Rockwell Automation 20A PowerFlex 70EC/700VC - Manual (Page 68)

64 Position Indexer/Speed Profiler
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], parameter 700 will be set while the homing
routine is running. The drive will ramp to the speed and direction set in [Find Home
Speed], parameter 713 at the rate set in [Find Home Ramp], parameter 714 until the
digital input defined as Home Limit is activated. The drive will then reverse
direction at 1/10th the [Find Home Speed] to the point where the Home Limit
switch activated and stop.
The diagram below shows the sequence of operation for homing to a limit switch
with encoder feedback (without a marker pulse). [Encoder Z Chan], parameter 423
must be set to “Pulse Input” or “Pulse Check.”
Homing to Limit Switch
Homing to Limit Switch w/o 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], parameter 700 will be set while the homing
routine is running. The drive will ramp to the speed and direction set in [Find Home
Speed], parameter 713 at the rate set in [Find Home Ramp], parameter 714 until the
digital input defined as Home Limit is activated. The drive will then decelerate to
zero. If the switch is no longer activated, the drive will reverse direction at 1/10th
the [Find Home Speed] to the switch position and then stop. The Home Limit
switch will be active when stopped.
The diagram below shows the sequence of operation for homing to a limit switch
without encoder feedback.
Homing to Limit Switch (No Feedback)
Position Redefine – When “Pos Redefine” is set, the present position is established
as home and [Units Traveled] is set to zero.
20 25 30 35 40 45 50 55
0
5
10
15
20
25
30
Find Home Command
Start Command
Home Limit Input
At Home
Homing
-50
0
50
100
150
200
250
60 15 65
[Encoder Speed], 415 [Units Traveled], 701 [Dig In Status], 216 [Profile Status], 700
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Find Home Command
Start Command
Home Limit Input
At Home Homing
-50
0
50
100
150
200
20 25 30 45 0 35
[Speed Feedback], 25 [Dig In Status], 216 [Profile Status], 700