Danfoss FC 300 Programming Manual page 67

FC 300 Programming Guide
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.
3-41 Ramp 1 Ramp up Time
Range:
Size related [0.01 - 3600.00 s]
3-42 Ramp 1 Ramp Down Time
Range:
Size related [0.01 - 3600.00 s]
3-45 Ramp 1 S-ramp Ratio at Accel. Start
Range:
*
50% [1 - 99%]
3-46 Ramp 1 S-ramp Ratio at Accel. End
Range:
*
50% [1 - 99%]
3-47 Ramp 1 S-ramp Ratio at Decel. Start
Range:
*
50% [1 - 99%]
Function:
Enter the ramp-up time, i.e. the acceleration time from 0 RPM to the rated motor speed n
a ramp-up time such that the output current does not exceed the current limit in par. 4-18 during ramping. The
value 0.00 corresponds to 0.01 sec. in speed mode. See ramp-down time in par. 3-42.
t acc s x n M
Par
. 3 − 41 =
Function:
Enter the ramp-down time, i.e. the deceleration time from the rated motor speed n
Choose a ramp-down time such that no over-voltage arises in the inverter due to regenerative operation of the
motor, and such that the generated current does not exceed the current limit set in par. 4-18. The value 0.00
corresponds to 0.01 s in speed mode. See ramp-up time in par. 3-41.
t acc s x n M
Par
. 3 − 42 =
Function:
Enter the proportion of the total ramp-up time (par. 3-41) in which the acceleration torque increases. The larger
the percentage value, the greater the jerk compensation achieved, and thus the lower the torque jerks occurring
in the application.
Function:
Enter the proportion of the total ramp-up time (par. 3-41) 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.
Function:
Enter the proportion of the total ramp-down time (par. 3-42) where the deceleration torque increases. The larger
the percentage value, the greater the jerk compensation achieved, and thus the lower the torque jerks in the
application.
®
MG.33.M3.02 - VLT is a registered Danfoss trademark
( par . 1 − 25 ) RPM
, N
ref RPM
Δ
( . 1 − 25 )
par RPM
N
,
ref RPM
Δ
2. How to Programme
(par. 1-25). Choose
M,N
(par. 1-25) to 0 RPM.
M,N
67
2