Ramp 4 Type; Ramp 4 Ramp Up Time; Ramp 4 Ramp Down Time; Ramp 4 S-Ramp Ratio At Accel. Start/End - Danfoss VLT AutomationDrive FC 302 Programming Manual

Parameter Descriptions
3-66 Ramp 3 S-ramp Ratio at Accel. End
Range: Function:
50 % [ 1 - Enter the proportion of the total ramp-up time
*
99 %] (parameter 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.
3-67 Ramp 3 S-ramp Ratio at Decel. Start
Range: Function:
50 % [ 1 - Enter the proportion of the total ramp-down
*
99 %] time (parameter 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.
3-68 Ramp 3 S-ramp Ratio at Decel. End
Range: Function:
50 % [ 1 - Enter the proportion of the total ramp-down
*
decel time (parameter 3-62 Ramp 3 Ramp down
99 %]
Time) 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.
3.4.8 3-7* Ramp 4
Configure ramp parameters, see parameter group 3-4*
Ramp 1.

3-70 Ramp 4 Type

Option: Function:
Select the ramp type, depending on
requirements for acceleration and deceleration.
A linear ramp gives constant acceleration
during ramping. An S-ramp gives non-linear
acceleration, compensating for jerk in the
application.
[0] Linear
*
[1] S-ramp Accelerates with lowest possible jerk.
Const Jerk
[2] S-ramp S-ramp based on the values set in
Const parameter 3-71 Ramp 4 Ramp up Time and
Time parameter 3-72 Ramp 4 Ramp Down Time.
NOTICE
If [1] S-ramp Const Jerk is selected and the reference
during ramping is changed, the ramp time may be
prolonged to realize a jerk-free movement, which may
result in a longer start or stop time.
More adjustments of the S-ramp ratios or switching
initiators may be necessary.
MG33MP02
Programming Guide

3-71 Ramp 4 Ramp up Time

Range:
Size
related
*

3-72 Ramp 4 Ramp Down Time

Range:
Size
related
*
3-75 Ramp 4 S-ramp Ratio at Accel. Start
Range:
50 %
*
99 %]
3-76 Ramp 4 S-ramp Ratio at Accel. End
Range:
50 %
*
99 %]
3-77 Ramp 4 S-ramp Ratio at Decel. Start
Range:
50 %
*
99 %]
Danfoss A/S © 10/2018 All rights reserved.
Function:
[ 0.01 - Enter the ramp-up time, which is the
3600 s] acceleration time from 0 RPM to the rated
motor speed n . Select a ramp-up time such
s
that the output current does not exceed the
current limit in parameter 4-18 Current Limit
during ramping. The value 0.00 corresponds
to 0.01 s in speed mode. See ramp-down
time in parameter 3-72 Ramp 4 Ramp Down
Time.
t s x n RPM
acc s
Par . 3 − 71 =
ref RPM
Function:
[ 0.01 - Enter the ramp-down time, which is the
3600 s] deceleration time from the nominal motor
speed n to 0 RPM. Select a ramp-down
s
time such that no overvoltage occurs in the
inverter due to regenerative operation of the
motor, and such that the generated current
does not exceed the current limit set in
parameter 4-18 Current Limit. The value 0.00
corresponds to 0.01 s in speed mode. See
ramp-up time in parameter 3-71 Ramp 4
Ramp up Time.
t s x n RPM
dec s
Par . 3 − 72 =
ref RPM
Function:
[ 1 - Enter the proportion of the total ramp-up time
(parameter 3-71 Ramp 4 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:
[ 1 - Enter the proportion of the total ramp-up time
(parameter 3-71 Ramp 4 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:
[ 1 - Enter the proportion of the total ramp-down
time (parameter 3-72 Ramp 4 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.
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