Deckel gk21 HP, wiring and VFD

Briggs153 · Feb 21, 2018

Hey guys I’m new here and also new to machining all Together. I recently bought a deckel gk21. It’s 3 phase and I currently only have 220v in my shop. I was told I could just get a VFD to make It a 3phase to single phase. Also was Told to get a vfd with more amps then the motor puts out along with matching HP. There is not info about how much HP this motor has. What are your recommendations on this? All and any help is welcome. Thank you very much. Sorry don’t know how to add pics

3 phase 220v
Operating voltage 115v
Max operating current 2.4A
60 cycle (60hz?)

ballen · Feb 21, 2018

Call Harold or Sean at Dealers Electric Electric Motors | Motor Controls | VFD | AC Drive. No relation, but I have bought 3 small Teco VFDs from them over the past seven years. Low prices, fast competent service, all three still work perfectly.

Your Deckel is a nice machine, please post some pictures once you have figured out how to.

Porsche Nut · Feb 22, 2018

Pretty sure your GK21 has a 2 speed motor in it. Mine does. Bit harder to just run a vfd

Briggs153 · Feb 22, 2018

Porsche Nut said:
Pretty sure your GK21 has a 2 speed motor in it. Mine does. Bit harder to just run a vfd

So what do you think I should do? Where can I find some info? Do you know?

mTeryk · Feb 22, 2018

Google is your friend. There is a ton of info on the web. First off you do have enough info to calculate the horsepower all you need is volts, amps and rpm ... or you could do a web search.

If it is a two speed motor, most people just use the high speed windings and use the VFD to slow things down. You could also use a rotary phase converter which is pretty much plug and play as opposed to using a VFD, which will require some study and wiring to get things right. Rotaries have their own drawbacks, however.

Once again, Google is your friend. Read some write-ups from others who have done what you want to do. It's not that difficult once you wrap your brain around the fundamentals but without that understanding you won't understand any recommendations people might make.

T

Briggs153 · Feb 22, 2018

mTeryk said:
Google is your friend. There is a ton of info on the web. First off you do have enough info to calculate the horsepower all you need is volts, amps and rpm ... or you could do a web search.

If it is a two speed motor, most people just use the high speed windings and use the VFD to slow things down. You could also use a rotary phase converter which is pretty much plug and play as opposed to using a VFD, which will require some study and wiring to get things right. Rotaries have their own drawbacks, however.

Once again, Google is your friend. Read some write-ups from others who have done what you want to do. It's not that difficult once you wrap your brain around the fundamentals but without that understanding you won't understand any recommendations people might make.

T

So my biggest issue is how do i find out if it’s a 2 speed motor? Is Hadley has any info on the motor but what i provided in the original post.

Iv done some research but it’s all Giberish to me lol. I’ll see what o can find

AlfaGTA · Feb 22, 2018

Suggest you post your question on the "Transformers,Phase Converters and VFD's" forum.
Your's is not a Deckel specific question but rather an electrical/motor/converter question.
There are smart folks here , but there is perhaps a better pool of electrical wizards there.....They will be able to easily point you in the proper direction and help with specific details.
Be sure to tell folks that the machine is fitted with a two speed motor (if indeed it is. The factory power switch should give you a good clue as to whether it is so fitted of not) .

Phase converters and VFD's both have their own specific requirements and issues. Its not a case of "best" but rather what works better for you, your abilities and situation.
Cheers Ross

bikepete · Feb 22, 2018

(1) The motor will very likely have a nameplate. Take a clear well lit in focus photo of it so that all text is legible - it may need cleaning off.

(2) Where the wires go into the motor there is probably an easily removed terminal cover. Take it off and take clear well lit etc. photos from several angles of all the terminals and connected wires.

(3) Post all of the above, and a pic of the whole machine (helps people get enthused about helping you) on the phase converter forum as recommended by Ross. There'll be an FAQ somewhere on this forum about posting pics if you can't figure it out.

That should get you some useful replies.

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Deckel gk21 HP, wiring and VFD

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