Sinumerik 810 Axis limit alarm reset. PLEASE HELP

[rjones125]

I have a Harig Surface grinder with an Sinumerik 810 controller. Has been working just fine. This last week I was jogging it around. Went to reference it as I do and I got a Y+ axis over limit code that would not clear, ergo, I cannot reference it and run programs, now it wont even jog with the buttons. I ended up finding and pushing/holding and various things to the red axis reset buttons in the power box behind the machine, two little boxes for the two axis's. Now I have alarms for all Y+ Z+ and Z- hardware limit. 7006 7008 and 7009. I moved everything to center with the hand wheels, powered off, held buttons while powering up moving etc.. Is there some simple thing I am missing here for resetting the limit switches? Are there some user parameters I can look at?. I am lost when it comes to the hardware issues.
The machine is a bridgeport style Harig CNCII from the early 80's. All the PLC and NC Data has not been altered....

Thanks Robert

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[POSTIGLIONE73]

Hi robert, sorry for my english, but use google translator.
Your problem is very simple, it has practically moved something in the reset.
Or the contact of the zero limit switches in advance, delay or maybe it does not work or for some reason the zero mark is not in the same position.
The cn once received the bit of f.c. Of zero performs an axis reversal.
Is this reversal occurring?
Then check that the plc signals of the f.c. Of zero arrives at cn, if all ok you can fix the problem by rotating the Z axis encoder half way and try.