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Allen-Bradley MPL-B310P-SJ74AA Servo Motor

1. Product Introduction

The Allen-Bradley MPL-B310P-SJ74AA is a low-inertia brushless AC rotary servo motor designed for precision motion-control applications that require fast acceleration, controlled positioning, stable speed regulation, and reliable feedback.

This motor belongs to the MPL low-inertia servo motor series and is configured for the 460/480 V AC class. It uses a 100 mm metric frame, a 25.4 mm magnet stack, a rated speed of 5000 rpm, a single-turn high-resolution absolute encoder, a keyed shaft extension, and an integrated 24 V DC holding brake.

The MPL-B310P-SJ74AA is particularly suited to machines where dynamic response is important. The low-inertia rotor construction allows the motor to respond quickly to commanded changes in speed and position, making it suitable for indexing, positioning, acceleration and deceleration, and repeated start-stop motion.

The motor is also designed with a right-angle SpeedTEC DIN connector that can be rotated through 180 degrees. This arrangement helps reduce the space required around the motor and provides greater flexibility when routing motor and feedback cables inside a machine.

A major feature of this specific model is the 24 V DC holding brake. The brake is useful for applications where the motor shaft needs to be held when servo power is removed, especially where the load may move because of gravity or an unbalanced mechanical arrangement.

The combination of low rotor inertia, 5000 rpm operating capability, high-resolution feedback, keyed shaft construction, and integrated holding brake makes the MPL-B310P-SJ74AA a practical choice for many industrial positioning systems.

2. Basic Product Parameters

Parameter	Specification
Model	MPL-B310P-SJ74AA
Brand	Allen-Bradley
Product Family	MP-Series
Product Series	MPL Low-Inertia Servo Motors
Product Type	Brushless AC Rotary Servo Motor
Voltage Class	460/480 V AC class
Frame Size	100 mm
Magnet Stack Length	25.4 mm
Rated Speed	5000 rpm
Continuous Output Torque	1.58 Nm
Peak Output Torque	3.61 Nm
Continuous Rated Power	Approximately 0.77 kW
Feedback	Absolute single-turn high-resolution encoder
Feedback Resolution	1024 Sin/Cos cycles per revolution
Feedback Protocol	Hiperface
Shaft	Keyed shaft extension
Shaft Seal	No shaft seal
Brake	24 V DC holding brake
Connector	SpeedTEC DIN connector
Connector Orientation	Right-angle, 180° rotatable
Mounting	IEC metric flange mounting
Mounting Holes	Free mounting holes, Type FF
Frame Dimension	100 mm
Stack Dimension	25.4 mm
Approximate Weight	5.44 kg
Maximum Operating Temperature	Approximately 40 °C

The main product characteristics are confirmed by the model description and technical listings for this exact catalog number. The published physical weight is approximately 5.44 kg.

3. Brand

Brand: Allen-Bradley

Allen-Bradley is the brand associated with this servo motor family and is widely used for industrial automation, motion control, machine control, and factory equipment.

For this particular product, the Allen-Bradley identification is important because the motor is not simply a generic 460 V servo motor. The encoder configuration, connector arrangement, brake configuration, motor characteristics, and intended motion-control ecosystem are all associated with the specific MPL product family.

4. Product Series

Series: MP-Series MPL Low-Inertia Servo Motor Series

The MPL series is a low-inertia brushless servo motor family intended for applications where rapid dynamic response is required.

The low-inertia design is particularly useful when the motor has to repeatedly accelerate and decelerate a relatively low-inertia machine load. A lower motor rotor inertia can reduce the amount of energy required to change motor speed and can help the motion system achieve responsive acceleration and deceleration.

The MPL-B310P-SJ74AA is part of the 460/480 V AC class of the MPL family. Its 100 mm frame and 25.4 mm magnet stack place it in the B310P size/configuration group.

5. Detailed Technical Parameters

Parameter	Detailed Specification
Model	MPL-B310P-SJ74AA
Motor Type	Low-inertia brushless AC rotary servo motor
Voltage Class	400/460/480 V AC class
Frame	Frame 3 / 100 mm
Magnet Stack	10 / 25.4 mm
Rated Speed	5000 rpm
Maximum Listed Speed	5000 rpm
Continuous Torque	1.58 Nm
Peak Torque	3.61 Nm
Continuous Power	Approximately 0.77 kW
Rotor Inertia	Approximately 5.7 × 10⁻⁵ kg·m²
Feedback	Absolute single-turn high-resolution encoder
Encoder Resolution	1024 Sin/Cos cycles/rev
Feedback Protocol	Hiperface
Shaft Configuration	Keyed
Shaft Seal	None
Brake	24 V DC holding brake
Connector	SpeedTEC DIN
Connector Style	Right angle
Connector Rotation	180° rotatable
Mounting	IEC metric flange
Mounting Hole Type	Free mounting holes, Type FF
Frame Dimensions	100 mm frame
Magnet Stack Dimension	25.4 mm
Approx. Motor Weight	5.44 kg
Operating Temperature	Up to approximately 40 °C

The 1.58 Nm continuous torque, 3.61 Nm peak torque, 0.77 kW continuous power, 5000 rpm speed, encoder configuration, and rotor inertia are listed for the exact MPL-B310P-SJ74AA configuration.

6. Model Number Explanation

The model number MPL-B310P-SJ74AA contains several configuration identifiers.

Understanding the model number is useful when selecting a replacement because two motors may have the same frame and speed but differ in encoder, shaft, or brake configuration.

Model Code Section	Meaning
MPL	Low-inertia brushless servo motor family
B	460/480 V class configuration
3	Frame size 3 / approximately 100 mm
10	Magnet stack length 10 / 25.4 mm
P	5000 rpm configuration
S	Single-turn high-resolution encoder
J	Keyed shaft
74	24 V DC brake configuration
AA	Standard catalog configuration

This configuration makes the SJ74AA version different from the otherwise similar SJ72AA, which does not have the 24 V DC brake.

7. Encoder and Feedback System

The MPL-B310P-SJ74AA uses an absolute single-turn high-resolution encoder.

The encoder provides feedback to the motion controller or servo drive so that the control system can determine motor position, speed, and direction.

The listed feedback resolution is 1024 Sin/Cos cycles per revolution, with a Hiperface feedback protocol. This is an important characteristic because the encoder is an integral part of the servo control system rather than being an optional accessory.

For precision motion applications, the feedback device allows the drive to continuously compare the commanded motor position with the actual motor position. This feedback loop is what allows a servo system to perform accurate positioning and controlled motion.

The single-turn absolute configuration is particularly useful in applications where the controller needs position information within one mechanical revolution. Exact machine behavior after power cycling will still depend on the complete drive, controller, machine setup, and homing strategy.

8. Keyed Shaft Configuration

The MPL-B310P-SJ74AA uses a keyed shaft extension.

A keyed shaft provides a mechanical interface that can be used with compatible couplings, pulleys, gears, sprockets, or other transmission components designed for a keyed shaft.

For machine builders, this is important because shaft configuration must match the mechanical transmission.

A replacement motor with the same frame size but a keyless shaft is not necessarily a direct mechanical replacement. The coupling or transmission component must be checked before substitution.

The exact shaft diameter, shaft extension length, key dimensions, and complete motor envelope should be checked against the applicable mechanical drawing before installation.

9. Integrated 24 V DC Holding Brake

One of the most important differences between the MPL-B310P-SJ74AA and the similar MPL-B310P-SJ72AA is the brake configuration.

The SJ74AA version includes a 24 V DC holding brake.

The brake is generally used to hold the motor shaft when the servo system is not actively producing holding torque.

Typical applications include vertical axes, lifting mechanisms, positioning systems, and machinery where a load could move when servo power is removed.

The brake should not automatically be treated as a substitute for a dedicated safety braking system. The machine safety design, stopping category, load characteristics, drive configuration, and applicable safety requirements must all be considered separately.

The presence of the brake also means that the electrical installation has an additional brake circuit that must be correctly connected and controlled.

10. 100 mm Frame Size

The motor uses a 100 mm frame size.

The frame size is one of the most important mechanical characteristics when replacing a servo motor because it affects mounting compatibility, shaft position, flange dimensions, and the physical envelope of the motor.

The 100 mm frame makes the MPL-B310P-SJ74AA a relatively compact industrial servo motor while still providing the performance associated with a 5000 rpm low-inertia design.

The complete motor envelope should not be estimated from the frame size alone. The 100 mm value describes the frame classification; the complete length, shaft projection, connector position, mounting dimensions, and other mechanical dimensions should be taken from the appropriate mechanical drawing.

11. 25.4 mm Magnet Stack

The MPL-B310P-SJ74AA uses a 25.4 mm magnet stack length, corresponding to the “10” portion of the B310P model designation.

The magnet stack contributes to the electromagnetic characteristics of the motor.

Within the same general frame family, increasing the magnet stack can change torque capability and motor performance. This is why motors with similar frame dimensions should not automatically be substituted for one another based only on physical size.

The 25.4 mm stack is therefore an important identification parameter when selecting a replacement.

12. 5000 RPM Speed Capability

The MPL-B310P-SJ74AA is specified at 5000 rpm.

A 5000 rpm servo motor can be useful for applications requiring rapid rotary movement, high cycle rates, and compact mechanical transmission arrangements.

High-speed operation is particularly useful in packaging, converting, indexing, assembly, and other machines where the motor must complete repeated movements within a short cycle.

However, the actual usable operating speed in a machine depends on the load, torque requirement, inertia ratio, acceleration and deceleration profile, drive configuration, mechanical transmission, temperature, and duty cycle.

13. Torque and Power Characteristics

The published continuous output torque for the MPL-B310P-SJ74AA is approximately 1.58 Nm, while the peak output torque is approximately 3.61 Nm. Continuous rated power is approximately 0.77 kW.

Continuous torque is important when determining whether the motor can maintain the required load torque over the normal operating cycle.

Peak torque is important during acceleration, deceleration, rapid positioning, or temporary load changes.

The relationship between torque and speed should always be evaluated together. A machine may require sufficient peak torque during acceleration but relatively low torque during steady-state running.

For servo sizing, the complete duty cycle should therefore be considered instead of selecting the motor only from its nominal power rating.

14. Rotor Inertia

The listed rotor inertia is approximately:

5.7 × 10⁻⁵ kg·m²

Rotor inertia is particularly important in servo applications because it influences how quickly the motor can change speed.

A low-inertia motor is generally well suited to applications involving frequent acceleration and deceleration.

Typical examples include indexing tables, pick-and-place equipment, packaging mechanisms, electronic assembly machinery, and high-speed positioning systems.

The motor inertia should also be compared with the reflected load inertia. The mechanical transmission ratio can significantly change the inertia seen by the motor shaft.

15. Dimensions and Weight

The most clearly identified dimensional parameters for the exact model are the 100 mm frame size and 25.4 mm magnet stack length.

The published reference weight for this exact model is approximately 5.44 kg.

Mechanical Parameter	Specification
Model	MPL-B310P-SJ74AA
Frame Size	100 mm
Magnet Stack Length	25.4 mm
Mounting Standard	IEC Metric
Shaft	Keyed shaft extension
Shaft Seal	No shaft seal
Connector	Right-angle SpeedTEC DIN
Connector Rotation	180°
Brake	24 V DC
Approx. Weight	5.44 kg
Complete Overall Dimensions	Refer to exact mechanical drawing
Mounting Hole Configuration	Free mounting holes, Type FF

The complete overall length should be taken from the mechanical drawing rather than calculated from the frame and stack dimensions.

16. Electrical and Connection Characteristics

The motor is configured for the 460/480 V AC class and uses a SpeedTEC DIN connector.

The right-angle connector can be rotated through 180 degrees, providing additional flexibility when the motor is installed in a machine with limited cable space.

Electrical / Connection Parameter	Specification
Model	MPL-B310P-SJ74AA
Voltage Class	460/480 V AC
Motor Type	Brushless AC rotary servo
Feedback	Absolute single-turn
Feedback Resolution	1024 Sin/Cos cycles/rev
Feedback Protocol	Hiperface
Brake Voltage	24 V DC
Brake Type	Holding brake
Motor Connector	SpeedTEC DIN
Connector Orientation	Right angle
Connector Rotation	180° rotatable
Rated Speed	5000 rpm
Continuous Torque	1.58 Nm
Peak Torque	3.61 Nm
Continuous Power	Approximately 0.77 kW
Frame Dimension	100 mm
Stack Dimension	25.4 mm
Approx. Weight	5.44 kg

17. Mechanical Characteristics

Mechanical Parameter	Specification
Model	MPL-B310P-SJ74AA
Motor Construction	Low-inertia brushless servo
Frame	100 mm
Stack	25.4 mm
Shaft Type	Keyed
Shaft Seal	None
Mounting	IEC metric flange
Mounting Hole Type	Free mounting holes / Type FF
Brake	24 V DC holding brake
Connector	Right-angle SpeedTEC DIN
Connector Rotation	180°
Rated Speed	5000 rpm
Approx. Weight	5.44 kg
Main Frame Dimension	100 mm
Magnet Stack Dimension	25.4 mm
Complete Motor Envelope	Check mechanical drawing

18. Product Applications

Packaging Machinery

The MPL-B310P-SJ74AA is suitable for packaging equipment where repeated positioning, rapid acceleration, and controlled stopping are required.

Typical functions can include indexing, film handling, product positioning, cutter movement, feeder mechanisms, and synchronized machine axes.

The 5000 rpm speed rating is useful where the mechanical system requires relatively fast rotary movement.

Assembly Equipment

The motor can be used in automated assembly machinery where a servo axis must repeatedly move between defined positions.

Examples include component insertion, positioning tables, indexing mechanisms, pick-and-place systems, and automated fastening equipment.

The high-resolution feedback system provides the control system with detailed motor position information, while the low-inertia motor construction supports fast dynamic response.

Material Handling

Servo motors are widely used in automated material-handling systems.

The MPL-B310P-SJ74AA can be considered for conveyor positioning, transfer mechanisms, indexing systems, automated handling equipment, and other applications requiring controlled motion.

For vertical material-handling axes, the integrated holding brake can be particularly relevant because it provides a means of holding the motor shaft when the servo system is not actively driving the axis.

Printing and Converting Machinery

Printing, labeling, slitting, winding, and converting equipment can require precise speed synchronization and positioning.

A servo motor with high-resolution feedback and fast dynamic response can be used for rollers, positioning axes, feeder mechanisms, tension-related motion systems, and other controlled rotary functions.

Actual suitability depends on the required continuous torque, peak torque, speed profile, load inertia, and machine duty cycle.

Machine Tools

The motor can also be applied to selected machine-tool auxiliary axes and other precision industrial machinery.

Potential applications include positioning mechanisms, indexing units, tool-handling mechanisms, automated feeders, and auxiliary rotary axes.

The actual motor selection must be based on the complete mechanical load and the required motion profile.

Inspection and Test Equipment

Automated inspection machines often require controlled movement between inspection positions.

The MPL-B310P-SJ74AA can be used for rotary positioning, indexing, actuator mechanisms, and other machine axes where repeatable movement is required.

Production Line Automation

The motor is also suitable for many general production-line motion applications.

Its combination of 5000 rpm speed, low-inertia construction, high-resolution feedback, keyed shaft, and holding brake provides a useful configuration for automated machine axes.

19. Main Product Advantages

Low-Inertia Construction

The low-inertia motor design is one of the main characteristics of the MPL series.

Low rotor inertia can help the servo system respond quickly to acceleration and deceleration commands.

This is especially useful in machines with short cycle times and frequent motion changes.

5000 RPM Operating Capability

The 5000 rpm speed rating provides a relatively high operating speed for applications requiring fast rotary movement.

High motor speed can also allow machine designers to use appropriate gearing or belt reductions to achieve the required output speed and torque.

High-Resolution Absolute Feedback

The single-turn high-resolution encoder provides detailed position feedback to the servo control system.

The listed 1024 Sin/Cos cycles per revolution and Hiperface feedback arrangement provide a defined feedback interface for the motion-control system.

Integrated 24 V DC Holding Brake

The 24 V DC holding brake is useful when the motor needs to hold its shaft after the servo drive stops actively controlling torque.

This is particularly relevant for vertical or unbalanced loads.

Keyed Shaft

The keyed shaft provides a conventional mechanical connection for compatible couplings and transmission components.

This can simplify mechanical integration when the machine is already designed around keyed shaft components.

Flexible Connector Orientation

The 180-degree rotatable right-angle connector can help reduce cable-routing problems.

This can be useful in compact machine designs where there is limited clearance around the rear of the motor.

Compact 100 mm Frame

The 100 mm frame provides a relatively compact motor package for applications requiring servo performance without using a much larger motor frame.

The actual motor length and machine envelope must still be checked against the mechanical drawing.

20. Installation Considerations

The motor should be mounted on a mechanically rigid and correctly aligned structure.

Poor alignment between the motor shaft and driven equipment can create excessive radial or axial loads, vibration, bearing stress, and premature mechanical wear.

The motor mounting flange should be properly supported, and the coupling or transmission component should be installed according to the applicable mechanical specifications.

Cable routing should provide adequate clearance around the rotating shaft and should avoid unnecessary mechanical stress on the connector.

21. Brake Installation Considerations

Because the MPL-B310P-SJ74AA includes a 24 V DC holding brake, the brake circuit should be designed correctly.

The brake is intended primarily as a holding function and should not automatically be assumed to perform every stopping or safety function required by a machine.

The control sequence should consider when the brake is released, when servo torque is established, and when the brake is applied.

For vertical axes, the machine designer should evaluate the complete load-holding arrangement, including mechanical safety requirements and the consequences of loss of electrical power.

22. Servo Tuning Considerations

Servo tuning should take into account the complete mechanical system rather than the motor alone.

Important factors include:

• Motor inertia.
• Reflected load inertia.
• Gear ratio.
• Coupling stiffness.
• Belt or screw transmission characteristics.
• Mechanical backlash.
• Required acceleration.
• Required deceleration.
• Positioning accuracy.
• Machine resonance.
• Required cycle time.
• Continuous and peak torque requirements.

Because the motor is a low-inertia design, the dynamic characteristics of the connected machine can have a significant effect on servo tuning.

A system that is mechanically flexible may require different tuning from a rigid direct-drive arrangement.

23. Maintenance Considerations

Routine maintenance should include inspection of the motor mounting, shaft connection, cable condition, connector condition, and surrounding operating environment.

The motor should be kept free from excessive contamination, moisture, and conditions outside its specified operating environment.

Special attention should be given to the shaft and coupling because excessive mechanical loading can affect bearing life.

The holding brake should also be checked as part of the machine’s maintenance program where the brake is important to machine operation.

24. Replacement and Selection Considerations

When replacing an existing MPL motor, the complete model number should be compared rather than matching only the frame size.

For example, the following characteristics can affect interchangeability:

• Voltage class.
• Frame size.
• Magnet stack.
• Rated speed.
• Feedback type.
• Shaft type.
• Brake configuration.
• Connector configuration.
• Mounting arrangement.
• Mechanical dimensions.
• Motor inertia.
• Torque requirements.

The difference between MPL-B310P-SJ72AA and MPL-B310P-SJ74AA is particularly important because the SJ74AA configuration includes a 24 V DC brake while the SJ72AA configuration does not.

25. Five Related Models in the Same Series

The following models are closely related to the MPL-B310P-SJ74AA. They use the same general B310P frame/stack family or closely related feedback and mechanical configurations.

Model	Series / Configuration	Feedback	Shaft	Brake	Speed	Frame / Stack	Approx. Weight	Dimensions
MPL-B310P-SJ72AA	MPL B310P	Single-turn high-resolution	Keyed	No brake	5000 rpm	100 mm / 25.4 mm	Approx. 5.44 kg class	100 mm frame / 25.4 mm stack
MPL-B310P-SK72AA	MPL B310P	Single-turn high-resolution	Keyless	No brake	5000 rpm	100 mm / 25.4 mm	Approx. 5.44 kg class	100 mm frame / 25.4 mm stack
MPL-B310P-SK74AA	MPL B310P	Single-turn high-resolution	Keyless	24 V DC	5000 rpm	100 mm / 25.4 mm	Approx. 5.44 kg class	100 mm frame / 25.4 mm stack
MPL-B310P-RJ72AA	MPL B310P	Resolver	Keyed	No brake	5000 rpm	100 mm / 25.4 mm	Verify exact configuration	100 mm frame / 25.4 mm stack
MPL-B310P-RK72AA	MPL B310P	Resolver	Keyless	No brake	5000 rpm	100 mm / 25.4 mm	Verify exact configuration	100 mm frame / 25.4 mm stack

The B310P family includes several configurations that retain the same basic 100 mm frame, 25.4 mm stack, and 5000 rpm arrangement while changing feedback, shaft, or brake options.

26. Comparison of the Closest B310P Models

Model	Feedback	Shaft	Brake	Frame	Stack	Speed	Weight	Dimensions
MPL-B310P-SJ74AA	Single-turn high-resolution	Keyed	24 V DC	100 mm	25.4 mm	5000 rpm	Approx. 5.44 kg	100 mm frame / 25.4 mm stack
MPL-B310P-SJ72AA	Single-turn high-resolution	Keyed	None	100 mm	25.4 mm	5000 rpm	Approx. same class	100 mm frame / 25.4 mm stack
MPL-B310P-SK74AA	Single-turn high-resolution	Keyless	24 V DC	100 mm	25.4 mm	5000 rpm	Approx. same class	100 mm frame / 25.4 mm stack
MPL-B310P-SK72AA	Single-turn high-resolution	Keyless	None	100 mm	25.4 mm	5000 rpm	Approx. same class	100 mm frame / 25.4 mm stack
MPL-B310P-RJ72AA	Resolver	Keyed	None	100 mm	25.4 mm	5000 rpm	Verify exact configuration	100 mm frame / 25.4 mm stack

For direct replacement work, the feedback and brake configuration should be treated as critical selection parameters rather than optional details.

27. Five Commonly Referenced Models from the Same Brand

The following models are additional examples from the same general servo-motor product family and are useful for comparison when selecting an industrial servo motor.

Model	Product Family	General Configuration	Feedback / Option	Speed	Frame / Stack	Weight	Dimensions
MPL-B210V-VJ72AA	MP-Series MPL	Low-inertia servo	V-series feedback configuration	Model dependent	B210V frame / stack configuration	Verify exact model	Frame and stack per drawing
MPL-B220T-VJ72AA	MP-Series MPL	Low-inertia servo	V-series feedback configuration	Model dependent	B220T frame / stack configuration	Verify exact model	Frame and stack per drawing
MPL-B230P-VJ72AA	MP-Series MPL	Low-inertia servo	V-series feedback configuration	5000 rpm class	B230P frame / stack configuration	Verify exact model	Frame and stack per drawing
MPL-B320P-SJ72AA	MP-Series MPL	Low-inertia servo	Single-turn high-resolution	5000 rpm	100 mm / 50.8 mm	Verify exact model	100 mm frame / 50.8 mm stack
MPL-B330P-MJ72AA	MP-Series MPL	Low-inertia servo	Multi-turn high-resolution	5000 rpm class	B330P frame / stack configuration	Verify exact model	Frame and stack per drawing

The B320P configuration is especially relevant when more magnetic stack length is required while retaining the same general 100 mm frame and 5000 rpm family. Catalog listings also show B310P and B320P configurations with different encoder and brake options.

28. B310P and B320P Family Comparison

Model	Frame	Magnet Stack	Speed	Feedback	Shaft	Brake	Weight	Dimensions
MPL-B310P-SJ74AA	100 mm	25.4 mm	5000 rpm	Single-turn high-resolution	Keyed	24 V DC	Approx. 5.44 kg	100 mm / 25.4 mm
MPL-B310P-SJ72AA	100 mm	25.4 mm	5000 rpm	Single-turn high-resolution	Keyed	None	Approx. same class	100 mm / 25.4 mm
MPL-B320P-SJ72AA	100 mm	50.8 mm	5000 rpm	Single-turn high-resolution	Keyed	None	Verify exact model	100 mm / 50.8 mm
MPL-B320P-SJ74AA	100 mm	50.8 mm	5000 rpm	Single-turn high-resolution	Keyed	24 V DC	Verify exact model	100 mm / 50.8 mm

The B310P and B320P configurations demonstrate why the magnet stack designation is important. Both can use the 100 mm frame, while the stack length changes the motor configuration and performance characteristics.

29. Practical Advantages for Machine Builders

From a machine-building perspective, the MPL-B310P-SJ74AA provides several useful characteristics in one package.

First, the low-inertia construction supports fast motion changes.

Second, the 5000 rpm operating specification provides a relatively high-speed motor platform.

Third, the absolute single-turn encoder provides integrated high-resolution feedback.

Fourth, the keyed shaft simplifies compatibility with suitable mechanical transmission components.

Fifth, the 24 V DC brake adds a holding function that can be valuable for vertical and gravity-loaded axes.

Sixth, the rotatable right-angle connector gives the machine designer additional flexibility when routing cables.

These features make the motor suitable for many automated machine axes where speed, repeatability, controlled positioning, and mechanical integration are important.

30. Product Selection Checklist

Before purchasing or replacing the MPL-B310P-SJ74AA, the following points should be checked:

Selection Item	MPL-B310P-SJ74AA
Model	MPL-B310P-SJ74AA
Voltage	460/480 V AC class
Frame	100 mm
Stack	25.4 mm
Speed	5000 rpm
Continuous Torque	1.58 Nm
Peak Torque	3.61 Nm
Power	Approximately 0.77 kW
Feedback	Absolute single-turn high-resolution
Feedback Protocol	Hiperface
Feedback Resolution	1024 Sin/Cos cycles/rev
Shaft	Keyed
Brake	24 V DC
Connector	SpeedTEC DIN
Mounting	IEC metric
Approx. Weight	5.44 kg
Frame Dimension	100 mm
Stack Dimension	25.4 mm
Complete Dimensions	Verify exact mechanical drawing

This checklist is useful when comparing an existing motor with a replacement motor because it prevents selection based only on the visible model number or frame size.

31. Overall Product Advantages Summary

The MPL-B310P-SJ74AA combines a compact 100 mm frame with a 25.4 mm magnet stack and 5000 rpm operating specification.

Its low-inertia design makes it appropriate for motion systems with frequent acceleration and deceleration.

The 1.58 Nm continuous torque and approximately 3.61 Nm peak torque provide a useful operating range for compact industrial servo applications.

The absolute single-turn high-resolution encoder gives the servo system position feedback through the Hiperface interface.

The keyed shaft provides a familiar mechanical connection for compatible transmission components.

The integrated 24 V DC holding brake provides an additional mechanical holding function, which can be useful on vertical and gravity-loaded axes.

The right-angle SpeedTEC DIN connector, with 180-degree rotation, provides additional flexibility for machine installation and cable routing.

The overall configuration is therefore well suited to automated equipment where compact dimensions, high rotational speed, controlled positioning, and dynamic response are required.

32. Final Technical Summary

Parameter	Final Specification
Model	MPL-B310P-SJ74AA
Brand	Allen-Bradley
Series	MPL Low-Inertia Servo Motor
Product Family	MP-Series
Motor Type	Brushless AC Rotary Servo Motor
Voltage Class	460/480 V AC
Frame Size	100 mm
Magnet Stack	25.4 mm
Rated Speed	5000 rpm
Continuous Torque	1.58 Nm
Peak Torque	3.61 Nm
Continuous Power	Approximately 0.77 kW
Rotor Inertia	Approximately 5.7 × 10⁻⁵ kg·m²
Feedback	Absolute single-turn high-resolution encoder
Feedback Resolution	1024 Sin/Cos cycles/rev
Feedback Protocol	Hiperface
Shaft	Keyed shaft extension
Shaft Seal	No shaft seal
Brake	24 V DC holding brake
Connector	SpeedTEC DIN
Connector Type	Right-angle
Connector Rotation	180°
Mounting	IEC metric
Mounting Holes	Free mounting holes / Type FF
Frame Dimension	100 mm
Stack Dimension	25.4 mm
Approx. Weight	5.44 kg
Operating Temperature	Up to approximately 40 °C
Main Application	Industrial precision motion control
Typical Machine Types	Packaging, assembly, indexing, material handling, printing, converting, inspection, production machinery

33. Final Product Description

The Allen-Bradley MPL-B310P-SJ74AA is a 5000 rpm low-inertia brushless AC servo motor designed for demanding industrial motion-control applications.

It features a 100 mm frame, 25.4 mm magnet stack, approximately 1.58 Nm continuous torque, approximately 3.61 Nm peak torque, and approximately 0.77 kW continuous power capability.

Its absolute single-turn high-resolution encoder provides feedback through a Hiperface interface, while the keyed shaft provides a conventional mechanical connection for compatible machine components.

The integrated 24 V DC holding brake is an important feature for applications where the motor shaft needs to remain mechanically held when active servo torque is removed.

The right-angle SpeedTEC DIN connector can be rotated through 180 degrees, helping machine builders manage cable routing in compact equipment.

With its low-inertia construction, high-speed capability, high-resolution feedback, keyed shaft, and integrated brake, the MPL-B310P-SJ74AA is a configuration intended for automated industrial machinery requiring controlled and repeatable rotary motion.

For replacement work, the complete model number should always be matched carefully. In particular, the encoder type, shaft configuration, brake option, frame size, magnet stack, voltage class, and mechanical dimensions should all be checked before treating another motor as a direct replacement.

The published approximate weight for this exact configuration is 5.44 kg, while the principal dimensional identifiers are the 100 mm frame and 25.4 mm magnet stack. The complete motor length, shaft projection, flange details, and connector envelope should be confirmed from the mechanical drawing for the actual installation.

Overall, the MPL-B310P-SJ74AA is a compact, high-speed, low-inertia servo motor configuration intended for precision industrial motion systems where fast response, feedback accuracy, controlled positioning, and shaft holding capability are important.