Danfoss VLT AutomationDrive FC 300 Programming Manual page 67

Parameter Descriptions
3-17 Reference Resource 3
Option: Function:
[22] Analog input X30-12
[29] Analog Input X48/2
3-18 Relative Scaling Reference Resource
Option: Function:
NOTE
This parameter cannot be adjusted
while the motor is running.
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
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
3-19 Jog Speed [RPM]
Range: Function:
Size [ 0 - par. Enter a value for the jog speed n
related 4-13 RPM] which is a fixed output 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].
®
VLT AutomationDrive Programming Guide
Resulting
Relative Z
actual
Z=X+X*Y/100
reference
,
JOG
®
MG33MG02 - VLT is a registered Danfoss trademark
3-19 Jog Speed [RPM]
Range: Function:
See also 3-80 Jog Ramp Time.
3.5.3 Ramps
3-4* Ramp 1
For each of four 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.
Speed
Ramp (X) S-Ramp
Ratio at Accel.End
Linear
Ramp (X)
S-Ramp
Jerk compensated
Ratio at
Accel.End
Ramp (X)
Up Time
Illustration 3.26 Linear Ramping Times
3
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
65
3