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Allen-Bradley MPL-B4560F-SK74AA Servo Motor – Technical Specifications, Applications, Advantages and Model Selection Guide

1. Product Overview

The Allen-Bradley MPL-B4560F-SK74AA is a low-inertia brushless AC servo motor in the MP-Series MPL Low-Inertia Servo Motor family.

The motor is designed for industrial motion-control applications requiring controlled speed, accurate positioning, rapid acceleration and deceleration, repeatable indexing, and coordinated machine movement.

The MPL-B4560F-SK74AA uses a 460 V AC class, 130 mm frame, and 152.4 mm magnet stack. It operates in the 3000 rpm speed class and provides approximately 14.1 N·m continuous stall torque with approximately 34.4 N·m peak stall torque.

A major feature of this particular configuration is the combination of a single-turn high-resolution encoder, keyless shaft extension, and 24 V DC holding brake.

This configuration is therefore different from both keyed-shaft and no-brake versions of the B4560F family.

The keyless shaft is well suited to clamp-type or friction-locking couplings, while the integrated 24 V DC brake is useful for applications where the motor shaft needs to be mechanically held after the servo system is stopped.

The motor uses a SpeedTEC DIN right-angle connector with approximately 180° rotational flexibility, allowing greater freedom when routing motor and feedback cables inside compact machine structures.

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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-SK74AA
Voltage Class	460 V AC
Motor Construction	Permanent-magnet brushless servo
Frame Size	130 mm
Frame Designation	45
Magnet Stack	152.4 mm
Stack Designation	60
Rated Speed	3000 rpm
Feedback	Single-turn high-resolution encoder
Shaft	Keyless shaft extension
Brake	24 V DC holding brake
Connector	SpeedTEC DIN
Connector Style	Right-angle
Connector Rotation	180° rotatable
Mounting Standard	IEC metric
Mounting Holes	Free mounting holes, Type FF
Primary Application	Industrial closed-loop motion control

The MPL-B4560F-SK74AA is part of the B4560F group of MPL motors.

Within this group, the basic motor size and performance are similar, while the suffix configuration determines important differences such as encoder type, shaft arrangement, and brake availability.

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3. Detailed Technical Parameters

Parameter	MPL-B4560F-SK74AA Specification
Model	MPL-B4560F-SK74AA
Brand	Allen-Bradley
Series	MP-Series MPL Low-Inertia
Product Type	Brushless AC rotary servo motor
Voltage Class	460 V AC
Rated Voltage Class	400/460 V AC class
Rated Speed	3000 rpm
Speed Class	3000 rpm
Continuous Stall Torque	14.1 N·m
Peak Stall Torque	34.4 N·m
Rated Output Power	Approximately 3.2 kW
Rotor Inertia	Approximately 0.00078 kg·m²
Frame Size	130 mm
Frame Designation	45
Magnet Stack Length	152.4 mm
Stack Designation	60
Feedback Type	Single-turn high-resolution encoder
Feedback Configuration	Absolute single-turn
Feedback Resolution	1024 Sin/Cos cycles/rev class
Feedback Interface	Hiperface-type
Shaft Configuration	Keyless shaft extension
Shaft Key	None
Integral Brake	Yes
Brake Voltage	24 V DC
Brake Type	Holding brake
Connector	SpeedTEC DIN
Connector Type	Right-angle
Connector Rotation	180° rotatable
Mounting	IEC metric
Mounting Holes	Free mounting holes, Type FF
Motor Design	Low-inertia permanent-magnet servo
Duty	Continuous-duty industrial servo application
Approx. Weight	9.07 kg
Approx. Mechanical Envelope	Approximately 305 × 229 × 255 mm class
Approx. Frame Dimension	130 mm
Approx. Stack Dimension	152.4 mm
Typical Application	Position, velocity and torque-controlled motion

The 9.07 kg weight is an approximate reference value for this configuration.

The overall dimensions listed above are intended as an installation-planning reference. Exact shaft dimensions, flange geometry, mounting-hole dimensions, connector clearance, and cable-routing space should be confirmed against the applicable mechanical drawing before final machine fabrication.

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4. Model Number Interpretation

The designation MPL-B4560F-SK74AA identifies the motor family and configuration.

Model Section	General 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
K	Keyless shaft extension
7	SpeedTEC DIN right-angle connector
4	24 V DC holding brake
AA	Standard catalog configuration designation

The SK74AA configuration is particularly notable because it combines three important features:

Single-turn high-resolution feedback + keyless shaft + 24 V DC holding brake.

This makes it suitable for servo axes that require accurate single-turn position feedback, a keyless mechanical transmission connection, and motor-mounted shaft holding capability.

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5. Product Introduction

The MPL-B4560F-SK74AA is a permanent-magnet brushless servo motor intended for use with an industrial servo drive and motion-control system.

The motor itself provides the mechanical output, while the servo drive controls the motor’s current, speed, torque, and position.

The encoder provides continuous feedback to the control system.

This closed-loop arrangement allows the machine controller to command precise motion rather than simply turning the motor on or off.

The motor can therefore be used for applications requiring:

• Accurate positioning
• Controlled acceleration
• Controlled deceleration
• Speed regulation
• Electronic gearing
• Electronic camming
• Coordinated multi-axis motion
• Repetitive indexing
• Torque control

The B4560F size provides a relatively high torque capability while maintaining a 130 mm frame class.

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6. Low-Inertia Servo Motor Design

The MPL family is designed around low-inertia servo motor technology.

The approximate rotor inertia of the B4560F configuration is 0.00078 kg·m².

Low rotor inertia reduces the torque required to accelerate the motor itself.

This allows more of the available motor torque to be used for accelerating the external machine load.

The result can be a faster machine response, particularly in applications with frequent speed changes.

Typical low-inertia applications include:

• High-cycle packaging machinery
• Indexing systems
• Pick-and-place machines
• Automated assembly equipment
• Feed mechanisms
• Material-handling equipment
• Cutting machinery
• Electronic component positioning
• Printing and converting systems

The motor’s low inertia should always be evaluated together with the actual load inertia.

A very large external load can still require significant acceleration torque even when the motor rotor itself has low inertia.

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7. Continuous Torque Performance

The MPL-B4560F-SK74AA provides approximately 14.1 N·m continuous stall torque.

Continuous torque is important when evaluating whether the motor can maintain the required load throughout the normal machine operating cycle.

For example, a servo-driven ball screw may require continuous torque to maintain linear force against a workpiece.

A conveyor or roller system may require continuous torque to overcome friction and product load.

The actual motor selection should be based on the complete RMS torque profile rather than simply comparing one continuous torque number.

An adequate torque margin is normally desirable because machine friction, mechanical wear, temperature, and load variation can change the actual operating requirement.

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8. Peak Torque Capability

The motor provides approximately 34.4 N·m peak stall torque.

Peak torque is used during short-duration dynamic events.

Examples include:

• Rapid acceleration
• Rapid deceleration
• Direction reversal
• High-inertia load startup
• Short positioning movements
• Temporary load increases
• Fast indexing

The difference between continuous torque and peak torque allows the motor to provide significantly more torque for short periods than it can continuously.

Peak torque should not be treated as a continuous operating value.

The actual duty cycle should be evaluated to ensure that the motor remains within its thermal capability.

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9. Rated Output Power

The motor belongs to the approximately 3.2 kW output class.

This places the B4560F above the smaller B4530F and B4540F configurations in terms of torque and power.

The 3.2 kW rating is suitable for many medium-duty industrial servo axes.

Typical applications include:

• Machine positioning
• Conveyor control
• Packaging axes
• Ball-screw mechanisms
• Rotary indexing
• Automated assembly
• Material handling
• Feed systems
• Cutting mechanisms

The actual application should be evaluated according to torque and speed requirements rather than using rated power alone.

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10. Single-Turn High-Resolution Encoder

The MPL-B4560F-SK74AA uses a single-turn high-resolution encoder.

The encoder provides shaft-position feedback to the servo drive.

This feedback is used by the drive to regulate the motor’s:

• Position
• Speed
• Torque
• Direction
• Acceleration
• Deceleration

High-resolution feedback is important when a machine requires repeatable positioning.

The single-turn configuration provides precise position information within one motor revolution.

It is suitable for applications where the machine control architecture does not require multi-turn absolute position information.

For applications that require absolute position tracking across multiple motor revolutions, a multi-turn MPL configuration may be more appropriate.

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11. Keyless Shaft Extension

One of the main mechanical characteristics of the SK74AA model is its keyless shaft extension.

A keyless shaft is commonly used with clamp-type couplings, friction-locking hubs, and other precision mechanical transmission components.

This arrangement eliminates the need for a traditional shaft key and keyway.

Potential advantages include:

• Simplified coupling installation
• Flexible coupling positioning
• No keyway alignment requirement
• Clean mechanical interface
• Compatibility with clamp-style servo couplings
• Useful installation flexibility

The coupling must still be correctly sized for the motor shaft.

The machine designer should consider:

• Coupling torque rating
• Shaft diameter
• Radial load
• Axial load
• Operating speed
• Shaft alignment
• Coupling stiffness
• Coupling balance

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12. Integrated 24 V DC Holding Brake

The MPL-B4560F-SK74AA includes a 24 V DC holding brake.

The brake is primarily intended to hold the motor shaft when the servo system is stopped or when motor torque is removed under appropriate operating conditions.

This feature is especially useful for:

• Vertical axes
• Z-axis mechanisms
• Lifting systems
• Gravity-loaded ball screws
• Vertical assembly machines
• Material-handling lifts
• Elevating platforms
• Vertical positioning mechanisms

The brake provides a mechanical holding function, but it should not automatically be treated as the primary high-energy emergency stopping mechanism.

Machine safety should consider the complete system, including servo drive functions, external safety devices, load characteristics, stopping distance, mechanical brakes, and applicable safety requirements.

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13. Advantages of the Integrated Brake

The 24 V DC brake provides several practical benefits.

Holding During Power-Off Conditions

The brake can help prevent unwanted shaft movement when servo torque is no longer available.

Vertical-Axis Support

It is particularly useful where gravity can cause a vertical load to move.

Reduced External Hardware

A motor-mounted brake can reduce the need for a separate external motor-side holding brake.

Machine Position Retention

The brake can help maintain the axis position during machine stops and controlled shutdown sequences.

Compact Integration

Because the brake is integrated into the motor configuration, it does not require a separate external motor-brake assembly.

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14. SpeedTEC DIN Connector

The motor uses a SpeedTEC DIN right-angle connector.

The connector is approximately 180° rotatable.

This is particularly useful for machine builders working with limited installation space.

The connector can be oriented to help avoid interference with:

• Machine frames
• Covers
• Adjacent servo motors
• Linear guides
• Cable carriers
• Gearboxes
• Mechanical structures

Proper cable bend radius should be maintained at all times.

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15. Mechanical Dimensions

The B4560F uses a 130 mm frame and 152.4 mm magnet stack.

Mechanical Parameter	Approximate Value
Frame Size	130 mm
Frame Designation	45
Magnet Stack Length	152.4 mm
Stack Designation	60
Approx. Overall Envelope	305 × 229 × 255 mm class
Approx. Weight	9.07 kg
Shaft Type	Keyless
Shaft Key	None
Mounting	IEC metric
Mounting Holes	Type FF
Connector	SpeedTEC DIN, right-angle
Connector Rotation	180°

The mechanical envelope should not be used as a replacement for the exact dimensional drawing.

Additional clearance should be provided for the brake wiring, feedback cable, motor power cable, coupling, shaft access, and connector bend radius.

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16. Electrical Characteristics

Electrical Parameter	MPL-B4560F-SK74AA
Voltage Class	460 V AC
Supply	3-phase AC servo drive
Rated Output	Approx. 3.2 kW
Rated Speed	3000 rpm
Continuous Torque	14.1 N·m
Peak Torque	34.4 N·m
Rotor Inertia	Approx. 0.00078 kg·m²
Feedback	Single-turn high-resolution
Brake	24 V DC
Motor Type	Permanent-magnet brushless servo
Frame	130 mm
Stack	152.4 mm

The servo drive controls the current delivered to the motor.

Drive selection should take into account voltage class, current requirements, feedback compatibility, peak torque requirements, motor identification data, and application duty cycle.

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17. Main Product Advantages

17.1 High Torque Density

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

This provides a useful torque-to-size ratio for industrial machine design.

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17.2 Low Rotor Inertia

The low-inertia rotor helps the motor respond rapidly to command changes.

This is useful for high-cycle machinery where the motor repeatedly accelerates, decelerates, and reverses.

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17.3 High-Resolution Feedback

The single-turn high-resolution encoder provides precise feedback for closed-loop servo control.

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17.4 Keyless Shaft

The keyless shaft provides a clean interface for suitable clamp-type couplings.

It is particularly useful where the machine designer prefers a friction-locking connection rather than a keyed connection.

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17.5 Integrated 24 V DC Brake

The integrated brake provides a holding function without requiring a separate motor-side brake assembly.

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17.6 Compact 130 mm Frame

The 130 mm frame allows the motor to provide relatively high torque without immediately moving into a larger frame size.

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17.7 3000 rpm Speed Class

The 3000 rpm rating is appropriate for a broad range of industrial positioning and rotary-motion applications.

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17.8 Flexible Connector Arrangement

The rotatable right-angle connector simplifies cable routing in compact machine structures.

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18. Typical Applications

Packaging Machinery

Packaging machines frequently require rapid and repetitive servo movement.

The MPL-B4560F-SK74AA can be used for:

• Product indexing
• Conveyor synchronization
• Film feeding
• Cutting
• Sealing
• Carton positioning
• Product transfer
• Rotary indexing

The low-inertia design is particularly useful where short machine cycles require frequent acceleration and deceleration.

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19. Material Handling Systems

Material-handling machinery often requires controlled speed and repeatable positioning.

Possible applications include:

• Conveyor axes
• Transfer mechanisms
• Product feeders
• Sorting systems
• Lifting mechanisms
• Automated material positioning
• Roller drives

The integrated brake is particularly useful when the motor is applied to a vertical or gravity-loaded mechanism.

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20. Machine Tool Applications

The motor can be used for machine-tool positioning and auxiliary motion systems.

Potential applications include:

• Ball-screw axes
• Feed mechanisms
• Indexing systems
• Rotary positioning
• Tool handling
• Workpiece positioning

The integrated brake can be useful on vertical axes, although the complete safety and load-holding system must still be evaluated.

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21. Assembly Automation

The motor can be applied to automated assembly machinery requiring accurate and repeatable motion.

Typical examples include:

• Component insertion
• Automated fixtures
• Pick-and-place systems
• Workpiece positioning
• Assembly transfer
• Feeding mechanisms
• Automated fastening
• Press positioning

The high-resolution encoder supports accurate control of repeated machine movements.

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22. Printing and Converting Equipment

The motor is suitable for servo-controlled axes in printing and converting machinery.

Potential applications include:

• Web feeding
• Registration control
• Cutting
• Slitting
• Roller synchronization
• Indexing
• Material feeding

The servo system can synchronize the motor with other machine axes to maintain consistent product movement.

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23. Electronics Manufacturing

The motor can also be considered for automated electronics production equipment.

Typical applications include:

• Component positioning
• Inspection mechanisms
• Precision transfer
• Automated assembly
• Test equipment
• Small-part handling
• Feeder mechanisms

The single-turn high-resolution feedback is useful where precise motor position is important but multi-turn absolute position is not required.

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24. Textile Machinery

Potential textile applications include:

• Feed rollers
• Material feeding
• Cutting mechanisms
• Tension-control axes
• Roller synchronization
• Indexing mechanisms

The 3000 rpm speed class provides a useful balance between speed and torque for many textile machine applications.

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25. Vertical Axis Applications

The SK74AA configuration is particularly interesting for vertical applications because it combines the B4560F torque capacity with an integrated brake.

Possible vertical applications include:

Application	Main Benefit
Vertical ball screw	Holding support when servo torque is removed
Z-axis	Helps maintain axis position
Lift mechanism	Reduces unwanted shaft movement
Vertical assembly	Helps hold the working position
Material lift	Provides motor-mounted holding function
Elevating mechanism	Helps maintain load position
Vertical indexing	Supports controlled stopping and holding

The brake must be correctly integrated into the machine control and safety system.

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26. Servo Drive Integration

The motor is intended to operate as part of a complete servo motion-control system.

A typical system consists of:

1. Motion controller
2. Servo drive
3. Servo motor
4. Feedback cable
5. Motor power cable
6. Brake wiring
7. Mechanical coupling
8. Machine load

The motion controller generates the required motion command.

The servo drive converts this command into controlled motor current.

The encoder sends motor position information back to the drive.

The drive continuously adjusts motor current to maintain the commanded position, speed, and torque.

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27. Servo Tuning Considerations

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

Important factors include:

• Motor inertia
• Load inertia
• Gear ratio
• Coupling stiffness
• Belt elasticity
• Ball-screw stiffness
• Mechanical resonance
• Backlash
• Friction
• Required acceleration
• Required deceleration

A low-inertia motor can respond quickly, but the mechanical structure must be sufficiently rigid.

If the mechanical structure is flexible, excessively aggressive tuning may produce:

• Vibration
• Overshoot
• Noise
• Position instability
• Mechanical resonance

The final servo gains should therefore be established from the actual machine response.

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28. Load Inertia and Motor Sizing

Motor sizing should be based on the complete load profile.

Important calculations include:

• Continuous torque
• RMS torque
• Peak torque
• Motor inertia
• Reflected load inertia
• Acceleration torque
• Deceleration torque
• Operating speed
• Cycle time
• Gear ratio
• Mechanical efficiency

A motor with adequate rated power may still be incorrectly sized if the machine has excessive reflected inertia.

The B4560F low-inertia rotor is advantageous for dynamic applications, but the external load still determines a large part of the actual acceleration requirement.

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29. Thermal Considerations

Motor temperature depends on:

• Continuous torque
• RMS current
• Peak current
• Duty cycle
• Ambient temperature
• Mounting structure
• Machine enclosure
• Operating speed
• Acceleration frequency
• Cooling conditions

A machine axis that operates close to the motor’s continuous torque limit for long periods requires careful thermal evaluation.

The motor mounting structure should allow suitable heat transfer.

Machine enclosures should also be evaluated because a high ambient temperature can reduce available thermal margin.

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30. Keyless Shaft Advantages

The keyless shaft configuration is especially useful for modern servo coupling systems.

Feature	Keyless Shaft
Shaft Key	Not required
Keyway	Not required
Coupling Type	Clamp/friction-locking preferred
Installation	Coupling can be positioned without keyway alignment
Mechanical Interface	Clean cylindrical shaft
Typical Use	Servo couplings and precision transmission
Model	MPL-B4560F-SK74AA

A suitable coupling must be selected according to the motor shaft dimensions, torque, speed, and allowable shaft loads.

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31. Comparison With Keyed B4560F Configuration

Parameter	MPL-B4560F-SK74AA	MPL-B4560F-SJ74AA
Rated Speed	3000 rpm	3000 rpm
Continuous Torque	14.1 N·m	14.1 N·m
Peak Torque	34.4 N·m	34.4 N·m
Rated Power	Approx. 3.2 kW	Approx. 3.2 kW
Feedback	Single-turn high-resolution	Single-turn high-resolution
Shaft	Keyless	Keyed
Brake	24 V DC	24 V DC
Frame	130 mm	130 mm
Stack	152.4 mm	152.4 mm
Approx. Weight	9.07 kg	Approx. 11.82 kg
Primary Difference	Keyless mechanical interface	Keyed mechanical interface

The electrical performance is broadly similar between these configurations.

The primary selection factor is the mechanical shaft connection.

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32. Comparison With No-Brake B4560F Configuration

Parameter	MPL-B4560F-SK74AA	MPL-B4560F-SK72AA
Rated Speed	3000 rpm	3000 rpm
Continuous Torque	14.1 N·m	14.1 N·m
Peak Torque	34.4 N·m	34.4 N·m
Rated Power	Approx. 3.2 kW	Approx. 3.2 kW
Feedback	Single-turn high-resolution	Single-turn high-resolution
Shaft	Keyless	Keyless
Brake	24 V DC	None
Frame	130 mm	130 mm
Stack	152.4 mm	152.4 mm
Approx. Weight	9.07 kg	Approx. 6.80 kg
Main Difference	Brake-equipped	No integral brake

The SK74AA should be selected when the machine requires a motor-mounted holding brake.

The SK72AA is more appropriate when the brake is unnecessary or when the machine uses another external holding arrangement.

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33. Five Same-Series or Closely Related Models

The following models are useful alternatives for comparing the B4560F family and closely related MPL configurations.

Model	Rated Speed	Continuous Torque	Peak Torque	Rated Power	Feedback	Shaft	Brake	Dimensions / Frame	Approx. Weight
MPL-B4560F-SK72AA	3000 rpm	14.1 N·m	34.4 N·m	Approx. 3.2 kW	Single-turn high-resolution	Keyless	No	130 mm / 152.4 mm stack	Approx. 6.80 kg
MPL-B4560F-SJ72AA	3000 rpm	14.1 N·m	34.4 N·m	Approx. 3.2 kW	Single-turn high-resolution	Keyed	No	130 mm / 152.4 mm stack	Approx. 11.82 kg class
MPL-B4560F-SJ74AA	3000 rpm	14.1 N·m	34.4 N·m	Approx. 3.2 kW	Single-turn high-resolution	Keyed	24 V DC	130 mm / 152.4 mm stack	Approx. 11.82 kg
MPL-B4560F-MK74AA	3000 rpm	14.1 N·m	34.4 N·m	Approx. 3.2 kW	Multi-turn high-resolution	Keyless	24 V DC	130 mm / 152.4 mm stack	Approx. 9.07 kg class
MPL-B4540F-SK72AA	3000 rpm	10.2 N·m	27.1 N·m	Approx. 2.6 kW	Single-turn high-resolution	Keyless	No	130 mm / 101.6 mm stack	Approx. 6–9 kg class

The MPL-B4560F-SK72AA is the closest comparison when the same keyless shaft and single-turn encoder are required without a brake.

The MPL-B4560F-SJ74AA provides a keyed shaft while retaining the single-turn feedback and brake.

The MPL-B4560F-MK74AA changes the feedback system from single-turn to multi-turn while retaining the keyless shaft and brake.

The MPL-B4540F-SK72AA is a lower-torque alternative for applications where the B4560F torque capacity is unnecessary.

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34. Five Popular Allen-Bradley Servo Models for Comparison

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

These models provide useful alternatives across different torque, power, speed, and frame-size requirements.

The B430P is oriented toward higher-speed applications.

The B4530F is appropriate for lighter torque requirements.

The B4540F provides an intermediate torque class.

The B4560F provides substantially higher torque while remaining in the 3000 rpm class.

The B540K moves into a larger and higher-power motor category.

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35. B4560F Family Selection Guide

Application Requirement	Recommended Configuration
Single-turn feedback + keyless shaft + no brake	MPL-B4560F-SK72AA
Single-turn feedback + keyless shaft + 24 V brake	MPL-B4560F-SK74AA
Single-turn feedback + keyed shaft + no brake	MPL-B4560F-SJ72AA
Single-turn feedback + keyed shaft + 24 V brake	MPL-B4560F-SJ74AA
Multi-turn feedback + keyless shaft + no brake	MPL-B4560F-MK72AA
Multi-turn feedback + keyless shaft + 24 V brake	MPL-B4560F-MK74AA
Multi-turn feedback + keyed shaft + no brake	MPL-B4560F-MJ72AA
Multi-turn feedback + keyed shaft + 24 V brake	MPL-B4560F-MJ74AA

This table demonstrates why the suffix configuration should be checked carefully before purchasing or replacing an MPL motor.

Two motors can share the same frame, stack, speed, torque, and power rating but still have different shaft, feedback, and brake configurations.

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36. Applications Where SK74AA Is Particularly Suitable

The MPL-B4560F-SK74AA is particularly suitable when all of the following conditions are present:

• The machine uses a 460 V AC class servo system.
• The required motor speed is around 3000 rpm.
• Approximately 3.2 kW output is appropriate.
• Continuous torque requirements are around the 14.1 N·m class.
• Peak acceleration torque is within approximately 34.4 N·m.
• Single-turn high-resolution feedback is sufficient.
• A keyless shaft connection is preferred.
• A 24 V DC holding brake is required.
• The machine can accommodate a 130 mm frame.
• The machine can accommodate the 152.4 mm stack.

This makes the model particularly suitable for vertical servo axes, indexing equipment, packaging machinery, assembly equipment, and material-handling systems.

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37. Advantages for Machine Builders

Compact Servo Package

The 130 mm frame provides a relatively compact mechanical package for the available torque.

Strong Continuous Torque

The 14.1 N·m continuous torque rating provides useful capacity for medium-duty servo axes.

High Peak Torque

The approximately 34.4 N·m peak torque rating supports dynamic acceleration and deceleration.

Fast Dynamic Response

The low-inertia rotor design supports rapid changes in speed.

High-Resolution Feedback

The single-turn encoder provides accurate position feedback.

Keyless Mechanical Connection

The keyless shaft simplifies integration with appropriate clamp-type couplings.

Integrated Holding Brake

The 24 V DC brake is valuable for gravity-loaded and vertical axes.

Flexible Connector Installation

The 180° rotatable right-angle connector helps simplify cable routing.

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38. Installation Considerations

The motor flange should be installed on a rigid machine structure.

The coupling should be aligned according to the coupling manufacturer’s requirements.

The shaft should not be subjected to loads beyond the applicable radial and axial limits.

Installation should also consider:

• Motor mounting
• Shaft alignment
• Coupling balance
• Cable routing
• Connector clearance
• Brake wiring
• Feedback wiring
• Motor cooling
• Vibration
• Shock
• Environmental contamination

A servo motor should not be selected solely because its physical frame appears compatible with an existing motor.

Electrical, feedback, shaft, brake, and mechanical characteristics must all match.

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39. Brake Control Considerations

The integrated 24 V DC brake requires appropriate control logic.

The brake should not simply be switched randomly during high-speed motor operation.

A typical servo sequence coordinates motor torque and brake release so that the motor can take control of the load before the brake is released.

During stopping, the servo system normally brings the axis to a controlled state before the holding brake is engaged.

The exact brake-control sequence depends on the servo drive, motion controller, machine architecture, and safety strategy.

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40. Maintenance Considerations

Routine maintenance should focus on the complete motor and mechanical system.

Recommended inspection areas include:

• Motor mounting bolts
• Coupling condition
• Shaft alignment
• Bearing condition
• Feedback stability
• Motor temperature
• Connector condition
• Power cable condition
• Feedback cable condition
• Brake operation
• Abnormal vibration
• Abnormal noise
• Mechanical backlash
• Load changes

The brake should be checked periodically if it is used frequently.

A brake that shows delayed release, abnormal noise, excessive heating, or inconsistent holding performance should be investigated.

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41. Cable and Connector Installation

The SpeedTEC DIN connector should be installed with appropriate cable clearance.

The cable should not be forced against the machine structure.

Avoid:

• Sharp bends
• Excessive tensile loading
• Crushing
• Abrasion
• Excessive heat
• Moving mechanical components
• High-vibration contact points

The 180° rotatable connector makes it possible to choose a more suitable cable exit direction.

This is particularly useful in machines with multiple servo motors mounted close together.

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42. Environmental Considerations

The application environment should be evaluated before installation.

Important factors include:

• Ambient temperature
• Humidity
• Dust
• Oil
• Water
• Chemicals
• Vibration
• Shock
• Mechanical contamination

The motor should be installed in an environment compatible with the selected configuration.

If the application involves significant liquid exposure or contamination around the shaft, the appropriate sealing arrangement should be evaluated.

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43. Motor Replacement Considerations

When replacing another B4560F motor with the SK74AA, the following points should be checked carefully:

Replacement Item	Check Required
Voltage	460 V AC class compatibility
Speed	3000 rpm
Torque	14.1 N·m continuous
Peak Torque	34.4 N·m
Power	Approx. 3.2 kW
Feedback	Single-turn high-resolution
Shaft	Keyless
Brake	24 V DC
Connector	SpeedTEC DIN
Frame	130 mm
Stack	152.4 mm
Mounting	IEC metric
Weight	Approx. 9.07 kg
Dimensions	Verify exact mechanical drawing
Drive	Verify motor-drive compatibility

A motor with the same basic B4560F frame designation may still have a different feedback device or shaft configuration.

The complete part number should therefore be matched.

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44. Product Selection Advantages Compared With Smaller MPL Motors

The B4560F configuration offers higher torque than the smaller B4530F and B4540F motors.

This can be useful when the machine requires:

• Higher acceleration force
• Larger load inertia
• Higher continuous mechanical load
• Higher peak torque
• Larger ball-screw force
• More demanding indexing

The larger motor should not be selected solely for additional torque margin, however.

If the actual load is significantly below the B4560F capacity, a smaller motor may provide a more economical and physically compact solution.

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45. Product Selection Advantages Compared With Larger MPL Motors

Compared with larger MPL motors such as the B520K or B540K class, the B4560F offers a smaller mechanical package.

This can be advantageous where:

• Machine space is restricted.
• 3.2 kW is sufficient.
• 14.1 N·m continuous torque is sufficient.
• 34.4 N·m peak torque is sufficient.
• A 130 mm frame is preferred.
• The machine does not require a larger motor.

Correct sizing is therefore important.

An oversized servo motor can increase machine cost, physical size, drive requirements, and mechanical integration requirements without providing a practical performance benefit.

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46. Quick Technical Summary

Item	MPL-B4560F-SK74AA
Brand	Allen-Bradley
Product Series	MP-Series MPL Low-Inertia
Product Type	Brushless AC rotary servo motor
Voltage Class	460 V AC
Rated Speed	3000 rpm
Continuous Stall Torque	14.1 N·m
Peak Stall Torque	34.4 N·m
Rated Output	Approx. 3.2 kW
Rotor Inertia	Approx. 0.00078 kg·m²
Frame Size	130 mm
Frame Designation	45
Magnet Stack	152.4 mm
Stack Designation	60
Feedback	Single-turn high-resolution encoder
Encoder Type	Absolute single-turn
Shaft	Keyless
Shaft Key	None
Brake	24 V DC holding brake
Connector	SpeedTEC DIN
Connector Style	Right-angle
Connector Rotation	180°
Mounting	IEC metric
Mounting Holes	Free mounting holes, Type FF
Approx. Dimensions	305 × 229 × 255 mm class
Approx. Weight	9.07 kg
Main Application	Industrial closed-loop servo motion

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47. Overall Product Assessment

The Allen-Bradley MPL-B4560F-SK74AA is a high-performance low-inertia servo motor in the 3.2 kW, 3000 rpm class.

Its combination of 14.1 N·m continuous torque, approximately 34.4 N·m peak torque, low rotor inertia, single-turn high-resolution feedback, keyless shaft, and integrated 24 V DC holding brake makes it suitable for a broad range of industrial automation equipment.

The single-turn high-resolution encoder provides the feedback necessary for precise closed-loop motion control.

The keyless shaft is well suited to clamp-type servo couplings and friction-locking mechanical transmission systems.

The 24 V DC holding brake adds an important mechanical holding function for applications where the load must remain stationary after servo torque is removed.

The 130 mm frame and 152.4 mm stack provide a practical balance between torque output and physical motor size.

The motor is particularly suitable for:

• Packaging machinery
• Material handling
• Automated assembly
• Machine tools
• Vertical positioning
• Ball-screw axes
• Conveyor systems
• Rotary indexing
• Printing and converting
• Electronics manufacturing
• Textile machinery
• General industrial automation

The most important selection distinction for the SK74AA configuration is the combination of single-turn feedback, keyless shaft, and 24 V DC brake.

For a machine requiring a keyed shaft, the SJ74AA configuration is a more appropriate comparison.

For a machine that does not require a brake, the SK72AA configuration can provide a simpler and lighter motor arrangement.

For a machine requiring multi-turn absolute feedback, the MK74AA configuration is a more appropriate alternative.

From a machine-design perspective, the MPL-B4560F-SK74AA is best suited to applications where the motor must deliver substantial torque from a relatively compact 130 mm frame while maintaining accurate closed-loop control and providing a motor-mounted holding brake.

Final selection should be based on the complete motion profile, including continuous torque, RMS torque, peak acceleration torque, load inertia, speed, cycle time, mechanical transmission, shaft loading, environmental conditions, feedback requirements, brake requirements, and servo-drive compatibility.

When these factors are properly matched, the MPL-B4560F-SK74AA provides a strong combination of torque density, dynamic response, positioning capability, mechanical integration flexibility, and holding capability for industrial servo applications.