Jog Ramp Time - Danfoss VLT AutomationDrive Programming Manual

Parameter Descriptions
NOTE!
If S-ramp [1] 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:
Application
dependent [Application
*
dependant]
3-72 Ramp 4 Ramp Down Time
Range:
Application
dependent [Application
*
dependant]
3-75 Ramp 4 S-ramp Ratio at Accel. Start
Range:
50 % [Application Enter the proportion of the total
*
dependant] 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 compen-
sation achieved, and thus the lower
the torque jerks in the application.
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FC 300 Programming Guide
Function:
Enter the ramp-up time, i.e., the
acceleration time from 0 RPM to the
rated motor speed n . Choose a
s
ramp-up time such that the output
current does not exceed the current
limit in 4-18 Current Limit during
ramping. The value 0.00 corresponds
to 0.01 sec. in speed mode. See
ramp-down time in 3-72 Ramp 4
Ramp Down Time.
t acc s x n s RPM
Par . 3 − 71 =
ref RPM
Function:
Enter the ramp-down time, i.e., the
deceleration time from the rated
motor speed n to 0 RPM. Choose a
s
ramp-down time such that no
overvoltage 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 4-18 Current Limit. The
value 0.00 corresponds to 0.01 sec. in
speed mode. See ramp-up time in
3-71 Ramp 4 Ramp up Time.
t dec s x n s RPM
Par . 3 − 72 =
ref RPM
Function:
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3-76 Ramp 4 S-ramp Ratio at Accel. End
Range: Function:
50 % [Application Enter the proportion of the total
*
dependant] 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 compen-
sation achieved, and thus the lower
the torque jerks in the application.
3-77 Ramp 4 S-ramp Ratio at Decel. Start
Range: Function:
50 % [Application Enter the proportion of the total
*
dependant] 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 % [Application Enter the proportion of the total
*
dependant] 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:
Application [0.01 - Enter the jog ramp time, i.e., the
dependent 3600.00 s] acceleration/deceleration time
*
between 0 RPM and the rated motor
frequency n
output current required for the given
jog ramp time 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 communi-
cation port. When jog state is
disabled, the normal ramping times
are valid.
. Ensure that the resultant
s
3-41
3 3