Ramp 3 Type; Ramp 2 S-Ramp Ratio At Accel. Start; Ramp 2 Ramp Down Time; Ramp 2 S-Ramp Ratio At Decel. End - Danfoss VLT AutomationDrive Programming Manual

Parameter Descriptions
NOTE!
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.
Additional adjustment of the S-ramp ratios or switching
initiators may be necessary.
3-51 Ramp 2 Ramp up Time
Range:
Application
dependent [Application
*
dependant]

3-52 Ramp 2 Ramp down Time

Range:
Application
dependent [Application
*
dependant]

3-55 Ramp 2 S-ramp Ratio at Accel. Start

Range:
50 % [Application Enter the proportion of the total
*
dependant] ramp-up time (3-51 Ramp 2 Ramp up
Time) in which the acceleration torque
increases. 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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FC 300 Programming Guide
Function:
Enter the ramp-up time, i.e., the
acceleration time from 0 RPM to the
rated motor speed n . Choose a
s
ramp-up time such that the output
current does not exceed the current
limit in 4-18 Current Limit during
ramping. The value 0.00 corresponds
to 0.01 sec. in speed mode. See
ramp-down time in 3-52 Ramp 2
Ramp down Time.
t acc s x n s RPM
Par . 3 − 51 =
ref RPM
Function:
Enter the ramp-down time, i.e., the
deceleration time from the rated
motor speed n to 0 RPM. Choose a
s
ramp-down time such that no
overvoltage 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 sec. in
speed mode. See ramp-up time in
3-51 Ramp 2 Ramp up Time.
t dec s x n s RPM
Par . 3 − 52 =
ref RPM
Function:
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3-56 Ramp 2 S-ramp Ratio at Accel. End
Range: Function:
50 % [Application Enter the proportion of the total
*
dependant] ramp-up time (3-51 Ramp 2 Ramp up
Time) in which the acceleration torque
decreases. The larger the percentage
value, the greater the jerk compen-
sation achieved, and thus the lower
the torque jerks in the application.
3-57 Ramp 2 S-ramp Ratio at Decel. Start
Range: Function:
50 % [Application Enter the proportion of the total
*
dependant] ramp-down time (3-52 Ramp 2 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.

3-58 Ramp 2 S-ramp Ratio at Decel. End

Range: Function:
50 % [Application Enter the proportion of the total
*
dependant] ramp-down time (3-52 Ramp 2 Ramp
down 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.
3.5.5 3-6* Ramp 3
Configure ramp parameters, see 3-4*.

3-60 Ramp 3 Type

Option: 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.
[0] Linear
*
[1] S-ramp Accelerates with lowest possible jerk.
Const Jerk
[2] S-ramp S-ramp based on the values set in 3-61 Ramp
Const Time 3 Ramp up Time and 3-62 Ramp 3 Ramp down
Time
3 3
3-39