Danfoss VLT AutomationDrive FC 302 Programming Manual page 69

Parameter Descriptions
3-17 Reference Resource 3
Option: 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
3-18 Relative Scaling Reference Resource
Option: Function:
NOTICE
This parameter cannot be
adjusted while the motor is
running.
Select a variable value to be added to
the fixed value (defined in
parameter 3-14 Preset Relative Reference).
The sum of the fixed and variable
values (labelled Y in Illustration 3.24) is
multiplied with the actual reference
(labelled X in Illustration 3.24). This
product is then added to the actual
reference (X+X*Y/100) to give the
resultant actual reference.
Y
X
Illustration 3.24 Resultant Actual
Reference
[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
®
VLT AutomationDrive FC 301/302 Programming Guide
Resulting
Relative Z
actual
Z=X+X*Y/100
reference
MG33MI02 - Rev. 2013-11-20
3-19 Jog Speed [RPM]
Range: Function:
Size [ 0 - Enter a value for the jog speed n
related par. 4-13 is a fixed output speed. The frequency
*
RPM] converter runs at this speed when the jog
function is activated. The maximum limit is
defined in parameter 4-13 Motor Speed High
Limit [RPM].
See also parameter 3-80 Jog Ramp Time.
3.5.3 Ramps
3-4* Ramp 1
For each of 4 ramps (parameter groups 3-4* Ramp 1, 3-5*
Ramp 2, 3-6* Ramp 3 and 3-7* Ramp 4) configure the ramp
parameters: ramp type, ramping times (duration of
acceleration and deceleration) and level of jerk compen-
sation for S ramps.
Start by setting the linear ramping times corresponding to
Illustration 3.25 and Illustration 3.26.
RPM
P 4-13
High-limit
Reference
n
s
P 4-11
Low limit
P 3-*1
Ramp (X)Up
Time (Acc)
t
acc
Illustration 3.25 Linear Ramping Times
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.
, which
JOG
3
P 3-*2 Time
Ramp (X) Down
Time (Dec)
t
dec
67
3