RELIANCE SP500 AC Variable Frequency Drive

RELIANCE SP500 AC Variable Frequency Drive is a legacy Reliance Electric SP Drive that provides PWM-based control of three‑phase induction motors, allowing speed and torque to be varied by adjusting output frequency and voltage. The SP500 family is offered in multiple voltage and power configurations, including a 115 V input model (1SU11001) rated for 0.25–1.0 HP and a 380–460 V input model (1SU41001) rated at 1 HP with a Type 1 enclosure. The SP500 is documented as an AC PWM inverter and includes installation guidance on wiring, programming, and motor lead lengths for proper application. Typical uses include conveyors, pumps, and fans where precise speed control and smooth startup are beneficial.