Introduction

The Allen-Bradley MPL-B420P-HK74AA Servo Motor belongs to the MP-Series family of motors used in industrial automation and motion-control systems. It is intended for machinery where precise and repeatable movement is required.

The MPL-B420P-HK74AA features a 115 mm frame size and a specified weight of 4.30 kg (9.48 lb). These mechanical specifications are important for machine mounting, mechanical support, and replacement planning.

Typical applications include packaging machines, assembly equipment, material-handling systems, machine tools, robotics, printing equipment, and automated production lines. When combined with a suitable servo drive, controller, and feedback system, the motor can provide controlled motion across a wide range of machine cycles.

For replacement applications, the complete catalog number should be verified before installation. Similar frame sizes do not necessarily indicate identical electrical ratings, feedback configurations, shaft arrangements, or drive requirements.

Technical Specifications

Specification	Details
Brand	Allen-Bradley
Product Series	MP-Series
Model	MPL-B420P-HK74AA
Product Type	Servo Motor
Motor Family	MPL-B Series
Frame Size	115 mm
Application	Industrial Motion Control
Feedback	Servo feedback system
Installation	Machine-mounted servo axis
Weight	4.30 kg (9.48 lb)

The 115 mm frame size should be considered when determining mounting compatibility and available machine space. The specified 4.30 kg weight should also be included in mechanical load calculations, particularly for moving or vertically mounted axes.

Recommended Related Models

Model	Product Type	Frame Size
MPL-B320P-HJ72AA	MP-Series Servo Motor	100 mm
MPL-B320P-HJ74AA	MP-Series Servo Motor	100 mm
MPL-B320P-HK72AA	MP-Series Servo Motor	100 mm
MPL-B320P-HK74AA	MP-Series Servo Motor	100 mm
MPL-B320P-MJ72AA	MP-Series Servo Motor	100 mm
MPL-B320P-MJ74AA	MP-Series Servo Motor	100 mm
MPL-B320P-MK72AA	MP-Series Servo Motor	100 mm
MPL-B420P-HK72AA	MP-Series Servo Motor	115 mm

Popular Related Models

Model	Product Type
MPL-B310P-SJ74AA	Allen-Bradley Servo Motor
MPL-B310P-SK72AA	Allen-Bradley Servo Motor
MPL-B310P-SK74AA	Allen-Bradley Servo Motor
MPL-B320P-HJ72AA	Allen-Bradley Servo Motor
MPL-B320P-HJ74AA	Allen-Bradley Servo Motor
MPL-B320P-HK72AA	Allen-Bradley Servo Motor
MPL-B420P-HJ72AA	Allen-Bradley Servo Motor
MPL-B420P-HJ74AA	Allen-Bradley Servo Motor
MPL-B420P-HK72AA	Allen-Bradley Servo Motor
MPL-B420P-HK74AA	Allen-Bradley Servo Motor

Applications

The MPL-B420P-HK74AA can be used in a broad range of industrial motion-control applications:

Application	Typical Function
Packaging Machinery	High-speed indexing and positioning
Assembly Equipment	Precise and repeatable movement
Material Handling	Controlled acceleration and axis motion
Machine Tools	Precision axis positioning
Robotics	Servo-driven motion axes
Printing Machinery	Speed and registration control
Automated Production Lines	Coordinated machine movement
Special-Purpose Equipment	Closed-loop motion control

Its servo architecture is particularly useful for machinery that requires repeated acceleration, deceleration, stopping, and positioning.

Key Advantages

Precise servo performance
The MPL-B420P-HK74AA is designed for motion applications requiring controlled speed, torque, and position.

115 mm frame size
The defined frame size helps machine designers plan the mounting arrangement and available installation envelope.

Dynamic motion capability
The motor is suited to applications involving frequent acceleration, deceleration, indexing, and direction changes.

Industrial automation integration
It can be incorporated into an appropriate Allen-Bradley motion-control system with compatible servo drive and controller equipment.

Repeatable operation
Closed-loop servo control allows automated equipment to perform repeated motion profiles with consistent response.

Suitable for replacement projects
The motor can be considered for maintenance and replacement applications when its complete specifications match the existing servo system.

Technical FAQs

1. What is the Allen-Bradley MPL-B420P-HK74AA?
It is an Allen-Bradley MP-Series servo motor designed for industrial motion-control applications.

2. What is the frame size of the MPL-B420P-HK74AA?
The specified frame size is 115 mm.

3. What is the primary function of this servo motor?
It provides controlled rotary motion for automated machinery requiring accurate speed, torque, and positioning.

4. Can it be used for precision positioning?
Yes. When paired with a compatible servo drive and feedback/control system, it can be used for repeatable positioning and coordinated machine motion.

5. Why is feedback important in a servo system?
Feedback provides the control system with information about motor position and speed, allowing the drive to regulate the commanded motion.

6. Is this motor suitable for dynamic operating cycles?
Servo motors are intended for dynamic motion profiles involving acceleration, deceleration, stopping, and direction changes, subject to the applicable operating limits.

7. How should a compatible servo drive be selected?
The drive should be matched to the motor's electrical requirements, feedback configuration, control method, and mechanical load.

8. What should be checked before replacing the motor?
Confirm the complete catalog number, mounting arrangement, shaft configuration, electrical characteristics, feedback interface, cables, and compatible servo drive.

9. What can cause servo motor faults?
Incorrect wiring, feedback problems, excessive mechanical load, overheating, mechanical interference, poor tuning, and incorrect drive parameters can result in faults or unstable operation.

10. Does the motor require commissioning after installation?
Yes. The motor and drive should be configured correctly, tested, and tuned as necessary before returning the machine to normal operation.

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