Introduction

The Allen Bradley MPL-B310P-MK74AA Servo Motor is a high-performance member of the MP-Series MPL low-inertia servo motor family. It is designed around a 460 V class AC motor architecture, a 100 mm frame, 25.4 mm magnet stack, and 5000 RPM operating capability.

One of its key features is the multi-turn high-resolution absolute encoder, which provides the feedback required for precise closed-loop motion control. This makes the motor a practical choice for automated machinery where accurate positioning and repeatable motion are more important than simply achieving basic rotational movement.

The integrated 24 V DC holding brake adds another useful feature for machine builders. When correctly controlled, the brake can help hold a stationary axis when the servo system is disabled. This is particularly useful in machinery where the load must remain in position during power-down or servo disable conditions.

The motor also uses a keyless shaft extension and a rotatable SpeedTEC DIN connector. These mechanical and connection options can simplify integration into compact machine designs.

For replacement projects, machine upgrades, and spare-parts inventory, the MPL-B310P-MK74AA is an attractive option for users already working with Allen-Bradley motion-control equipment. Before ordering, engineers should verify motor voltage, feedback type, brake configuration, shaft style, connector configuration, and drive compatibility against the existing system.

Technical Specifications

Specification	MPL-B310P-MK74AA
Brand	Allen Bradley / Rockwell Automation
Product Family	MP-Series MPL
Product Type	Low-Inertia AC Servo Motor
Model	MPL-B310P-MK74AA
Rated Voltage	460 V AC
Voltage Class	400 V class
Rated Speed	5000 RPM
Continuous Stall Torque	1.58 N·m
Peak Torque	3.61 N·m
Continuous Rated Power	Approx. 0.77 kW
Frame Size	100 mm (3.94 in.)
Magnet Stack Length	25.4 mm (1.0 in.)
Feedback	Multi-Turn High-Resolution Absolute Encoder
Feedback Type	Hiperface absolute feedback
Shaft	Keyless Shaft Extension
Brake	24 V DC Holding Brake
Connector	SpeedTEC DIN, Right Angle
Connector Rotation	180° Rotatable
Mounting	IEC Metric, Free Mounting Holes, Type FF
Motor Construction	Brushless Permanent-Magnet Servo Motor
Cooling	Natural/Convection Cooling
Operating Temperature	Typically up to 40°C under specified conditions
Frame Size / Main Dimension	100 mm
Magnet Stack Dimension	25.4 mm
Weight	2.70 kg (5.95 lb)

Important: Motor performance depends on the complete servo system, including the selected drive, feedback configuration, cable set, mechanical load, acceleration profile, and operating environment.

Recommended Related Models

Model	Product Type	Key Configuration
MPL-B310P-MJ72AA	Servo Motor	Multi-turn absolute feedback, keyed shaft, no brake
MPL-B310P-MJ74AA	Servo Motor	Multi-turn absolute feedback, keyed shaft, 24 V DC brake
MPL-B310P-MK72AA	Servo Motor	Multi-turn absolute feedback, keyless shaft, no brake
MPL-B310P-MK74AA	Servo Motor	Multi-turn absolute feedback, keyless shaft, 24 V DC brake
MPL-B310P-HK72AA	Servo Motor	Incremental feedback, keyless shaft, no brake
MPL-B310P-HK74AA	Servo Motor	Incremental feedback, keyless shaft, 24 V DC brake
MPL-B310P-SK74AA	Servo Motor	Single-turn high-resolution feedback, keyless shaft, 24 V DC brake

These models are useful alternatives to consider when selecting a different encoder, shaft, or brake configuration within the Allen-Bradley MPL servo motor family.

Popular Related Models

Model	Product Family	Typical Application Focus
MPL-B310P-MJ74AA	MP-Series MPL	Precision motion with keyed shaft and brake
MPL-B310P-MK72AA	MP-Series MPL	High-speed motion without motor brake
MPL-B310P-MK74AA	MP-Series MPL	High-speed absolute-feedback motion with brake
MPL-B310P-MJ72AA	MP-Series MPL	Precision positioning with keyed shaft
MPL-B310P-HK72AA	MP-Series MPL	Incremental-feedback motion applications
MPL-B310P-HK74AA	MP-Series MPL	Incremental feedback with holding brake
MPL-B310P-SK74AA	MP-Series MPL	Single-turn absolute feedback with brake

For industrial automation spare-parts planning, keeping the exact catalog number is especially important because encoder type, shaft configuration, brake option, and connector configuration can differ between otherwise similar MPL motor models.

Applications

The MPL-B310P-MK74AA can be used in a wide range of automated motion systems where controlled acceleration, positioning accuracy, and repeatable motor response are required.

Packaging and Material Handling
The motor is suitable for conveyors, indexing mechanisms, pick-and-place systems, packaging equipment, and automated material handling. Its high-speed capability allows machine builders to achieve rapid positioning cycles without sacrificing servo control.

Assembly Machinery
The motor can be integrated into automated assembly stations where components must be positioned consistently. Multi-turn absolute feedback helps the control system maintain accurate position information across the motor's operating range.

CNC and Precision Machinery
The low-inertia design is beneficial for applications involving frequent acceleration and deceleration. It can support machine axes requiring responsive servo performance and repeatable positioning.

Printing and Converting Equipment
Printing, labeling, cutting, winding, and converting machines often require synchronized motion between multiple axes. The MPL-B310P-MK74AA can provide the controlled rotary motion required for these applications.

Robotics and Automated Production Lines
When paired with a compatible Allen-Bradley motion control platform, the servo motor can be used in automated production equipment requiring coordinated axis movement.

Machine Retrofit Projects
For existing Allen-Bradley motion systems, the MPL-B310P-MK74AA can be considered when replacing or upgrading an MPL-series servo motor while maintaining a familiar Rockwell Automation motion-control architecture.

Advantages

Low-Inertia Servo Construction
The MPL series is designed around low-inertia brushless servo technology. This allows the motor to respond quickly to changes in command speed and position, making it practical for applications with frequent dynamic movement.

Multi-Turn High-Resolution Absolute Feedback
The MPL-B310P-MK74AA uses a multi-turn high-resolution absolute encoder. This provides detailed position feedback for demanding motion applications and reduces dependence on conventional incremental positioning methods.

5000 RPM High-Speed Operation
With a rated speed of up to 5000 RPM, the motor can support high-cycle machinery and applications where fast rotary movement is an important part of machine productivity.

Integrated 24 V DC Brake
The built-in 24 V DC holding brake provides an additional mechanical holding function when the servo axis needs to remain stationary, particularly in applications where load retention is important.

Keyless Shaft Design
The keyless shaft extension provides a clean mechanical interface and can simplify certain coupling arrangements when the correct shaft-hub connection method is used.

Flexible Connector Orientation
The SpeedTEC DIN connector uses a right-angle configuration and can be rotated through 180 degrees. This can make cable routing easier during machine integration.

IEC Metric Mounting
The 100 mm IEC metric frame and free mounting-hole configuration make the motor suitable for a broad range of industrial machine designs.

Technical FAQs

1. What type of feedback does the MPL-B310P-MK74AA use?
The motor uses a multi-turn high-resolution absolute encoder. This feedback arrangement provides detailed position information for closed-loop servo control and is particularly useful for applications requiring accurate axis positioning.

2. What is the rated speed of the MPL-B310P-MK74AA?
The specified motor speed is 5000 RPM. The actual operating speed should always be configured according to the connected servo drive, application load, acceleration profile, and motor operating conditions.

3. Does the MPL-B310P-MK74AA have a holding brake?
Yes. This model includes a 24 V DC brake. The brake is intended primarily for holding the motor/load when the servo system is not actively controlling motion. It should not normally be treated as a dynamic stopping device.

4. What shaft configuration does this servo motor have?
The MPL-B310P-MK74AA uses a keyless shaft extension. When installing a coupling or other mechanical transmission component, the coupling manufacturer's recommended clamping and alignment procedure should be followed.

5. What connector is used on this motor?
The motor uses a SpeedTEC DIN connector with a right-angle configuration. The connector can be rotated 180 degrees, which provides greater flexibility for cable installation and machine layout.

6. Which Allen-Bradley motion systems can be used with the MPL-B310P-MK74AA?
Compatibility depends on the complete motor/drive combination and the required feedback interface. MPL-series motors are commonly integrated into Allen-Bradley Kinetix motion architectures. The exact drive, cable, feedback configuration, and firmware compatibility should be checked before commissioning.

7. How should the motor brake be wired?
The 24 V DC brake should be wired according to the applicable Allen-Bradley motor and drive installation documentation. Brake control should be coordinated with the servo enable sequence so that the brake is not released or applied at inappropriate times.

8. What should be checked if the motor generates an encoder or feedback fault?
Inspect the feedback cable, connectors, shielding, grounding, connector seating, and drive feedback configuration first. If the problem remains, check the motor feedback device and servo drive diagnostics. Intermittent feedback faults can also result from damaged cables or excessive electrical noise.

9. What is important during servo motor commissioning?
Verify motor catalog data, drive configuration, feedback selection, direction of rotation, brake operation, acceleration and deceleration limits, and mechanical coupling before placing the machine into automatic operation. A controlled low-speed test is recommended after installation.

10. How can the MPL-B310P-MK74AA be maintained for long-term operation?
Regularly inspect motor mounting, mechanical coupling, cable connections, connector condition, brake operation, and abnormal vibration or noise. Keep the motor within its specified environmental and thermal conditions and investigate changes in current, temperature, or positioning performance before they develop into larger system problems.

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