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Allen-Bradley MPL-B540K-MK74AA Low-Inertia Servo Motor – Complete Product Guide

1. Product Overview

The MPL-B540K-MK74AA is a high-performance low-inertia brushless AC rotary servo motor designed for industrial motion-control applications where fast response, high rotational speed, accurate positioning, and dependable torque performance are required.

This model belongs to the MP-Series MPL low-inertia servo motor family and uses a 460 V class electrical configuration, a 165 mm frame size, and a 101.6 mm magnet-stack length.

The B540K motor class is designed for 4000 RPM operation and provides approximately 5.4 kW of rated output, with approximately 19.4 N·m of continuous stall torque and approximately 48.6 N·m of peak stall torque.

The MPL-B540K-MK74AA has a multi-turn high-resolution absolute encoder, a keyless shaft extension, a right-angle SpeedTEC DIN connector with 180° rotation capability, and an integrated 24 V DC brake.

The keyless shaft is one of the most important differences between the MK74AA configuration and closely related B540K models using a keyed shaft.

For applications where the mechanical transmission uses a clamping-style coupling, shrink-disc arrangement, specialized hub, or another keyless connection, the MK configuration can provide a particularly clean mechanical interface.

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2. Brand

Brand: Allen-Bradley

The MPL-B540K-MK74AA is part of the Allen-Bradley industrial servo motor product range.

For this particular product description, the focus is on the Allen-Bradley product designation, motor construction, specifications, and application characteristics rather than on other corporate information.

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3. Product Series

Product Series: MP-Series MPL

Series Category: Low-Inertia Brushless Servo Motors

The MPL series is designed for industrial motion applications where a servo motor needs to respond quickly to changes in speed, position, and torque.

The low-inertia design is particularly useful in machines that repeatedly accelerate and decelerate.

Typical examples include indexing machinery, packaging equipment, material-handling systems, precision positioning equipment, assembly machinery, and high-speed automated production equipment.

Within the MPL family, the B540K motor class is positioned toward the higher-speed side of the range.

Its 4000 RPM rating makes it different from lower-speed configurations such as the B540D, while its 5.4 kW output and 19.4 N·m continuous torque place it above smaller B520K motors.

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4. Complete Model Number

MPL-B540K-MK74AA

The model number contains information about the motor family and its configuration.

Model Code	Description
MPL	MP-Series MPL low-inertia brushless servo motor
B	460 V class motor configuration
5	Frame size 5
40	Magnet stack designation, 101.6 mm
K	4000 RPM motor configuration
M	Multi-turn high-resolution absolute feedback
K	Keyless shaft extension
7	SpeedTEC DIN right-angle connector, 180° rotatable
4	24 V DC brake
AA	Configuration suffix

The most important detail for distinguishing this model from MPL-B540K-MJ74AA is the shaft configuration.

The MK74AA uses a keyless shaft, while the MJ74AA configuration uses a keyed shaft. The remaining major motor performance characteristics are closely related.

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5. Main Technical Specifications

Parameter	Specification
Model	MPL-B540K-MK74AA
Brand	Allen-Bradley
Product Series	MP-Series MPL
Motor Type	Low-inertia brushless AC servo motor
Electrical Class	460 V AC
System Class	480 V AC
Frame Size	165 mm
Frame Size	6.50 in
Magnet Stack	101.6 mm
Magnet Stack	4.0 in
Rated Speed	4000 RPM
Maximum Speed	4000 RPM
Rated Output	Approximately 5.4 kW
Continuous Stall Torque	Approximately 19.4 N·m
Peak Stall Torque	Approximately 48.6 N·m
Feedback	Multi-turn high-resolution absolute encoder
Shaft	Keyless shaft extension
Brake	24 V DC brake
Connector	SpeedTEC DIN
Connector Orientation	Right angle
Connector Rotation	180° rotatable
Mounting	IEC metric
Mounting Holes	Free mounting holes, Type FF
Rotor Inertia	Approximately 0.00147 kg·m²
Standard Protection	IP50
Higher Protection Configuration	IP66 with suitable sealing arrangement
Approximate Weight	15.0 kg
Frame Dimension	165 mm
Magnet Stack Dimension	101.6 mm

The B540K motor class is specified at 4000 RPM, 19.4 N·m continuous stall torque, 48.6 N·m peak stall torque, approximately 5.4 kW output, and approximately 0.00147 kg·m² rotor inertia.

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6. Dimensions

The motor uses a 165 mm frame size and a 101.6 mm magnet stack.

These dimensions identify the primary motor frame and active stack configuration.

Dimension / Mechanical Parameter	Specification
Model	MPL-B540K-MK74AA
Frame Size	165 mm
Frame Size	6.50 in
Magnet Stack	101.6 mm
Magnet Stack	4.0 in
Mounting Standard	IEC Metric
Shaft Configuration	Keyless
Shaft Type	Keyless shaft extension
Connector	Right-angle DIN
Connector Rotation	180°
Brake	24 V DC
Approximate Weight	15.0 kg

The 165 mm frame size and 101.6 mm stack length are not the same as the complete motor envelope dimensions.

The total installed space also depends on the shaft extension, flange, connector orientation, brake housing, cable routing, and mounting arrangement.

For machine layout work, the mechanical drawing should therefore be used for exact overall length, shaft projection, mounting-hole locations, pilot dimensions, and connector clearance.

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7. Weight

The B540K motor class is approximately 15.0 kg in the technical motor data.

Weight Parameter	Value
Model	MPL-B540K-MK74AA
Approximate Motor Weight	15.0 kg
Weight in Pounds	Approx. 33 lb
Frame Size	165 mm
Stack Length	101.6 mm

The stated motor weight should be distinguished from shipping or packaged weight.

When designing a moving machine axis, the motor’s actual installed mass should be included in the moving-load calculation.

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8. Electrical Characteristics

The MPL-B540K-MK74AA belongs to the 460 V class of the MPL servo motor family.

It is intended to be used with a compatible servo drive and motion-control system.

The motor provides approximately 5.4 kW of rated output at its 4000 RPM operating point.

Electrical Parameter	Specification
Model	MPL-B540K-MK74AA
Voltage Class	460 V AC
System Voltage Class	480 V
Rated Output	5.4 kW
Rated Speed	4000 RPM
Continuous Stall Torque	19.4 N·m
Peak Stall Torque	48.6 N·m
Rotor Inertia	0.00147 kg·m²
Brake Supply	24 V DC
Motor Construction	Brushless AC servo
Feedback	Multi-turn absolute

The combination of relatively high speed and substantial torque is one of the main reasons the B540K configuration is useful in high-cycle automated machinery.

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9. Speed Performance

The MPL-B540K-MK74AA is a 4000 RPM servo motor.

This speed rating makes it suitable for applications where machine productivity depends on rapid axis movement and short cycle times.

The motor can be particularly useful for rotary mechanisms and mechanical transmissions that are designed to take advantage of higher motor speed.

Speed Characteristic	Value
Model	MPL-B540K-MK74AA
Rated Speed	4000 RPM
Maximum Speed	4000 RPM
Rated Output	5.4 kW
Continuous Stall Torque	19.4 N·m
Peak Stall Torque	48.6 N·m

The actual usable speed in a machine depends on the drive configuration, mechanical transmission, load, acceleration profile, temperature, and other operating conditions.

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10. Torque Performance

The B540K provides approximately 19.4 N·m of continuous stall torque.

Its peak stall torque is approximately 48.6 N·m.

This combination gives the motor a useful balance between continuous mechanical capability and short-duration acceleration performance.

Torque Parameter	Specification
Model	MPL-B540K-MK74AA
Continuous Stall Torque	19.4 N·m
Peak Stall Torque	48.6 N·m
Rated Output	5.4 kW
Rated Speed	4000 RPM

The continuous torque rating is particularly important for determining whether the motor can handle the machine’s sustained load.

The peak torque rating is more relevant to acceleration, deceleration, indexing, rapid direction changes, and other short-duration operating conditions.

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11. Multi-Turn Absolute Feedback

The M designation identifies the multi-turn high-resolution absolute feedback configuration.

The encoder provides the feedback required for accurate servo control.

This makes the motor suitable for machines where position accuracy and repeatability are important.

Typical applications include:

• Precision linear axes
• Ball-screw positioning
• Rotary indexing
• Packaging systems
• Assembly machinery
• Automated inspection
• Material handling
• High-speed transfer
• Multi-axis coordinated motion

The multi-turn configuration is particularly useful where the motor shaft can rotate through multiple revolutions during normal machine movement.

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12. Keyless Shaft Configuration

The K immediately following the feedback designation is an important feature of this model.

The MPL-B540K-MK74AA uses a keyless shaft extension.

This differentiates it from the closely related MPL-B540K-MJ74AA, which uses a keyed shaft.

Shaft Characteristic	MPL-B540K-MK74AA
Shaft Type	Keyless
Shaft Extension	Keyless shaft extension
Typical Connection	Clamping-style coupling or suitable keyless mechanical connection
Mechanical Benefit	Clean shaft interface and flexible coupling selection
Keyway	Not used in the standard keyless configuration

A keyless shaft can be advantageous when the mechanical system uses a precision clamping coupling.

It can also be useful when the machine designer wants to avoid the dimensional limitations associated with a conventional keyway.

However, the coupling must be properly selected and tightened according to its mechanical requirements.

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13. Keyless Shaft vs. Keyed Shaft

The difference between the two configurations is worth highlighting.

Feature	MPL-B540K-MK74AA	MPL-B540K-MJ74AA
Shaft	Keyless	Keyed
Speed	4000 RPM	4000 RPM
Output	5.4 kW	5.4 kW
Continuous Torque	19.4 N·m	19.4 N·m
Peak Torque	48.6 N·m	48.6 N·m
Feedback	Multi-turn absolute	Multi-turn absolute
Brake	24 V DC	24 V DC
Frame	165 mm	165 mm
Stack	101.6 mm	101.6 mm
Primary Difference	Keyless mechanical interface	Keyed mechanical interface

If the machine already uses a keyless coupling, the MK74AA is the natural configuration to consider.

If the existing mechanical transmission requires a conventional keyway, the MJ74AA configuration may be more appropriate.

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14. Integrated 24 V DC Brake

The MPL-B540K-MK74AA includes a 24 V DC brake.

The brake provides a mechanical holding function and can be especially useful on vertical axes.

Typical applications include:

• Vertical lifting systems
• Z-axis machinery
• Ball-screw vertical slides
• Elevating mechanisms
• Gravity-loaded positioning systems
• Automated loading equipment

The brake should be considered primarily as a holding mechanism.

The servo drive should normally control the machine’s normal deceleration and stopping sequence.

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15. Connector Configuration

The motor uses a SpeedTEC DIN connector in a right-angle arrangement.

The connector can be rotated through approximately 180°.

This provides additional flexibility when installing the motor in compact machinery.

Connector Parameter	Specification
Model	MPL-B540K-MK74AA
Connector Type	SpeedTEC DIN
Orientation	Right angle
Rotation	180°
Connection Style	Quick-connect arrangement
Installation Benefit	Flexible cable routing

The connector configuration can be particularly helpful when multiple servo motors are mounted close together.

Cable clearance should be considered during machine design because the connector and cable assembly require sufficient bending space.

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16. Mounting Configuration

The motor uses an IEC metric mounting arrangement.

The frame size is 165 mm, and the product configuration uses free mounting holes.

Mounting Parameter	Specification
Model	MPL-B540K-MK74AA
Mounting Standard	IEC Metric
Frame Size	165 mm
Mounting Hole Type	Free mounting holes
Mounting Configuration	Flange mounted
Shaft	Keyless
Brake	24 V DC

The mounting surface should be rigid and accurately aligned.

Improper mounting or shaft alignment can result in increased vibration, coupling wear, bearing loading, and reduced machine accuracy.

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17. Protection Characteristics

The standard motor configuration is associated with IP50 protection.

A higher protection arrangement can be achieved with suitable sealing and environmental protection accessories.

Protection Parameter	Specification
Model	MPL-B540K-MK74AA
Standard Protection	IP50
Higher Protection Configuration	IP66
Shaft Seal	Configuration dependent
Cable Sealing	Configuration dependent

The actual protection level of a complete motor installation depends on the motor configuration, shaft sealing, cable connection, connectors, and machine environment.

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18. Environmental Considerations

The motor is intended for industrial environments where temperature, humidity, vibration, and mechanical shock must be considered during machine design.

Environmental Parameter	Typical Value
Model	MPL-B540K-MK74AA
Operating Temperature	Approximately 0–40 °C
Storage Temperature	Approximately -30–70 °C
Relative Humidity	5–95%, non-condensing
Shock	Up to approximately 20 g
Vibration	Approximately 2.5 m/s²

The actual machine environment should always be evaluated before installation.

High ambient temperature, restricted ventilation, excessive vibration, moisture, dust, or chemical exposure can affect motor performance and service life.

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19. Rotor Inertia

The B540K motor has a rotor inertia of approximately 0.00147 kg·m².

Rotor inertia is an important parameter in servo sizing because the control system must accelerate and decelerate both the motor rotor and the reflected load.

Inertia Parameter	Value
Model	MPL-B540K-MK74AA
Rotor Inertia	Approx. 0.00147 kg·m²
Motor Type	Low-inertia servo
Rated Speed	4000 RPM
Continuous Torque	19.4 N·m

The actual system inertia can be much larger than the motor’s rotor inertia because gears, couplings, screws, belts, pulleys, tables, fixtures, and workpieces all contribute to the total reflected inertia.

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20. Main Product Advantages

High 4000 RPM Speed

The 4000 RPM rating allows the MPL-B540K-MK74AA to support high-speed machine cycles.

This is especially useful in packaging, indexing, material feeding, rotary processing, and high-speed positioning.

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5.4 kW Output

The approximately 5.4 kW output places the B540K above smaller MPL motor configurations.

This provides enough capacity for many medium-to-heavy industrial motion axes while retaining the advantages of a relatively high-speed motor.

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Strong Continuous Torque

The approximately 19.4 N·m continuous stall torque gives the motor a solid continuous torque capability.

This makes it suitable for applications where the axis must maintain load torque for extended periods.

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High Peak Torque

The approximately 48.6 N·m peak torque provides additional capacity during short acceleration events.

This can be important for high-cycle machinery.

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Multi-Turn Absolute Feedback

The multi-turn high-resolution absolute encoder is well suited to precision motion applications.

It provides a feedback architecture appropriate for machines requiring accurate positioning and repeatability.

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Keyless Shaft

The keyless shaft is a major mechanical advantage for machines designed around precision clamping couplings.

It can provide a clean mechanical interface without relying on a conventional shaft key.

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Integrated 24 V DC Brake

The brake provides mechanical holding capability.

This makes the motor particularly useful for vertical axes and other applications where the load should remain stationary when servo torque is removed.

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Rotatable Right-Angle Connector

The 180° rotatable right-angle connector provides installation flexibility.

This can simplify cable routing in compact machine designs.

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Low-Inertia Construction

The low-inertia design is intended to provide fast response.

It is particularly useful for applications involving frequent acceleration, deceleration, indexing, and direction changes.

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21. Typical Applications

Packaging Machinery

The MPL-B540K-MK74AA is well suited to packaging machinery requiring rapid and repeatable motion.

Potential applications include:

• Product indexing
• Film feeding
• Packaging transfer
• Rotary cutting
• Sealing mechanisms
• Label positioning
• High-speed feeding
• Product alignment

The combination of 4000 RPM speed and high-resolution absolute feedback makes the motor useful for demanding packaging axes.

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22. Material Handling

Material-handling equipment often requires rapid movement combined with controlled positioning.

Typical applications include:

• Transfer axes
• Conveyor positioning
• Pick-and-place systems
• Automated loading
• Product sorting
• Rotary transfer systems
• High-speed indexing

The low-inertia motor design can help the axis respond quickly to repeated motion commands.

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23. Ball-Screw Applications

The MPL-B540K-MK74AA can be used with a ball screw to produce controlled linear motion.

Typical applications include:

• Precision positioning tables
• Assembly axes
• Inspection systems
• Automated tooling
• Machine slides
• Vertical Z axes
• Transfer mechanisms

The motor’s 4000 RPM capability can provide high linear speed when paired with an appropriate screw pitch.

However, ball-screw critical speed and mechanical limits must be considered when operating at high motor speed.

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24. Electronic Assembly

Electronic assembly equipment often requires fast positioning and repeatable movement.

The motor can be considered for:

• Component positioning
• Automated assembly
• Precision indexing
• Inspection stations
• Transfer mechanisms
• Pick-and-place axes
• Automated tooling

The absolute feedback system is useful for applications in which the controller requires accurate position information.

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25. Machine Tool and Automated Equipment

The motor can also be applied to various automated machine axes.

Potential uses include:

• Tool positioning
• Rotary axes
• Feed mechanisms
• Automatic adjustment systems
• Precision slides
• Workpiece positioning
• Automated production stations

The exact suitability depends on the machine’s torque, inertia, speed, acceleration, and duty-cycle requirements.

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26. Vertical Axis Applications

The 24 V DC brake makes this model especially interesting for vertical-axis applications.

For example, a vertical ball-screw axis may require the motor to hold the load when the servo drive is disabled.

The integrated brake can provide mechanical holding capability.

Possible applications include:

• Z-axis positioning
• Vertical lifting
• Automated loading
• Vertical transfer
• Elevating mechanisms
• Gravity-loaded machine axes

The brake should still be integrated into the overall machine control and safety design.

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27. Five Recommended Related Models

The following five models are closely related to the MPL-B540K-MK74AA and provide useful alternatives for different mechanical and motion requirements.

Model	Rated Speed	Output	Continuous Torque	Peak Torque	Frame / Stack	Feedback	Shaft	Brake	Approx. Weight
MPL-B540K-MJ74AA	4000 RPM	5.4 kW	19.4 N·m	48.6 N·m	165 / 101.6 mm	Multi-turn absolute	Keyed	24 V DC	Approx. 15 kg
MPL-B540K-MK72AA	4000 RPM	5.4 kW	19.4 N·m	48.6 N·m	165 / 101.6 mm	Multi-turn absolute	Keyless	No brake	Approx. 15 kg
MPL-B540K-SK74AA	4000 RPM	5.4 kW	19.4 N·m	48.6 N·m	165 / 101.6 mm	Single-turn high-resolution	Keyless	24 V DC	Approx. 15 kg
MPL-B540D-MK74AA	2000 RPM	3.4 kW	19.4 N·m	41.0 N·m	165 / 101.6 mm	Multi-turn absolute	Keyless	24 V DC	Approx. 15 kg
MPL-B560F-MK74AA	3000 RPM	5.5 kW	26.8 N·m	67.8 N·m	165 / 152.4 mm	Multi-turn high-resolution	Keyless	24 V DC	Approx. 20.2 kg

The B540K family includes multiple combinations of multi-turn or single-turn feedback, keyed or keyless shafts, and brake or no-brake configurations. The B540D provides a lower-speed alternative, while the B560F increases the available torque.

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28. Five Same-Brand Popular Models

The following models represent useful comparisons within the same Allen-Bradley MPL servo motor family.

Model	Rated Speed	Maximum Speed	Rated Output	Continuous Torque	Peak Torque	Rotor Inertia	Approx. Weight
MPL-B520K	4000 RPM	4000 RPM	3.5 kW	10.7 N·m	23.2 N·m	0.000783 kg·m²	9.8 kg
MPL-B540D	2000 RPM	2000 RPM	3.4 kW	19.4 N·m	41.0 N·m	0.00147 kg·m²	15.0 kg
MPL-B540K	4000 RPM	4000 RPM	5.4 kW	19.4 N·m	48.6 N·m	0.00147 kg·m²	15.0 kg
MPL-B560F	3000 RPM	3000 RPM	5.5 kW	26.8 N·m	67.8 N·m	0.00213 kg·m²	20.2 kg
MPL-B580F	3000 RPM	3000 RPM	7.1 kW	34.0 N·m	87.0 N·m	0.00289 kg·m²	25.4 kg

These models provide a useful progression from smaller, lighter motors to higher-torque configurations.

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29. MPL-B520K

The MPL-B520K is a smaller motor class compared with the B540K.

It provides approximately 3.5 kW of output and 10.7 N·m continuous stall torque.

Its approximately 9.8 kg weight makes it attractive for applications where machine size and moving mass need to be minimized.

It is a reasonable choice when the load does not require the higher torque capacity of the B540K.

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30. MPL-B540D

The MPL-B540D provides approximately 19.4 N·m continuous stall torque but operates at a lower 2000 RPM speed.

This makes it suitable for applications where higher torque at moderate speed is more important than maximum rotational speed.

Compared with the B540K, the B540D provides a lower-speed solution in a similar frame and stack class.

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31. MPL-B540K

The MPL-B540K represents the basic B540K performance class.

It provides:

• 4000 RPM speed
• 5.4 kW output
• 19.4 N·m continuous torque
• Approximately 48.6 N·m peak torque
• Approximately 0.00147 kg·m² rotor inertia

The final suffix determines the specific feedback, shaft, connector, and brake configuration.

The MPL-B540K-MK74AA is therefore a particular configuration within this broader motor class.

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32. MPL-B560F

The MPL-B560F provides higher torque than the B540K.

Its approximately 26.8 N·m continuous torque and approximately 67.8 N·m peak torque make it suitable for heavier loads.

Its speed is approximately 3000 RPM, so it is more torque-oriented than the B540K.

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33. MPL-B580F

The MPL-B580F provides approximately 7.1 kW output and 34.0 N·m continuous torque.

Its peak torque is approximately 87.0 N·m.

This motor is a better candidate for heavier-duty applications where the B540K does not provide enough continuous or peak torque.

The trade-off is increased motor size, rotor inertia, and weight.

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34. Comparison of Popular Models

Characteristic	MPL-B540K-MK74AA	MPL-B540D	MPL-B560F	MPL-B580F
Speed	4000 RPM	2000 RPM	3000 RPM	3000 RPM
Output	5.4 kW	3.4 kW	5.5 kW	7.1 kW
Continuous Torque	19.4 N·m	19.4 N·m	26.8 N·m	34.0 N·m
Peak Torque	48.6 N·m	41.0 N·m	67.8 N·m	87.0 N·m
Rotor Inertia	0.00147 kg·m²	0.00147 kg·m²	0.00213 kg·m²	0.00289 kg·m²
Approx. Weight	15.0 kg	15.0 kg	20.2 kg	25.4 kg
Primary Characteristic	High speed + keyless shaft	Moderate speed	Higher torque	High power and torque

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35. MPL-B540K-MK74AA vs. MPL-B540K-MK72AA

These two models are extremely close.

The major difference is the brake configuration.

Parameter	MPL-B540K-MK74AA	MPL-B540K-MK72AA
Speed	4000 RPM	4000 RPM
Rated Output	5.4 kW	5.4 kW
Continuous Torque	19.4 N·m	19.4 N·m
Peak Torque	48.6 N·m	48.6 N·m
Feedback	Multi-turn absolute	Multi-turn absolute
Shaft	Keyless	Keyless
Brake	24 V DC	No brake
Frame	165 mm	165 mm
Stack	101.6 mm	101.6 mm
Weight	Approx. 15 kg	Approx. 15 kg

If the machine requires a holding brake, the MK74AA is the appropriate configuration to consider.

If the application does not require a motor brake, the MK72AA provides a similar motor performance class without the brake configuration.

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36. MPL-B540K-MK74AA vs. MPL-B540K-MJ74AA

This is one of the most important comparisons for replacement work.

Parameter	MPL-B540K-MK74AA	MPL-B540K-MJ74AA
Speed	4000 RPM	4000 RPM
Output	5.4 kW	5.4 kW
Continuous Torque	19.4 N·m	19.4 N·m
Peak Torque	48.6 N·m	48.6 N·m
Feedback	Multi-turn absolute	Multi-turn absolute
Shaft	Keyless	Keyed
Brake	24 V DC	24 V DC
Frame	165 mm	165 mm
Stack	101.6 mm	101.6 mm
Primary Difference	Keyless shaft	Keyed shaft

The two models have essentially the same major B540K performance characteristics.

The mechanical shaft interface is the critical difference.

Therefore, they should not automatically be treated as mechanically interchangeable.

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37. MPL-B540K-MK74AA vs. MPL-B540D-MK74AA

Parameter	MPL-B540K-MK74AA	MPL-B540D-MK74AA
Speed	4000 RPM	2000 RPM
Output	5.4 kW	3.4 kW
Continuous Torque	19.4 N·m	19.4 N·m
Peak Torque	48.6 N·m	41.0 N·m
Feedback	Multi-turn absolute	Multi-turn absolute
Shaft	Keyless	Keyless
Brake	24 V DC	24 V DC
Frame	165 mm	165 mm
Stack	101.6 mm	101.6 mm
Approx. Weight	15.0 kg	15.0 kg

The B540K is the better choice when high speed and machine cycle time are priorities.

The B540D is more appropriate when 2000 RPM is sufficient and the machine does not require the additional high-speed capability.

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38. MPL-B540K-MK74AA vs. MPL-B560F

Parameter	MPL-B540K-MK74AA	MPL-B560F
Speed	4000 RPM	3000 RPM
Output	5.4 kW	5.5 kW
Continuous Torque	19.4 N·m	26.8 N·m
Peak Torque	48.6 N·m	67.8 N·m
Stack	101.6 mm	152.4 mm
Rotor Inertia	0.00147 kg·m²	0.00213 kg·m²
Weight	15.0 kg	20.2 kg
Main Advantage	Higher speed	Higher torque

The B560F should be considered when load torque is the primary concern.

The B540K should be considered when high speed and rapid dynamic response are more important.

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39. Mechanical Installation

The motor should be mounted to a rigid machine structure.

The motor flange and mounting surface should be clean and properly aligned.

Because the MPL-B540K-MK74AA uses a keyless shaft, coupling selection becomes particularly important.

A suitable keyless coupling should be selected according to:

• Shaft diameter
• Required torque
• Maximum RPM
• Radial load
• Axial load
• Shaft runout
• Misalignment
• Coupling clamping force
• Required service life

The coupling should be capable of safely transmitting the motor’s maximum expected torque.

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40. Keyless Coupling Considerations

A keyless shaft does not mean that any standard coupling can be used.

The coupling must be compatible with the actual shaft dimensions and must provide sufficient clamping force.

The coupling should also be suitable for 4000 RPM operation.

Correct installation is essential.

Insufficient clamping force can cause shaft slippage.

Excessive or uneven tightening can cause mechanical problems.

The coupling manufacturer’s installation procedure should therefore be followed carefully.

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41. Ball-Screw Selection

When the motor is connected to a ball screw, the machine designer should consider:

• Screw pitch
• Linear travel speed
• Required thrust
• Moving mass
• Acceleration
• Deceleration
• Screw efficiency
• Screw critical speed
• Reflected inertia
• Coupling inertia
• Motor rotor inertia

A 4000 RPM motor can produce high linear speed when connected to a suitable high-pitch ball screw.

However, the screw itself must be capable of operating safely at the resulting rotational speed.

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42. Packaging Machine Selection

For packaging equipment, the motor’s combination of speed and torque can be particularly useful.

The MPL-B540K-MK74AA can be considered for:

• High-speed indexing
• Product feeding
• Film feeding
• Rotary cutting
• Packaging positioning
• Sealing mechanisms
• Label positioning
• Transfer systems

The absolute feedback and high-speed capability make it suitable for machines requiring repeatable positioning over short cycle times.

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43. Vertical Axis Selection

For a vertical axis, the integrated brake can be an important reason for selecting the MK74AA configuration.

The motor can provide controlled servo movement while the brake provides mechanical holding when required.

The complete machine design should consider:

• Load weight
• Center of gravity
• Screw pitch
• Brake holding torque
• Acceleration
• Deceleration
• Emergency stopping requirements
• Mechanical safety provisions

The brake should not be considered a substitute for all required machine safety functions.

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44. Maintenance Recommendations

Regular inspection can help maintain reliable operation.

Recommended inspection items include:

• Motor mounting bolts
• Coupling condition
• Keyless coupling clamping
• Shaft alignment
• Cable condition
• Connector condition
• Brake operation
• Motor temperature
• Abnormal vibration
• Abnormal noise
• Positioning accuracy
• Encoder feedback

A gradual increase in vibration or positioning error can indicate a mechanical or control-system issue.

The keyless coupling should receive particular attention because the mechanical connection depends on proper clamping.

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45. Replacement Checklist

Before replacing an existing motor with the MPL-B540K-MK74AA, the following characteristics should be compared.

Replacement Item	Required Specification
Model	MPL-B540K-MK74AA
Voltage	460 V class
Speed	4000 RPM
Rated Output	5.4 kW
Continuous Torque	19.4 N·m
Peak Torque	48.6 N·m
Frame	165 mm
Stack	101.6 mm
Feedback	Multi-turn absolute
Shaft	Keyless
Brake	24 V DC
Connector	Right-angle DIN
Connector Rotation	180°
Mounting	IEC metric
Weight	Approx. 15.0 kg
Protection	IP50 standard
Rotor Inertia	Approx. 0.00147 kg·m²

The shaft configuration should receive special attention.

A keyed motor and a keyless motor may have similar electrical specifications but are not necessarily direct mechanical replacements.

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46. Complete Parameter Summary

Category	Parameter	Specification
Product	Model	MPL-B540K-MK74AA
Product	Brand	Allen-Bradley
Product	Series	MP-Series MPL
Product	Motor Category	Low-Inertia Servo Motor
Motor	Construction	Brushless AC Servo
Electrical	Voltage Class	460 V AC
Electrical	System Class	480 V
Electrical	Rated Output	5.4 kW
Speed	Rated Speed	4000 RPM
Speed	Maximum Speed	4000 RPM
Torque	Continuous Stall Torque	19.4 N·m
Torque	Peak Stall Torque	48.6 N·m
Feedback	Type	Multi-turn high-resolution absolute
Shaft	Configuration	Keyless
Brake	Type	24 V DC
Connector	Type	SpeedTEC DIN
Connector	Orientation	Right angle
Connector	Rotation	180°
Frame	Frame Size	165 mm
Frame	Imperial Size	6.50 in
Stack	Magnet Stack	101.6 mm
Stack	Imperial Size	4.0 in
Mounting	Standard	IEC Metric
Mounting	Hole Configuration	Free mounting holes, Type FF
Rotor	Inertia	Approx. 0.00147 kg·m²
Protection	Standard	IP50
Protection	Higher Configuration	IP66 with suitable sealing
Environment	Operating Temperature	Approx. 0–40 °C
Environment	Storage Temperature	Approx. -30–70 °C
Environment	Humidity	5–95%, non-condensing
Physical	Frame Dimension	165 mm
Physical	Stack Dimension	101.6 mm
Physical	Approximate Weight	15.0 kg

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47. Product Advantages at a Glance

Advantage	Description
High-Speed Performance	4000 RPM rating supports rapid machine cycles
5.4 kW Output	Suitable for medium-to-heavy industrial motion applications
Strong Continuous Torque	Approximately 19.4 N·m
High Peak Torque	Approximately 48.6 N·m
Absolute Feedback	Multi-turn high-resolution feedback
Keyless Shaft	Suitable for compatible clamping-style mechanical connections
Integrated Brake	24 V DC holding brake
Flexible Connector	Right-angle connector with 180° rotation
Low-Inertia Design	Fast response during acceleration and deceleration
Industrial Mounting	IEC metric mounting configuration
Compact Motor Class	165 mm frame with 101.6 mm stack
Moderate Weight	Approximately 15 kg

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48. Recommended Model Selection

Application Requirement	Recommended Model
4000 RPM + keyless shaft + brake	MPL-B540K-MK74AA
4000 RPM + keyless shaft without brake	MPL-B540K-MK72AA
4000 RPM + keyed shaft + brake	MPL-B540K-MJ74AA
4000 RPM + keyless + single-turn feedback	MPL-B540K-SK74AA
2000 RPM + keyless + brake	MPL-B540D-MK74AA
3000 RPM + higher torque	MPL-B560F-MK74AA
Smaller and lighter motor	MPL-B520K
Higher power and torque	MPL-B580F

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49. Overall Product Assessment

The MPL-B540K-MK74AA is a high-speed, low-inertia servo motor designed for industrial machines requiring accurate motion, fast response, substantial torque, and mechanical holding capability.

Its most important characteristics are the combination of 4000 RPM speed, approximately 5.4 kW output, 19.4 N·m continuous torque, approximately 48.6 N·m peak torque, multi-turn absolute feedback, keyless shaft construction, and a 24 V DC brake.

The keyless shaft is particularly important.

Compared with the keyed-shaft MJ74AA configuration, the MK74AA is intended for mechanical systems that use a compatible keyless connection.

This can be advantageous for precision coupling arrangements and machines where a conventional shaft key is undesirable.

The motor’s 4000 RPM speed also makes it suitable for high-cycle production equipment.

For packaging machinery, material handling, precision positioning, assembly systems, ball-screw axes, indexing equipment, and other automated machinery, the motor provides a useful combination of speed and torque.

The integrated brake further expands its usefulness to vertical and gravity-loaded applications.

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50. Final Recommendation

The MPL-B540K-MK74AA is best suited to applications requiring a high-speed 4000 RPM servo motor with approximately 5.4 kW output, 19.4 N·m continuous torque, multi-turn absolute feedback, a keyless shaft, and an integrated 24 V DC holding brake.

Its main strengths are its high speed, strong torque-to-size ratio, low-inertia response, absolute feedback, flexible connector arrangement, and keyless mechanical interface.

For a high-speed automated machine, the B540K configuration offers a strong balance between performance and physical size.

If the machine requires a keyed shaft, the closely related MPL-B540K-MJ74AA should be considered instead.

If the machine does not need a brake, the MPL-B540K-MK72AA is a logical alternative.

If the machine requires substantially more continuous torque, the MPL-B560F or MPL-B580F class may be more appropriate.

For applications where speed, precise positioning, and mechanical holding are all important, the MPL-B540K-MK74AA is a particularly useful configuration within the MPL low-inertia servo motor family.