How do I know what type of plug and cord my grinder needs?

wdfwguy · Jul 12, 2017

I have a 2hp motor and VFD for my new grinder, and I have an electrician coming over to install a 220v outlet in the garage.

But I'm curious how I know what size plug and fuse I need, and what type of cord to put on the motor.

12345678910 · Jul 13, 2017

You show us the plate on the motor

Lieblad · Jul 13, 2017

If you want a plugged connection between motor to VFD, a NEMA15-20L connector is suggested. Its "twist-lock" style. 3 phase, (4 conductors, 3 poles with ground) 20amp capacity.

The VFD to supply receptacle will depend on the amperage of circuit your electrician is installing.
If its to be a typical residential 30amp "dryer circuit", NEMA 14-30 is suggested.

Ken H> · Jul 13, 2017

That question is best answered by your electrician since he's (she?) is installing the circuit and will know what is required, what the circuit is rated for.

wdfwguy · Jul 13, 2017

12345678910 said:
You show us the plate on the motor

12345678910 · Jul 13, 2017

Lieblad said:
If you want a plugged connection between motor to VFD, a NEMA15-20L connector is suggested. Its "twist-lock" style. 4 conductors, 3 poles with ground. 20amp capacity.

The VFD to supply receptacle will depend on the amperage of circuit your electrician is installing.

Yes

Tell him you want twist lock, let him make the decision on which one.

The frame is HC - be careful on what the shaft is

Drew Riley · Jul 13, 2017

Unless you live in a really old house/shop, you likely won't need fuses, but breakers. Any electrician worth his salt should be able to give you the proper recommendations for wire sizes and their appropriate plug ends. MOST circuits I run in the shop would likely do fine on 14AWG conductors, but I'll typically use 12AWG anyway, at least from panel to wall outlet. You should be fine with a 15amp twist lock, but your electrician should know exactly what you need.

Atlas Knife Company · Jul 15, 2017

Make sure you use a VFD with this motor. Hopefully you already know this, but 3PH does not plug into 220. Also, use the wiring diagram for low voltage. You could run this motor from a 120V outlet at 12 amps, into your VFD which will convert it to 3PH 208. You don't really need a dedicated 220V outlet for it, but it doesn't hurt. Just make sure you have the right VFD.

Drew Riley · Jul 15, 2017

Atlas Knife Company said:
Make sure you use a VFD with this motor. Hopefully you already know this, but 3PH does not plug into 220. Also, use the wiring diagram for low voltage. You could run this motor from a 120V outlet at 12 amps, into your VFD which will convert it to 3PH 208. You don't really need a dedicated 220V outlet for it, but it doesn't hurt. Just make sure you have the right VFD.

He could run the motor on 110vac only if he has a specific type of VFD that will support 110 input voltage, such as the KBAC 27d. However, it should also be noted that while this will run a 2hp motor, it will only give hime around 1.5hp of output. 220VAC would be a better option, and give him the full 2hp.