Product Introduction

Model Interpretation

• 50 = 50 horsepower rating

• F = FlexPak 3000 series

• N = Non‑regenerative (no four‑quadrant operation)

• 4031 = 460 VAC input, standard control firmware

Technical Parameters

• Power rating: 50 HP (37 kW)

• Input voltage: 460 VAC, 3‑phase, 50/60 Hz

• Output: DC armature voltage 0–460 VDC

• Full load AC line current: ~78 A

• Full load DC armature current: ~90 A

• Field current: Adjustable (typically 5–15 A)

• Enclosure: Chassis‑style (open frame)

• Control: Microprocessor‑based, speed/torque regulation

• Communication: Optional serial/network modules

• Operating temperature: 0 °C to +45 °C

• Status: Discontinued; available as surplus/refurbished

Interface & Communication

• Power terminals: 3‑phase AC input, DC armature output, DC field output

• Control terminals: Start/stop, speed reference, fault signals

• Front panel: Keypad and LED display for setup and monitoring

• Optional: RS‑232/485, Profibus, or DeviceNet communication modules

Core Functions

• Speed control: Closed‑loop regulation with tachometer or encoder feedback

• Torque control: Adjustable current limit for constant‑torque operation

• Overload protection: Electronic overload, short‑circuit, and ground‑fault protection

• Field weakening: Extended speed range above base speed

• Diagnostics: Built‑in fault logging and parameter monitoring

Application Scenarios

• Conveyors: Mining, material handling, and assembly lines

• Machine tools: Lathes, mills, and grinders requiring precise speed control

• Extruders: Plastic and rubber processing machinery

• Pumps/fans: Variable‑speed flow control in HVAC and process systems

Operation & Maintenance

• Mount in a well‑ventilated cabinet; avoid high‑vibration areas

• Connect 3‑phase AC power, DC armature, and field wiring per schematic

• Set parameters via front panel or software: motor nameplate data, speed limits, current limits

• Regularly inspect cooling fans, heat sinks, and wiring connections

• Keep the drive clean; blow out dust periodically

• Discontinued by Reliance Electric; use refurbished units or upgrade to modern AC drives