Static Phase Converter General Questions

What is a static phase converter?
static phase converter simulates 3 phase power to start a motor. Once the motor starts, the static converter drops out and the motor runs on single phase power. There is about a 1/3 power reduction in the motor’s horsepower.

What type of equipment will a static phase converter run?
A North America static phase converter will only run motor loads. Because it does not produce a constant 3rd leg of power, a static converter will not run a resistive or inductive load.

Will my motor run at full power?
A static phase converter’s generated leg of power disengages after startup, leaving the electric motor to run on single phase power. Only two of the three motor windings are fully energized. The motor has about a 1/3 power loss. Therefore, it is not recommended for heavy loaded motors.

Why use a static phase converter?
A static phase converter is a cost-effective alternative to other types of phase converters. They are ideal for hobby and occasional use applications where motors don’t need full power.

Sizing

How do I size a static phase converter?
A static phase converter is designed around NEMA standards (North America) and T-frame motors (post 1965). Sizing is based on the horsepower of the motor you are trying to start. They are intended for easy to medium starting and running motor loads.

Can I oversize a static phase converter?
Oversizing a static phase converter can produce too much startup electricity and/or excite a motor. This can cause the motor not to start. In some cases, capacitors can be added or disconnected within the static phase converter. Please consult the factory.

Will a larger static converter produce more power?
Unfortunately not. A static phase converter is only used during the start cycle of the motor. Once the motor has started, the static converter has disengaged. The motor is now running on the 2 single phase legs of electricity.

Can I run 2 or 3 motors with a static phase converter?
Yes, as long as the largest motor is started first and falls within the starting size/range of the static phase converter. Once the largest motor is started, smaller motors can be started.

Will a static phase converter run a 460 volt motor? Will it work with a transformer?
A static phase converter will only work with 208 to 240 volt applications. Electrically, a static phase converter must see that a motor is trying to start; therefore, it cannot be used in conjunction with a transformer.

Can I use a static phase converter to make a rotary phase converter?
Yes, a static converter would be the starting mechanism for a rotary converter. A motor starter and power factor capacitors may need to be added for better results.

Mounting and Installation

Where can I install a static phase converter?
Generally it is mounted close to your equipment. It can be mounted directly to the equipment as long as there isn’t excessive vibration. A NAPCco static converter is equipped with two mounting brackets for easy installation.

Is a static phase converter easy to wire?
Absolutely, a NAPCco static phase converter has a simple three wire connection. A junction box is located on top of the converter’s enclosure wire a terminal block for wiring inside.

What size circuit breaker/fuse and wire do I use?
A circuit breaker/fuse and wire is determined by the size of the static phase converter and size of the motor you are starting. A recommended circuit breaker/fuse and wire chart is available in the operation and installation manual.

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