Danfoss VLT AutomationDrive FC 300 Programming Manual page 81

3 Parameter descriptions
[1] S-ramp Const Jerk
[2] S-ramp Const Time
NB!
If S-ramp [1] is selected and the reference during ramping is changed the ramp time may be prolonged in order to realize a jerk free
movement which may result in a longer start or stop time.
3
Additional adjustment of the S-ramp ratios or switching initiators may be necessary.
3-61 Ramp 3 Ramp up Time
Range:
Application [Application dependant]
dependent*
3-62 Ramp 3 Ramp down Time
Range:
Application [Application dependant]
dependent*
3-65 Ramp 3 S-ramp Ratio at Accel. Start
Range:
50 %* [Application dependant]
3-66 Ramp 3 S-ramp Ratio at Accel. End
Range:
50 %* [Application dependant]
3-67 Ramp 3 S-ramp Ratio at Decel. Start
Range:
50 %* [Application dependant]
3-68 Ramp 3 S-ramp Ratio at Decel. End
Range:
50 %* [Application dependant]
80
Accelerates with lowest possible jerk.
S-ramp based on the values set in par. 3-61
down Time
Function:
Enter the ramp-up time, i.e. the acceleration time from 0 RPM to the rated motor speed n
a ramp-up time such that the output current does not exceed the current limit in par. 4-18
Limit
during ramping. The value 0.00 corresponds to 0.01 sec. in speed mode. See ramp-down time
Ramp 3 Ramp down Time
in par. 3-62
Function:
Enter the ramp-down time, i.e. the deceleration time from the rated motor speed n
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
Current Limit
in par. 4-18 . The value 0.00 corresponds to 0.01 s in speed mode. See ramp-up time
Ramp 3 Ramp up Time
in par. 3-61 .
t dec s x n s RPM
Par
. 3 − 62 =
ref RPM
Function:
Enter the proportion of the total ramp-up time (par. 3-61
acceleration torque increases. The larger the percentage value, the greater the jerk compensation
achieved, and thus the lower the torque jerks in the application.
Function:
Enter the proportion of the total ramp-up time (par. 3-61
acceleration torque decreases. The larger the percentage value, the greater the jerk compensation
achieved, and thus the lower the torque jerks in the application.
Function:
Enter the proportion of the total ramp-down time (par. 3-62
deceleration torque increases. The larger the percentage value, the greater the jerk compensation
achieved, and thus the lower the torque jerks in the application.
Function:
Enter the proportion of the total ramp-downdecel time (par. 3-62
the deceleration torque decreases. The larger the percentage value, the greater the jerk compen-
sation achieved, and thus the lower the torque jerks in the application.
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MG.33.M8.02 - VLT is a registered Danfoss trademark
FC 300 Programming Guide
Ramp 3 Ramp up Time and par. 3-62
.
Ramp 3 Ramp up Time
Ramp 3 Ramp up Time
Ramp 3 Ramp down Time
Ramp 3 Ramp down Time
Ramp 3 Ramp
. Choose
s
Current
to 0 RPM.
s
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