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- Allen Bradley
- MPL-A320H-SJ74AA
- Servo Motor
- USA
- 100 mm
- 3.7 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Allen Bradley MPL-A320H-SJ74AA Servo Motor is a high-performance Kinetix MP-Series MPL low-inertia brushless AC servo motor designed for demanding industrial automation applications requiring exceptional positioning accuracy, rapid dynamic response, and reliable continuous-duty operation. As part of the Rockwell Automation MP-Series MPL family, this servo motor is engineered for seamless integration with Kinetix servo drives, providing precise closed-loop control of position, speed, and torque for a wide range of industrial motion systems.
The SJ74AA configuration features a single-turn high-resolution absolute encoder, a SpeedTEC right-angle 180° rotatable DIN connector, a keyed shaft extension, and an integrated 24 V DC holding brake. This configuration is particularly suitable for vertical-axis applications, indexing systems, and machinery that requires secure load holding during power loss or emergency stop conditions. The motor operates on the 230 V AC platform, features a 100 mm frame size, a 3500 rpm rated speed, and a 50.8 mm magnet stack length.
Featuring a 100 mm frame size and an approximate weight of 3.7 kg, the MPL-A320H-SJ74AA combines compact dimensions with excellent torque density. Its low-inertia rotor enables rapid acceleration and deceleration while maintaining smooth operation and highly repeatable positioning performance.
Typical applications include packaging machinery, robotics, CNC machining centers, semiconductor manufacturing equipment, electronic assembly systems, pharmaceutical production lines, material handling systems, printing machinery, and automated manufacturing cells.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen Bradley (Rockwell Automation) |
| Model | MPL-A320H-SJ74AA |
| Product Series | Kinetix MP-Series MPL |
| Product Type | AC Servo Motor |
| Motor Type | Low-Inertia Permanent Magnet Brushless Servo Motor |
| Voltage Class | 230 VAC |
| Frame Size | 100 mm |
| Rated Speed | 3500 rpm |
| Magnet Stack Length | 50.8 mm (2.0 in.) |
| Feedback Device | Single-turn High-Resolution Absolute Encoder |
| Brake | 24 V DC Holding Brake |
| Shaft Type | Keyed Shaft Extension |
| Connector Type | SpeedTEC Right-Angle 180° Rotatable DIN Connector |
| Mounting Standard | IEC Metric Flange (Type FF) |
| Cooling Method | Natural Convection |
| Weight | Approximately 3.7 kg |
Function and Working Principle
The MPL-A320H-SJ74AA converts electrical energy supplied by a compatible Kinetix servo drive into highly accurate rotary motion while continuously transmitting single-turn absolute encoder feedback for precise closed-loop control.
Typical Motion Control Architecture
Motion Controller
↓
Kinetix Servo Drive
↓
MPL-A320H-SJ74AA Servo Motor
↓
Mechanical Coupling
↓
Machine Axis
↓
Industrial Equipment
The integrated single-turn absolute encoder continuously reports shaft position to the servo drive, enabling precise regulation of position, speed, and torque. The built-in 24 V DC holding brake securely locks the motor shaft whenever drive power is removed, making the motor ideal for vertical lifting systems and gravity-loaded applications.
Primary operating functions include:
- Precision positioning
- Closed-loop speed regulation
- Dynamic torque control
- High-speed indexing
- Rapid acceleration and deceleration
- Smooth low-speed operation
- Single-turn absolute position feedback
- Electronic cam synchronization
- Coordinated multi-axis motion
- Secure load holding through the integrated brake
The low-inertia rotor minimizes settling time while improving machine productivity and positioning accuracy.
Role in Industrial Control Systems
Within industrial automation systems, the MPL-A320H-SJ74AA serves as the precision motion actuator responsible for executing positioning commands while safely retaining loads whenever machine motion is stopped.
Typical automation architecture:
ControlLogix PLC
↓
Motion Control Module
↓
Kinetix Servo Drive
↓
MPL-A320H-SJ74AA Servo Motor
↓
Precision Coupling
↓
Machine Axis
↓
Industrial Equipment
The servo motor delivers highly accurate and repeatable motion while the integrated holding brake enhances machine safety and operational reliability.
Industrial Applications
Packaging Machinery
Typical applications include:
- Cartoning machines
- Filling equipment
- Wrapping machines
- Labeling systems
- Pick-and-place equipment
Robotics
Suitable for:
- Industrial robot arms
- SCARA robots
- Delta robots
- Six-axis robotic systems
- Automated assembly cells
CNC Machinery
Frequently installed in:
- CNC machining centers
- Milling machines
- Precision lathes
- Laser cutting systems
- Grinding equipment
Semiconductor and Electronics Manufacturing
Ideal for:
- Wafer handling systems
- PCB assembly equipment
- Precision positioning systems
- Inspection machinery
- Cleanroom automation
Material Handling
Common applications include:
- Vertical lifting axes
- Conveyor positioning
- Warehouse automation
- Automated storage systems
- Sorting equipment
Pharmaceutical and Food Processing
Widely used in:
- Packaging lines
- Filling systems
- Inspection equipment
- Conveyor automation
- Precision production machinery
Installation and System Integration
Before installation, engineers should verify:
- Kinetix servo drive compatibility
- Mechanical mounting dimensions
- Shaft alignment
- Coupling selection
- Encoder cable connections
- Motor power wiring
- Brake wiring
- Protective grounding
- Mechanical load capacity
- Motion controller configuration
Recommended Installation Procedure
- Disconnect system power.
- Securely mount the servo motor.
- Align the motor shaft with the driven mechanism.
- Install the coupling or transmission assembly.
- Connect the motor power cable.
- Connect the encoder feedback cable.
- Connect the 24 V DC brake wiring.
- Verify protective grounding.
- Restore system power.
- Configure motor parameters.
- Perform motor identification.
- Test motor rotation.
- Verify holding brake operation.
- Tune servo parameters.
- Complete commissioning documentation.
Proper installation maximizes positioning accuracy, ensures reliable brake performance, and extends motor service life.
Compatible System Components
| Component | Function |
|---|---|
| Allen Bradley Kinetix Servo Drive | Servo motor control |
| ControlLogix PLC | Motion controller |
| CompactLogix PLC | Machine automation |
| MPL-A320H-SJ74AA | Precision servo motor |
| Motion Control Module | Multi-axis synchronization |
| EtherNet/IP Network | Industrial communication |
| PanelView HMI | Operator interface |
| Precision Coupling | Torque transmission |
| Ball Screw Assembly | Linear positioning |
| Industrial Power Supply | System power |
Recommended Alternative Models
| Model | Product Type | Typical Application |
|---|---|---|
| MPL-A320H-SJ74AA | AC Servo Motor | Single-turn absolute encoder with holding brake |
| MPL-A320H-SJ72AA | AC Servo Motor | Single-turn absolute encoder without brake |
| MPL-A320H-MJ74AA | AC Servo Motor | Multi-turn absolute encoder with holding brake |
| MPL-A320H-MJ72AA | AC Servo Motor | Multi-turn absolute encoder without brake |
| Kinetix VP Series | AC Servo Motor | Advanced industrial motion control |
Key Advantages
- Compact 100 mm frame size
- Low-inertia rotor for rapid dynamic response
- Rated speed of 3500 rpm
- Integrated single-turn high-resolution absolute encoder
- Built-in 24 V DC holding brake
- High positioning accuracy
- SpeedTEC quick-connect 180° rotatable connector
- Keyed shaft extension
- Seamless integration with Allen Bradley Kinetix servo drives
- Rugged industrial construction
- Suitable for continuous industrial operation
- Approximate weight 3.7 kg
Technical FAQs
What is the Allen Bradley MPL-A320H-SJ74AA?
The MPL-A320H-SJ74AA is a Kinetix MP-Series MPL low-inertia AC servo motor equipped with a single-turn high-resolution absolute encoder and an integrated 24 V DC holding brake for precision industrial motion control.
What is its primary function?
Its primary function is to provide accurate closed-loop control of position, speed, and torque while securely holding the load whenever the motor is not energized.
What is the frame size?
The motor features a 100 mm frame size.
What is the approximate weight?
The servo motor weighs approximately 3.7 kg.
Does this model include a holding brake?
Yes. The MPL-A320H-SJ74AA includes an integrated 24 V DC holding brake for secure load retention during power loss or shutdown.
Which drive systems are compatible?
It is designed for use with compatible Allen Bradley Kinetix servo drives and Logix-based motion control systems.
Which industries commonly use this servo motor?
Typical industries include packaging, robotics, semiconductor manufacturing, CNC machining, pharmaceutical production, food processing, material handling, printing, and automated assembly.
What type of feedback does the motor use?
The motor uses a single-turn high-resolution absolute encoder, providing immediate position feedback within one mechanical revolution.
Where is the servo motor typically installed?
It is commonly installed on robotic axes, vertical lifting systems, CNC machines, conveyor positioning systems, packaging equipment, semiconductor machinery, and precision manufacturing equipment.
Why is an integrated holding brake beneficial?
The integrated holding brake prevents unintended axis movement during power loss or emergency stop conditions, improving operational safety and protecting equipment on gravity-loaded or vertical applications.
Conclusion
The Allen Bradley MPL-A320H-SJ74AA Servo Motor is a compact and high-performance motion solution designed for demanding industrial automation applications. Featuring a 100 mm frame size, a low-inertia rotor, a single-turn high-resolution absolute encoder, an integrated 24 V DC holding brake, and a SpeedTEC quick-connect interface, it delivers exceptional positioning accuracy, rapid dynamic response, and dependable long-term operation.
With an approximate weight of 3.7 kg, the MPL-A320H-SJ74AA integrates easily into advanced machine designs while providing reliable precision motion control. When combined with compatible Allen Bradley Kinetix servo drives, ControlLogix PLCs, motion controllers, and EtherNet/IP communication systems, it enhances machine productivity, improves operational safety, and supports long-term industrial reliability.