Citizen L20 error codes 4 and 17

[WillRitter]

Hi there,
We just purchased a 1995 Citizen L20 Screw machine with Mitsubishi control. Our electrician just wired it up this morning and on startup I am getting this error:

M02 Need R.P. RTN 0004

I've looked through the machine manual but it is not very helpful when it comes to alarms. Any ideas? I don't have any previous screw machine experience.

[SirDenisNayland]

I don't know the exact alarm by number but deciphering the words your machine needs a reference point return. Again I don't know the control for that particular year model but you should be able to find the procedure in your manual

Cheers

Also make sure you have the three machine manuals, programmers, operators and maintenance, as well as the mistubishi manuals, there should be one dedicated to alarms/parameters

[WillRitter]

Thanks for posting SirDenisNayland,
I dug through my Cincom manual (the seller did provide me with all of the manuals) and found the zero return section which is attached for the next guy looking to fix this. It took a few tries, half of the directions are to turn parameter 9 off which allows you to zero return the axes. Once that was turned off you jog each axis in the negative direction until the dog switch is tripped. I did Xv, Xh and Z on the main and then hit the subspindle button and did Xb and Zb, and then turned parameter 9 back on. Problem fixed.

[SirDenisNayland]

No problem, glad to hear you got it all figured out.

[danrudolph]

Man that manual page reminds me of my old 1984 L16 manual. Actually is alot more clear than the L16 manual.

I still am surprised that I was able to decipher that gibberish. Taught myself how to run it just by the manuals when I was 16. But with no C or sub, have not come across a part I could make on it in the last five years.

The manuals have certainly improved since then, but the machines are much more complex now too.