Danfoss VLT AutomationDrive FC 300 Series Programming Manual page 64

Parameter Descriptions
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 =
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 [0.01 - Enter the jog ramp time, i.e. the
related 3600.00 s] acceleration/deceleration time between 0
*
RPM and the rated motor frequency n
Ensure that the resultant output current
required for the given jog ramp time
®
VLT AutomationDrive Programmming Guide
t dec s x n s RPM
ref RPM
.
s
®
MG33ME02 - VLT is a registered Danfoss trademark
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.
RPM
P 4-13 RPM
high limit
P 1-25
Motor speed
P 3-19
Jog speed
P 4-11 RPM
low limit
t jog
P 3-80
Ramp up
(acc)
Illustration 3.27
t jog s x n s RPM
Par . 3 − 80 =
log speed ( par . 3 − 19 ) RPM
Δ
3-81 Quick Stop Ramp Time
Range: Function:
Size [0.01 - Enter the quick–stop ramp-down time, i.e.
related 3600.00 s] 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.
3
t jog Time
P 3-80
Ramp down
(dec)
63
3