Danfoss FC 300 Design Manual page 154

FC 300 Design Guide
3-40 Ramp 1 Type
Value:
Linear
S-ramp
Function:
Select the ramp type, depending on requirements
for acceleration/deceleration.
A linear ramp will give constant acceleration dur-
ing ramping. An S-ramp will give non-linear ac-
celeration, compensating for jerk in the applica-
tion.
3-41 Ramp 1 Ramp up Time
Value:
0.01 - 3600.00 s
Function:
Enter the ramp-up time, i.e. the acceleration time
from 0 RPM to the rated motor speed n
1-25). Choose a ramp-up time such that the out-
put current does not exceed the current limit in
par. 4-18 during ramping. The value 0.00 corre-
sponds to 0.01 sec. in speed mode. See ramp-
down time in par. 3-42.
t x
acc
Par
. 3 − 41 =
3-42 Ramp 1 Ramp Down Time
Value:
0.01 - 3600.00 s
Function:
Enter the ramp-down time, i.e. the deceleration
time from the rated motor speed n
to 0 RPM. Choose a ramp-down time such that no
over-voltage arises in the inverter due to regen-
erative 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
factory setting
154
How to Programme
[0]
[1]
(par.
M,N
par
η . 1 − 25
norm
s
ref RPM
∆
(par. 1-25)
M,N
() display text [] value for use in communication via serial communication port
MG.33.B7.02 - VLT is a registered Danfoss trademark
to 0.01 s in speed mode. See ramp-up time in par.
3-41.
t
acc
Par
. 3 − 42 =
Ramp 1 S-ramp Ratio at Accel.
3-45
Start
Value:
1 - 99%
Function:
Enter the proportion of the total ramp-up time
(par. 3-41) in which the acceleration torque in-
creases. The larger the percentage value, the
greater the jerk compensation achieved, and thus
the lower the torque jerks occurring in the appli-
s
cation.
3-46 Ramp 1 S-ramp Ratio at Accel. End
Value:
1 - 99%
Function:
Enter the proportion of the total ramp-up time
(par. 3-41) in which the acceleration torque de-
creases. The larger the percentage value, the
greater the jerk compensation achieved, and thus
the lower the torque jerks in the application.
Ramp 1 S-ramp Ratio at Decel.
3-47
Start
Value:
1 - 99%
Function:
Enter the proportion of the total ramp-down time
(par. 3-42) 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 application.
s
3-48 Ramp 1 S-ramp Ratio at Decel. End
Value:
1 - 99%
Function:
Enter the proportion of the total ramp-down time
(par. 3-42) where the deceleration torque decrea-
ses. The larger the percentage value, the greater
x par
η . 1 − 25
norm
s
ref RPM
∆
50%
50%
50%
50%