Danfoss FC 300 Design Manual page 183

FC 300 Design Guide
3-6* Ramp 3
"
Configure ramp parameters, see 3-4*.
3-60 Ramp 3 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.
3-61 Ramp 3 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. 3-62.
3-62 Ramp 3 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 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 generated current does not exceed
the current limit set in par. 4-18. The value
* default setting ( )
How to Program
[0]
[1]
M,N
display text [ ] value for use in communication via serial communication port
MG.33.B6.22 - VLT is a registered Danfoss trademark
0.00 corresponds to 0.01 s in speed mode.
See ramp-up time in par. 3-61.
3-65 Ramp 3 S-ramp Ratio at Accel. Start
Range:
1 - 99%
Function:
Enter the proportion of the total ramp-up time (par.
3-61) 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.
3-66 Ramp 3 S-ramp Ratio at Accel. End
Range:
1 - 99%
Function:
Enter the proportion of the total ramp-up time (par.
3-61) 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.
3-67 Ramp 3 S-ramp Ratio at Decel. Start
Range:
1 - 99%
Function:
Enter the proportion of the total ramp-down time
(par. 3-62) 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
3-68 Ramp 3 S-ramp Ratio at Decel. End
Range:
1 - 99%
Function:
Enter the proportion of the total ramp-down
time (par. 3-62) where the deceleration torque
decreases. The larger the percentage value, the
*
50%
*
50%
*
50%
*
50%
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