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Procedures advice manual (PAM3). Department of Immigration and Multicultural and Indigenous Affairs.; Australia. Guidelines for officers administering migration legislation Procedures advice manual 3: Responsibility: Department of Immigration.
We all have that occasional customer who got a “deal” at an auction: a compressor, or lathe, or wood-working equipment, only to discover when he started to install it that this equipment has a three-phase motor and only single-phase power is available. Maybe it’s your neighbor or a friend from church. In any case, you know that you are about to be called upon to “convert” that piece of equipment, and you probably realize that it’s going to cost you more than you can charge. Solutions previously used include:. Connecting two phases to the incoming 220V single-phase power and using capacitors from one energized lead to create a “phantom leg” for the third lead. Use a rotary phase converter. Fortunately, there is a better way to solve this dilemma.
Because a variable frequency drive (VFD) rectifies each pair of phases to DC, then inverts the DC power for the three-phase output, a VFD can be used with single-phase input power to operate a three-phase motor. Download the article below for the details.
I am taking ownership of a South Bend 13' X 28' lathe (CL 145B I think) and a Bridgeport Series 1 mill in the very near future. My thought is to utilize my welding receptacle to feed into a phase converter to run the machines (strictly one at a time). The static converters look to be very affordable and less intrusive to install. I know there is the 1/3 power loss thing associated with them. Would I be OK using a properly sized static for these machines or should I just pursue getting a RPC? I am totally new to this machining thing so what will I be turning and milling.I have no idea?thanks for your thoughts/suggestions. A lot of guys just cobble up a rotary converter (using a 3 phase motor) and couldn't be happier.
If I were you, I would research used equipment dealers in your area, scrap metal recyclers that allow you to buy things from them, electric motor repair shops, craigslist etc. See what your options might be. Once you are confident you could make a rotary converter yourself, place a 'Wanted, electric motor' ad in your local craigslist. Don't be too vague, but don't be too specific, either.
If you already have 50 amps of 220 at a receptacle, that's a good start. It doesn't need a good output shaft (though an output shaft can be useful for starting), it doesn't need a common base, it just needs to spin (quietly) and be firing on all three windings. Asking this type of question here is like asking whats the best flavor of ice cream or what color a pickup truck should be. That said here's an entry level summary to help you make your decision. Static Phase Converter: Not really a converter, it simply serves to start the 3ph motor at which time your motor chugs along at roughly 2/3 of rated HP.
These must be sized to the motor. Rotary Phase Converter: The RPC uses a 3 phase 'idler' motor to generate the third phase. More expensive because it includes all the parts in option 1 and the motor too. The RPC needs sized large enough to start your largest load, so they can be oversize to any single motor load. Advantage with an RPC is that multiple motor loads can be run at the same time. Variable Frequency Drives: The VFD is a solid state electronic device that runs on single phase (or 3 phase) power and outputs 3 phase power. These need sized to the motor and should be hard wired to the motor.
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With a VFD all on/off or forward/reverse functions must be done via the VFD control. Remote switches are permitted but they must signal the VFD directly via control input contacts. In other words no switches are allowed between the motor load and the VFD. Summary: VFD's offer functions such as motor speed control, and control of spin up and spin down timing. RPCs offer cheap power when working with large numbers of devices or multi-motor machines. Which is best? That's up to you.
I own both, every tool has its purpose. Edit: One thing to note is that for 3 phase loads up to 1HP you can get 120VAC input VFDs. You'd just need to ensure you have adequate capacity on that circuit.