Danfoss VLT AutomationDrive FC 300 Programming Manual page 70

Parameter Descriptions
3-61 Ramp 3 Ramp up Time
Range:
3 3
3-62 Ramp 3 Ramp down Time
Range:
Size [ 0.01
related - 3600
*
s]
3-65 Ramp 3 S-ramp Ratio at Accel. Start
Range:
50 % [ 1 - 99
*
%]
3-66 Ramp 3 S-ramp Ratio at Accel. End
Range:
50 % [ 1 - 99
*
%]
3-67 Ramp 3 S-ramp Ratio at Decel. Start
Range:
50 % [ 1 - 99
*
%]
3-68 Ramp 3 S-ramp Ratio at Decel. End
Range:
50 % [ 1 - 99
*
%]
68
®
VLT
Function:
value 0.00 corresponds to 0.01 s in
speed mode. See ramp-down time in
3-62 Ramp 3 Ramp down Time.
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
s
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 4-18 Current
Limit. The value 0.00 corresponds to 0.01 s in
speed mode. See ramp-up time in 3-61 Ramp
3 Ramp up Time.
t dec s x n s RPM
Par . 3 − 62 =
ref RPM
Function:
Enter the proportion of the total ramp-up
time (3-61 Ramp 3 Ramp up Time) 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.
Function:
Enter the proportion of the total ramp-up
time (3-61 Ramp 3 Ramp up Time) in which
the 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 (3-62 Ramp 3 Ramp down Time) 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.
Function:
Enter the proportion of the total ramp-
downdecel time (3-62 Ramp 3 Ramp down
Time) where the deceleration torque
decreases. The larger the percentage value,
the greater the jerk compensation achieved,
MG33MG02 - VLT
AutomationDrive Programming Guide
3-68 Ramp 3 S-ramp Ratio at Decel. End
Range:
3.5.6 3-7* Ramp 4
Configure ramp parameters, see parameter group 3-4*.
3-70 Ramp 4 Type
Option:
[0] Linear
[1] S-ramp
Const Jerk
[2] S-ramp
Const Time
NOTE
If [1] S-ramp Const Jerk 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.
Additional adjustment of the S-ramp ratios or switching
initiators may be necessary.
3-71 Ramp 4 Ramp up Time
Range:
Size [ 0.01
related - 3600
*
s]
3-72 Ramp 4 Ramp Down Time
Range:
Size [ 0.01
related - 3600
*
s]
®
is a registered Danfoss trademark
Function:
and thus the lower the torque jerks in the
application.
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
Accelerates with lowest possible jerk.
S-ramp based on the values set in 3-71 Ramp 4
Ramp up Time and 3-72 Ramp 4 Ramp Down
Time.
Function:
Enter the ramp-up time, i.e. the acceleration
time from 0 RPM to the rated motor speed
n . Choose a ramp-up time such that the
s
output current does not exceed the current
limit in 4-18 Current Limit during ramping.
The value 0.00 corresponds to 0.01 s in
speed mode. See ramp-down time in
3-72 Ramp 4 Ramp Down Time.
t acc s x n s RPM
Par . 3 − 71 =
ref RPM
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
s
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 4-18 Current