Danfoss FC 300

3-55 Ramp 2 S-ramp Ratio at Accel. Start
Range: Function:
50%
*
[1 - 99%] Enter the proportion of the total ramp-up time (par. 3-51) in
which the acceleration torque increases. The larger the per-
centage value, the greater the jerk compensation achieved, and
thus the lower the torque jerks in the application.
3-56 Ramp 2 S-ramp Ratio at Accel. End
Range: Function:
50%
*
[1 - 99%] Enter the proportion of the total ramp-up time (par. 3-51) in
which the acceleration torque decreases. The larger the per-
centage value, the greater the jerk compensation achieved, and
thus the lower the torque jerks in the application.
3-57 Ramp 2 S-ramp Ratio at Decel. Start
Range: Function:
50%
*
[1 - 99%] Enter the proportion of the total ramp-down time (par. 3-52)
where the deceleration torque increases The larger the per-
centage value, the greater the jerk compensation achieved, and
thus the lower the torque jerks in the application.
3-58 Ramp 2 S-ramp Ratio at Decel. End
Range: Function:
50%
*
[1 - 99%] Enter the proportion of the total ramp-down time (par. 3-52)
where the deceleration torque decreases. The larger the per-
centage value, the greater the jerk compensation achieved, and
thus the lower the torque jerks in the application.
2.6.6. 3-6* Ramp 3
Configure ramp parameters, see 3-4*.
3-60 Ramp 3 Type
Option: Function:
Select the ramp type, depending on requirements for accelera-
tion and deceleration. A linear ramp will give constant acceler-
ation during ramping. An S-ramp will give non-linear accelera-
tion, compensating for jerk in the application.
[0]
*
Linear
[1] S-ramp Const Jerk Accelerates with lowest possible jerk.
[2] S-ramp Const Time S-ramp based on the values set in par. 3-61 and 3-62
NB!
If S-ramp [1] is selected and the reference during ramping is changed the ramp time
may be prolonged in order 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.
2. How to Programme FC 300 Programming Guide
80 MG.33.M2.02 - VLT
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