Danfoss VLT AutomationDrive FC 301 Programming Manual page 143

VLT AutomationDrive FC 301/302
Programming Guide
Speed
Ramp (X) S-Ramp
Ratio at Accel.End
Linear
Ramp (X)
S-Ramp
Jerk compensated
Ratio at
Accel.End
Ramp (X)
Up Time
Illustration 52: Non-linear Ramping Times
Parameter 3-40 Ramp 1 Type
Table 222: Parameter 3-40 Ramp 1 Type
3-40 Ramp 1 Type
Default value: [1] Linear
Conversion index: –
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. Extra 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
Parameter 3-41 Ramp 1 Ramp Up Time
Table 223: Parameter 3-41 Ramp 1 Ramp Up Time
3-41 Ramp 1 Ramp Up Time
Default value: Size related
Conversion index: -2
Enter the ramp-up time, that is the acceleration time from 0 RPM to the synchronous motor speed n
prevents the output current from exceeding the current limit in parameter 4-18 Current Limit during ramping. The value 0.00 corre-
sponds to 0.01 s in speed mode. See ramp-down time in parameter 3-42 Ramp 1 Ramp Down Time.
t s × n RPM
acc s
Par . 3 − 41 =
ref RPM
Danfoss A/S © 2022.12
Ramp (X) S-Ramp
Ratio at Dec.End
Ramp (X)
S-Ramp
Ratio at
Dec.End
Ramp (X)
Down Time
Parameter type: Option
Data type: Uint8
N O T I C E
Description
Acceleration with lowest possible jerk.
S-ramp based on the values set in parameter 3-41 Ramp 1 Ramp Up Time and parameter 3-42 Ramp
1 Ramp Down Time.
Parameter type: Range, 0.01 - 3600 s
Data type: Uint32
Parameter Descriptions
Setup: All setups
Change during operation: True
Setup: All setups
Change during operation: True
. Select a ramp-up time which
S
AU275636650261en-000101 / 130R0334 | 143