Guineafowl's latest activity

If in V/f mode, as you state, the VFD will automatically lower the output voltage as you drop the frequency. As far as I can see...

I agree, set the motor rated voltage to what it says on the plate. For the 600 rpm mode problem (and maybe the others), It might be...

As you say, the motor plate doesn’t tell you much. Is it still limited to 30 Hz speed?

I can’t open this. I’ve had a look through the manual. I assume this drive was new, and not secondhand, and for the US market...

If you haven’t input the number of poles (12), then the drive shouldn’t be able to display an accurate speed, so I assume the output...

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...