3-72 Ramp 4 Ramp Down Time
Range: Function:
set in 4-18 Current Limit. The value 0.00
corresponds to 0.01 s in speed mode. See
ramp-up time in 3-71 Ramp 4 Ramp up
Time.
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 (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 (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 (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.
3-78 Ramp 4 S-ramp Ratio at Decel. End
Range: Function:
50 %* [ 1 - 99.
%]
Enter the proportion of the total ramp-down
time (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.
3.5.7 3-8* Other Ramps
3-80 Jog Ramp Time
Range: Function:
Size
related*
[0.01 -
3600.00 s]
Enter the jog ramp time, i.e. the
acceleration/deceleration time between 0
RPM and the rated motor frequency n
s
.
Ensure that the resultant output current
required for the given jog ramp time
3-80 Jog Ramp Time
Range: Function:
does not exceed the current limit in
4-18 Current Limit. The jog ramp time
starts upon 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
Par
. 3 − 80 =
t
jog
s
x
n
s
RPM
Δ
log
speed
(
par
. 3 − 19
)
RPM
3-81 Quick Stop Ramp Time
Range: Function:
Size
related*
[0.01 -
3600.00 s]
Enter the quick–stop ramp-down time, i.e.
the deceleration time from the
synchronous motor speed to 0 RPM.
Ensure that no resultant over-voltage will
arise 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 4-18 Current Limit). Quick-stop is
activated by means of a signal on a
selected digital input, or via the serial
communication port.
Parameter Descriptions
VLT
®
AutomationDrive Programmming Guide
MG33ME02 - VLT
®
is a registered Danfoss trademark 63
3
3
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