Danfoss VLT AutomationDrive FC 302 Programming Manual page 74

Parameter Descriptions
3-81 Quick Stop Ramp Time
Range:
3 3
Illustration 3.28 Quick Stop Ramp Time
3-82 Quick Stop Ramp Type
Option:
[0] Linear
*
[1] S-ramp Const
Jerk
[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
*
%]
72
Function:
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 (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.
®
VLT AutomationDrive FC 301/302 Programming Guide
3.5.8 3-9* Digital Pot.Meter
The digital potentiometer enables increase or decrease of
the actual reference by adjusting the set-up of the digital
inputs using the functions Increase, Decrease or Clear. To
activate the function, at least one digital input must be set
up to Increase or Decrease.
Speed
Inc
Illustration 3.29 Increase Actual Reference
Time
Speed
Dec
Inc
Illustration 3.30 Increase/Decrease Actual Reference
3-90 Step Size
Range:
0.10
%
*
3-91 Ramp Time
Range:
1 [0 -
s 3600 s]
*
MG33MI02 - Rev. 2013-11-20
P 3-95
P 3-95
Function:
[0.01 - Enter the increment size required for
200 %] INCREASE/DECREASE, as a percentage of the
synchronous motor speed, n
DECREASE is activated, the resulting
reference is increased/decreased by the
amount set in this parameter.
Function:
Enter the ramp time, i.e. the time for adjustment of
the reference from 0% to 100% of the specified
digital potentiometer function (Increase, Decrease
or Clear).
If Increase/ Decrease is activated for longer than
the ramp delay period specified in
parameter 3-95 Ramp Delay the actual reference
isramped up/down according to this ramp time.
The ramp time is defined as the time used to
adjust the reference by the step size specified in
parameter 3-90 Step Size.
Time (s)
Time (s)
. If INCREASE/
s