Chinese BOB controlling VFD *AND* liquid cooling?

[Daryl_bee]

Hi

This is my first post on my first CNC build. This may be a simple question but I can't find an explicity stated answer for it online.

I have a standard chinese BOB. The one with a blue relay. From what I understand I can control the spindle's VFD with a ON/OFF pair on the side terminal block and a 0-10V pair (speed) also on the side terminal block. See my PIC. On the bottom terminal block there is a relay output (P17). I can't find what this is switching but can only assume it is the BOB's PC 5V/GND, correct? If so what current could it handle reliably? If possible I want to use it to trigger an opto isolated 5V relay board to switch on a pump and fan for my spindle's liquid cooling. Is there a "common" pin to go with it (P17) or do I have to sink a seperate relay board ground to trigger the relay board to switch states?

Thanks for your patience!
Daryl_bee

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[jalessi]

Daryl,

A solid state relay would be an easy solution.

See attached link:

https://www.ebay.com/itm/Output-24V-...oAAOSwiLdV~3hX

Welcome to the Zone,

Jeff...

[ger21]

I think there's a jumper, to use either the relay, or pin 17 as an output. You can't use both.

[Al_The_Man]

Why not look at using the outputs on the VFD and set the VFD output parameter to either At-Zero-Speed or Up-to-Speed (at frequency).
Al.

[Daryl_bee]

Hi

I really just want to know if I could use the VFD signals as shown (on my PIC) and use P17 to be the relay board trigger and if so how much current.

My understanding (feeble as it is) is the jumper either allows P17 to be part of a B-axis stepper driver "B Direction" (Jumper OFF) or to be used as a relay output (Jumper ON - what I want). I'd like to use the latter if possible (?) as my cooling power is within inches of my BOB before it will go out via a shielded twisted pair cable on the opposite side of the machine as the VFD (avoid noise). My back-up would be to use the VFD but I'd prefer to route my CU power away from the noisy VFD area if possible to limit my noise exposure. I *will* be using shielded VFD cable but I'm still very cautious about going in there for non-essential VFD stuff unless I have to. Also there's several CU Power lines I'm planning - +12V Pump, +12VFan1, +12VFan2, +5Vtemp meter, so the VFD route might be tricky whereas my BOB, possible relay board and +12V/+5V power supply are together within an 8" circle.

[ger21]

Read my post again. You can either use P17, or the relay, but not both.

[Daryl_bee]

Hi

Thanks so much! You're absolutely right. I can see on a pic of the secondary side of the board the relay is a 1 form C (one contact set). I've always dealt with 2 form C's before and somehow got it stuck in my head this was similar. I think I have figured out what I should do now. Instead of sending that relay contact to the VFD on/off (as in my PIC) I can send it instead to trigger a local 4 channel relay board and use one output channel to switch the VFD as before, one channel to switch my 12V (Fans/Pump), one channel to switch my 5V (Meter) and maybe one for a future vacuum trigger or something. This way when I get Mach3 to start the spindle via that one output, SHAZAM! the spindle starts spinning, the pump flows, the fan blows, the meter shows and maybe the vaccum goes too. :-) YES!!