Danfoss FC 300 Design Manual page 184

FC 300 Design Guide
greater the jerk compensation achieved, and thus
the lower the torque jerks in the application.
3-7* Ramp 4
"
Configure ramp parameters, see 3-4*.
3-70 Ramp 4 Type
Option:
*
Linear
S-ramp
Function:
Select the ramp type, depending on requirements
for acceleration and deceleration. A linear ramp
will give constant acceleration during ramping.
An S-ramp will give non-linear acceleration,
compensating for jerk in the application.
NOTE
If S-ramp [1] is selected and the
reference during ramping is changed,
the ramp time may be prolonged in
order to allow jerk free movement which may
result in a longer start or stop way.
Additional adjustment of the S-ramp ratios or
switching initiators may be necessary.
3-71 Ramp 4 Ramp-up Time
Range:
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
(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. 3-72.
3-72 Ramp 4 Ramp-down Time
Range:
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
default setting ( ) display text
*
184
How to Program
overvoltage 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. 3-71.
[0]
[1]
Enter the proportion of the total ramp-up time (par.
3-71) in which the acceleration torque increases.
The larger the percentage value, the greater the
jerk compensation achieved, and thus the lower
the torque jerks in the application.
Enter the proportion of the total ramp-up time (par.
3-71) in which the acceleration torque decreases.
The larger the percentage value, the greater the
*
s
jerk compensation achieved, and thus the lower
the torque jerks in the application.
M,N
Enter the proportion of the total ramp-down time
(par. 3-72) 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.
*
s
Enter the proportion of the total ramp-down
(par. 1-25) time (par. 3-72) where the deceleration torque
M,N
decreases. The larger the percentage value, the
[ ] value for use in communication via serial communication port
MG.33.B6.22 - VLT is a registered Danfoss trademark
3-75 Ramp 4 S-ramp Ratio at Accel. Start
Range:
1 - 99%
Function:
3-76 Ramp 4 S-ramp Ratio at Accel. End
Range:
1 - 99%
Function:
3-77 Ramp 4 S-ramp Ratio at Decel. Start
Range:
1 - 99%
Function:
3-78 Ramp 4 S-ramp Ratio at Decel. End
Range:
1 - 99%
Function:
*
50%
*
50%
*
50%
*
50%