Guineafowl's latest activity

You had it right here: This means a VFD should tolerate running a much smaller motor, so higher-resistance windings, than it’s...

You’re right about the megger. I’d normally do a check as a general precaution on any old motor, especially if I’ve been fiddling with...

Re: windings, I’d be checking the insulation resistance, if you have access to a megger. Sanity check - does the VFD output voltage...

Thanks for that link. We have a couple of similar websites here in the USA: https://www.owwm.org/ and vintagemachinery.org.

The four-speed motor is quite an impressive feature, given the more common pulley arrangement for speed changes. There’s a short article...

No reversing switch. This is a wood lathe, so there is little likelihood of threadcutting.

I’ve just re-read the thread. Sorry, Baluncore, I missed that you’d already mentioned the compass trick. I take your point about this...

I’m not sure what you’re driving at there ^. Are you trying to equate the number of stator slots with pole number? For three phase...

Without a current-limited supply you’d risk overheating the windings, so perhaps careful experimentation with a 12V automotive bulb in...

If it’s any help, it looks like your two Dahlanders are: 1. 3600-1800 switching 2 to 4-pole 2. 1200-600 switching 6 to 12-pole. I’ve...

Isn’t the full-load rms current of 3.12 A a consequence of the effective, or apparent, impedance under these conditions? As far as I can...

Looking at this another way, this link: https://vfds.com/blog/how-do-you-size-a-line-reactor/ suggests the standard for VFD load...

The VFD was expecting to drive an inductive motor. You raised the frequency of the LPF by 470 / 2.2 = 200 times. That explains why the...

8 kHz Configured as per post #35, the caps are in delta and had to be replaced with 2.2 nF, as the 0.47 uF ones were tripping the VFD...

As before, I can’t get triggering when zoomed in (or out). Is it better to zoom in, and keep taking single shots until a decent picture...