Sizing & Class distinctions for Rotary phase converters.

While the information contained on this page is provided as general information only, it is made available for those individuals seeking additional information related to Rotary phase converter types, selection, and Class designations.

Alternatively, there is little need for individuals to try to determine a converter size and type, etc.  Simply call us directly with your specific load application, HP's, voltage rating, etc., and have one of our team members recommend the correct phase converter.

======================================================================

Sizing a rotary phase converter can not be accomplished on the basis of horsepower alone since load characteristics differ for various applications. The ability of a converter to provide  the required Starting and Breakdown Torque for a particular motor driven load,  is determined by its "Class". Converter "Class" refers to the HP rating of the converter versus the load.  A converter with a higher Class rating will provide greater Starting and Running torque for a specific load.  

One additional factor contributing to the ability of a motor to provide motor rated starting and running torque, is the angular distribution of the converter's output. PhaseMAXX general products are designed to operate with angular phase displacement no greater than two degrees. CNC converters can maintain phase relationships within a one (1) degree variant.

PhaseMAXX   Series "S" (Single Rated) , series "D" (Double Rated), and series "T" (Triple Rated)  Rotary  phase converters,  as well as Auto-transformer phase converters are subject to Class 1, 2, or 3 designations.  Both OSC and SC  Static phase converters are only available for Class 1 application. Be sure to read the "Converter Standards" section (Main page Link # 4), for detailed information regarding converter size determination.

PhaseMAXX Single Rated converters can be recognized by the model number Series "S" suffix.  As an example, a 5 HP motor will require a minimum model 5S if the load has been determined to require a Class 1 converter,  a model 7S if the load has been determined to require a  Class 2 converter, or a model 10S for a load requiring a Class 3 converter. Single Rated converters are designed for operation of a single motor only.

PhaseMAXX Double Rated converters can be recognized by the model number Series "D" suffix. As as example,  a 5 HP motor will require a minimum  model 5D if the load has been determined to require a Class 1 converter, a model 7D if the load requirement is a Class 2 converter, and a model 10D if the load requirement is a Class 3 converter.  Double Rated converters can operate multiple motors to a total HP rating that is Double the numerical value of the digit set in the model number. (EG: A  PhaseMAXX - 5D can operate a total of 10 HP (with application of *Diversity Factor), provided no single motor is larger than 5 HP).

PhaseMAXX Triple Rated converters can be recognized by the model number Series "T" suffix. Again as example, a 5 HP motor  will require a minimum model 5T if the load has been determined to require a Class 1 converter, a model 7T if the load requirement is a Class 2 converter, and a model 10T if the load requirement is a Class 3 converter.  Triple  Rated converters can operate multiple motors to a total HP rating that is Three times the numerical value of the digit set in the model number. (EG: A  PhaseMAXX - 5T can operate a total of 15 HP (with application of *Diversity Factor),  provided no single motor is larger than 5 HP).

PhaseMAXX Triple Rated converters are available as "T", "TX", "TCNC" and "TZ" series. The "T" series converters are triple rated products where the converter's magnetic starter is built into the converter. "TX"  items are supplied without a magnetic starter, where a customer supplied fusible disconnect (knife switch) can be used to start and stop the converter. "TCNC" converters are triple rated products designed for critical voltage with angular distribution of all three phases within one degree. The new "TZ" series converters are supplied with special soft-start starters. "TZ" soft-start features can also be incorporated into the "TCNC" converters.

* Information regarding "Diversity Factor" can be found by selecting the appropriate link from the main (Home) page.

Consult Electram to determine the Class requirement for your specific load. For additional information about each converter type (Single Rated series "S", Double Rated series "D", and Triple Rated series "T"), preview the specific PhaseMAXX section by selecting the related (Home page) link .

The following chart outlines Class designations for Triple Rated (series "T") rotary phase converters. References to NEMA (National Electric Manufacturers Association) are included to indicate actual HP ratings of a particular FRAME at a specific RPM as pertains to electric motors under the jurisdiction of the Motor and Generator sections of NEMA.

Electram Phase converters are engineered & precisely manufactured  through a Quality Assurance Program.

Every phase converter or motor control center manufactured by Electram follows a stringent Quality Assurance Program which ensures you get the best quality product we can provide. Just one more reason why Electram has the best name in the industry.

The Electram engineering staff is dedicated to your power needs.  Any one of our team members will be pleased to help you select a phase converter for a particular application.

Need motor starters and/or electric motors?   Electram Rotary Equipment Ltd., is a CSA / C_US certified facility for the manufacture of phase converters, and Special Control Assemblies ranging from individual motor starters to complete grain handling motor control panels. If it's motors or motor control you need, then call us "on our nickel" at 1-800-863-6646, or E-mail us at wizards@electram.com

Lincoln, Leeson, and Baldor motors. Lovato motor control.  Grove Gear products. Bremas cam operated switches.  AC Tech Variable frequency drives.  We have it all!  Call us to compare.

Electram Rotary Equipment Ltd.
18112 - 107th Avenue
Edmonton, Alberta, Canada
T5S 1K5

Local Ph: (780) 451-0418   Fax: (780) 451-0430
Toll Free: (800) 863-6646
E-mail:  wizards@electram.com

Alternatively, use the Phase-Off forum submission form (found by selecting link # 34 from the Home page) for any Price or Information request, and at the same time provide your feedback about our web site and/or products. You may even choose to have your comments (About THIS or ANY OTHER) phase converter manufacturer's products and services posted to the forum.

Please include your demographics eg: (USA - state/city or town/ & zipcode)
or (Canada - province/city or town)   for all price requests.

Note: All USA price requests must include a zipcode.