Variable Frequency Drives & Digital Phase Converters

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Phase Technologies’ drives and phase converters can be configured with a variety of optional equipment.

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Output Filters

Now Producing The Most Cost Effective Sinewave Filters On The Market!

Output filters are necessary when motor leads exceed 200 ft. Without filters, long leads allow reflected harmonics to create dangerous voltage spikes that can exceed the insulation rating of the motor cables and windings.

Over time, these voltage spikes will degrade the insulation and result in motor faults. An output dV/dT (200ft to 650ft) or sine filter (500ft to 3000ft+) can be installed in the panel at the factory on most LH and DX Series systems.

A filter reduces harmonics in the PWM output voltage, smoothing the waveforms to reduce vibration in the motor. Filters also reduce common mode currents in the motor windings that can discharge through motor bearings, causing pitting and premature motor failure.

Long leads between the unit and the motor with an unfiltered PWM voltage can lead to dangerous voltage rise from reflected harmonics. Very long leads, such as in deep well submersible pump applications, may require the use of a sine wave filter to remove most of the harmonics from the waveform.

Surge Arrestor

Phase Technologies recommends and integrates Raycap Strikesorb® surge protection for every installation. By utilizing the best surge protectors on the market we are able to keep costs low by integrating them at the factory.

Molded Case Circuit Breaker (MCCB)

Drives and some phase converters are available with an optional MCCB integrated into the panel. The breaker is equipped with an external disconnect and is service-rated. Ask a sales associate if you require short circuit ratings above 25kA.

Hand/Off/Auto (HOA) Switch with Speed Potentiometer

Most models are available with an external mounted HOA switch and speed potentiometer. When the switch is in the Hand (Manual) position, the speed pot can be used to control motor speed on the main motor output of the drive. In the Auto position, the main output is controlled by external control signals through the various analog and digital inputs to the drive. For example, if the drive were configured in constant pressure control mode, the 4-20 mA signal from the pressure transducer would control motor speed. An HOA switch in the OFF position will stop the motor on the main output of the drive. The secondary drive output, Aux Power, will not be affected. It is typically controlled by another external switch on the panel door.

AuxPower™ (1LH Series - Performance Models Only) - For Center Pivot Irrigation

Phase Technologies has designed a ground-breaking VFD that provides full-featured speed control of the main motor load and Aux Power, an independently controlled phase converter to power an entire center pivot irrigation system. The converter provides pure sinusoidal power rated 60 Hz, 460V three-phase, and is safe to power virtually any load, even sensitive electronics. The Aux Power converter is available in two sizes, 18 amp or 32 amp. This option is available only on 1LH Series drives.

Auxiliary Power Supply

An additional control supply can be added to power additional lights, fans, heaters, and/or ancillary control systems. The supply is rated 240/120 VAC, 1 amp. Power is accessed through terminals on the sub-panel.


Utilizing a unique ducting system Phase Technologies’ systems will run in temperatures down to -10C, but for the harshest environments, a heater package is available that will allow a system to run in temperatures as cold as -40C.

VFD Bypass

If downtime isn’t an option, Phase Technologies can integrate a bypass into the Performance Series packages. This allows the user to start and run a motor if their VFD is down.

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