Ramp 2; Ramp 1 Ramp Down Time; Ramp 1 S-Ramp Ratio At Accel. Start; Ramp 2 Ramp Up Time - Danfoss VLT AutomationDrive FC 302 Programming Manual

Parameter Descriptions

3-42 Ramp 1 Ramp Down Time

Range: Function:
Size [ 0.01 - Enter the ramp-down time, that is the
related 3600 s] deceleration time from the synchronous
*
motor speed n
down 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 3-41 Ramp 1
Ramp Up Time.
Par . 3 − 42 =

3-45 Ramp 1 S-ramp Ratio at Accel. Start

Range: Function:
50 % [ 1 - Enter the proportion of the total ramp-up time
*
99 %] (parameter 3-41 Ramp 1 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 occurring in the
application.
3-46 Ramp 1 S-ramp Ratio at Accel. End
Range: Function:
50 % [ 1 - Enter the proportion of the total ramp-up time
*
99 %] (parameter 3-41 Ramp 1 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.
3-47 Ramp 1 S-ramp Ratio at Decel. Start
Range: Function:
50 % [ 1 - Enter the proportion of the total ramp-down
*
99 %] time (parameter 3-42 Ramp 1 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.
3-48 Ramp 1 S-ramp Ratio at Decel. End
Range: Function:
50 % [ 1 - Enter the proportion of the total ramp-down
*
99 %] time (parameter 3-42 Ramp 1 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.
MG33MP02
Programming Guide
to 0 RPM. Select a ramp-
s
t s x n RPM
dec s
ref RPM
Danfoss A/S © 10/2018 All rights reserved.

3.4.5 3-5* Ramp 2

To select ramp parameters, see parameter group 3-4* Ramp
1.
3-50 Ramp 2 Type
Option: Function:
Select the ramp type, depending on
requirements for acceleration/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 Acceleration with lowest possible jerk.
Const Jerk
[2] S-ramp S-ramp based on the values set in
Const parameter 3-51 Ramp 2 Ramp Up Time and
Time parameter 3-52 Ramp 2 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.
Additional adjustment of the S-ramp ratios or switching
initiators may be necessary.

3-51 Ramp 2 Ramp Up Time

Range: Function:
Size [ 0.01 - Enter the ramp-up time, that is the
related 3600 s] acceleration time from 0 RPM to the
*
nominal motor speed n
time such 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 3-52 Ramp 2 Ramp Down Time.
Par . 3 − 51 =
3-52 Ramp 2 Ramp Down Time
Range: Function:
Size [ 0.01 Enter the ramp-down time, that is the
related - 3600 deceleration time from the nominal motor
*
s] speed n to 0 RPM. Select a ramp-down time
s
such that no overvoltage occurs in the
frequency converter 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 3-51 Ramp 2 Ramp Up Time.
. Select a ramp-up
s
t s x n RPM
acc s
ref RPM
83
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