Description
Allen‑Bradley MPL-A320H-MJ74AA – Low‑Inertia Kinetix Servo Motor for Fast, Precise Motion
The Allen‑Bradley MPL-A320H-MJ74AA is part of the MP-Series Low Inertia (MPL) family, built for high responsiveness and tight positioning in multi‑axis machines. From my experience, this model sits in the sweet spot for packaging lines, electronic assembly, indexing stations, and pick‑and‑place axes where quick acceleration and repeatable accuracy are non‑negotiable. You might notice that it pairs especially well with 400/460 V‑class Kinetix drives, making it a reliable drop‑in for many Rockwell Automation platforms.
Company’s Order Placement Process and Guarantees
- Warranty: 365 days
- Lead time: 1 week if in stock; no more than one month at the latest
- Payment: 50% advance; full payment before delivery
- Express delivery: FedEx, UPS, DHL
Key Features
- Low inertia rotor – Delivers fast start/stop performance, ideal for short‑cycle moves and tight takt times.
- H winding for 400/460 V‑class systems – Typically matched to Kinetix 5500/5700 drives for global plants standardizing on higher bus voltages.
- High‑resolution absolute feedback – The MJ7x feedback option provides absolute position so homing routines can be reduced or eliminated after power cycles.
- Integrated holding brake (24 Vdc) – The “4” option in MJ74 indicates a fail‑safe brake for vertical axes or emergency stop holding.
- Compact A3 frame with high torque density – Helps you keep machine footprints tight without giving up performance.
- IP‑rated connectors and housing – In most cases, IP65 is achievable when mated and sealed properly; great for industrial environments with dust or washdown splash.
- Rockwell Automation ecosystem – Seamless integration with Studio 5000 and Kinetix drives typically shortens commissioning time.
Where it’s commonly used
- Packaging machines: Form‑fill‑seal, rotary cutters, and infeed conveyors that need crisp registration.
- Electronics assembly: Screwdriving, placement heads, and small gantries with frequent reversals.
- Material handling: Diverters and index tables requiring high throughput but smooth motion.
- Process auxiliary axes: Knife edges, unwinders/rewinders, and timing belts synced to master lines.
Technical Specifications
| Brand / Model | Allen‑Bradley MPL-A320H-MJ74AA (MP‑Series Low Inertia) |
| HS Code | 8501.52 (AC motors > 750 W and ≤ 75 kW, servo type) |
| Power Requirements | 400/460 V‑class Kinetix DC bus (H winding); 24 Vdc for brake control (if applied) |
| Operating Temperature | 0 to +40 °C ambient (typical for MP‑Series) |
| Signal I/O Types | Absolute encoder feedback (Hiperface family), integrated thermal sensor, brake control leads (MJ74 option) |
| Communication Interfaces | Feedback via Hiperface to Kinetix drives through 2090 feedback cabling; motor has no fieldbus interface |
| Installation Method | IEC B5 face mount, A3 frame (100 mm‑class); keyed output shaft |
| Protection | Up to IP65 when mated/sealed correctly (housing and connectors) |
| Brake | 24 Vdc fail‑safe holding brake (indicated by “4” in MJ74) |
| Cooling | Natural convection (surface cooled) |
Related or Supporting Products
- Kinetix 5500 (2198) – 400/460 V‑class multi‑axis drives that typically pair well with H‑winding MPL motors.
- Kinetix 5700 (2198) – Higher power, integrated safety; suited for larger machines or multi‑axis gantries.
- Kinetix 7000 (2099) – For high‑power single‑axis requirements; useful when axes scale up.
- Cabling – 2090-CPBMx-xxx (power) and 2090-UXNFBMP-xxx (feedback) cable families; right‑angle and straight backshells available.
- Alternative motors – MPL-A330x (higher torque, same family), or Kinetix VPL 100 mm‑class low‑inertia motors if you prefer the newer platform.
One thing I appreciate is how quickly this model tunes on a modern Kinetix axis—customers typically report stable loops with minimal manual tweaks. A packaging client swapped to MPL-A320H-MJ74AA on a vertical axis and noted steadier brake holds and fewer re‑homes after e‑stops, which seems to be the result of the absolute feedback plus the matched Kinetix brake control.
Installation & Maintenance
- Mounting – Face‑mount to a rigid panel or machine plate; align the shaft carefully to avoid bearing preload. Use the specified key and correct coupling fit.
- Cabinet & environment – Keep drives in a ventilated cabinet (IEC cabinet with adequate clearance). Motor area should be free of oil spray pooling; IP65 is achievable when connectors and seals are correctly mated.
- Wiring – Use 2090‑series power/feedback cables of the correct length. Route power and feedback separately where possible to reduce noise.
- Grounding – Bond motor frame to protective earth; ensure continuity through machine structure.
- Brake control – Drive‑controlled 24 Vdc brake; verify release timing during commissioning, especially on vertical axes.
- Routine maintenance – Inspect connectors and cable strain relief quarterly, clean dust from fins, and check shaft seals. Firmware updates are handled in the drive (not the motor), but a quick autotune refresh after mechanical changes typically helps.
- Safety – Lock out power before servicing. Verify no back‑driving forces on the shaft when the brake is released.
Quality & Certifications
- CE marking and UL/cUL recognition for industrial use
- RoHS compliant materials in many cases
- Manufacturer’s standard warranty is typically 12 months; our supply warranty is 365 days as stated above
If you’re standardizing on Kinetix and want a low‑inertia motor that accelerates fast without complicating tuning, MPL-A320H-MJ74AA is a strong, field‑proven choice. If you can share your axis torque/speed profile or drive model, I can double‑check cable part numbers and confirm continuous vs. peak torque headroom before you place the order.
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