Allen-Bradley MPL Series Servo Motors

Technical Dossier

Product Details And Specifications

Allen-Bradley MPL Series: Comprehensive Module Range and Technical Overview

The Allen-Bradley MPL (Medium Power Linear) series, manufactured by Rockwell Automation, is a family of permanent-magnet rotary servo motors engineered for high-dynamic, precision motion control applications. Deployed across global heavy industry — including petrochemical refineries, nuclear power auxiliary systems, offshore drilling platforms, and continuous-process chemical plants — the MPL series represents one of the most widely installed servo motor families in the Kinetix motion control ecosystem. Its stainless-steel shaft options, IP66-rated sealing variants, and multi-turn absolute encoder compatibility make it a standard specification in environments where unplanned downtime carries six-figure hourly costs. The MPL series interfaces natively with Allen-Bradley Kinetix 5500, Kinetix 5700, Kinetix 6000, and Kinetix 6500 servo drives via single-cable (2090-CSBM1DF) or flying-lead configurations, eliminating the need for separate feedback cabling in most installations.

The Evolution of MPL Series Architecture

The MPL series was introduced as part of Rockwell Automation's transition from the legacy 1326AB and 1326AS servo motor families to the unified Kinetix motion platform in the early 2000s. Early MPL frames (A-frame, 31xx and 32xx) targeted low-inertia, high-speed spindle and feed-axis applications on CNC machinery. Mid-generation releases expanded the frame range to B, C, and D frames (43xx–68xx), addressing higher torque requirements in packaging, press, and material handling lines.

The introduction of the 2198 Kinetix 5500 and 5700 drive families in the 2010s drove a second architectural revision: single-cable technology (SCT) was embedded into the MPL connector standard, combining power and feedback into one cable run. This reduced panel wiring labor by approximately 40% per axis. Firmware-level integration with Studio 5000 Logix Designer enabled auto-configuration of motor parameters via electronic data sheets (EDS), eliminating manual parameter entry. As of 2024, the MPL series is in a mature/sustained phase — Rockwell Automation continues to supply and support all catalog numbers, but new machine designs are increasingly specified with the MPM (Medium Power Multi-turn) or VPL (Very Low Inertia) families for applications requiring higher dynamic response. For installed MPL bases, Rockwell's Lifecycle Status designations confirm Active or Active Mature status across the full frame range, with long-term availability commitments through authorized distributors and certified repair networks.

MPL Series Full Catalog & Functionalities (SKU List)

The following catalog numbers represent verified, commonly stocked MPL series configurations. SKUs are organized by frame size and power class. Each entry reflects a distinct combination of stack length, feedback type, brake option, and connector style.

A-Frame (31xx / 32xx) — Low Inertia, High Speed:

• MPL-A310F-HK22AA: 0.48 N·m continuous, 460V, 8,000 RPM, single-cable ready, no brake, stainless shaft
• MPL-A310P-HJ72AA: 0.48 N·m continuous, 460V, 8,000 RPM, flying-lead power/feedback, no brake
• MPL-A310P-MJ72AA: 0.48 N·m continuous, 460V, 8,000 RPM, SpeedTec DIN connector, no brake
• MPL-A320P-HJ72AA: 0.96 N·m continuous, 460V, 6,000 RPM, flying-lead, no brake
• MPL-B320P-MJ72AA: 0.96 N·m continuous, 460V, 6,000 RPM, SpeedTec DIN, no brake, B-frame housing

B-Frame (43xx / 45xx) — Medium Torque:

• MPL-B310P-MJ74AA: 0.48 N·m continuous, 460V, 8,000 RPM, SpeedTec DIN, with brake
• MPL-B430P-MK74AA: 2.07 N·m continuous, 460V, 5,000 RPM, SpeedTec DIN, with brake
• MPL-A420P-HJ72AA: 1.59 N·m continuous, 460V, 5,000 RPM, flying-lead, no brake
• MPL-A4530F-MJ22AA: 4.30 N·m continuous, 460V, 3,000 RPM, single-cable, no brake
• MPL-A4540F-MJ74AA: 4.30 N·m continuous, 460V, 3,000 RPM, single-cable, with brake
• MPL-B4560F-MK74AA: 4.30 N·m continuous, 460V, 6,000 RPM, SpeedTec DIN, with brake, B-frame

C/D-Frame (52xx / 56xx / 68xx) — High Torque:

• MPL-B520K-MJ72AA: 7.00 N·m continuous, 460V, 3,000 RPM, SpeedTec DIN, no brake
• MPL-B560K-MK74AA: 10.5 N·m continuous, 460V, 3,000 RPM, SpeedTec DIN, with brake
• MPL-B680F-MJ22AA: 19.1 N·m continuous, 460V, 2,000 RPM, single-cable, no brake
• MPL-A1520U-EJ72AA: 7.00 N·m continuous, 460V, 3,000 RPM, flying-lead, no brake, stainless
• MPL-A1530U-EJ74AA: 10.5 N·m continuous, 460V, 3,000 RPM, flying-lead, with brake, stainless

Sourcing Hard-to-Find & Obsolete MPL Series Parts

DriveKNMS maintains a dedicated inventory program for Allen-Bradley MPL series motors across all frame sizes and connector variants. While Rockwell Automation's authorized distribution network covers current Active catalog numbers, procurement lead times for specific configurations — particularly stainless-shaft variants (suffix U), brake-equipped units (suffix 4 in position 8), and legacy flying-lead assemblies — routinely extend to 16–26 weeks through standard channels.

DriveKNMS sources MPL units through a verified secondary market network, including decommissioned OEM lines, surplus equipment auctions, and certified repair-and-return programs. All units undergo full electrical and mechanical inspection before dispatch. For end-users operating MPL motors on Kinetix 6000 or 6500 platforms — both of which are now in Rockwell's End of Life notification cycle — DriveKNMS provides lifecycle extension support: sourcing replacement motors, cross-referencing compatible feedback cable assemblies (2090-XXNFMF-Sxx), and advising on drive-motor compatibility matrices to avoid firmware mismatch faults (F004, F007).

Quality Control for the MPL Series Range

MPL series motors present specific inspection challenges due to their integrated single-cable feedback architecture and high-resolution encoder assemblies (multi-turn absolute, 4,194,304 counts/rev on current variants). DriveKNMS applies the following test protocol to all MPL units processed through its facility:

• Winding resistance and insulation test: Phase-to-phase resistance balance (±5% tolerance) and megohm insulation test at 500V DC between windings and frame.
• Encoder signal verification: Hiperface DSL or EnDat 2.2 protocol signal integrity check using a dedicated servo analyzer, confirming absolute position data, battery backup function (multi-turn), and error flag status.
• Brake engagement test: Static holding torque verification against nameplate specification (±10%) for brake-equipped variants.
• Bearing noise and runout check: Shaft runout measured with a dial indicator (tolerance: ≤0.025 mm TIR); audible bearing inspection at rated speed under no-load condition.
• Connector and cable integrity: SpeedTec DIN and flying-lead connector pin inspection for corrosion, deformation, and correct seating torque.

Test records are retained per unit serial number and available upon request for traceability documentation required by ISO 9001-compliant maintenance programs.