Introduction

The Allen Bradley MPL-B310P-MJ72AA Servo Motor is an MP-Series MPL low-inertia brushless AC rotary servo motor developed for industrial automation and precision motion-control applications.

This model features a 100 mm frame size and a 25.4 mm magnet stack, providing a compact mechanical configuration for automated machinery. Its 5000 RPM speed rating makes it suitable for applications requiring fast rotary movement and frequent changes in operating speed.

A major characteristic of the MPL-B310P-MJ72AA is its multi-turn high-resolution absolute encoder. Absolute feedback provides the motion system with detailed position information and can be particularly useful in applications where accurate position monitoring is important.

The motor also uses a keyed shaft extension. Compared with keyless configurations, the keyed shaft is designed for mechanical systems using a compatible keyed coupling arrangement. Proper alignment and coupling selection remain important for reliable operation.

The motor's SpeedTEC DIN connector uses a right-angle configuration and can be rotated 180 degrees. This can provide additional flexibility during machine installation and cable routing.

Unlike some other MPL configurations, the MPL-B310P-MJ72AA is supplied without a mechanical brake. This distinction is important when comparing it with similar Allen Bradley servo motors. Applications involving vertical axes or loads that must remain mechanically held should be evaluated carefully before selecting a no-brake configuration.

The MPL-B310P-MJ72AA is designed to operate as part of a complete motion-control system. Servo-drive compatibility, feedback configuration, load inertia, mechanical coupling, acceleration settings, and tuning parameters should all be considered during system design and commissioning.

For OEM equipment manufacturers and industrial maintenance teams, this servo motor offers a practical combination of compact construction, high-speed operation, absolute multi-turn feedback, and responsive low-inertia motion performance.

Technical Specifications

Parameter	Specification
Brand	Allen Bradley
Model	MPL-B310P-MJ72AA
Product Family	MP-Series MPL
Product Type	480V AC Rotary Servo Motor
Motor Type	Low-Inertia Brushless Servo Motor
Voltage	460 V AC
Voltage Class	400 V AC
Frame Size	100 mm
Magnet Stack Length	25.4 mm
Maximum Speed	5000 RPM
Continuous Stall Torque	1.58 N·m
Peak Torque	3.61 N·m
Feedback	Multi-turn High-Resolution Absolute Encoder
Feedback Protocol	Hiperface
Shaft Configuration	Keyed Shaft Extension
Shaft Seal	No Shaft Seal
Connector	SpeedTEC DIN Connector
Connector Position	Right Angle
Connector Rotation	180° Rotatable
Brake	No Brake
Mounting	IEC Metric
Housing	Industrial Servo Motor Housing
Weight	2.70 kg (5.95 lb)

The Allen Bradley MPL-B310P-MJ72AA has a 100 mm frame size and a product weight of 2.70 kg (5.95 lb).

The combination of a 25.4 mm magnet stack and 5000 RPM speed rating gives the motor a compact but responsive configuration for industrial motion systems. Its absolute multi-turn encoder and keyed shaft are particularly important characteristics when selecting this model for a replacement or new machine design.

Before installation, verify the servo drive, feedback interface, motor power connections, shaft coupling, mounting arrangement, and control parameters. Since this model has no brake, applications requiring shaft holding should receive additional mechanical evaluation.

Recommended Related Models

Model	Product Type
MPL-B310P-MJ72AA	MP-Series MPL 480V AC Rotary Servo Motor
MPL-B310P-MJ74AA	MP-Series MPL 480V AC Rotary Servo Motor
MPL-B310P-MK72AA	MP-Series MPL 480V AC Rotary Servo Motor
MPL-B310P-MK74AA	MP-Series MPL 480V AC Rotary Servo Motor
MPL-B310P-HJ72AA	MP-Series MPL 480V AC Rotary Servo Motor
MPL-B310P-HK72AA	MP-Series MPL 480V AC Rotary Servo Motor

These related models can be useful when comparing MP-Series servo configurations. Particular attention should be given to encoder type, shaft design, brake configuration, and electrical characteristics.

Popular Related Models

Model	Product Family	Product Type
MPL-B310P-HJ72AA	MP-Series MPL	480V AC Rotary Servo Motor
MPL-B310P-HJ74AA	MP-Series MPL	480V AC Rotary Servo Motor
MPL-B310P-HK72AA	MP-Series MPL	480V AC Rotary Servo Motor
MPL-B310P-HK74AA	MP-Series MPL	480V AC Rotary Servo Motor
MPL-B310P-MJ72AA	MP-Series MPL	480V AC Rotary Servo Motor
MPL-B310P-MJ74AA	MP-Series MPL	480V AC Rotary Servo Motor
MPL-B310P-MK72AA	MP-Series MPL	480V AC Rotary Servo Motor

When selecting the Allen Bradley MPL-B310P-MJ72AA for replacement or new equipment, always verify the complete catalog number. The 100 mm frame size alone is not enough to establish compatibility because MP-Series motors can differ in feedback, shaft, brake, connector, and electrical configurations.

Applications

The Allen Bradley MPL-B310P-MJ72AA Servo Motor is a low-inertia brushless AC rotary servo motor designed for industrial motion-control applications that require accurate positioning, rapid response, and repeatable movement. With a 100 mm frame size, 25.4 mm magnet stack, 5000 RPM operating speed, and multi-turn high-resolution absolute encoder, this motor is well suited to precision automation equipment.

The MPL-B310P-MJ72AA can be used in automated assembly systems, packaging machinery, converting equipment, material handling systems, electronic assembly machines, indexing systems, and other industrial equipment requiring controlled rotary motion.

Its low-inertia design is particularly useful for machines that frequently accelerate, decelerate, or reverse direction. When correctly matched with a compatible servo drive and properly tuned, the motor can respond efficiently to changing motion commands.

The multi-turn absolute feedback configuration is another important advantage for applications where the control system needs reliable position information. Absolute feedback can reduce the need for repeated position referencing in suitable system architectures and can simplify machine recovery after certain power-cycle conditions.

The motor uses a keyed shaft extension, making it appropriate for mechanical systems designed around a keyed coupling or compatible transmission component. Engineers should verify the coupling dimensions and shaft requirements before installation.

The MPL-B310P-MJ72AA is also suitable for maintenance and replacement projects involving existing Allen Bradley MP-Series motion systems. Because different MPL models can have different feedback and shaft configurations, the complete catalog number should always be verified before ordering a replacement.

Advantages

The MPL-B310P-MJ72AA combines a compact 100 mm frame with a low-inertia brushless servo design. This provides a practical solution for machines where fast dynamic response and limited installation space are both important.

One of its most distinctive features is the multi-turn high-resolution absolute encoder. Compared with a basic incremental feedback configuration, absolute feedback provides additional position information that can be valuable in precision motion-control applications.

The motor is rated for 5000 RPM, giving machine designers flexibility when developing high-speed positioning and rotary-motion applications. Actual operating speed should always be determined according to the drive configuration, load, duty cycle, and machine requirements.

The motor also features a keyed shaft extension. This mechanical configuration provides a positive shaft interface for suitable couplings and mechanical transmission components.

The SpeedTEC DIN connector is positioned at a right angle and can be rotated through 180 degrees. This gives machine designers greater flexibility when routing motor cables, particularly inside compact automation equipment.

Another important characteristic is that the MPL-B310P-MJ72AA does not include a brake. This makes the model particularly suitable for applications where a holding brake is not required and where the machine's mechanical system provides the necessary load-holding function.

With its compact dimensions, absolute multi-turn feedback, keyed shaft, and high-speed capability, the MPL-B310P-MJ72AA is a strong option for precision motion systems where accurate feedback and responsive servo performance are important.

Technical FAQs

1. What type of servo motor is the MPL-B310P-MJ72AA?

The MPL-B310P-MJ72AA is a low-inertia brushless AC rotary servo motor from the Allen Bradley MP-Series MPL family. It is designed for closed-loop industrial motion-control applications.

2. What feedback does the MPL-B310P-MJ72AA use?

This model uses a multi-turn high-resolution absolute encoder. The feedback system provides position information to the compatible motion-control system for closed-loop operation.

3. What is the maximum speed of the MPL-B310P-MJ72AA?

The motor has a rated speed of 5000 RPM. The appropriate operating speed depends on the servo drive, mechanical load, acceleration profile, duty cycle, and application requirements.

4. Does the MPL-B310P-MJ72AA have a brake?

No. The MPL-B310P-MJ72AA is a no-brake configuration. If a machine requires shaft holding after servo power is removed, an appropriate external mechanical holding solution may need to be considered.

5. What is the shaft configuration of this motor?

The motor uses a keyed shaft extension. The mating coupling should be selected according to the shaft dimensions and mechanical requirements of the application.

6. What should be checked when connecting the absolute encoder?

The feedback connector, cable, drive configuration, grounding, and feedback parameters should be checked carefully. The servo drive must support the motor's specific absolute feedback configuration.

7. What can cause an absolute encoder fault?

Possible causes include incorrect feedback configuration, damaged encoder cables, loose connectors, electrical interference, grounding problems, or a malfunction in the feedback device or servo drive.

8. Can the MPL-B310P-MJ72AA be used for repeated positioning applications?

Yes. Its low-inertia construction and multi-turn absolute feedback make it suitable for many positioning applications. Correct servo tuning and appropriate mechanical design are essential for achieving the required positioning performance.

9. Can the MPL-B310P-MJ72AA replace an MPL motor with the same 100 mm frame size?

Not automatically. The frame size is only one selection factor. Feedback type, shaft configuration, brake option, voltage, connector arrangement, torque requirements, and servo-drive compatibility must also be checked.

10. What should be checked if the motor vibrates during operation?

Check servo tuning parameters, mechanical coupling, mounting hardware, load inertia, acceleration and deceleration settings, mechanical resonance, and encoder feedback. Incorrect tuning or mechanical resonance can produce vibration even when the motor itself is functioning correctly.

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