Ramp 1; Virtual Master Max Ref; Ramp 1 Type; Ramp 1 Ramp Up Time - Danfoss VLT AutomationDrive FC 302 Programming Manual

Parameter Descriptions

3-27 Virtual Master Max Ref

Range:
3 3
3-28 Master Offset Speed Ref
Range:
1500 [0 -
RPM 65000
*
RPM]

3.4.4 3-4* Ramp 1

For each of the 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 compensation for S-ramps.
Start by setting the linear ramping times corresponding to
Illustration 3.25 and Illustration 3.26.
R PM
P 4-13
H igh-limit
R ef er enc e
n
s
P 4-11
L o w limit
Illustration 3.25 Linear Ramping Times
If S-ramps are selected, 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 (that is,
increasing or decreasing). The S-ramp acceleration and
deceleration settings are defined as a percentage of the
actual ramp time.
82
VLT
Function:
or fieldbus. Use parameter group 3-6* Ramp 3 to
configure acceleration and deceleration.
Function:
NOTICE
This parameter is only available with
software version 48.XX.
Enter the speed reference for changing the
master offset in synchronization mode. To
ensure compatibility with software versions
48.01 and 48.10, this parameter is only
active when parameter 3-02 Minimum
Reference is set to 0.
P 3-*1 P 3-*2
R amp ( X) Up R amp ( X) D o wn
T ime ( A c c) T ime (D ec)
t t
a cc dec
Danfoss A/S © 10/2018 All rights reserved.
®
AutomationDrive FC 301/302
Speed
Ramp (X) S-Ramp
Ratio at Accel.End
Ramp (X)
S-Ramp
Ratio at
Accel.End
Illustration 3.26 Linear Ramping Times

3-40 Ramp 1 Type

Option:
[0] Linear
*
[1] S-ramp
Const
Jerk
[2] S-ramp
Const
Time

3-41 Ramp 1 Ramp Up Time

Range:
T ime
Size
related 3600 s]
*
Linear
Jerk compensated
Ramp (X)
Up Time
Function:
NOTICE
If [1] S-ramp Const Jerk is selected and
the reference during ramping is changed,
the ramp time may be prolonged to
realize a jerk-free movement, which may
result in a longer start or stop time.
Extra adjustment of the S-ramp ratios or
switching initiators may be necessary.
Select the ramp type, depending on
requirements for acceleration/deceleration.
A linear ramp gives constant acceleration during
ramping. An S-ramp gives non-linear
acceleration, compensating for jerk in the
application.
Acceleration with lowest possible jerk.
S-ramp based on the values set in
parameter 3-41 Ramp 1 Ramp Up Time and
parameter 3-42 Ramp 1 Ramp Down Time.
Function:
[ 0.01 - Enter the ramp-up time, that is the
acceleration time from 0 RPM to the
synchronous motor speed n
up time which prevents the output current
from exceeding the current limit in
parameter 4-18 Current Limit during ramping.
The value 0.00 corresponds to 0.01 s in
speed mode. See ramp-down time in
parameter 3-42 Ramp 1 Ramp Down Time.
t s x n RPM
acc s
Par . 3 − 41 =
ref RPM
Ramp (X) S-Ramp
Ratio at Dec.End
Ramp (X)
S-Ramp
Ratio at
Dec.End
Ramp (X)
Down Time
. Select a ramp-
S
MG33MP02