Reliance DC2-70U Variable Speed DC Drive

The Reliance DC2-70U is a compact, enclosed variable speed DC drive designed for reliable control of permanent-magnet and shunt-wound DC motors. Engineered for industrial use, it delivers smooth speed regulation, adjustable acceleration/deceleration, and robust protection in a NEMA 12 enclosure, making it suitable for a wide range of general-purpose and light-to-medium duty applications.

The DC2-70U is a single-phase input drive that operates from 115VAC or 230VAC, 50/60Hz, and provides adjustable DC output voltage for motor speed control. It features a rugged metal housing with NEMA 12 protection, safeguarding against dust, dirt, and dripping liquids in industrial environments. The drive integrates power semiconductors, control circuitry, and user-adjustable potentiometers for speed, acceleration, deceleration, and current limit, enabling straightforward setup without complex programming. Built for continuous duty, it offers stable performance and long service life in demanding conditions.

The DC2-70U provides precise speed control with adjustable minimum/maximum speed, acceleration, deceleration, and current limit, allowing optimization for different motor and load requirements. It includes built-in protection functions such as overcurrent, overvoltage, and thermal protection, which safeguard the drive and motor from damage during overload or fault conditions. The simple, user-friendly interface with external potentiometers enables quick on-site adjustments, while the compact design saves cabinet space. It supports remote control and system integration via analog inputs, and its durable construction ensures reliable operation in harsh industrial settings.

The DC2-70U is widely used in industrial automation applications requiring adjustable speed DC motor control. Typical uses include conveyors, packaging machinery, machine tools, fans, pumps, material handling equipment, and general-purpose industrial production lines. It is ideal for light-to-medium duty applications where simplicity, reliability, and cost-effectiveness are prioritized.

Install the drive in a clean, dry, well-ventilated area with sufficient clearance for airflow. Ensure the input voltage jumper (J4) is set correctly for 115VAC or 230VAC operation before powering on. Regularly inspect wiring terminals for tightness and check the enclosure for dust accumulation; keep the unit clean to maintain optimal cooling and performance. Avoid operation in environments with excessive moisture, corrosive gases, or conductive contaminants.