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Speedmaster® Micro Series compact inverters
offer "big drive" features for adapting standard or premium efficiency three phase motors to adjustable speed operation. Utilizing the latest micro-processor and advanced IGBT power conversion devices, these high performance controls program and read-out in plain English, eliminating the frustration and time involved in looking up confusing coded symbols.

Complete, rugged steel enclosures for NEMA 1 (IP31), or NEMA 4/12 (IP65) service do not require additional enclosure protection as with many plastic housed compact drives. Built-in thermal overload protection reduces additional costs. Heavy duty wiring terminals accessible via three conduit openings on the bottom of the housing for power in/out and input/output signals speeds installation and reduces installation costs.


SPEEDMASTER® Adjustable Speed AC & DC Drives

Micro Series AC Inverters

1/2 thru 60 HP
SM Plus Sub-Micro AC Inverters 1/4 thru 10 HP
DC SCR Controls Sub-FHP thru 3 HP
DC Regenerative Controls 1/4 thru 2 HP

DC Pulse Width Modulated Controls

Sub-FHP thru 1/4 HP

For more information, see the following literature:

PDF User Guides for SPEEDMASTER® Drives


LEESON three-phase AC reactors are intended for use as input (or output) filters for variable frequency drives. Drive performance is improved by protecting the input rectifier from failure or damage and acting as a buffer between the line and the solid state power circuit.

Transient voltages on the AC power line can cause inrush currents to an AC drive. These transient voltage conditions are often caused by utility capacitor switching. The addition of a line reactor will limit the magnitude of inrush current preventing tips and component failures.

  • Lifetime Warranty
  • Universal footprint
  • All copper windings
  • CSA certified
  • UL/ULC recognized

Two Rating Levels, Two Choices, One "Optimized" Answer: the new KDR

These units are used between the line and drive. The KDR Optimized Drive Reactors come in two ratings; Low "2" (low impedance) and High "2" (high impedance). Input impedance can significantly improve drive performance; however, it should be noted that as impedance increases, the DC voltage one VFD's capacitors actually decreases. This decrease can become significant enough to cause either an undervoltage trip or excessive motor current in the VFD. The KDR Optimized Drive Reactors have been designed to provide the best protection for both your drive and your application.

Input Drive Reactors

575V Low Inpedance

2 thru 350 HP
575V High (Z) Impedance 2 thru 350 HP


KDR Optimized Drive Reactors are used between the output of AC-PWM variable frequency drives and the motor, where the motor lead lengths are less than 100 feet.

The addition of a KDR unit to the output of a drive will dampen overshoot peak voltage, reduce motor heating and audible noise, helping to extend the life of the motor. The units also help prevent inverter instantaneous overcurrent trips because they provide needed inductance when the load on an inverter has an abnormally high capacitance.

The 100 foot guideline has been recommended because as motor leads become longer, the resonant frequency is lowered, and the magnitude and duration of the voltage spikes increases. Even though the addition of a KDR can be beneficial, the addition of a reactor may be ineffective and potentially detrimental to system performance where motor lead lengths exceed 100 feet.

Output Drive Reactors

575V Output

2 thru 350 HP




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