Danfoss VLT AutomationDrive FC 300 Programming Manual page 58

Parameter Descriptions
3-17 Reference Resource 3
Option: Function:
[2] Analog input 54
[7] Frequency input 29
[8] Frequency input 33
[11] Local bus reference
*
[20] Digital pot.meter
[21] Analog input X30-11
[22] Analog input X30-12
[29] Analog Input X48/2
3-18 Relative Scaling Reference Resource
Option: Function:
Select a variable value to be added to the
fixed value (defined in 3-14 Preset Relative
Reference). The sum of the fixed and variable
values (labelled Y in the illustration below) is
multiplied with the actual reference (labelled
X in the illustration below). This product is
then added to the actual reference (X+X*Y/
100) to give the resultant actual reference.
Y
X
This parameter cannot be adjusted while the
motor is running.
[0] No function
*
[1] Analog input
53
[2] Analog input
54
[7] Frequency
input 29
[8] Frequency
input 33
[11] Local bus
reference
[20] Digital
pot.meter
[21] Analog input
X30-11
[22] Analog input
X30-12
[29] Analog Input
X48/2
FC 300 Programming Guide
Resulting
Relative Z
actual
Z=X+X*Y/100
reference
®
MG.33.MB.02 - VLT is a registered Danfoss trademark
3-19 Jog Speed [RPM]
Range:
Application [Application
dependent dependant]
*
3.5.3 Ramps
3-4* Ramp 1
For each of four ramps (parameter groups 3-4*, 3-5*, 3-6*
and 3-7*) configure the ramp parameters: ramp type,
ramping times (duration of acceleration and deceleration)
and level of jerk compensation for S ramps.
Start by setting the linear ramping times corresponding to
the figures.
RPM
P 4-13
High-limit
Reference
n
s
P 4-11
Low limit
P 3-*1
Ramp (X)Up
Time (Acc)
t
acc
If S-ramps are selected then set the level of non-linear jerk
compensation required. Set jerk compensation by defining
the proportion of ramp-up and ramp-down times where
acceleration and deceleration are variable (i.e. increasing or
decreasing). The S-ramp acceleration and deceleration
settings are defined as a percentage of the actual ramp time.
Speed
Ramp (X) S-Ramp
Ratio at Accel.End
Ramp (X) Linear
S-Ramp
Jerk compensated
Ratio at
Accel.End
Ramp (X)
Up Time
Function:
Enter a value for the jog speed
n , which is a fixed output
JOG
speed. The frequency converter
runs at this speed when the jog
function is activated. The
maximum limit is defined in
4-13 Motor Speed High Limit
[RPM].
See also 3-80 Jog Ramp Time.
P 3-*2 Time
Ramp (X) Down
Time (Dec)
t
dec
Ramp (X) S-Ramp
Ratio at Dec.End
Ramp (X)
S-Ramp
Ratio at
Dec.End
Ramp (X)
Down Time
57
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