e
3
0
b
a
1
6
8
.1
1
Ramp (X) S-Ramp
Ratio at Accel.End
Jerk compensated
Ramp (X)
Up Time
Ramp (X)
S-Ramp
Ratio at
Accel.End
Linear
Speed
Ramp (X)
Down Time
Ramp (X)
S-Ramp
Ratio at
Dec.End
Ramp (X) S-Ramp
Ratio at Dec.End
Illustration 44: Linear Ramping Times
Parameter 3-40 Ramp 1 Type
Table 183: Parameter 3-40 Ramp 1 Type
3-40 Ramp 1 Type
Default value: [1] Linear
Parameter type: Option
Setup: All setups
Conversion index: –
Data type: Uint8
Change during operation: True
N O T I C E
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.
Option Name
Description
[0]*
Linear
[1]
S-ramp Const Jerk
Acceleration with lowest possible jerk.
[2]
S-ramp Const Time 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
.
Parameter 3-41 Ramp 1 Ramp Up Time
Table 184: Parameter 3-41 Ramp 1 Ramp Up Time
3-41 Ramp 1 Ramp Up Time
Default value: Size related
Parameter type: Range, 0.01 - 3600 s
Setup: All setups
Conversion index: -2
Data type: Uint32
Change during operation: True
Enter the ramp-up time, that is the acceleration time from 0 RPM to the synchronous motor speed n
S
. Select a ramp-up time which
prevents the output current from exceeding the current limit in
parameter 4-18 Current Limit during ramping
. The value 0.00 corre-
sponds to 0.01 s in speed mode. See ramp-down time in
parameter 3-42 Ramp 1 Ramp Down Time
.
Par . 3 − 41 =
t
acc
s
×
n
s
RPM
ref RPM
AU373327181955en-000101 / 130R1208
112 | Danfoss A/S © 2021.08
Parameter Descriptions
VLT® AutomationDrive EZ FC 321
Programming Guide
