Introduction

The Allen-Bradley MPL-B420P-HJ74AA Servo Motor belongs to the MP-Series family of industrial servo motors developed for automated motion-control systems. It is intended for applications where repeatable and accurately controlled movement is required.

The MPL-B420P-HJ74AA has a 115 mm frame size and a specified weight of 4.30 kg (9.48 lb). These mechanical specifications are important for machine design, motor mounting, replacement planning, and mechanical load calculations.

The motor can be used in applications such as packaging, assembly, material handling, machine tools, robotics, printing equipment, and automated production machinery. Within a complete motion system, it works together with a compatible servo drive, feedback system, and motion controller.

For replacement applications, engineers should verify the complete MPL-B420P-HJ74AA catalog number. Frame size alone is not sufficient for selecting a replacement because different servo motors can have different electrical characteristics, feedback configurations, shaft interfaces, and mounting requirements.

Technical Specifications

Specification	Details
Brand	Allen-Bradley
Product Series	MP-Series
Model	MPL-B420P-HJ74AA
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 checked against the machine's mounting arrangement and available installation space. The 4.30 kg motor weight should also be included when evaluating mechanical support requirements and moving-axis loads.

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-HJ72AA	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

Applications

The MPL-B420P-HJ74AA can be used in a variety of industrial servo applications:

Application	Typical Function
Packaging Equipment	Indexing and synchronized movement
Assembly Machinery	Precise positioning and repetitive motion
Material Handling	Controlled acceleration and positioning
Machine Tools	Servo-controlled axis movement
Robotics	Automated axis control
Printing Systems	Speed and registration control
Production Machinery	Coordinated machine movement
Special-Purpose Machines	Closed-loop motion control

The motor is well suited to applications where the machine must repeatedly accelerate, decelerate, stop, and move to defined positions.

Key Advantages

Precise motion performance
The MPL-B420P-HJ74AA is intended for servo applications requiring controlled speed, torque, and position.

115 mm frame design
The 115 mm frame size provides a compact mechanical package for industrial machines while allowing engineers to plan around a defined mounting envelope.

Dynamic response
Servo motors are designed for applications involving frequent acceleration, deceleration, indexing, and direction changes.

Industrial motion-system integration
The motor can be incorporated into a suitable Allen-Bradley automation architecture with a compatible servo drive and motion controller.

Repeatable operation
Closed-loop servo control helps machines achieve consistent motion performance over repeated operating cycles.

Suitable for maintenance and replacement
The MPL-B420P-HJ74AA can be considered for replacement projects when its electrical, mechanical, and feedback characteristics match the existing motor and drive system.

Technical FAQs

1. What is the Allen-Bradley MPL-B420P-HJ74AA?
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-HJ74AA?
The specified frame size is 115 mm.

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

4. Can the MPL-B420P-HJ74AA be used for positioning applications?
Yes. When combined with a compatible servo drive and feedback/control system, it can be used for repeatable positioning and coordinated machine movement.

5. Why is feedback important in a servo system?
Feedback allows the control system to monitor motor position and speed so that the drive can continuously regulate the commanded motion.

6. Is the motor suitable for dynamic machine cycles?
Servo motors are designed for dynamic operating profiles involving acceleration, deceleration, stopping, and direction changes, provided the application remains within the applicable ratings.

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

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

9. What are common causes of servo motor faults?
Potential causes include incorrect wiring, feedback errors, excessive mechanical load, overheating, mechanical interference, improper tuning, and incorrect drive parameters.

10. Does the motor require commissioning after installation?
Yes. The servo system should be configured correctly and tested before normal operation. Appropriate tuning may also be required to match the motor and drive to the machine load.

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