Basic Information

Manufacturer: Allen‑Bradley (Rockwell Automation)

Origin: United States

Appearance: Vertical cabinet type, with door

Weight: Approximately 20.4 kg

Installation: Floor-standing or cabinet installation

Status: Classic in service / Common spare parts

Certifications: CE, UL/CSA

Functionality

High-performance speed control and regenerative braking control for industrial DC motors

Suitable for applications requiring four-quadrant operation, rapid braking, and energy feedback to the grid

Built-in microprocessor, programmable: preset speed, point operation, current limiting, ramp, etc.

Supports independent control of armature and excitation, compatible with shunt DC motors

Standard feedback (recycling) rectifier unit, energy returned to the grid for energy saving

Core parameters

Input: 3-phase AC 380/415/460V, 50/60Hz, 115A

Armature output: DC 400/400/500V, 140A

Excitation output: DC 250/270/300V, 20A

Rated power: 56kW / 75HP

Short-term peak current: 150% of rated

Control method: Armature voltage speed control + excitation weak magnetic speed control

Communication: Supports DF1, DH485, Modbus (with communication card)

Operating temperature: 0°C ~ +55°C

Protection: Overcurrent, overvoltage, undervoltage, overheating, demagnetization, ground fault

Compatible motors and accessories

Compatible: 75HP shunt DC motor (armature 400–500V, excitation 250–300V)

Optional components:

Discrete quantity I/O card (24V DC)

Communication interface card (Port B)

Encoder feedback card

Supplementary items: DC contactors, braking resistors (non-recycling type), inductor, filter

Typical applications

Metallurgy: Rolling mills, conveyor belts, winding machines / unwinding machines (four-quadrant, rapid forward and reverse rotation)

Papermaking: Rewinding machines, paper machine drive (high-precision tension control)

Aerospace: Cranes, elevators (regenerative braking, smooth speed control)

Extrusion / Cable: Extruders, drawing machines (constant torque / constant power)

Mining: Conveyor belts, crushers (heavy-load start-up, energy-saving feedback)