Mach3 VFD PWM signal...

[Davek0974]

Hi JAZZ,

Just got off the blower to my preferred UK inverter supplier, use them a lot in the day job, well used to anyway ;)

Lengthy chat, helpful as always. Explained exactly what I was seeing and they had never seen that behaviour before!

The fact that I can see 0-10v when disconnected indicates my control is working fine, the big question mark comes from the fact that as soon as you connect the signal to VFD and put a volt meter across it the motor stops as if the 0-10v was being shorted out - no volts are read. This was tested with two meters - a new(ish) Fluke DMM and a 1960's vintage Avo Mark8 - same results both times.

A bit more chat with the VFD guy and as it was not behaving as expected, I decided to bin the Huanyang probably to eBay and ordered a new Schneider Altivar 12 sensorless vector drive for £115.

My main concern was that something clearly was wrong in that VFD and knowing my luck it would end up in fried BOB and possibly more, usually on a Friday afternoon;)

Should be here tomorrow and slot straight in hopefully.

I can't relax when things just don't play together. Possibly the VFD is a clone, or has some minor parts missing from the inputs, expecting everyone to use the front panel pot for speed maybe, who knows.