Danfoss VLT AutomationDrive FC 301 Programming Manual page 82

Parameter Descriptions
3-78 Ramp 4 S-ramp Ratio at Decel. End
Range:
50 % [ 1 -
*
99 %]
3 3
3.5.8 3-8* Other Ramps
3-80 Jog/Homing Ramp Time
Range:
Size [0.01
related - 3600
*
s]
RPM
P 4-13 RPM
high limit
P 1-25
Motor speed
P 3-19
Jog speed
P 4-11 RPM
low limit
Illustration 3.27 Jog Ramp Time
Par . 3 − 80 =
Δ jog speed par . 3 − 19 RPM
3-81 Quick Stop Ramp Time
Range:
Size [0.01 -
related 3600 s]
*
80
VLT
Function:
Enter the proportion of the total ramp-down
time (parameter 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.
Function:
Enter the jog ramp time, i.e. the acceleration/
deceleration time between 0 RPM and the
rated motor frequency n . Ensure that the
s
resulting 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 after 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.
t jog t jog
P 3-80 P 3-80
Ramp up
Ramp down
(acc) (dec)
t s x n RPM
jog s
Function:
Enter the quick–stop ramp-down time, that
is the deceleration time from the
synchronous motor speed to 0 RPM. Ensure
that no resulting overvoltage occurs 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
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®
AutomationDrive FC 301/302
3-81 Quick Stop Ramp Time
Range:
Illustration 3.28 Quick Stop Ramp Time
3-82 Quick Stop Ramp Type
Option:
[0] Linear
*
[1] S-ramp Const
Jerk
Time
[2] S-ramp Const
Time
3-83 Quick Stop S-ramp Ratio at Decel. Start
Range:
50 % [ 1 -
*
99 %]
3-84 Quick Stop S-ramp Ratio at Decel. End
Range:
50 % [ 1 -
*
99 %]
Function:
parameter 4-18 Current Limit). Quick stop is
activated with a signal on a selected digital
input, or via the serial communication port.
RPM
P 4-13 RPM
high limit
Reference
P 1-25
Motor speed
P 4-11 RPM
low limit
P 3-81
Qramp
Qstop
Function:
Select the ramp type, depending on
requirements for acceleration and
deceleration. A linear ramp gives constant
acceleration during ramping. An S-ramp
gives non-linear acceleration, compen-
sating for jerk in the application.
Function:
Enter the proportion of the total ramp-down
time (parameter 3-42 Ramp 1 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.
Function:
Enter the proportion of the total ramp-down
time (parameter 3-42 Ramp 1 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.
Time
MG33ML02