Phase Converter Sizing Application
When sizing for a Rotary Phase Converter it is best to size with a 2:1 ratio to ensure you will have enough starting capacity. This sizing guideline will protect your equipment long term and ensure it performs at its highest efficiency.
Try out our Phase Converter Application by selecting your equipment type and inputting your largest HP rating to see which converter series and size would be best for you.
Phase Converter Sizing Application
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- Band Saw (belt driven)
- Lathe -2HP ( Belt Drive )
- Belt Sander -3HP
- Binding Machine
- Bridgeport Mill
- Delta Shaper
- Door Opener
- Drill Press
- End Mill
- Grommet Machine
- Lathe -2HP or less
- Masonry Saw -7.5HP or less
- Milling Machine
- Panel Saw
- Sewing Machine
- Table Saw
- Tumbler
- Baler
- Band Saw (Direct Drive)
- Battery Charger
- Bender
- Bench Grinder
- Blower
- Boring Machine
- Brake / Shear
- Buffer
- Car Lift
- Center pivot
- Chain Saw
- Centrifugal Pump
- Chop Saw
- CNC Lathe
- CNC Mill
- CNC Router
- Coffee Grinder
- Cold Saw / Chop Saw
- Compactor
- Concrete Mixer
- Conveyer Belt (Horizontal Moving)
- Crusher
- Cutoff Saw
- Die Cutting Press
- Dish Washer
- Door Opener
- Dough Mixer 5HP or less
- Dry Cleaning Equipment
- Dust Collector
- Edgebander
- EDM Machine
- Embroidery Machine
- Exhaust Fan
- Fan
- Garbage Compactor
- Grain Dryer
- Grain Mixer
- Granite Saw
- Grinder
- Hammer Mill
- Heating Element
- Hoist
- Ice Cream Machine
- Ice Maker
- Industrial Dryer
- Injection Molding Machine
- Ironworker
- Irrigation Pump
- Jointer
- Kiln
- Laser
- Lathe
- Lift Station Pump
- Meat Grinder
- Meat Saw
- Mill
- Mixer
- Molder - Molder
- Organ-Pipe
- Oven
- Paper Cutter
- Paper Shredder
- Planer - Wood
- Plasma Cutter
- Power Washer
- Press Brake
- Pressure Washer
- Printing Press
- Punch Press
- Radial Arm Saw
- Robotics
- Roller
- Router
- Saw Mill
- Shaper
- Shear
- Sheet Metal Break
- Surface grinder
- Spray Booth
- Tanning Bed
- Tire Balancer
- Vibrating Machine
- Washing Machine
- Welder
- Wheel Balancing Mach.
- Wide Belt Sander
- Air Blower
- Air Compressor
- Air Conditioner
- Auger
- Car Wash
- Centerless Grinder
- Chain Hoist
- Chiller / Freezer Compressor
- Chop Saw
- Compressor
- Conveyor Belt (Vertical Moving)
- Crane
- Elevator
- Fire Pump
- Flywheel Assisted Machinery
- Freezer Compressor
- Gear Head Lathe
- Grain Auger
- Granite Mixer
- Hydraulic Equipment
- Ice Maker
- Lathe 2.5HP+
- Lift
- Marble Cutter
- Masonry Saw
- Molder
- Paper Cutter
- Printing Press
- Pump
- Reefer
- Refrigeration Compressor
- Shaper
- Shear
- Shredder
- Submersible Pump
- Treadmill (Horse)
- Treadmill
- Vacuum Pump
For models 100 and larger please call us at 1.866.676.6686
HOW TO SIZE A CONVERTER
See if you load(s) are listed in our sizing tool for the right converter recommendation
1. Determine the Total Load (HP or kW)
- Sum of all motor loads: Identify the horsepower (HP) rating or kilowatt (kW) rating of each motor or piece of equipment that will be powered by the converter.
- Running vs. starting loads: Separate the motors into running and starting loads. Motors with high starting loads (such as compressors, pumps, etc.) may require a larger converter. (see sizing chart)
2. Identify Load Types
- Hard-starting loads: Equipment such as air compressors, elevators, or hydraulic pumps requires more power to start than they do to run.
- Light loads: Fans, saws, and similar equipment have lighter startup demands.
3. Determine Motor Start-Up Requirements
- Inrush current (starting current): Motors usually draw 6–8 times the full-load current at startup. High-inrush motors require a larger phase converter to handle the load without tripping or voltage drops.
4. Convert HP to the Correct Rotary Phase Converter Size
- General rule of thumb: A rotary phase converter should typically be sized at 1.5 to 2 times the HP of the largest motor that will be started.
- Example: For a 10 HP motor, you would need an RPC rated for 15–20 HP.
- Multiple motors: If running multiple motors at once, size the converter based on the largest motor and ensure the total combined HP does not exceed the converter’s rating.
5. Factor in Load Types
- CNC and sensitive electronics: For applications involving CNC machines or sensitive electronics, a balanced rotary phase converter is recommended to maintain consistent voltage across all phases.
6. Consult Manufacturer Guidelines
- Always cross-reference with the manufacturer’s specifications for optimal sizing.
By following these guidelines, you can ensure that your rotary phase converter is appropriately sized for your 3-phase application, avoiding operational issues such as overheating or insufficient power.
Condensed Steps
Determine Total Load: Calculate the total HP or kW of all motors and equipment to be powered.
Identify Load Type: Determine if loads are hard-starting (e.g., compressors) or light-starting (e.g., fans).
Convert HP to Converter Size: Choose an RPC rated 1.5 to 2 times the HP of the largest motor.