Fanuc OMC Multi-Probe Install Best 24VDC Location Help

[13engines]

I'm installing a Renishaw Legacy probing setup on a mid 90's YCM Supermax 3.
MP10 Probe - OMM - MI12 / TS27R Tool Setter - HSI Interface

The machines' ancillary systems seem to be using 24VDC supplied from a backpane connection off the Control Power Supply. The first appearance of a 24VDC line in the Electrical Manual is at the top of a ladder type page with wires 7 (24V) and wire 0 (0V) Unlike all the following pages, there is no reference to where those two wires came from. They just became. I can find no lead-off or start point, although I can find many tiny little #7 connections scattered all over the Relay Board and Operators Panel. The couple of places where it's easy to find and connect to #7 have all been used up and double stacked if you will. I've added other functionalities in the past. Anyway... perhaps TMI.

Below are pictured the two options I've come up with. I think either will work, but curious if those smarter then me can say for sure if one or both of these connections is not advisable, or if one is better then the other for some reason.

The one coming off the beginning of the 24V line supplying the Fanuc Drive and Spindle Systems is super handy as you can see. The MI12 Interface does mention 400ma potential, but I'm thinking that's if every alarm and buzzer was running at the same time, and not normal probing needs. I could be wrong.

The other connection is an unused 24E labeled output coming off the bottom of the OM Contol Power Supply. Connector CP14. This one seems obvious, but I'm thrown a bit by the 24E designation. The photo out of the connection manual suggests it's for a 2nd IO board so that seems usable. I just don't get what the E and no V is about, even though I'm near certain there is 24VDC coming out of that plug.
As super handy as the Motion Control 24V is, it sort of seems like the better option would be the CP14 connection. The last picture is out of the OMC Connection Manual describing it.

Can anyone here offer some advice on why or why not I should use either one? Many thanks for any help on this.

 

[mmeredith0015]

I‘m not familiar with the cabinets of that builder, but typically I stay away from control sourced 24v for probes or any other machine accessories. Many machines I work with have two 24V power supplies, one is “dirty” and is used for machine accessories and valves, the other one is regarded as ”clean” and used only for control related accessories.

Look at a valve or a motor stater for a coolant pump, surely there is some sort of 24VDC system intended for machine accessories.

Edit: Are you absolutely sure there is not an additional power supply? I’m not saying this shouldn’t be done, but I think I would add my own power supply before pulling It from something yellow.

 

[Vancbiker]

I’m of a different opinion. Since the interface box sends a signal into the Fanuc I/O, I avoid using any power not sourced from the control power supply.

 

[13engines]

Look at a valve or a motor stater for a coolant pump, surely there is some sort of 24VDC system intended for machine accessories.

Like I said earlier, I've pretty much used up my easy access 24V connections. This is kind of an old school machine where the Relay Panel is basic cube relays. About 6 or so massive (like Honda 50's) connectors entering on the front and about a zillion 28awg wires or smaller all over the back. The screw connection rail where I have tapped into 24V multiple times is double stacked, which is already against my religion. Plus it couldn't be any harder to get at.

Edit: Are you absolutely sure there is not an additional power supply? I’m not saying this shouldn’t be done, but I think I would add my own power supply before pulling It from something yellow.

I think I'm running with Vancbiker, and by extension, Probe, on this one. I agree with where they're coming from.

I did get my cable with the correct CP14 connector today. (ebay is the place for legacy Fanuc connectors) Sure enough, 24VDC pretty as they come. Still I'm thrown by the 24E designation. I found one reference today (not counting the fuse page below) in a Maintenance Manual that called it External. It is for a 2nd I/O but why the E or External? I think I'm just going to go with it unless someone tells me I best go otherwise. Here are a couple pictures that dive deeper into the connection. Sorta looks okay to me. Thanks for any help. F14 is the fuse for CP14 (24E)

 

[Vancbiker]

24E is for external loads like a probe or other I/O devices that will have connection back to the Fanuc I/O.

 

[13engines]

Well then I guess I'm connecting to the right place. Thank you for the confirmation! Or should I say.. .the 24V FIN signal. :-)