3-78 Ramp 4 S-ramp Ratio at Decel. End
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 decreases. The
larger the percentage value, the greater the
jerk compensation achieved, and thus the
lower the torque jerks in the application.
3.4.9 3-8* Other Ramps
3-80 Jog/Homing Ramp Time
Range:
Function:
Size
related
*
[0.01
- 3600
s]
Enter the jog ramp time, that is the
acceleration/deceleration time between 0 RPM
and the rated motor frequency n
s
. Ensure that
the resulting output current required for the
given jog ramp time does not exceed the
current limit in
.
The jog ramp time starts after activation of a
jog signal via the LCP, a selected digital input,
or the serial communication port. When jog
state is disabled, then the normal ramping
times are valid.
130BA070.10
Time
P 3-80
RPM
P 4-13 RPM
high limit
P 1-25
Motor speed
Jog speed
P 3-19
P 3-80
Ramp up
(acc)
Ramp down
(dec)
t jog
t jog
P 4-11 RPM
low limit
Illustration 3.27 Jog Ramp Time
Par . 3 − 80 =
t
jog
s x n
s
RPM
Δ jog speed par . 3 − 19 RPM
3-81 Quick Stop Ramp Time
Range:
Function:
Size
related
*
[0.01 -
3600 s]
Enter the quick–stop ramp-down time, that
is the deceleration time from the
synchronous motor speed to 0 RPM. Ensure
that no resulting overvoltage occurs in the
inverter due to regenerative operation of
the motor required to achieve the given
ramp-down time. Ensure also that the
generated current required to achieve the
given ramp-down time does not exceed
the current limit (set in
3-81 Quick Stop Ramp Time
Range:
Function:
). Quick stop is
activated with a signal on a selected digital
input, or via the serial communication port.
130BA069.10
Time
RPM
P 4-13 RPM
high limit
Reference
P 1-25
Motor speed
low limit
P 4-11 RPM
P 3-81
Qramp
Qstop
Illustration 3.28 Quick Stop Ramp Time
3-82 Quick Stop Ramp 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, compen-
sating for jerk in the application.
[0]
*
Linear
[1]
S-ramp Const
Jerk
[2]
S-ramp Const
Time
3-83 Quick Stop 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.
3-84 Quick Stop 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.
Parameter Descriptions
VLT
®
AutomationDrive FC 301/302
86
Danfoss A/S © 10/2018 All rights reserved.
MG33MP02
3
3
Summary of Contents for VLT AutomationDrive FC 302
Page 2: ......