Danfoss FC 300 Design Manual page 182

FC 300 Design Guide
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.
3-51 Ramp 2 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. 3-52.
3-52 Ramp 2 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 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. 3-51.
3-55 Ramp 2 S-ramp Ratio at Accel. Start
Range:
1 - 99%
default setting ( ) display text
*
182
How to Program
Enter the proportion of the total ramp-up time (par.
3-51) 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.
*
s
Enter the proportion of the total ramp-up time (par.
3-51) in which the acceleration torque decreases.
The larger the percentage value, the greater the
jerk compensation achieved, and thus the lower
M,N
the torque jerks in the application.
Enter the proportion of the total ramp-down time
(par. 3-52) 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
(par. 1-25)
M,N
Enter the proportion of the total ramp-down
time (par. 3-52) where the deceleration torque
decreases. The larger the percentage value, the
greater the jerk compensation achieved, and thus
the lower the torque jerks in the application.
*
50%
[ ] value for use in communication via serial communication port
MG.33.B6.22 - VLT is a registered Danfoss trademark
Function:
3-56 Ramp 2 S-ramp Ratio at Accel. End
Range:
1 - 99%
Function:
3-57 Ramp 2 S-ramp Ratio at Decel. Start
Range:
1 - 99%
Function:
3-58 Ramp 2 S-ramp Ratio at Decel. End
Range:
1 - 99%
Function:
*
50%
*
50%
*
50%