What has gone wrong????

[Davek0974]

Spoke to the BOB suppliers, seems the BOB is fried 100%. (:

They also said it was wired wrongly, I had the BOB supply fed from the Z-axis output of the main PSU, apparently that is bad and must be a separate regulated supply for the BOB only.

Anyone know anything about this?

[Clive S]

Spoke to the BOB suppliers, seems the BOB is fried 100%. (:

They also said it was wired wrongly, I had the BOB supply fed from the Z-axis output of the main PSU, apparently that is bad and must be a separate regulated supply for the BOB only.

Anyone know anything about this?

Dave It would be helpful for you to give the model number of the BOB and the type of power supply, Voltage and a wiring diagram of how you have connected it up. Then you might be able to get the correct advise from here. It is difficult for people to have vague information and give proper advise. ..Clive

[Davek0974]

Dave It would be helpful for you to give the model number of the BOB and the type of power supply, Voltage and a wiring diagram of how you have connected it up. Then you might be able to get the correct advise from here. It is difficult for people to have vague information and give proper advise. ..Clive

I can fully understand that, but the diagram is in my head, however its currently like this basically...

1 - I have an 11A smps connected to the three motor drives,

2 - a smaller 24v smps connected to the BOB,

3 - The BOB is a cnc4you.co.uk HG07 unit - Breakout board CNC Stepper Motor 5 Axis Spindle Relay HG08

4 - Another small 24v psu is running the relays for e-stop and limits / torch trigger.

5 - I have used screened cable for all motor leads, this is connected at one end only inside the cabinet to a star ground.

6 - I have connected the Z-axis to the X-axis carriage and then back to the star point.

7 - I have connected the Y-axis gantry to the star point.

8 - The case of the PC is connected to the star point.

9 - All PC leads are fitted with ferrite chokes.

10 - The mains is now filtered at the plug.

11 - The plasma ground lead is clamped to the cutting bed.

12 - The frame of the table (and therefore the cutting bed) is not connected directly to my star point, I am guessing this is catered for by having the cabinet bolted direct?

The whole lot is mounted in a steel cabinet bolted to the machine frame.

[Clive S]

I can fully understand that, but the diagram is in my head, however its currently like this basically...

1 - I have an 11A smps connected to the three motor drives,

2 - a smaller 24v smps connected to the BOB,

3 - The BOB is a cnc4you.co.uk HG07 unit - Breakout board CNC Stepper Motor 5 Axis Spindle Relay HG08

Ok Dave what is the o/p voltage from the 11A p/s. It states on their data sheet that when using a plasma you have to use a separate p/s for the BOB (that is normal anyway).
re this (They also said it was wired wrongly, I had the BOB supply fed from the Z-axis output of the main PSU) if that is the case what is the purpose of the smaller 24V p/s connect to the BOB

In my humble opinion smps are crap for motors and you would have been better off with a toroidal type none regulated.


Don't get despondent there are enough people on here to help out if you give the information that is required ..Clive

[JAZZCNC]

8 - The case of the PC is connected to the star point.

Would take this away as the PC should have it's own path to earth you could be creating a Earth loop here.?

After this I can only suggest you triple check all the wiring and then replace BOB and try again.

One thing you could do is try running the machine then moving the torch away from machine fire it from a distance and see what happens.?