Wiring a teco vfd

Josh Rider

Josh Rider

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Sep 2, 2014
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My teco fm50 202 vfd and 3 phase 2hp motor arrived the other day. I'm waiting on the potentiometer to arrive and want to install everything soon but I want to make sure I do this safely.

I have 220 single phase coming from my panel on a 30 amp circuit breaker to an outlet right now.
The wire coming from my panel is 12-3 yellow insulated romex.


A couple questions:

1. After shutting the breaker off of course, can I disconnect the outlet and install a circuit breaker? The manual recommends a mccb between the panel and the vfd.

2. If so, what type of mccb should be installed? When I contacted factorymation, the one they recommend was around $170 so I'm thinking that's not what I need.

3. Is it ok to go from the romex to circuit breaker to the flexible 12-3 soo cable to vfd?
 
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Why would you need to install a second circuit breaker? Outlets and plugs are expensive. Go straight from the breaker to your VFD, a junction at the current outlet shouldn't be an issue.
 
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Yeah, I don't have most of that and doubt that most do either. I have a single twistlock connector in the middle, with the 30A 220 breaker at one end and the VFD at the other.
 
hard wire motor to frequency drive .... hardwire drive to breaker ... simple. don't forget ... always verify a circuit with a quality meter and always treat a circuit live when you're not certain. 110v is lethal ... if you get an electrical shock it could be lethal up to 24 hours later.

i'm assuming you have a 3 phase service. you're going to need a 3 phase breaker. that single phase breaker is no good.

cheers

grumpy_grinder
 
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grumpy_grinder said:
hard wire motor to frequency drive .... hardwire drive to breaker ... simple. don't forget ... always verify a circuit with a quality meter and always treat a circuit live when you're not certain. 110v is lethal ... if you get an electrical shock it could be lethal up to 24 hours later.

I'm assuming you have a 3 phase service. you're going to need a 3 phase breaker. that single phase breaker is no good.

cheers

grumpy_grinder
Click to expand...

Why would you assume that ?
 
The picture above is not my exact plan. I just want to make sure I'm not doing anything improper that could start a fire. I know an electrician that installed the 220v to the outlet, but he doesn't know anything about vfds and motors. I've been going through old threads for hours and have about 20 of them bookmarked.

The setup I am doing is what some of the other members did on this forum by enclosing the teco vfd inside an enclosure to keep it safe from the dust and wire a remote potentiometer and fwd/reverse switch for a disc grinder that will be added to the vfd as well as the kmg.

After reading though I don't see the need for the circuit breaker, since it's already run through a breaker on my panel.

Do I need the 12-3 going to the motor or 12-4?
 
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