Download PowerFlex 700 AC Drives

C-22
Application Notes
zero and then back up to first marker pulse prior to the Home Limit
switch at 1/10 the [Find Home Speed]. When on the marker pulse,
the At Home bit (13) is set in [Profile Status] and the drive is
stopped.
Figure C.5 shows the sequence of operation for homing to a marker
pulse. [Encoder Z Chan], parameter 423 must be set to “Marker
Input” or “Marker Check” for this type of homing.
Figure C.5 Homing to Marker
250
30
Homing
150
20
100
15
50
10
0
2
7
12
17
22
27
32
37
5
-50
-100
Start Command
Find Home Command
[Encoder Speed], 415
•
42
Digital In Status
Encoder Speed
At Home 25
Profile Status
Units Traveled
200
[Profile Status], 700
Home Limit Input
0
[Units Traveled], 701
[Dig In Status], 216
Homing to Limit Switch with Encoder Feedback
When “Find Home” is commanded, the homing routine is run when
a start command is issued. The Homing bit (11) in [Profile Status]
will be set while the homing routine is running. The drive will ramp
to the speed and direction set in [Find Home Speed] at the rate set in
[Find Home Ramp] until the digital input defined as Home Limit is
activated. The drive will then reverse direction at 1/10 the [Find
Home Speed] to the point where the Home Limit switch activated
and stop.
Figure C.6 shows the sequence of operation for homing to a limit
switch with encoder feedback (without a marker pulse). [Encoder Z
Chan] must be set to “Pulse Input” or “Pulse Check.”
Publication 20B-UM002C-EN-P