Danfoss VLT AutomationDrive FC 300 Programming Manual page 71

Parameter Descriptions
3-72 Ramp 4 Ramp Down Time
Range: Function:
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 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 does
®
VLT AutomationDrive Programming Guide
t dec s x n s RPM
ref RPM
.
s
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MG33MG02 - VLT is a registered Danfoss trademark
3-80 Jog Ramp Time
Range: Function:
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 Jog Ramp Time
t jog s x n s RPM
Par . 3 − 80 =
jog 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 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)
69
3