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Allen-Bradley MPL-B4560F-SJ74AA Servo Motor – Technical Specifications, Product Introduction, Applications, Advantages and Model Selection Guide

1. Product Overview

The Allen-Bradley MPL-B4560F-SJ74AA is a low-inertia brushless AC servo motor belonging to the MP-Series MPL Low-Inertia Servo Motor family.

It is designed for industrial motion-control applications requiring controlled acceleration, accurate positioning, repeatable motion, stable torque production, and reliable integration with servo drive systems.

The motor uses a 130 mm frame size, a 152.4 mm magnet stack, and a rated speed of 3000 rpm. Its continuous stall torque is approximately 14.1 N·m, with a peak torque capability of approximately 34.4 N·m.

The model uses a single-turn high-resolution encoder, a keyed shaft extension, and an integrated 24 V DC holding brake. It also uses a right-angle SpeedTEC DIN connector that can be rotated through 180 degrees, providing additional flexibility when the motor is installed in compact machine structures.

The combination of moderate motor inertia, relatively high torque density, high-resolution feedback, and a holding brake makes the MPL-B4560F-SJ74AA suitable for demanding industrial servo axes where both dynamic response and mechanical load control are important.

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2. Brand and Product Series

Item	Specification
Brand	Allen-Bradley
Product Family	MP-Series
Servo Motor Series	MPL Low-Inertia Servo Motors
Product Type	Brushless AC Rotary Servo Motor
Model	MPL-B4560F-SJ74AA
Voltage Class	460 V AC class
Motor Construction	Permanent-magnet brushless servo motor
Application Type	Industrial motion control
Mounting	IEC metric flange mounting
Shaft Configuration	Keyed shaft extension
Brake	24 V DC holding brake
Feedback	Single-turn high-resolution encoder

The MPL-B4560F-SJ74AA is positioned within the higher-torque section of the 130 mm-frame MPL motor range. Its 60-stack configuration gives it a longer active magnetic stack than smaller B4530F and B4540F motors, resulting in a higher torque and power capability.

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3. Detailed Technical Parameters

Parameter	MPL-B4560F-SJ74AA Specification
Model	MPL-B4560F-SJ74AA
Brand	Allen-Bradley
Series	MP-Series MPL Low-Inertia
Motor Type	Brushless AC rotary servo motor
Voltage Class	460 V AC
Rated Voltage Class	400/460 V AC class
Number of Phases	3-phase
Rated Speed	3000 rpm
Maximum Speed	3000 rpm
Continuous Stall Torque	14.1 N·m
Peak Stall Torque	34.4 N·m
Rated Output Power	3.2 kW
Rotor Inertia	0.00078 kg·m²
Frame Size	45 / 130 mm
Frame Dimension	130 mm (5.12 in.)
Magnet Stack Length	152.4 mm (6.0 in.)
Feedback Type	Single-turn high-resolution encoder
Feedback Resolution	Sin/Cos, 1024 cycles/rev class
Feedback Protocol	Hiperface-type interface
Shaft Type	Keyed shaft extension
Brake	24 V DC holding brake
Connector	SpeedTEC DIN
Connector Orientation	Right-angle
Connector Rotation	180° rotatable
Mounting Standard	IEC metric
Mounting Holes	Free mounting holes, Type FF
Duty	S1 continuous-duty class
Protection	IP66 class configuration
Operating Temperature	Approximately 0 to 40 °C
Rated Frequency Range	Up to approximately 400 Hz
Approx. Motor Weight	11.82 kg
Approx. Overall Installation Envelope	Approximately 305 × 229 × 255 mm, configuration dependent
Motor Construction	Low-inertia permanent-magnet servo
Brake Supply	24 V DC
Shaft Seal	Configuration dependent; standard version without shaft seal
Cooling	Natural/ambient cooling arrangement
Typical Drive Application	Industrial servo drive system
Typical Motion Duty	Positioning, indexing, synchronized motion, speed and torque control

Note: The 11.82 kg value is the approximate motor weight for the B4560F motor family configuration. Overall mechanical dimensions should be checked against the applicable dimensional drawing before final machine-frame design because connector orientation, brake configuration, shaft arrangement, and installation clearances can affect the required envelope.

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4. Model Number Interpretation

The model designation MPL-B4560F-SJ74AA contains configuration information describing the motor’s electrical and mechanical characteristics.

Model Section	Meaning
MPL	MPL low-inertia servo motor family
B	460 V AC class
45	Frame size 45 / approximately 130 mm
60	60-stack / 152.4 mm magnet stack
F	3000 rpm speed class
S	Single-turn high-resolution encoder
J	Keyed shaft
7	SpeedTEC DIN right-angle connector
4	24 V DC brake
AA	Standard catalog configuration designation

This configuration makes the model particularly useful when a machine requires a keyed mechanical connection, single-turn high-resolution position feedback, and a motor holding brake.

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5. Product Introduction

The MPL-B4560F-SJ74AA is a 3.2 kW class industrial servo motor designed for applications that require controlled rotary motion rather than simple fixed-speed motor operation.

Unlike a conventional induction motor, a servo motor is normally used as part of a closed-loop motion-control system. The motor, feedback device, servo drive, controller, and mechanical transmission operate together to control position, speed, acceleration, deceleration, and torque.

The B4560F motor uses a relatively low-inertia rotor design. This characteristic is important for machine axes that repeatedly accelerate and decelerate.

Lower motor inertia allows the drive system to change motor speed rapidly while maintaining controlled motion. This is especially useful in indexing machines, packaging equipment, converting machinery, assembly systems, and other automated equipment where cycle time and positioning repeatability are important.

The 14.1 N·m continuous torque rating provides substantial continuous mechanical output for a 130 mm frame motor. The approximately 34.4 N·m peak torque capability provides additional short-duration torque for acceleration, deceleration, transient load changes, and other dynamic operating conditions.

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6. Single-Turn High-Resolution Feedback

One of the major characteristics of the MPL-B4560F-SJ74AA is its single-turn high-resolution encoder.

The feedback device provides the servo drive with information about motor shaft position and rotational behavior. This information is used to close the position, velocity, and torque-control loops.

Single-turn feedback is particularly suitable for machines where the absolute position within one motor revolution is important and the overall machine control strategy does not require multi-turn absolute position storage.

The high-resolution feedback also supports accurate velocity regulation and positioning control.

For applications such as indexing, cutting, forming, assembly, electronic-component handling, and coordinated axis movement, accurate feedback is essential because even small position errors can accumulate into mechanical misalignment or process variation.

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7. Keyed Shaft Design

The MPL-B4560F-SJ74AA uses a keyed shaft extension.

A keyed shaft is useful when the mechanical transmission requires a positive torque-transfer interface between the servo motor and the driven component.

Typical connections include:

• Timing pulleys
• Couplings
• Gearboxes
• Sprockets
• Mechanical indexing mechanisms
• Ball-screw drives
• Lead-screw assemblies
• Rotary tables
• Conveyor drive mechanisms

The shaft key provides a positive mechanical interface and can be advantageous where the machine design already uses conventional keyed couplings or transmission components.

The key, coupling, shaft diameter, allowable radial load, allowable axial load, and coupling alignment should all be checked during mechanical design.

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8. Integrated 24 V DC Holding Brake

The MPL-B4560F-SJ74AA includes a 24 V DC brake.

The brake is primarily intended as a holding mechanism rather than as a substitute for a machine’s normal dynamic braking system.

When the servo axis is stopped and the brake is applied, the brake can help hold the motor shaft against movement.

This feature is particularly useful on vertical or gravity-loaded axes.

Typical applications include:

• Vertical ball-screw axes
• Z-axis positioning systems
• Lifting mechanisms
• Vertical assembly machines
• Material handling axes
• Robotic vertical axes
• Elevating mechanisms
• Machine tools with vertical slides

The brake should not automatically be treated as the primary emergency-stop braking device. Machine safety design should consider the complete motion system, including drive functions, mechanical brakes, load behavior, stopping distance, and applicable safety requirements.

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9. 3000 RPM Operating Class

The motor has a rated speed of 3000 rpm.

This speed is well suited to general industrial servo applications where a balance between torque, power, and operating speed is required.

The 3000 rpm class is commonly useful for:

• Ball-screw positioning
• Belt-driven axes
• Rotary indexing
• Packaging equipment
• Pick-and-place machinery
• Machine automation
• Material handling
• Assembly systems
• Process machinery

Compared with smaller high-speed servo motors, the B4560F places more emphasis on torque capacity and mechanical load handling.

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10. Torque Characteristics

The motor provides approximately 14.1 N·m continuous stall torque.

Its peak stall torque is approximately 34.4 N·m.

The difference between continuous and peak torque is important when selecting a servo motor.

Continuous torque represents the motor’s ability to maintain a sustained load under appropriate operating conditions.

Peak torque is relevant during short-duration acceleration, deceleration, rapid positioning, or temporary load disturbances.

For example, a machine axis may require relatively moderate torque during steady travel but significantly higher torque when accelerating a heavy load. The peak torque capability provides additional dynamic margin for these transient conditions.

Motor sizing should nevertheless be based on the actual load profile rather than simply selecting a motor according to its peak torque rating.

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11. 3.2 kW Rated Output

The MPL-B4560F-SJ74AA belongs to the approximately 3.2 kW rated output class.

This power level makes it suitable for medium-duty and relatively high-performance machine axes.

The 3.2 kW rating should be considered together with:

• Required continuous torque
• Peak acceleration torque
• Load inertia
• Reflected inertia
• Operating speed
• Duty cycle
• Acceleration time
• Deceleration time
• Gear ratio
• Mechanical transmission efficiency
• Ambient temperature
• Mounting conditions

A motor with sufficient nominal power can still be incorrectly sized if the actual load inertia or acceleration requirement is too high.

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12. Mechanical Dimensions

The motor uses a 130 mm frame size with a 152.4 mm magnet stack.

Mechanical Parameter	Approximate Value
Frame Size	130 mm
Frame Class	45
Magnet Stack	152.4 mm
Overall Motor Envelope	Approx. 305 × 229 × 255 mm
Approx. Weight	11.82 kg
Shaft	Keyed
Mounting	IEC metric
Mounting Holes	Free mounting holes, Type FF
Connector	Right-angle SpeedTEC DIN
Connector Rotation	180°

The overall envelope listed above should be regarded as an installation-planning value rather than a substitute for the exact mechanical drawing.

For machine design, sufficient clearance should be provided around the motor body, connector, cable bend radius, shaft coupling, mounting bolts, and brake/feedback connections.

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13. Connector Configuration

The motor uses a SpeedTEC DIN right-angle connector.

The connector can be rotated through 180 degrees, which provides additional flexibility when routing cables inside a machine.

This is particularly useful when the motor is installed in:

• Compact machine frames
• Enclosed automation equipment
• Multi-axis mechanisms
• Vertical structures
• Tight electrical cabinets
• High-density production lines

Cable routing should avoid excessive bending, mechanical interference, sharp edges, heat sources, and moving machine components.

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14. Main Product Advantages

14.1 High Torque Density

The motor delivers approximately 14.1 N·m continuous torque from a 130 mm frame.

This provides a useful combination of compact mechanical size and relatively high torque output.

For machine builders, this can help reduce the physical size of the motor compartment while maintaining the required axis performance.

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14.2 Low-Inertia Construction

The MPL series is designed around low-inertia servo operation.

The approximately 0.00078 kg·m² rotor inertia helps the motor respond quickly to changes in commanded speed and position.

This is particularly useful in machines with frequent acceleration and deceleration cycles.

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14.3 High-Resolution Feedback

The single-turn high-resolution encoder provides accurate shaft-position feedback to the servo drive.

This supports:

• Precise positioning
• Stable speed regulation
• Repeatable indexing
• Coordinated axis movement
• Controlled acceleration
• Controlled deceleration

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14.4 Integrated Holding Brake

The 24 V DC brake provides an additional mechanical holding function.

It is especially useful for vertical axes where gravity can cause the machine mechanism to move when motor torque is removed.

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14.5 Keyed Shaft

The keyed shaft provides a conventional mechanical connection for couplings and other power-transmission components.

This can simplify integration into machines using standard keyed mechanical components.

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14.6 Flexible Connector Orientation

The 180° rotatable right-angle connector provides more options for cable routing.

This can be valuable when multiple servo motors are installed close together or when the machine has restricted cable space.

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14.7 IEC Metric Mounting

The IEC metric mounting arrangement makes the motor suitable for machine designs using metric mounting standards.

This is useful for international industrial equipment and machines built around metric mechanical dimensions.

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14.8 3000 RPM Balanced Performance

The 3000 rpm rating provides a practical compromise between speed and torque.

The motor is therefore suitable for a broad range of machine axes without being limited to either extremely high-speed or very low-speed operation.

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15. Typical Applications

The MPL-B4560F-SJ74AA can be applied to many types of industrial automation equipment.

Packaging Machinery

Packaging machines frequently require rapid acceleration, precise indexing, synchronized movement, and repeatable stopping.

The B4560F torque and feedback characteristics are suitable for applications such as:

• Carton forming
• Filling machines
• Labeling machines
• Wrapping equipment
• Bagging systems
• Product positioning
• Conveyor synchronization

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Material Handling

The motor can be used for controlled material movement where speed and positioning must be coordinated.

Typical equipment includes:

• Conveyor axes
• Transfer mechanisms
• Lift systems
• Automated material feeders
• Pallet handling equipment
• Sorting mechanisms

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Machine Tools

The motor can be used in machine-tool auxiliary axes and positioning systems.

Potential applications include:

• Ball-screw axes
• Rotary positioning
• Tool handling
• Indexing tables
• Feed mechanisms
• Automated workpiece positioning

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Assembly Automation

Assembly machines require accurate positioning and controlled motion.

The motor can be used in:

• Press mechanisms
• Pick-and-place systems
• Screwdriving machines
• Component insertion
• Automated fixtures
• Workpiece positioning
• Transfer systems

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Printing and Converting

Servo motors are commonly used for synchronized motion in printing and converting machinery.

Potential applications include:

• Web handling
• Feed rollers
• Registration systems
• Cutting mechanisms
• Slitting systems
• Tension-controlled axes

The feedback system allows the servo controller to maintain coordinated movement between multiple machine axes.

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Semiconductor and Electronics Equipment

High-resolution feedback and controlled servo response can be useful in electronics manufacturing equipment.

Typical applications include:

• Component positioning
• Inspection mechanisms
• Wafer handling
• Precision stages
• Automated feeders
• Test equipment

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Textile Machinery

The motor can also be applied to textile machinery where controlled speed, positioning, and synchronization are required.

Possible applications include:

• Feed systems
• Roller drives
• Cutting mechanisms
• Tension-control systems
• Indexing mechanisms

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16. Applications Where the 24 V Brake Is Particularly Valuable

The integrated brake makes this motor particularly attractive for vertical-axis machinery.

Examples include:

Application	Benefit of Brake
Vertical ball screw	Helps hold the vertical axis when servo torque is removed
Lift mechanism	Helps prevent unwanted shaft movement
Z-axis machine tool	Provides holding capability during stopped conditions
Vertical assembly axis	Helps maintain position during machine pauses
Material lifting equipment	Provides additional holding function
Robotic vertical axis	Helps maintain mechanical position during controlled shutdown

The brake should always be integrated according to the machine’s control and safety strategy.

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17. Servo Drive Integration

The MPL-B4560F-SJ74AA is intended to operate as part of a complete servo motion system.

A typical system includes:

1. Motion controller
2. Servo drive
3. Servo motor
4. Feedback connection
5. Motor power cable
6. Brake wiring where applicable
7. Mechanical transmission
8. Load mechanism

The drive interprets feedback from the encoder and continuously adjusts motor current to control torque, speed, and position.

Proper drive selection is essential. The drive must be compatible with the motor’s voltage class, current requirements, feedback type, motor identification data, and control architecture.

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18. Servo Tuning Considerations

Servo tuning should be performed according to the actual mechanical load.

Important factors include:

• Load inertia
• Motor inertia
• Gear ratio
• Coupling stiffness
• Ball-screw characteristics
• Belt elasticity
• Mechanical backlash
• Friction
• Resonance
• Required acceleration
• Required positioning accuracy

A mechanically rigid axis can generally tolerate more aggressive control parameters than a flexible belt-driven mechanism.

For machines with significant mechanical compliance, overly aggressive gain settings can produce vibration, audible noise, overshoot, or instability.

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19. Thermal Considerations

Motor temperature is affected by:

• Continuous torque
• RMS current
• Duty cycle
• Ambient temperature
• Mounting arrangement
• Machine enclosure
• Heat transfer
• Operating speed
• Acceleration frequency

The motor should be installed so that heat can dissipate effectively.

A motor operating near its continuous torque limit for extended periods requires more careful thermal evaluation than a motor operating well below its continuous rating.

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20. Mechanical Installation

Correct mechanical installation is important for achieving reliable servo performance.

The motor flange should be mounted on a sufficiently rigid machine structure.

The coupling should be aligned accurately with the driven shaft.

Excessive radial or axial shaft loading should be avoided.

The machine designer should also check:

• Shaft loading
• Coupling alignment
• Mounting bolt torque
• Connector clearance
• Cable routing
• Brake operation
• Motor ventilation
• Environmental contamination
• Vibration
• Shock loading

A servo motor should not be treated as a simple drop-in replacement for another motor solely because the frame size appears similar.

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21. Why the Single-Turn Version May Be Selected

The SJ74AA configuration uses a single-turn high-resolution encoder.

This makes it different from comparable MPL motors equipped with multi-turn feedback.

Single-turn feedback can be a practical choice when:

• The machine controller manages machine position independently.
• The axis is homed during startup.
• The machine does not require stored multi-turn absolute position.
• The application primarily requires accurate position within each motor revolution.
• A standard high-resolution servo feedback configuration is sufficient.

Multi-turn versions can be more appropriate when the application requires absolute position information over multiple motor revolutions.

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22. Five Same-Series or Closely Related Models

The following models are useful comparison points when selecting an MPL motor around the same performance range.

Model	Rated Speed	Continuous Torque	Peak Torque	Rated Power	Feedback	Shaft	Brake	Frame / Stack	Approx. Weight
MPL-B4560F-SJ72AA	3000 rpm	14.1 N·m	34.4 N·m	3.2 kW	Single-turn high-resolution	Keyed	No	130 / 152.4 mm	Approx. 11.8 kg
MPL-B4560F-SJ74AA	3000 rpm	14.1 N·m	34.4 N·m	3.2 kW	Single-turn high-resolution	Keyed	24 V DC	130 / 152.4 mm	Approx. 11.82 kg
MPL-B4560F-MJ72AA	3000 rpm	14.1 N·m	34.4 N·m	3.2 kW	Multi-turn high-resolution	Keyed	No	130 / 152.4 mm	Approx. 11.8 kg class
MPL-B4560F-MJ74AA	3000 rpm	14.1 N·m	34.4 N·m	3.2 kW	Multi-turn high-resolution	Keyed	24 V DC	130 / 152.4 mm	Approx. 11.82 kg
MPL-B4560F-MK74AA	3000 rpm	14.1 N·m	34.4 N·m	3.2 kW	Multi-turn high-resolution	Keyless	24 V DC	130 / 152.4 mm	Approx. 9.1 kg class

The most important differences among these models are feedback configuration, shaft configuration, and brake availability.

For a machine that needs a brake but does not require multi-turn feedback, the MPL-B4560F-SJ74AA is a direct fit within this group.

For a machine requiring multi-turn absolute feedback, the MJ74AA configuration is the more appropriate comparison.

For applications where shaft keying is undesirable or a keyless connection is preferred, the MK74AA configuration should be considered.

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23. Five Popular Allen-Bradley Servo Motor Models for Comparison

Model	Rated Speed	Continuous Torque	Peak Torque	Rated Power	Feedback	Shaft	Brake	Frame / Stack	Approx. Weight
MPL-B430P-MJ74AA	5000 rpm	6.55 N·m	19.8 N·m	2.2 kW	Multi-turn high-resolution	Keyed	24 V DC	115 mm class / short stack	Approx. 5.5 kg
MPL-B4530F-MJ74AA	3000 rpm	8.25 N·m	20.3 N·m	2.1 kW	Multi-turn high-resolution	Keyed	24 V DC	130 / 76.2 mm	Approx. 7.3 kg
MPL-B4540F-MJ74AA	3000 rpm	10.2 N·m	27.1 N·m	2.6 kW	Multi-turn high-resolution	Keyed	24 V DC	130 / 101.6 mm	Approx. 8.6 kg
MPL-B4560F-MJ74AA	3000 rpm	14.1 N·m	34.4 N·m	3.2 kW	Multi-turn high-resolution	Keyed	24 V DC	130 / 152.4 mm	Approx. 11.82 kg
MPL-B540K-MJ74AA	4000 rpm	19.4 N·m	48.6 N·m	5.4 kW	Multi-turn high-resolution	Keyed	24 V DC	165 mm class	Approx. 15 kg class

These models cover a relatively broad range of industrial servo requirements.

The B430P is more focused on higher-speed, lower-inertia operation.

The B4530F is a smaller torque class suitable for lighter machine axes.

The B4540F provides an intermediate torque level.

The B4560F provides substantially higher continuous and peak torque while retaining the 3000 rpm operating class.

The B540K moves into a larger motor class and is more appropriate when both torque and rated power requirements are significantly higher.

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24. MPL-B4560F-SJ74AA Compared With B4530F

The B4530F is smaller in torque and power.

Parameter	MPL-B4530F-MJ74AA	MPL-B4560F-SJ74AA
Rated Speed	3000 rpm	3000 rpm
Continuous Torque	8.25 N·m	14.1 N·m
Peak Torque	20.3 N·m	34.4 N·m
Rated Power	2.1 kW	3.2 kW
Stack Length	76.2 mm	152.4 mm
Brake	24 V DC	24 V DC
Shaft	Keyed	Keyed
Feedback	Multi-turn	Single-turn
Approx. Weight	7.3 kg	11.82 kg

The B4560F-SJ74AA is therefore better suited to a heavier load or an axis requiring more acceleration torque.

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25. MPL-B4560F-SJ74AA Compared With B4540F

The B4540F sits between the B4530F and B4560F in torque capacity.

Parameter	MPL-B4540F-MJ74AA	MPL-B4560F-SJ74AA
Rated Speed	3000 rpm	3000 rpm
Continuous Torque	10.2 N·m	14.1 N·m
Peak Torque	27.1 N·m	34.4 N·m
Rated Power	2.6 kW	3.2 kW
Stack Length	101.6 mm	152.4 mm
Brake	24 V DC	24 V DC
Shaft	Keyed	Keyed
Feedback	Multi-turn	Single-turn
Approx. Weight	8.6 kg	11.82 kg

The B4560F-SJ74AA is a logical selection when the B4540F does not provide enough continuous or peak torque.

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26. MPL-B4560F-SJ74AA Compared With B540K

The B540K belongs to a larger motor class.

Parameter	MPL-B4560F-SJ74AA	MPL-B540K-MJ74AA
Rated Speed	3000 rpm	4000 rpm
Continuous Torque	14.1 N·m	19.4 N·m
Peak Torque	34.4 N·m	48.6 N·m
Rated Power	3.2 kW	5.4 kW
Frame Class	130 mm	165 mm class
Feedback	Single-turn	Multi-turn
Shaft	Keyed	Keyed
Brake	24 V DC	24 V DC
Approx. Weight	11.82 kg	Approx. 15 kg class

The B540K is intended for applications where the B4560F is no longer sufficient in terms of torque or power.

The B4560F-SJ74AA remains preferable when the machine can be adequately served by the 3.2 kW class and a more compact motor is desirable.

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27. Key Advantages for Machine Builders

For machine builders, the MPL-B4560F-SJ74AA provides several practical benefits.

Compact High-Torque Motor

The 130 mm frame combined with a 152.4 mm stack provides a relatively compact package for a motor capable of approximately 14.1 N·m continuous torque.

Strong Dynamic Performance

The low-inertia construction allows the servo axis to respond quickly to speed and position commands.

High-Resolution Feedback

The encoder supports accurate closed-loop servo control.

Integrated Brake

The 24 V DC brake provides an additional holding function for appropriate applications.

Conventional Mechanical Connection

The keyed shaft is compatible with many standard industrial transmission arrangements.

Flexible Cable Routing

The 180° rotatable right-angle connector helps accommodate different machine layouts.

Broad Industrial Application Range

The 3.2 kW, 3000 rpm class covers many general-purpose and demanding industrial servo axes.

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28. Selection Advantages of the SJ74AA Configuration

The SJ74AA configuration is particularly appropriate when the application requires all of the following characteristics:

• 460 V AC class servo motor
• 3000 rpm operating class
• 3.2 kW output class
• 14.1 N·m continuous torque
• Approximately 34.4 N·m peak torque
• Single-turn high-resolution feedback
• Keyed shaft
• 24 V DC holding brake
• 130 mm frame
• 152.4 mm stack
• IEC metric mounting
• Right-angle DIN connector

This combination makes the model more specific than a generic MPL-B4560F motor.

The feedback, shaft, brake, and connector configuration should all be checked when replacing an existing motor because a motor with the same frame and stack can still be electrically or mechanically different.

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29. Maintenance Considerations

Servo motors generally require less routine maintenance than many mechanical drive components, but installation quality has a major effect on service life.

Maintenance inspections should pay attention to:

• Motor mounting
• Shaft coupling
• Bearing condition
• Cable condition
• Connector condition
• Brake operation
• Abnormal vibration
• Abnormal temperature
• Unusual acoustic noise
• Mechanical backlash
• Encoder feedback stability

The motor should be kept free from unnecessary contamination and mechanical impact.

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30. Brake Maintenance

The holding brake should be checked periodically where the machine duty requires frequent brake operation.

The brake should engage and release correctly.

If the brake begins to produce abnormal noise, delayed release, excessive heat, or inconsistent holding performance, the machine should be inspected before continued operation.

The brake should not be repeatedly used as a high-energy dynamic stopping device unless the complete system has been specifically designed for that purpose.

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31. Cable and Connector Installation

The SpeedTEC DIN connector provides a compact connection arrangement, but proper cable installation remains important.

Servo cables should be routed away from:

• High-temperature surfaces
• Sharp mechanical edges
• High-vibration areas
• Moving mechanisms
• High-current power conductors where unnecessary
• Areas with excessive mechanical stress

Adequate bending radius should be maintained.

On moving axes, cable carrier selection and cable-flexibility requirements should be considered during machine design.

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32. Overall Product Position

The Allen-Bradley MPL-B4560F-SJ74AA can be regarded as a medium-to-high torque member of the 130 mm-frame MPL low-inertia servo family.

Its primary characteristics are:

3.2 kW output class + 3000 rpm + 14.1 N·m continuous torque + 34.4 N·m peak torque + single-turn high-resolution feedback + keyed shaft + 24 V DC brake.

This combination makes it well suited to industrial machines requiring repeatable positioning and controlled dynamic motion while also needing a mechanical holding function.

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33. Quick Specification Summary

Item	MPL-B4560F-SJ74AA
Brand	Allen-Bradley
Series	MP-Series MPL Low-Inertia
Product Type	Brushless AC rotary servo motor
Voltage	460 V AC class
Rated Speed	3000 rpm
Continuous Torque	14.1 N·m
Peak Torque	34.4 N·m
Rated Power	3.2 kW
Frame	130 mm
Stack	152.4 mm
Feedback	Single-turn high-resolution encoder
Shaft	Keyed
Brake	24 V DC
Connector	SpeedTEC DIN, right-angle
Connector Adjustment	180° rotatable
Mounting	IEC metric
Rotor Inertia	0.00078 kg·m²
Protection	IP66 class configuration
Operating Temperature	Approximately 0 to 40 °C
Approx. Dimensions	305 × 229 × 255 mm class
Approx. Weight	11.82 kg
Main Application	Industrial servo motion control

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34. Final Product Assessment

The Allen-Bradley MPL-B4560F-SJ74AA is a 3.2 kW, 3000 rpm low-inertia servo motor designed for industrial motion applications where torque, positioning performance, and controlled dynamic response are important.

Its 14.1 N·m continuous torque and approximately 34.4 N·m peak torque give it a useful operating range for medium-duty machine axes.

The single-turn high-resolution encoder provides the feedback required for closed-loop servo control, while the keyed shaft provides a conventional mechanical transmission interface.

The integrated 24 V DC holding brake is a significant advantage for vertical axes, lifting mechanisms, Z-axis systems, and other applications where the shaft must remain mechanically held when motor torque is removed.

The 130 mm frame and 152.4 mm stack provide a practical balance between motor size and torque capacity. The low-inertia design is particularly valuable for machines with frequent acceleration and deceleration.

For applications requiring a higher torque class than the B4530F or B4540F, while still remaining in the 3000 rpm 130 mm-frame range, the B4560F is a strong candidate.

When comparing it with other B4560F configurations, the main selection point is the feedback and mechanical configuration. The SJ74AA version is specifically suited to applications requiring single-turn high-resolution feedback, a keyed shaft, and a 24 V DC brake.

Before final selection, the motor should be checked against the actual load torque, RMS torque, peak acceleration torque, load inertia, operating cycle, shaft loading, environmental conditions, drive compatibility, cable requirements, and machine safety requirements.

For a correctly sized servo axis, these factors are more important than simply matching motor power. The MPL-B4560F-SJ74AA is best used where its torque, speed, feedback, brake, and mechanical configuration match the complete machine architecture.