - d600.0 Sec
This parameter determines the time for the AC drive to decelerate from the Maximum
Output Frequency (Pr.03) down to 0 Hz. The rate is linear unless S Curve is "enabled".
The rate of deceleration applies to any decrease in command frequency unless
Deceleration Time 1 is selected. Deceleration Time 1 and 2 may be selected using the
Multi-Function Inputs M1 - 3. (See Parameters 39, 40 and 41.)
Application Notes:
1. The Accel./Decel. Time is defined as the time required to change the output
frequency from the value of Pr.03 to the value of Pr.08 (Maximum and Minimum
Output Frequencies).
2. The Accel./Decel. time can be calculated by using the parameter values of the
following formula: a = [(Pr.10, 11, 12, 13)(Pr.03 Pr.08)](Pr.03 0 Hz).
3. The actual Accel./Decel. time should be measured to insure it meets the system
requirements.
Pr.14 S-curve
Factory Setting d00 Sec
Units None
Parameter value d00 - d07
This parameter should be programmed during start-up. It is used to provide smooth
acceleration and deceleration. S-curves can be selected from 1 to 7. Settings 1 to 7 are
added to the active accel./decel. times to form an adjustable S-curve.
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