Product Description

Model Number Interpretation

• 40: 40 horsepower rated motor power.

• C: MaxPak Plus series (DC drive family).

• 74: 480V AC input voltage and matching hardware configuration for this power rating。

Technical Specifications

• Motor Power: 40 HP (30 kW) continuous.

• Input Voltage: 480 VAC ±10%, 3‑phase, 50/60 Hz.

• Output Voltage: 0–480 VDC armature; adjustable field supply.

• Output Current: 52 ADC continuous armature current.

• Control Mode: Four‑quadrant regenerative (forward/reverse, motoring/regenerating).

• Speed Range: 10:1 base; field weakening for extended high‑speed operation.

• Regeneration: Full regenerative braking, no contactor reversal needed.

• Protection: Overcurrent, overvoltage, undervoltage, overtemperature, short‑circuit, field‑loss protection.

• Ambient Temperature: 0 °C to +45 °C.

• Storage Temperature: ‑20 °C to +70 °C.

• Humidity: 5%–90% non‑condensing.

• Enclosure: Open chassis (NEMA 1), panel‑mounted.

• Weight: ~25 kg.

Interface & Communication Configuration

• Power Terminals: 3‑phase AC input, DC armature/field output.

• Control I/O: Screw terminals for start/stop, forward/reverse, 0–10VDC/4–20mA speed reference, fault reset.

• Feedback: Tachometer or encoder input for closed‑loop speed control.

• Communication: No native Ethernet; optional serial modules for legacy PLC/DCS integration.

• Diagnostics: Front‑panel LEDs for power, run, fault, regeneration status; no built‑in display。

Core Functions

• Precise Regulation: Closed‑loop feedback ensures accurate speed/torque control.

• Four‑Quadrant Operation: Smooth direction change and regenerative braking for fast, controlled stops.

• Energy Efficiency: Regenerative braking feeds kinetic energy back to the AC line.

• Field Weakening: Extends motor speed above base speed for high‑speed applications.

• Robust Protection: Comprehensive fault protection safeguards drive and motor.

• Legacy Compatibility: Matches Reliance DC motors and existing control systems。

Application Scenarios

• Heavy industry: Steel mills, metal rolling, mining.

• Process automation: Paper mills, cement plants, extruders.

• Material handling: Cranes, hoists, conveyors.

• Machine tools: Heavy‑duty lathes, mills, grinders.

• Legacy system maintenance: Direct replacement for aging MaxPak drives。

Difference from 40C72

• 40C72: 460V AC input.

• 40C74: 480V AC input; power section components and voltage calibration adjusted for 480V operation.