3-66 Ramp 3 S-ramp Ratio at Accel. End
Range:
Function:
50 %
*
[ 1 -
99 %]
Enter the proportion of the total ramp-up time
(
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 -
99 %]
Enter the proportion of the total ramp-down
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 -
99 %]
Enter the proportion of the total ramp-down
decel time (
parameter 3-62 Ramp 3 Ramp down
) 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
Const Jerk
Accelerates with lowest possible jerk.
[2]
S-ramp
Const
Time
S-ramp based on the values set in
parameter 3-71 Ramp 4 Ramp up Time
and
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.
3-71 Ramp 4 Ramp up Time
Range:
Function:
Size
related
*
[ 0.01 -
3600 s]
Enter the ramp-up time, which is the
acceleration time from 0 RPM to the rated
motor speed n
s
. Select a ramp-up time such
that the output current does not exceed the
current limit in
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
Par . 3 − 71 =
t
acc
s x n
s
RPM
ref RPM
3-72 Ramp 4 Ramp Down Time
Range:
Function:
Size
related
*
[ 0.01 -
3600 s]
Enter the ramp-down time, which is the
deceleration time from the nominal motor
speed n
s
to 0 RPM. Select a ramp-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
. The value 0.00
corresponds to 0.01 s in speed mode. See
ramp-up time in
.
Par . 3 − 72 =
t
dec
s x n
s
RPM
ref RPM
3-75 Ramp 4 S-ramp Ratio at Accel. Start
Range:
Function:
50 %
*
[ 1 -
99 %]
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.
3-76 Ramp 4 S-ramp Ratio at Accel. End
Range:
Function:
50 %
*
[ 1 -
99 %]
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.
3-77 Ramp 4 S-ramp Ratio at Decel. Start
Range:
Function:
50 %
*
[ 1 -
99 %]
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.
Parameter Descriptions
Programming Guide
MG33MP02
Danfoss A/S © 10/2018 All rights reserved.
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Содержание VLT AutomationDrive FC 302
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