Introduction

The Allen-Bradley MPL-A210V-HJ74AA is a compact MP-Series MPL 240V AC rotary servo motor intended for industrial motion-control applications requiring controlled speed, positioning, and acceleration. Its low-inertia construction is particularly useful in machines where rapid changes in velocity are part of the operating cycle.

The model uses a 75 mm Frame 2 housing and a 25.4 mm magnet stack, giving machine builders a relatively compact servo motor option. The motor's 3500 RPM-class configuration is designed around applications where controlled dynamic performance is required without moving to a larger frame.

One of the key characteristics of the HJ74AA configuration is its 2000-line incremental encoder. Feedback from the encoder allows the associated motion controller and servo drive to monitor motor position and speed and maintain closed-loop control. Proper encoder feedback is particularly important for applications involving repeated positioning, indexing, synchronization, or coordinated axis movement.

The 24 V DC holding brake is another important feature. The brake can be used to help hold the motor shaft when the servo system is not actively producing torque. This is useful in machine axes where the load needs additional mechanical holding during shutdown or power-off conditions. Brake wiring and control should always follow the requirements of the associated drive and machine safety design.

Mechanically, the MPL-A210V-HJ74AA uses a keyed shaft extension and a right-angle SpeedTEC DIN connector arrangement. These features support integration into conventional industrial machine designs while helping simplify cable routing around the motor.

For replacement applications, engineers should not select a servo motor based only on frame size. Feedback type, brake configuration, stack length, rated performance, shaft configuration, connector arrangement, and drive compatibility should all be checked before installation. In particular, the HJ74AA should not automatically be substituted for an EJ74AA or VJ74AA simply because the motors have similar physical dimensions, because their feedback configurations differ.

Technical Specifications

Parameter	Specification
Brand	Allen-Bradley
Manufacturer	Rockwell Automation
Model	MPL-A210V-HJ74AA
Product Family	MP-Series MPL
Product Type	240V AC Rotary Servo Motor
Motor Design	Low-Inertia Brushless Servo Motor
Motor Voltage Class	230 V AC
Frame Size	75 mm
Frame Designation	Frame 2
Magnet Stack Length	25.4 mm (1.0 in.)
Maximum Speed	3500 RPM
Feedback	2000-line Incremental Encoder
Shaft Type	Keyed Shaft Extension
Brake	24 V DC Brake
Connector	SpeedTEC DIN Right-Angle Connector
Mounting	IEC Metric Mounting
Dimensions	Not specified in the supplied data
Weight	1.40 kg (3.09 lb)
Series	MP-Series MPL
Application	Industrial Servo Motion Control

Recommended Related Models

Allen-Bradley MPL-A210V-HJ72AA — 75 mm Frame 2 MPL servo motor with 2000-line incremental feedback and no brake.
Allen-Bradley MPL-A210V-EJ74AA — 75 mm Frame 2 MPL servo motor with single-turn high-resolution feedback and 24 V DC brake.
Allen-Bradley MPL-A210V-EJ72AA — 75 mm Frame 2 MPL servo motor with single-turn high-resolution feedback and no brake.
Allen-Bradley MPL-A210V-VJ74AA — 75 mm Frame 2 MPL servo motor with multi-turn high-resolution feedback and 24 V DC brake.
Allen-Bradley MPL-A210V-VJ72AA — 75 mm Frame 2 MPL servo motor with multi-turn high-resolution feedback and no brake.

Popular Related Models

Allen-Bradley MPL-A220T-HJ74AA — 75 mm Frame 2 MPL motor with a 50.8 mm stack and 2000-line incremental feedback.
Allen-Bradley MPL-A220T-EJ74AA — 75 mm Frame 2 servo motor with single-turn high-resolution feedback and brake.
Allen-Bradley MPL-A220T-VJ74AA — 75 mm Frame 2 servo motor with multi-turn high-resolution feedback and brake.
Allen-Bradley MPL-A230P-HJ74AA — 75 mm Frame 2 MPL motor with a 76.2 mm stack, 2000-line incremental feedback, and brake.
Allen-Bradley MPL-A230P-EJ74AA — 75 mm Frame 2 servo motor with single-turn high-resolution feedback and brake.
Allen-Bradley MPL-A230P-VJ74AA — 75 mm Frame 2 servo motor with multi-turn high-resolution feedback and brake.
Allen-Bradley MPL-A310P-HJ74AA — 100 mm Frame 3 MPL servo motor with 2000-line incremental feedback and brake.

Applications

The Allen-Bradley MPL-A210V-HJ74AA is an MP-Series MPL low-inertia brushless rotary servo motor designed for precision motion-control applications using Allen-Bradley servo drives. It belongs to the 230 V class MPL motor family and uses a 75 mm frame with a compact 25.4 mm magnet stack.

Typical applications include:

Packaging and filling machinery
Material handling and indexing systems
Conveyor positioning
Printing and converting equipment
Machine-tool auxiliary axes
Semiconductor and electronic assembly equipment
Pick-and-place mechanisms
Rotary positioning systems
Automated production machinery
Servo-controlled indexing and synchronized motion

The HJ74AA configuration combines the H-series incremental feedback design with a 24 V DC motor brake, making it suitable for applications where controlled stopping and holding of the mechanical load are important.

Advantages

Low-inertia servo construction: Supports fast acceleration and deceleration for demanding motion profiles.
230 V motor class: Designed for integration with compatible Allen-Bradley MP-Series servo drive systems.
75 mm frame size: Provides a compact motor solution for machines with limited installation space.
25.4 mm magnet stack: The compact stack length helps maintain a relatively small motor envelope.
2000-line incremental encoder: Provides feedback for closed-loop speed and position control.
24 V DC brake: Helps hold the motor shaft when the drive is disabled or when the machine requires mechanical holding.
Keyed shaft: Provides a conventional mechanical connection for compatible couplings, pulleys, gears, and other machine components.
SpeedTEC DIN right-angle connector: Supports practical motor cable routing within machine installations.
MP-Series compatibility: Fits into established Allen-Bradley motion-control architectures.
Suitable for retrofit applications: Its compact 75 mm frame makes it useful when replacing or servicing compatible MPL-series motors.

Technical FAQs

1. What type of motor is the MPL-A210V-HJ74AA?
It is an Allen-Bradley MP-Series MPL 240V AC rotary servo motor using a low-inertia brushless motor design.

2. What is the frame size of the MPL-A210V-HJ74AA?
The motor has a 75 mm frame size, corresponding to Frame 2 in the MPL product family.

3. What is the magnet stack length?
The MPL-A210V-HJ74AA uses a 25.4 mm (1.0 in.) magnet stack.

4. What feedback device does this servo motor use?
The H-series configuration uses a 2000-line incremental encoder for motor feedback.

5. What is the maximum motor speed?
The H-series MPL-A210V configuration is rated for approximately 3500 RPM.

6. Does the MPL-A210V-HJ74AA include a motor brake?
Yes. The HJ74AA configuration includes a 24 V DC holding brake.

7. What type of shaft does the motor have?
The motor uses a keyed shaft extension, allowing mechanical components to be securely coupled to the motor shaft.

8. What connector arrangement is used?
The motor uses a SpeedTEC DIN right-angle connector arrangement, providing a practical connection orientation for industrial machine installations.

9. Can this motor be used with an Allen-Bradley servo drive?
Yes. It is designed for use within compatible Allen-Bradley MP-Series motion-control systems. The drive, motor feedback, motor power, and brake circuits must be matched correctly during system configuration.

10. What is the weight of the MPL-A210V-HJ74AA?
The supplied product data specifies a weight of 1.40 kg (3.09 lb).

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