I know exactly what your problem is as I have seen it many times. Your problem is with indexer 1 (the cylinder which runs up and down and actuates feeders on side 1). At each end of the travel of the indexer is a micro switch hidden down below the bearing rail. These are the limit switches i.e. "positive limit reached" means it triggered the limit switch at the back end of it's travel.
Mounted with the front micro switch is a photo sensor, this is the home sensor for the indexer.
The homing routine for the indexer is that it should move towards the front of the machine until it triggers the photo sensor. Then it should creep back slowly until it _just_ clears the sensor then stop - that is the home position.
While is it creeping it sounds horrible as you describe but this is normal, and it should only creep for a second or two before clearing the sensor.
Your problem is that the photo sensor for that side is blocked all the time, probably with grease if you have been cleaning around the bearing rail area.
When you hit the home button, the machine thinks the indexer is already at the front, blocking the sensor, so it creeps backwards trying to clear the sensor, but then it keeps creeping until it either gets the whole way to the back of the machine and hits the positive limit switch, or the homing routine times out.
You need to find the black plastic photo sensor (similar to the ones you can see above the vision cameras) at the front of the indexer rail and clean any grease or debris from it. If it is too contaminated with grease, it may be necessary to replace the sensor before it will be reliable.
The last software version was 4.6.10
For diagnosys you can view sensor inouts in a utility called "intest". Depending on your software version, you access intest either by exiting to DOS and type "3S -t" or exit to DOS, change to the UTILITY directory, then type "Intest3s"
It's a very straightforward fix, apart from it is awkward to reach in there, especially on side 1 as the vision strobe is in the way...
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