Allen Bradley MPL-A420P-HJ72AA Servo Motor
Original price was: $4,700.00.$2,445.00Current price is: $2,445.00.
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Allen Bradley MPL-A420P-HJ72AA Low-Inertia Brushless Servo Motor
The Allen-Bradley MPL-A420P-HJ72AA is a high-performance, permanent magnet AC synchronous brushless servo motor engineered within Rockwell Automation’s premium MP-Series™ (Low Inertia) line. Developed specifically to satisfy high-throughput, high-dynamic industrial automation applications, this motor combines high torque-to-size ratios with reduced rotor inertia to maximize acceleration rates and system responsiveness.
The physical construction features a 115 mm (Frame Size 4) IEC-metric mounting flange with free mounting holes (Type FF), a keyed shaft extension, and standard IP50 environmental housing (upgradeable to IP65/IP66 with field-installed shaft seals and sealed mating cordsets). Electrical interconnections utilize factory-installed dual circular SpeedTEC® DIN connectors oriented at a right angle with 180º rotational adjustability for flexible cable dressing.
Key Features
- High Acceleration-to-Inertia Ratio: Low rotor inertia driven by high-energy neodymium-iron-boron (NdFeB) rare-earth magnets enables rapid cycle-time response without mechanical hunting or resonance.
- SpeedTEC® Dual Quick-Turn Connectors: Equipped with dual rotatable DIN connectors for separate power and feedback lines, ensuring secure quick-lock engagement, vibration immunity, and high shield termination efficiency.
- 2000-Line Incremental Closed-Loop Feedback: Provides high-resolution positional tracking (quadrature interpolated to 8,000 counts/turn) with integrated commutating tracks for seamless synchronization with Kinetix servo drives.
- Field-Configurable Ingress Protection: Retains an IP50 baseline rating with an unsealed front bearing; easily field-upgradable to IP66 washdown protection by fitting an optional fluoroelastomer or nitrile shaft seal kit (Rockwell P/N MPL-SSN-A4B4).
Technical Specifications
| Specification Parameter | Engineering Value / Rating |
|---|---|
| Manufacturer & Series | Allen-Bradley / Rockwell Automation (MP-Series Low Inertia) |
| Manufacturer Part Number (MPN) | MPL-A420P-HJ72AA |
| Voltage Class / Line Input | 200V Class (Three-Phase 230V AC RMS) |
| Rated Mechanical Speed | 5000 RPM |
| Rated Continuous Power Output | 2.0 kW (2.68 HP) |
| Continuous Stall Torque (Tc) | 4.74 N·m (42.0 lb·in) |
| Peak Stall Torque (Tp) | 10.2 N·m (90.0 lb·in) |
| Continuous Stall Current (0-to-peak / RMS) | 12.7 A (0-pk) / ~9.0 A (RMS) |
| Peak Stall Current (0-to-peak) | 46.0 A (0-pk) |
| Rotor Moment of Inertia (Jm) | 0.00026 kg·m² (0.0023 lb·in·s²) |
| Frame Size & Magnet Stack Length | Frame 4 (115 mm / 4.53 in.) | Stack 20 (50.8 mm / 2.0 in.) |
| Feedback Mechanism | 2000 Lines/Rev Incremental Optical Encoder (Commutating) |
| Shaft Details | Keyed Shaft Extension; Factory Standard Without Shaft Seal |
| Holding Brake Option | None (Code 2 – Free Rotating) |
| Ingress Protection Rating | IP50 (Standard) / IP66 (With optional shaft seal MPL-SSN-A4B4) |
| Connection Style | Dual SpeedTEC DIN Right-Angle Receptacles (180° Rotatable) |
| Winding Thermal Insulation Class | Class F (155°C) with internal embedded thermal sensor |
| Approximate Net Weight | 4.51 kg (9.94 lbs) |
Servo Drive Compatibility
- Allen-Bradley Kinetix 6000 Multi-Axis Servo Drives: 2094-BC01-M01-S, 2094-BC02-M02-S (via 200V IAM/AM modules).
- Allen-Bradley Kinetix 6500 Drives: 2094-EN02D-M01-S EtherNet/IP enabled servo drives.
- Allen-Bradley Kinetix 300 / 350 Compact Servo Drives: 2097-V34PR5-LM, 2097-V33PR6 (utilizing incremental feedback terminal interfaces).
- Allen-Bradley Kinetix 2000 Multi-Axis Drives: 2093-AC05-MP5 multi-axis systems.
- Legacy Ultra 3000 Series: 2098-DSD-010 / 2098-DSD-020 (operating on 230V line potential).
Applications
- Rotary Indexing & Cam Tables: High acceleration dynamic performance ensures rapid move-and-dwell profiles in rotary pick-and-place automation.
- Packaging Machines (Form, Fill, and Seal): Continuous stop-start feed axes, flying sheers, and carton collation requiring 5000 RPM velocities and rapid cyclic corrections.
- CNC Workpiece Feeds & Tool Changers: Precision positioning with zero mechanical backlash via keyed shaft and tight positioning loop control.
- Converting & Printing Machinery: Web tension handling, label feed, and unwind/rewind tensioners operating in low-voltage 230V infrastructures.
- Marine & Offshore Deck Robotics: Automated conveyor transfer, pipe handling feed mechanisms, and marine control-surface actuators isolated within dry electrical cabinets.
Frequently Asked Questions
What does the “HJ” code indicate in part number MPL-A420P-HJ72AA?
The “H” indicates that the motor is built with an integrated 2000 lines-per-revolution commutating incremental optical encoder. The “J” denotes a keyed shaft extension manufactured without a factory shaft seal (providing standard IP50 dust ingress resistance).
Can this motor operate on a 400V / 480V Kinetix drive system?
No. The MPL-A420P-HJ72AA is wound exclusively for the 200V voltage class (optimally operating on 230V AC 3-phase input). Connecting this motor to a 400V/480V inverter bus (such as an MPL-B series configuration) will degrade the winding insulation, induce high-voltage inter-turn arc flashovers, and trigger continuous bus overvoltage faults.
Can I run this motor on a third-party variable frequency drive (VFD)?
No. This is a brushless AC synchronous permanent magnet servo motor that requires a closed-loop servo controller capable of commutation tracking (via Hall tracks) and sinusoidal PWM excitation. Running it on a standard scalar (V/Hz) induction motor inverter will result in severe locked-rotor overcurrent conditions.
Does the MPL-A420P-HJ72AA have an internal mechanical holding brake?
No. Position “2” in the part nomenclature identifies this motor as a non-brake unit. For vertical axis applications subject to downward mechanical gravity drops upon power failure, install an external mechanical brake or substitute with part number MPL-A420P-HJ74AA (which features an internal 24V DC spring-set holding brake).
How do I adapt this motor for full washdown IP66 protection?
Install the genuine Allen-Bradley fluoroelastomer shaft seal kit (Part # MPL-SSN-A4B4) over the motor shaft extension, ensure properly seated SpeedTEC mating cables with intact O-rings, and loop cable drip lines beneath the junction points. This upgrades the front bearing interface from IP50 to IP66 standards.
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