Help Rewiring VFD?

DavidCAndersen

DavidCAndersen

Joined
Nov 11, 2013
Messages
766
Hi guys,

I recently scored a sweetheart deal on a grinder with VFD. The only downside right now is that it is wired for 220V, and where I currently live (a rental property) bringing a 220 line to my shop area is not feasible.

My question is, would it be possible to reconfigure the VFD to run off 110V power? I've attempted to suss out the answer by reading the manuals, but my limited familiarity with electrical systems is my undoing here.

Attached are some photos. The unit is a TECO JNEV-201-H1.

vfd-220-wiring.jpg vfd-leads-to-motor.jpg vfd-side.jpg vfd-with-motor.jpg
 
The sticker on vfd says input voltage 200-240v so I am guessing it wont work with a 110v input. Somebody with more knowledge will come by soon I hope though.

Would making a 220v drop cord work ? and maybe run it from your dryer.
 
Spalted said:
The sticker on vfd says input voltage 200-240v so I am guessing it wont work with a 110v input. Somebody with more knowledge will come by soon I hope though.

Would making a 220v drop cord work ? and maybe run it from your dryer.
Click to expand...

Unfortunately my dryer runs off 110... its one of those units... no 220 outlet currently exists in the house :-/
 
Looks like on you have a "220 only" vfd, and it will not run on 110. Being that it's only 1hp, however, you may be able to wire a 2:1 transformer of the appropriate size to give you a 220VAC power supply off of a 110VAC outlet.
 
you may be able to wire a 2:1 transformer of the appropriate size to give you a 220VAC power supply off of a 110VAC outlet.
Click to expand...
According to the VFD nameplate, 240volt 10.4amp input.
Thats 20.8amp at 120volt. The real amperage will even be higher due to losses in an expensive step-up transformer. (the machine wont always draw that much power, it depends on how big the motor and how heavily its loaded)
In theory it could be done but stretch 'out there' in practicality.
Much easier (and just as dodgy) is combine two 120volt circuits, one from each side of the splitphase to obtain 240volts.
Sadly, If you dont have a 240volt circuit to connect to. Its pretty much done for.
 
Looks like at the price of a decent step-up transformer I am within a shout of getting a new VFD that will run off 110V anyway, so I may wind up going that route.
 
Look at the breaker box. If it has opposing breakers on both sides of a middle strip, you have 220. If it has only one row, it is 110.

If the box is 220, you can make up an extension cord that has two male plugs on separate cords meeting at a terminal box on the other end with a double pole switch and a 220 female socket. It has to be wired by someone who knows what they are doing. The plugs are plugged into wall sockets that are controlled by opposite sides of the breaker box. This will draw two opposing 110VAC legs to the socket where it will be 220VAC. The switch must be off when plugging things in for safety. Also, you need to make sure the wall sockets are on separate circuits, and not from the same side of the breaker box. Also, the cuircuits can not be GFIC

I used to run my small welder on one of these cords when doing field work where there was no 220V socket nearby.

Again, if this does not make absolute clear sense to you, you MUST get someone who knows electric wiring to set it up for you.
 
scott.livesey said:
i guess gas range/stove? what about water heater?
Click to expand...

Gas stove and water heater, so no joy :-/

Stacy E. Apelt - Bladesmith said:
Again, if this does not make absolute clear sense to you, you MUST get someone who knows electric wiring to set it up for you.
Click to expand...

Yeah, I know my limitations and this is beyond the scope of my knowledge. I went ahead and ordered a TECO FM50-101-C last night, and I'll just hang onto the other VFD for the day when I have ready access to 220 again.

Thank you all!
 
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