3-62 Ramp 3 Ramp-down Time
Range: Function:
corresponds to 0.01 s in speed mode. See
ramp-up time in parameter 3-61 Ramp 3
Ramp-up Time.
Par . 3 − 62 =
t
dec
s xn
s
RPM
ref RPM
3-70 Ramp 4 Type
Option: Function:
Select the ramp type, depending on
requirements for acceleration and deceleration. A
linear ramp will give constant acceleration during
ramping. An S-ramp will give 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 in order 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.
3-71 Ramp 4 Ramp-up Time
Range: Function:
Size
related*
[ 0.01 -
3600 s]
Enter the ramp-up time, i.e. the acceleration
time from 0 RPM to the rated motor speed
n
s
. Choose a ramp-up time such that the
output current does not exceed the current
limit in parameter 4-18 Current Limit 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 Time.
Par . 3 − 71 =
t
acc
s xn
s
RPM
ref RPM
3-72 Ramp 4 Ramp-down Time
Range: Function:
Size
related*
[ 0.01
- 3600
s]
Enter the ramp-down time, i.e. the
deceleration time from the rated motor
speed n
s
to 0 RPM. Choose a ramp-down
time such that no over-voltage arises in the
inverter due to regenerative operation of the
motor, and such that the generated current
does not exceed the current limit set in
3-72 Ramp 4 Ramp-down Time
Range: Function:
parameter 4-18 Current Limit. The value 0.00
corresponds to 0.01 s in speed mode. See
ramp-up time in parameter 3-71 Ramp 4
Ramp-up Time.
Par . 3 − 72 =
t
dec
s xn
s
RPM
ref RPM
3-80 Jog Ramp Time
Range: Function:
Size
related*
[0.01
- 3600
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 does not exceed the current
limit in parameter 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
Figure 6.4 Jog Ramp Time
Par . 3 − 80 =
t
jog
s xn
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, 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
parameter 4-18 Current Limit). Quick-stop is
activated by means of a signal on a
Parameter Descriptions Operating Instructions
MG34M422 Danfoss A/S © Rev. 2013-07-03 All rights reserved. 57
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