Phase Converters are designed to convert single-phase electricity into 3-phase power. Each of these converters uses a different method of conversion and therefore needs to be sized in a different way. In order to avoid oversizing and spending more money than you really have to, you need to find out which device is better for your specific application. There are two basic phase converter types:.
This is a basic phase converter that is designed as a startup device for 3-phase motors. Three-phase power will be generated until the motor starts and once it does, the converter will be disconnected and continue to run on one-phase power. The horsepower of these motors will be greatly reduced since only 2 out of 3 windings will be receiving power you are looking at one-third or one-half in HP power reduction.
These converters are more cost-effective and are commonly used to operate a single machine. This phase converter is only suitable for applications that can run on reduced horsepower. Following machines are known for working on a static phase converter because the operator was able to control the load:. Following machines will NOT work with static phase converter because they use full horsepower on their motors:. A static phase converter sizing is based on the horsepower of the motor that you are trying to start one to one.
These loads should be carefully selected as mentioned above to avoid problems. It is not recommending to oversize phase converter since it may give your machine more startup energy than it can handle and it will simply not start.
Static phase converters are generally known for working with up to volt motors. You can run multiple motors on your static phase converter, as long as you start them separately one after another. Unlike the static phase converter, the rotary phase converter will keep on producing 3-phase power while your engine is running and that means you get to keep its full HP.
Ratings are also important since the company has to give their products in for testing and if they pass it, they can proudly display a quality certificate. If you are like many shop owners, you probably anticipate future growth and would like to set yourself up with a larger-size phase converter.
Some rotary converters out there, like American Rotary, allow you to safely run smaller motors and maintain proper voltage from any size of equipment.
So here are some guidelines:. The first step in sizing your phase converter is to make sure you actually have enough single-phase power coming in. A good quality RPM, three phase wye-wound, V motor is the best choice. Used three-phase motors are inexpensive and readily available. When using this method, it is possible to run multiple machines as long as the idler motor is large enough to handle the largest load it would ever have at any one time.
For instant reversing of the load motor, as in rigid tapping, the idler motor must be a minimum of twice the HP rating of the load motor, and perhaps more. The Static Converter is sized to the HP of the idler motor, not the load motor s.
If the motor is loaded beyond that point, you must use our Rotary Converter, or use method number 2 as explained in the Installation Instructions.
Next, you must find the proper horsepower range for the application. The largest motor on the machine, or idler motor if used, must fall within the minimum and maximum ranges of the converter. Two speed motors are usually dual horsepower. You should select a converter with a minimum and maximum range, which will accommodate both horsepower ratings.
However, with Taiwanese and Chinese motors, the larger horsepower should be at the lower range of the converter whether it is a two speed motor or not. This is because Taiwanese and Chinese motors draw more amperage during start than do domestic motors and therefore require a slightly larger converter than would normally be used.
A larger size converter will not provide greater horsepower. A Few Additional Items to Remember: The first motor to start on the converter must fall within the minimum and maximum horsepower range on the converter.
However, after the first motor has started, motors below the minimum range may be started and can usually be left running as the main motor is stopped and started. Do not add the horsepower of the power feed, coolant pump, or other accessory motors when sizing a converter.
The only time you would add the horsepower of two or more motors together would be if they always start at exactly the same time. Heavily loaded equipment usually consists of equipment with pumps, blowers, fans, compressors, etc. NOTE: It is best to mount the converter upright, not upside-down or side-ways as shown here. The single-phase neutral wire is not required for operation of the converter. Properly ground all electrical equipment. Use a grounding clip to attach the ground wire to the conduit box.
Resistive or single-phase loads must only be connected to lines A and C. This product is designed for indoor use only. Do not use in wet or damp locations. Do not mount on equipment with excessive vibration. The red indicator light should only come on when the motor is starting, and should go out once the motor has reached operating speed.
The light should never stay on longer than seconds since the converter could be damaged if it stays on longer. When testing the converter for the first few times after installation, keep your hand near the off switch of the machine, ready to turn it off, to prevent damage to the converter due to a wrong or loose connection.
It will generate two-thirds power of your motor. Your motor will work at full potential even if the capacitors are disconnected. What are the Features of Static Phase Converters? There are features incorporated to boost the performance of your converter and to ensure an effortless start process.
These features make the device to start a 3 phase motor on the single phase power. You cannot expect all these features from the similar products of the industry. In addition, the product is reliable. It has received appreciations for all the improved features.
You will find two types of the static phase converter unit models. You can choose the one depending on your unique needs.
The ultimate job of a static phase converter is to power a three-phase unit. Remember that there are two types of phase converters to choose from.
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