Parameter 3-66 Ramp 3 S-ramp Ratio at Accel. End
Table 201: Parameter 3-66 Ramp 3 S-ramp Ratio at Accel. End
3-66 Ramp 3 S-ramp Ratio at Accel. End
Default value: 50%
Parameter type: Range, 1 - 99%
Setup: All setups
Conversion index: 0
Data type: Uint8
Change during operation: True
Enter the proportion of the total ramp-up time (
parameter 3-61 Ramp 3 Ramp Up Time
) in which the acceleration torque decreases.
The larger the percentage value, the greater the jerk compensation achieved, and thus the lower the torque jerks in the application.
Parameter 3-67 Ramp 3 S-ramp Ratio at Decel. Start
Table 202: Parameter 3-67 Ramp 3 S-ramp Ratio at Decel. Start
3-67 Ramp 3 S-ramp Ratio at Decel. Start
Default value: 50%
Parameter type: Range, 1 - 99%
Setup: All setups
Conversion index: 0
Data type: Uint8
Change during operation: True
Enter the proportion of the total ramp-down time (
parameter 3-52 Ramp 1 Ramp Down Time
) where the deceleration torque increa-
ses. The larger the percentage value, the greater the jerk compensation achieved, and thus the lower the torque jerks in the applica-
tion.
Parameter 3-68 Ramp 3 S-ramp Ratio at Decel. End
Table 203: Parameter 3-68 Ramp 3 S-ramp Ratio at Decel. End
3-68 Ramp 3 S-ramp Ratio at Decel. End
Default value: 50%
Parameter type: Range, 1 - 99%
Setup: All setups
Conversion index: 0
Data type: Uint8
Change during operation: True
Enter the proportion of the total ramp-down time (
parameter 3-62 Ramp 3 Ramp Down Time
) where the deceleration torque decrea-
ses. The larger the percentage value, the greater the jerk compensation achieved, and thus the lower the torque jerks in the applica-
tion.
4.4.6 3-7* Ramp 4
Parameter 3-70 Ramp 4 Type
Table 204: Parameter 3-70 Ramp 4 Type
3-70 Ramp 4 Type
Default value: [1] Linear
Parameter type: Option
Setup: All setups
Conversion index: –
Data type: Uint8
Change during operation: True
N O T I C E
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 ini-
tiators 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.
AU373327181955en-000101 / 130R1208 | 117
Danfoss A/S © 2021.08
Parameter Descriptions
VLT® AutomationDrive EZ FC 321
Programming Guide
