3-42 Ramp 1 Ramp Down Time
Range:
Function:
Size
related
*
[ 0.01 -
3600 s]
Enter the ramp-down time, that is the
deceleration time from the synchronous
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
parameter 4-18 Current Limit
. The value
0.00 corresponds to 0.01 s in speed mode.
See ramp-up time in
Par . 3 − 42 =
t
dec
s x n
s
RPM
ref RPM
3-45 Ramp 1 S-ramp Ratio at Accel. Start
Range:
Function:
50 %
*
[ 1 -
99 %]
Enter the proportion of the total ramp-up time
(
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 -
99 %]
Enter the proportion of the total ramp-up time
(
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 -
99 %]
Enter the proportion of the total ramp-down
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 -
99 %]
Enter the proportion of the total ramp-down
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.
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
Const Jerk
Acceleration with lowest possible jerk.
[2]
S-ramp
Const
Time
S-ramp based on the values set in
parameter 3-51 Ramp 2 Ramp Up Time
and
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
related
*
[ 0.01 -
3600 s]
Enter the ramp-up time, that 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 3-52 Ramp 2 Ramp Down Time
.
Par . 3 − 51 =
t
acc
s x n
s
RPM
ref RPM
3-52 Ramp 2 Ramp Down Time
Range:
Function:
Size
related
*
[ 0.01
- 3600
s]
Enter the ramp-down time, that 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
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
.
Parameter Descriptions
Programming Guide
MG33MP02
Danfoss A/S © 10/2018 All rights reserved.
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