Phase Converter Sizing

Sizing a phase converter for your three phase load is simple, and can be done in only a few steps depending on the complexity of your load. If you wish to have a phase converter specialist size a converter for you, please call us. In almost all cases sizing can be done over the phone in just a few minutes.

There are three main load classification types. CNC, motor loads, and resistive/inductive loads. Start by reading the section that applies to your load type.

Motor Loads

1. What is the HP of the largest 3-phase motor you will need to start?
2. Is it Easy, Medium or Hard to start? (Click here to determine start load)
3. Find the appropriate column and motor HP. (Easy, Medium or Hard)
4. Consider your Total Motor Group Load. (Total HP of motors that will be run, but not started at the same time)
5. Chose the TEMCo Rotary Phase Converter size that accommodates the power you will need by following the horizontal line to the right. You will want to use either a 6500 or 6000 series converter for these load types.
6. Be sure you have a large enough single phase supply breaker. The single phase breaker should be two times the amps of your 3-phase motor/load up to the maximum recommended breaker size.

"You can always use a TEMCo Rotary Phase Converter that supplies more power than you need now,
but one that does not supply enough KW power output will not work."

CNC Loads

CNC or computer numerically controlled equipment is generally voltage sensitive equipment requiring a voltage balance of ±5%. Some examples of this type of equipment are CNC mills, CNC lathes, UPS's, lasers, and CNC plasma cutters.

To size a converter for your CNC equipment, add your total CNC load amps, or kW and use the Maximum CNC Load column to select the appropriate model. You will want to use either a 6500 or 7000 series converter for these load types.

Resistive/Inductive Loads

Some examples of common resistive loads are heaters, EDM machines, kilns, and ovens. Examples of inductive type loads are power supplies, welders, and battery chargers.

To size a converter for your resistive/inductive equipment, add your total load amps, and use the Converter Maximum Output Amps column to select the appropriate model. You will want to use either a 6500 or 6000 series converter for these load types.

Part Numbering

6500 Series is dual voltage rated. They can accept by factory default 208-240v, or can be field reconfigured for 440-480v. The 6500 series comes only in a NEMA 1 enclosure. If NEMA 3R is required, you must switch to a 6000 or 7000 series.

6000 Series is for use with motor loads or inductive/resistive loads. They are not for use with CNC equipment or other equipment which can not handle a ±10% output voltage tolerance. The 6000 series comes in either NEMA 1 or NEMA 3R. This series is not dual voltage rated, and you must order the model to be either rated for 208-240, or 440-480. TO generate a part number, first start with S6000, followed by the KW number (ex. S6000-21KW). This series by default is factory set for 208-240v. For 480v operation add -480 to the part number (ex. S6000-21KW-480). Also factory default for this series is a NEMA 1 enclosure. For NEMA 3R add -3R to the end of the part number (ex. S6000-21KW-480-3R or S6000-21KW-3R).

7000 Series is for equipment classified as a CNC load. The 7000 series is exactly the same as the 6000 series, except it comes with a ±5% voltage tolerance on the output. To formulate a part number use the same method as the 6000 series, except truncate the KW from the model number (ex. S7000-21-3R).

Rotary Phase Converter Sizing Chart

Largest HP Motor Load Maximum Total Motor Group HP Load Maximum CNC Load Converter Maximum Output Amps (*R) Maximum Single Phase Supply Breaker Converter Model Number Easy Medium Hard Amps kW 2HP 1.5HP 1HP 2.5HP 0-3.6A 0-1.0 6A 10A 6500-2KW 3HP 2HP 1.5HP 4HP 0-6.6A 0-1.9 12A 40A 6500-3KW 5HP 3HP 2HP 5.5HP 0-9.4A 0-2.8 16A 50A 6500-5KW 7.5HP 5HP 3HP 7.5HP 0-12.2A 0-3.7 22A 60A 6500-7.5KW 10HP 7.5HP 5HP 11HP 0-18.7A 0-5.6 31A 80A 6500-11KW 15HP 10HP 7.5HP 15HP 0-25.2A 0-7.5 39A 100A 6500-15KW 20HP 15HP 10HP 22HP 0-35.6A 0-11.2 52.5A 120A S6000/7000-21KW 30HP 20HP 13HP 30HP 0-48.2A 0-14.9 73.5A 200A S6000/7000-29KW 40HP 25HP 15HP 37.5HP 0-62A 0-18.7 96A 250A S6000/7000-36KW 50HP 30HP 20HP 45HP 0-72A 0-22.4 105A 250A S6000/7000-44KW 60HP 35HP 25HP 56HP 0-93A 0-28 129A 325A S6000/7000-55KW 75HP 50HP 30HP 75HP 0-117A 0-37.3 176A 450A S6000/7000-74KW 100HP 60HP 40HP 90HP 0-140A 0-43.5 210A 450A S6000/7000-87KW 110HP 70HP 50HP 125HP 0-172A 0-55 255A 600A S6000/7000-110KW 150HP 100HP 60HP 150HP 0-216A 0-62.5 361A 750A S6000/7000-125KW 180HP 105HP 75HP 170HP 0-258A 0-82 381A 800A S6000/7000-165KW