Electronics for New Machine + Chinese Spindle + VFD

[mturneruk]

Found some maths.... Not sure if it's right.

I (Amps) = P / V


So for my 48V power supply...
600 Watts / 48V = 12.5 Amps Potential...
Is that right. Something tells me it's more complicated than that..

[Clive S]

Found some maths.... Not sure if it's right.

I (Amps) = P / V


So for my 48V power supply...
600 Watts / 48V = 12.5 Amps Potential...
Is that right. Something tells me it's more complicated than that..

That is 12.5 A at 48 volts BUT you are using about 230V so 600/230 = about 2.6A

[mturneruk]

Ahhhh. Right. Thanks Clive.
That's better.

So lets say 3 amps from the PSU controlling stepper motors and i think i read 9 max from a VFD.. ?
So does that mean I could potentially run it all off one plug then with a 13a fuse?
Sorry for the dumbness on my behalf. I had to remind myself how a ground / fuse works earlier.

Getting there...

[Clive S]

Ahhhh. Right. Thanks Clive.
That's better.

So lets say 3 amps from the PSU controlling stepper motors and i think i read 9 max from a VFD.. ?
So does that mean I could potentially run it all off one plug then with a 13a fuse?
Sorry for the dumbness on my behalf. I had to remind myself how a ground / fuse works earlier.

Getting there...

I think you said that you read every word 5 times. It has been said several times that you can power your system from one plug. You really should take the advise from the good people on here all these questions have been asked lots of times.

[mturneruk]

Thanks !
Really getting somewhere now.

So it's decided that I need one power input into my enclosure and split it. Not listening to the bloke that told me I had to run two plugs any more.

So one side of the internal mains split will go to an EMI filter and then to the VFD.
The other side of the split will go directly to the 48V PSU.
One single all in one 10Amp chassis connector / fuse / power switch.
Easy. Job done.

Apart from Emergency stop.
So can anyone confirm why I can't just use an inline mains e-stop button. How does a relay do the job better ?

Thanks massively for your help.
Martin

[mturneruk]

Clive.

Just been trying to work out who the good people are!
I've had so much conflicting advice, it's hard to tell what's real and what isn't.
Found the answer to that now.

NJ. Thanks.
Neale. Thanks. I use those Network plugs to around my house. Will look out for the drop out. Wonder if the EMI filter might stop that.

Thanks
Martin