Danfoss FC 300

3-61 Ramp 3 Ramp up Time
Range: Function:
Size re-
lated
[0.01 - 3600.00 s] Enter the ramp-up time, i.e. the acceleration time from 0 RPM
to the rated motor speed n
M,N
(par. 1-25). Choose 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. 3-62.
3-62 Ramp 3 Ramp down Time
Range: Function:
Size re-
lated
[0.01 - 3600.00 s ] Enter the ramp-down time, i.e. the deceleration time from the
rated motor speed nM,N (par. 1-25) to 0 RPM. 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 gen-
erated 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. 3-61.
Par .3− 62 =
t
dec
s xn
M , N
(
par .1− 25
)
RPM
Δ ref RPM
3-65 Ramp 3 S-ramp Ratio at Accel. Start
Range: Function:
50%
*
[1 - 99%] Enter the proportion of the total ramp-up time (par. 3-61) 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.
3-66 Ramp 3 S-ramp Ratio at Accel. End
Range: Function:
50%
*
[1 - 99%] Enter the proportion of the total ramp-up time (par. 3-61) 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.
3-67 Ramp 3 S-ramp Ratio at Decel. Start
Range: Function:
50%
*
[1 - 99%] Enter the proportion of the total ramp-down time (par. 3-62)
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.
3-68 Ramp 3 S-ramp Ratio at Decel. End
Range: Function:
50%
*
[1 - 99%] Enter the proportion of the total ramp-down time (par. 3-62)
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.
FC 300 Programming Guide 2. How to Programme
MG.33.M2.02 - VLT
®
is a registered Danfoss trademark 81
2