Three-phase utility service is used in large industries, factories, and in manufacturing units where a large amount of power is required. All kinds of equipment require three-phase power: machines for woodworking, metalworking, CNC machining , foodservice, and farming, just to name a few. And getting it installed is enormously expensive. So, what do you do? There are two main types of these helpful devices: static phase converters, and rotary phase converters.
To determine which type you need for your application, you first need to understand the difference between the two. This article will help you understand that, as well as your main considerations so that you can make a smart decision. So, what is a static phase converter? Capacitors help start the three-phase motor, but then are disconnected once the motor is up to speed. At that point, the system is effectively only running lower single-phase power. A static phase converter, although it is a simple and relatively low-cost way to start a three-phase load with single-phase power, is not usually suitable for heavy-duty three-phase equipment.
Many other types of equipment—vacuum pumps and air compressors being two prime examples—cannot be run at all with a static phase converter. Feel free to contact American Rotary for help. Potential of control refers to what you can power with a phase converter. Connected in this manner the relay will operate as it should, without intermittent opening and chatter. Use the rotary converter to supply the entire shop with three phase power. The rotary type converter will run any size motor from the smallest HP up to the HP rating of the idle motor used.
Even resistive 3-Phase loads such as welders can be run from rotary converters. The magnetic starters are used to run phase converters or individual motors. The main reason for using a magnetic starter is to protect the motor, phase converter, and operator from momentary power outages. The Deluxe version starter allows for remote control of a rotary converter and automatic shutdown when the shop lights are turned off. This helps prevent leaving the rotary converter on all night by accident.
None of the starter circuits contain overload protection. Overload protection should be provided for each motor on a circuit including the Idle Motor used in the rotary converter. Quite often machine tools will have overload protection already installed. Please note that EPO and Ace Electronics are local surplus electronics suppliers in Houston, hopefully you will have such a supplier on your area.
This is a Motor-Start capacitor, these are designed for use with alternating current AC. The capacitor should be chosen for about 70 to uF per horsepower. A larger capacitor can give more starting torque, but may prevent the potential relay from operating properly.
Be sure the capacitor is rated for at least VAC. The relay is a Potential Relay. The Grainger part 6X is recommended. Other values can be used, but it may be necessary to disassemble the relay and adjust it.
Potential relays can be found in discarded air-conditioner units. If you decide to use the idler motor-generator make sure that:. This way, you can also run several machines at the same time, as long as the idler is large enough to handle the largest load. It is recommended for the idler motor to be:.
Just make sure that your Static Phase Converter has:. After your largest motor has started, you can start adding other motors, as long as:. H ere are some wiring diagrams with Static Phase Converter and Run capacitors:. There is more information about it in this article 4th International Conference. Well, this variation is also known as Rotary Phase Converter which will be discussed below. What is a Static Phase Converter? It is a system of start capacitors and a relay switch. If you use Static Phase Converter or just start capacitors and wire them properly together with Idler motor, you will generate 3-phase power, just as a Rotary Phase Converter would!
If you ever decide to do one yourself as long as you are qualified to do this work, which could be dangerous , here is a short video to help you out:.
So what do we have here? Here are some pros and cons of Static and Rotary Phase Converters:. In conclusion, I would like to mention that everything comes down to your load and how heavy you are planning to use your equipment. If you have a small to medium-size load and you are doing this as a hobby, the Static Phase Converter may suit your needs perfectly.
If you have a small enterprise, large machines, or a very busy shop, you may want to go with a Rotary model. Table of Contents hide. Static Phase Converters Ronk.
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