Ramp - Danfoss VLT AutomationDrive FC 301 Programming Manual

Programming Guide | VLT® AutomationDrive FC 301/FC 302
Enter the proportion of the total ramp-down time (parameter 3-62 Ramp 3 Ramp Down Time) where the deceleration torque decreases.
The larger the percentage value, the greater the jerk compensation achieved, and thus the lower the torque jerks in the application.

3-7* Ramp 4

6.5.8
3-70 Ramp 4 Type
Default value: [0] Linear
Setup: All setups
Data type: Uint8
If [1] S-ramp Const Jerk is selected and the reference during ramping is changed, the ramp time may be prolonged to realize
a jerk-free movement, which may result in a longer start or stop time. Additional adjustment of the S-ramp ratios or switching
initiators may be necessary.
Select the ramp type, depending on requirements for acceleration/deceleration. A linear ramp gives constant acceleration during
ramping. An S-ramp gives non-linear acceleration, compensating for jerk in the application.
Option Name
[0]* Linear
[1] S-ramp Const Jerk
[2] S-ramp Const Time
[4] Linear anti-sway
3-71 Ramp 4 Ramp Up Time
Default value:
Size related
Setup: All setups
Data type: Uint32
Enter the ramp-up time, that is the acceleration time from 0 RPM to the nominal motor speed ns. Select a ramp-up time such that the
output current does not exceed the current limit in parameter 4-18 Current Limit during ramping. The value 0.00 corresponds to 0.01 s in
speed mode. See ramp-down time in parameter 3-72 Ramp 4 Ramp Down Time.
© 2024.09
Parameter type:
Conversion index:
Change during operation:
NOTICE
Description
Acceleration with lowest possible jerk.
S-ramp based on the values set in parameter 3-71 Ramp 3 Ramp
Up Time and parameter 3-72 Ramp 3 Ramp Down Time.
This option is only available in software version 48.96 or
newer.
Anti-sway ramp for smooth starting and stopping without
swinging for cranes with hanging load. With the anti-sway ramp,
the ramp time is the time it takes to accelerate/decelerate from
actual speed to the set speed reference. In addition to the ramp
time settings, other required settings for the anti-sway ramp are
found in parameter group 24-7* Anti-Sway Ramp.
Parameter type:
Conversion index:
Change during operation:
Parameter Descriptions
Option
–
True
NOTICE
Range, 0.01 - 3600 s
-2
True
AU275636650261en-003201 / 130R0334 | 171