
C-24
Application Notes
•
Position Redefine
When “Pos Redefine” is set, the present position is established as
Home and [Units Traveled] is set to zero.
•
Disable Homing Requirement
If a home position is not required, the routine can be disabled by
clearing [Alarm Config 1], bit 17 (Prof SetHome) to “0”. This will
disable the alarm from being set when Pos/Spd Profile mode is
configured in [Speed/Torque Mod] and will set the present position
as Home.
Once Homing is complete the Find Home command must be
removed to allow the profile to be run. If the Find Home command is
not removed, when the drive is started the routine will see that it is At
Home and the drive will stop.
Example 1
Five Step Velocity Profile (Time-Based and Encoder-Based)
The first three steps are “Time” steps followed by an “Encoder Abs” step
to zero and then an “End” step. For each Time step the drive ramps at
[Step x AccelTime] to [Step x Velocity] in the direction of the sign of
[Step x Velocity]. The drive then decelerates at [Step X DecelTime] to
zero. The [Step X Value] is programmed to the desired time for the total
time of the accel, run and decel of the step. Each step has a 1 second time
programmed in [Step X Dwell] which is applied to the end of each step.
After the dwell time expires, the profile transitions to the next step. The
absolute step is used to send the profile back to the home position. This
is done by programming [Step 4 Value] to zero.
Figure C.8 Time Example
5s
5s
5s
Step 1
Step 2
Step 3
Time
Step 4
Step 5
-450
-150
-250
-350
50
-50
150
250
350
0
25
20
15
10
5
35
30
40
45
50
33
Note: there is no "At Position"
indication when using timed steps
53
73
93
153
113
133
13
[Encoder Speed], 415
[Units Traveled], 701
Current Step
[Profile Status], 700
Содержание Allen-Bradley PowerFlex 700 B Series
Страница 1: ...Adjustable Frequency AC Drive Series B Firmware Versions 4 001 User Manual www abpowerflex com ...
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Страница 118: ...3 78 Programming and Parameters Notes ...
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