Mach3 VFD PWM signal...

[Davek0974]

will try that tomorrow, thanks

[JAZZCNC]

What you using for Speed control Dave.? On-board Bob or separate board.?

[Davek0974]

Its a cnc4you CP 0-10v breakout board with on-board converter.

I fired the question at cnc4you and just got a reply - yes i should be able to measure 0-10v there, so i have no idea why i cannot.

[Graeme]

Make sure you don't have the lead plugged into the current connectors marked "A" or "mA" - For voltage they should be plugged into "COM" and "V". Its very easy to forget.
Graeme

[Clive S]

Make sure you don't have the lead plugged into the current connectors marked "A" or "mA" - For voltage they should be plugged into "COM" and "V". Its very easy to forget.
Graeme

Yes but good meters don't let you do that. But good point. Dave: By capacitance I meant from the leads they act as a capacitor if they are very close.

[Davek0974]

Thanks guys,

Definitely on the volts, this meter only has three sockets - V/mA, Com, 10A and i only used the Com and V/mA ones 99% of the time.

I can't see lead capacitance having any effect here, surely it should be a measurable 0 to 10v Dc signal going to the VFD?

I know 4-20mA can be a pain to measure sometimes unless its loaded properly but 0-10v?

[JAZZCNC]

I fired the question at cnc4you and just got a reply - yes i should be able to measure 0-10v there, so i have no idea why i cannot.

Sounds like you have dodgy Bob to me.? 100% should be able to measure the Voltage coming out the speed Controller.

[Davek0974]

Bugger, sounds about right for my luck.

But then how the heck does it manage to work at all?

Might be worth putting the 'scope on it?

[Clive S]

Bugger, sounds about right for my luck.

But then how the heck does it manage to work at all?

Might be worth putting the 'scope on it?

A telescope won't help

[cropwell]

I think he meant a proctoscope