3-52 Ramp 2 Ramp Down Time
Range:
Function:
Par . 3 − 52 =
t
dec
s x n
s
RPM
ref RPM
3-55 Ramp 2 S-ramp Ratio at Accel. Start
Range:
Function:
50 %
*
[ 1 -
99 %]
Enter the proportion of the total ramp-up time
(
parameter 3-51 Ramp 2 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.
3-56 Ramp 2 S-ramp Ratio at Accel. End
Range:
Function:
50 %
*
[ 1 -
99 %]
Enter the proportion of the total ramp-up time
(
parameter 3-51 Ramp 2 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.
3-57 Ramp 2 S-ramp Ratio at Decel. Start
Range:
Function:
50 %
*
[ 1 -
99 %]
Enter the proportion of the total ramp-down
time (
parameter 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 %
*
[ 1 -
99 %]
Enter the proportion of the total ramp-down
time (
parameter 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.
3.4.6 3-6* Ramp 3
Configure ramp parameters, see
parameter group 3-4*
Ramp 1
.
3-60 Ramp 3 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
3-60 Ramp 3 Type
Option:
Function:
[1]
S-ramp
Const Jerk
Accelerates with lowest possible jerk.
[2]
S-ramp
Const
Time
S-ramp based on the values set in
parameter 3-61 Ramp 3 Ramp up Time
and
parameter 3-62 Ramp 3 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.
Extra adjustment of the S-ramp ratios or switching
initiators may be necessary.
3.4.7 3-61 Ramp 3 Ramp up Time
3-61 Ramp 3 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
nominal 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 3-62 Ramp 3 Ramp down Time
3-62 Ramp 3 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 − 62 =
t
dec
s x n
s
RPM
ref RPM
3-65 Ramp 3 S-ramp Ratio at Accel. Start
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 increases. The
larger the percentage value, the greater the
jerk compensation achieved, and thus the
lower the torque jerks in the application.
Parameter Descriptions
VLT
®
AutomationDrive FC 301/302
84
Danfoss A/S © 10/2018 All rights reserved.
MG33MP02
3
3
Содержание VLT AutomationDrive FC 302
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