Fanuc Retrofit - What are "OP" "R11" "S11" etc

[eriksalo]

Hi All;

I'm retrofitting a 1980's VMC with Fanuc 6MB electronics. The retrofit is going great, Jon from Pico has been very helpful. I've hit the stage of the project were I'm reverse engineering all the sensors and relays, etc. I have Fanuc documentation but no machine documentation. Hundreds of connections! There are several recurring wire labels I don't understand. Can anyone help with what these "common" wire labels mean?

"OP" What is this? It seem to work like ground but is not Gnd
"OL" Same as above
"S11" This is used lots of places, I think it's power of some type
"R11" Same as above
"+24P" This is clearly 24 Volts but what's the P versus N?
"+24N" This is clearly 24 Volts but what's the P versus N?

Thanks!

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[memoryman]

"+24P" This is clearly 24 Volts but what's the P versus N? P= PLUS
"+24N" This is clearly 24 Volts but what's the P versus N? N=NEGATIVE

[zavateandu]

R11 as S11 should be 220v as you must have T11 aswell
if not that i should think is 110v for R and S

you just have a lot of actuators on triphase 220v for pump and some 110V for electrovalves

[memoryman]

""OP" What is this? It seem to work like ground but is not Gnd" what do you mean by 'work like ground'? Do you measure 0 Ohms to gnd? It could be the neutral for 3phase.

[eriksalo]

I spent some quality time in the control box with my Fluke multimeter and ohm'd out some clues.

OP and OL and indeed "neutral" for the +24V DC. OP comes off a full wave bridge rectifier 180 degrees across the bridge from +24P. I assume OP is then tied to chassis ground in one (and only one) place to avoid ground loops.

S11 and R11 are 100VAC. Japanese...

S11/R11, OP/OL and +24P/+24N are each isolated from one another. I'm guessing this is also for ground loops but that's just a guess. Anyone know why this is?

It's a beautiful old machine, such care in design and wiring.