Description

Product Overview

The Allen‑Bradley 1391-DES45 is a digital single-axis AC servo drive from Bulletin 1391-DES series, built to pair with Allen‑Bradley 1326AB brushless servo motors for high-performance closed-loop motion control. This 45A continuous unit delivers precise velocity, torque and position regulation via analog command signals and resolver feedback, with a built-in shunt regulator to absorb regenerative energy during fast deceleration. It resolves poor low-speed stability and positioning inaccuracy in legacy machine axes, maintaining tight speed regulation even under heavy dynamic load variations. Motion control engineers and maintenance teams rely on this drive for retrofits and spare replacement on legacy CNC, press and indexing automation equipment. The front-mounted programming panel and LCD enable local parameter tuning and fault review, while integrated current and voltage protection safeguards power semiconductors from overload and transient damage. Word count overview:173

Technical Specifications

• Product Model: 1391-DES45
• Brand: Allen‑Bradley
• Warranty: One Year
• Input Voltage: 230 V AC three-phase, 50/60 Hz (requires matching isolation transformer)
• Operating Temperature: 0 °C to 60 °C
• Storage Temperature: -40 °C to 85 °C
• Response Time: High bandwidth current and velocity loop, fast torque response
• Protection Class: IP20, cabinet mount
• Accuracy Class: ±0.05% speed regulation across load variation
• Output Frequency: PWM carrier 2500 Hz
• Rated Current Range: 45 A continuous; 90 A peak
• Communication Interface: Analog command inputs; resolver feedback; A Quad B encoder output; front programming panel
• Supported Protocols: Analog velocity/torque command, resolver closed-loop feedback
• Overload Capacity: 200% peak current short duration; overvoltage, overcurrent and over-temperature protection
• Dimensions: Standard 1391-DES chassis form factor
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Application Scenarios

• CNC Machine Tool Axis Control: This servo drive powers heavy-duty linear axes on legacy milling and cutting machines. The 1391-DES45 maintains consistent torque during rapid traverse and cutting cycles, and resolver feedback retains positioning accuracy under shock and thermal cycling.
• Servo Press Forming Operation: Installed on hydraulic replacement servo press axes, the unit delivers high peak torque for forming cycles. Built-in shunt regulation safely dissipates regenerative energy when retracting the ram, preventing overvoltage trips.
• Rotary Indexing Packaging Machinery: The drive controls high-speed rotary turrets for filling and capping lines. Fast acceleration and stable low-speed performance maintain precise product positioning for synchronized tooling cycles.