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MPL-B560F-MJ74AA Low-Inertia Servo Motor – Complete Product Guide

1. Product Overview

The MPL-B560F-MJ74AA is a low-inertia rotary servo motor from the MPL servo motor family. It is designed for industrial motion-control applications where accurate positioning, controlled acceleration and deceleration, repeatable movement, and dependable torque performance are important.

This model belongs to the 460 V class and uses a 165 mm frame with a 152.4 mm magnet stack. It is rated for 3000 RPM and incorporates a multi-turn high-resolution absolute encoder. The motor also uses a keyed shaft extension and a 24 V DC holding brake, making it particularly useful for applications where the load must remain mechanically secured when the servo is stopped or powered down.

The combination of a relatively compact frame, 5.5 kW rated output, 26.8 N·m continuous torque, and 67.8 N·m peak torque gives the MPL-B560F-MJ74AA a useful balance between power density and mechanical controllability. The model is especially suitable for machine axes that require repeated positioning, rapid cycling, and controlled movement rather than simple constant-speed rotation.

2. Brand

Brand: Allen-Bradley

Allen-Bradley is the product brand associated with this servo motor family. The MPL series is part of the manufacturer’s broader industrial motion-control product range and is commonly used in automated machinery, servo positioning systems, material-handling equipment, packaging machinery, and other industrial motion applications.

For equipment replacement work, the complete catalog number is important because different suffix combinations can change feedback type, shaft configuration, brake configuration, connector arrangement, and other mechanical or electrical characteristics.

3. Product Series

Series: MPL Low-Inertia Brushless Servo Motors

The MPL family is built around low-inertia brushless servo motor technology. The B560F size represents a relatively substantial motor within the smaller and medium frame portion of the MPL family.

The B560F motor family is rated at approximately 5.5 kW, 3000 RPM, 26.8 N·m continuous torque, and 67.8 N·m peak torque. The family technical data also lists approximately 20.2 kg for the B560F motor size.

The MJ74AA suffix identifies a particular configuration of the B560F motor. In this configuration, the motor uses multi-turn absolute feedback, a keyed shaft, and a 24 V DC brake.

4. Model Number Identification

The model number can be understood as a combination of several important configuration characteristics.

Item	Configuration
Model	MPL-B560F-MJ74AA
Product family	MPL Low-Inertia Brushless Servo Motor
Voltage class	460 V
Frame size	165 mm
Magnet stack	152.4 mm
Rated speed	3000 RPM
Feedback	Multi-turn high-resolution absolute encoder
Shaft	Keyed shaft extension
Connector	SpeedTEC DIN, right-angle, 180° rotatable
Brake	24 V DC brake
Mounting	IEC metric
Mounting holes	Free mounting holes, Type FF
Motor type	Rotary servo motor

The catalog configuration is specifically identified as a 460 V, 165 mm frame, 152.4 mm stack, 3000 RPM motor with multi-turn high-resolution absolute feedback, keyed shaft, SpeedTEC DIN connector, and 24 V DC brake.

5. Main Technical Specifications

The following table summarizes the principal specifications of the MPL-B560F-MJ74AA and the B560F motor size.

Parameter	Specification
Model	MPL-B560F-MJ74AA
Brand	Allen-Bradley
Series	MPL Low-Inertia
Motor type	Rotary brushless servo motor
Voltage	460 V
Voltage class	400 V-class / 460 V motor
Rated speed	3000 RPM
Maximum listed speed	3000 RPM
Rated output power	5.5 kW
Continuous torque	26.8 N·m
Peak torque	67.8 N·m
Frame size	165 mm
Magnet stack length	152.4 mm
Feedback	Multi-turn high-resolution absolute encoder
Shaft configuration	Keyed shaft extension
Brake	24 V DC integral brake
Connector	SpeedTEC DIN, right-angle
Connector adjustment	180° rotatable
Mounting	IEC metric
Mounting holes	Free mounting holes, Type FF
Rotor inertia	Approximately 0.00213 kg·m² for the B560F family
Weight	Approximately 20.2 kg family reference
Overall dimensions	Verify exact L × W × H from the mechanical drawing
Shaft seal	Configuration-dependent; verify exact drawing/specification
Operating environment reference	Performance data commonly based around 40 °C motor ambient

The primary performance figures for the B560F family are 3000 RPM, 26.8 N·m continuous torque, 67.8 N·m peak torque, 5.5 kW rated output, approximately 0.00213 kg·m² rotor inertia, and approximately 20.2 kg motor weight.

6. Dimensions

One of the most important mechanical characteristics of the MPL-B560F-MJ74AA is its 165 mm frame size and 152.4 mm magnet stack length.

Dimension Item	Specification
Model	MPL-B560F-MJ74AA
Frame size	165 mm
Frame size in inches	6.50 in
Magnet stack length	152.4 mm
Magnet stack in inches	6.0 in
Mounting standard	IEC metric
Mounting holes	Type FF free mounting holes
Overall L × W × H	Must be confirmed from exact mechanical drawing

The 165 mm frame dimension and 152.4 mm stack length are directly associated with the B560F configuration.

It is important not to treat the 165 mm frame size as the complete external motor height, width, or total length. The actual installed envelope also depends on the flange, shaft extension, connector arrangement, brake configuration, and other mechanical features.

For replacement work, the complete mechanical drawing should therefore be checked before assuming that the motor can be installed into the exact space occupied by another motor.

7. Weight

The B560F motor size is listed at approximately 20.2 kg in the technical performance data.

Parameter	Value
Model	MPL-B560F-MJ74AA
Approximate motor family weight	20.2 kg
Approximate weight in pounds	44.5 lb
Weight category	Medium/heavy industrial servo motor

The 20.2 kg figure should be treated as a B560F family reference rather than as a substitute for the exact shipping or packaged weight of a particular unit. Accessories, cables, mounting hardware, packaging, and configuration differences can affect the final delivered weight.

8. Rated Power

The B560F motor family provides approximately 5.5 kW of rated motor output.

A 5.5 kW servo motor is suitable for applications that require considerably more mechanical output than small indexing motors while still retaining the rapid dynamic response expected from a servo system.

The 5.5 kW rating is particularly useful in applications involving heavier machine tooling, larger linear axes, rotary tables, transfer mechanisms, conveyors requiring accurate positioning, and other machinery where both torque and controlled acceleration are important.

9. Torque Characteristics

The MPL-B560F family provides approximately 26.8 N·m continuous torque and 67.8 N·m peak torque.

Torque Parameter	Value
Model	MPL-B560F-MJ74AA
Continuous torque	26.8 N·m
Peak torque	67.8 N·m
Peak-to-continuous torque ratio	Approximately 2.53:1
Rated output	5.5 kW
Rated speed	3000 RPM

The substantial difference between continuous and peak torque allows the motor to handle short-duration acceleration, deceleration, positioning, and disturbance events without requiring the motor to operate continuously at its maximum torque level.

This is one of the important characteristics that makes the B560F suitable for cyclic machinery. A machine can operate at a moderate continuous torque level while using the higher peak torque capability during acceleration and other demanding portions of the motion profile.

10. Speed Performance

The MPL-B560F is a 3000 RPM servo motor.

Unlike a simple induction motor used primarily for constant-speed operation, a servo motor is normally selected based on its entire motion profile. The important factors include acceleration time, deceleration time, peak torque, continuous torque, positioning frequency, load inertia, and the required speed range.

For this reason, the 3000 RPM rating should not be interpreted as the only operating point. The motor is intended to operate under closed-loop servo control, with the actual speed determined by the drive, command profile, mechanical load, and application requirements.

11. Multi-Turn Absolute Encoder

One of the most important features of the MPL-B560F-MJ74AA is its multi-turn high-resolution absolute encoder.

The encoder provides absolute feedback rather than relying solely on a basic incremental pulse-counting arrangement. Multi-turn capability is especially useful for machines in which the axis may move through multiple revolutions and the control system needs to retain positional information across multiple turns.

This can be valuable in rotary indexing systems, ball-screw-driven linear axes, rotary tables, winding equipment, material-handling machinery, and other applications where the motor shaft can rotate through many revolutions during normal machine operation.

The exact MJ74AA configuration is identified as using multi-turn high-resolution absolute feedback.

12. Advantages of Multi-Turn Feedback

The multi-turn feedback configuration provides several practical advantages.

First, it allows the control system to determine position over multiple motor revolutions rather than treating each revolution as an isolated position range.

Second, it is useful for machine axes driven through gearboxes, pulleys, belts, screws, or other mechanical transmission systems where the motor may rotate many times while the machine mechanism travels through a relatively small physical distance.

Third, absolute feedback can simplify machine recovery after power interruptions because the control system can use stored or communicated position information rather than relying exclusively on a fresh incremental reference sequence.

The practical advantage depends on the complete servo controller and system configuration, but multi-turn feedback is generally a strong choice for demanding positioning applications.

13. Keyed Shaft Configuration

The MPL-B560F-MJ74AA uses a keyed shaft extension.

A keyed shaft provides a positive mechanical interface between the motor shaft and a compatible coupling, pulley, gearbox input, or other driven component.

Mechanical Feature	Specification
Model	MPL-B560F-MJ74AA
Shaft type	Keyed
Shaft configuration	Keyed shaft extension
Main advantage	Positive mechanical torque transmission
Typical use	Couplings, gearboxes, pulleys, mechanical transmission components

A keyed configuration can be especially useful in industrial machinery where the mechanical transmission system is designed around a standard keyed interface.

14. 24 V DC Brake

The MJ74AA configuration includes a 24 V DC brake.

The brake is particularly useful when a machine axis must remain mechanically held when the servo is disabled.

Typical applications include vertical axes, lifting mechanisms, Z-axis machine tools, transfer systems, and other machinery where gravity or an external mechanical force could cause movement when motor torque is removed.

The brake should not automatically be considered the primary dynamic stopping mechanism. In most servo applications, the drive and motor control the normal stopping profile, while the mechanical brake serves primarily as a holding device when the motor is stopped or de-energized.

15. Why the Brake Is Important on Vertical Axes

For a vertical axis, the load may naturally move downward due to gravity.

If the servo is disabled without a mechanical holding mechanism, the load can potentially move unless the machine incorporates another suitable counterbalance or mechanical locking system.

The integrated 24 V DC brake provides a useful additional layer of mechanical holding capability.

For this reason, the MPL-B560F-MJ74AA can be a strong choice for applications in which the corresponding no-brake version would not provide the desired mechanical holding function.

16. Connector Configuration

The motor uses a SpeedTEC DIN connector in a right-angle configuration. The connector can be rotated through 180 degrees.

This can be useful when installing the motor into a machine where cable clearance is limited.

Connector Feature	Specification
Model	MPL-B560F-MJ74AA
Connector family	SpeedTEC DIN
Orientation	Right angle
Rotation	180° rotatable
Connection style	Quick-connect type

Cable routing should still be considered carefully. The connector orientation may improve installation flexibility, but the final cable bend radius, cable tray position, cabinet location, and machine-axis movement must all be considered.

17. Mounting Configuration

The motor uses an IEC metric mounting configuration and free mounting holes identified as Type FF.

This makes the motor appropriate for machine frames designed around metric mounting practices.

When replacing an existing motor, however, the frame diameter alone is not enough to confirm compatibility.

The following should be checked:

• Mounting flange dimensions.
• Bolt-hole pattern.
• Shaft diameter.
• Shaft extension length.
• Key dimensions.
• Pilot diameter.
• Total motor length.
• Connector clearance.
• Brake clearance.
• Cable direction.

A motor can have the same frame size as another motor and still require mechanical modification if these details do not match.

18. Main Product Advantages

The MPL-B560F-MJ74AA has several notable advantages for industrial motion applications.

18.1 5.5 kW Servo Output

The 5.5 kW rating gives the motor enough capacity for demanding industrial axes without moving immediately into the much larger motor sizes.

18.2 26.8 N·m Continuous Torque

The 26.8 N·m continuous torque rating provides substantial sustained mechanical output for repetitive machine cycles.

18.3 67.8 N·m Peak Torque

The high peak torque capability helps with rapid acceleration, deceleration, load disturbances, and short-duration high-torque events.

18.4 3000 RPM Operation

A 3000 RPM rating provides a useful combination of speed and torque for many industrial machine axes.

18.5 Multi-Turn Absolute Feedback

Multi-turn absolute feedback is particularly useful where machine position must be tracked over multiple motor revolutions.

18.6 Keyed Shaft

The keyed shaft provides a conventional positive mechanical connection for many industrial transmission arrangements.

18.7 Integral 24 V DC Brake

The brake makes the motor more suitable for applications requiring mechanical holding, especially vertical-axis machinery.

18.8 Rotatable Right-Angle Connector

The 180° rotatable connector can simplify cable routing in compact machine layouts.

18.9 Low-Inertia Servo Construction

The low-inertia design is intended to support responsive servo motion and controlled dynamic behavior.

19. Typical Applications

The MPL-B560F-MJ74AA can be considered for many types of industrial automation equipment.

Machine Tools

The motor can be used for machine axes requiring controlled positioning, acceleration, and deceleration.

Applications may include feed axes, positioning axes, tool-handling mechanisms, rotary mechanisms, and auxiliary machine movements.

Packaging Machinery

Packaging equipment frequently requires repeated high-speed movements and accurate synchronization.

The motor’s combination of 3000 RPM operation, high peak torque, and absolute feedback makes this type of servo configuration suitable for demanding packaging axes.

Material Handling

Servo motors are widely used for positioning conveyors, transfer mechanisms, indexing units, and automated handling systems.

The B560F’s 26.8 N·m continuous torque provides useful capacity for medium-to-heavy mechanical loads.

Vertical Lifting Axes

The 24 V DC brake is particularly valuable for vertical machine axes where the load must be held when motor torque is removed.

Examples include lifting platforms, vertical slides, Z-axis mechanisms, and certain material-handling systems.

Rotary Indexing Machines

The multi-turn absolute feedback configuration can be useful for rotary positioning mechanisms where accurate angular positioning is required.

Automated Assembly

Automated assembly equipment often requires repeatable movements with precise acceleration and deceleration.

The servo motor can be applied to positioning stages, transfer units, rotary indexing mechanisms, and other motion axes.

Printing and Converting Equipment

Web-handling and converting machinery often requires coordinated motion between multiple axes.

Servo motors with absolute feedback can be used where accurate synchronization and repeatable positioning are important.

Winding and Unwinding Systems

Multi-turn feedback can be beneficial in applications where the motor and driven mechanism rotate through many revolutions.

The exact motor size must still be selected according to web tension, drum diameter, acceleration profile, inertia, and continuous thermal load.

20. Applications Where the MJ74AA Configuration Is Especially Attractive

The MJ74AA version is especially interesting when three characteristics are required simultaneously:

1. Multi-turn absolute feedback.
2. Keyed mechanical shaft.
3. 24 V DC holding brake.

This combination makes it more application-specific than a generic B560F motor.

For example, a vertical servo axis may need the absolute feedback for position control, the keyed shaft for the mechanical transmission, and the brake for holding the load when the axis is stopped.

21. Five Same-Series or Closely Related Models

The following models are useful comparison points when selecting an MPL motor. The exact suffix determines the feedback, shaft, brake, or other configuration.

Model	Rated Speed	Rated Power	Continuous Torque	Peak Torque	Feedback	Shaft	Brake	Frame / Stack
MPL-B560F-MJ72AA	3000 RPM	5.5 kW	26.8 N·m	67.8 N·m	Multi-turn absolute	Keyed	No	165 / 152.4 mm
MPL-B560F-MK72AA	3000 RPM	5.5 kW	26.8 N·m	67.8 N·m	Multi-turn absolute	Keyless	No	165 / 152.4 mm
MPL-B560F-SJ72AA	3000 RPM	5.5 kW	26.8 N·m	67.8 N·m	Single-turn absolute	Keyed	No	165 / 152.4 mm
MPL-B560F-SK74AA	3000 RPM	5.5 kW	26.8 N·m	67.8 N·m	Single-turn absolute	Keyless	24 V DC	165 / 152.4 mm
MPL-B540K-MJ72AA	4000 RPM	5.4 kW	19.4 N·m	48.6 N·m	Multi-turn absolute	Keyed	No	165 / 101.6 mm

The B560F variants share the same basic motor size and performance family, while the suffix changes the feedback, shaft, and brake configuration. The B540K provides a useful alternative when higher speed is more important and somewhat lower torque is acceptable. The B560F, B540K, B580F and related variants are all part of the MPL motor family.

22. Comparison With MPL-B560F-MJ72AA

The MPL-B560F-MJ72AA is one of the closest comparisons to the MJ74AA.

The major difference is the brake configuration.

The MJ74AA includes a 24 V DC brake, while the MJ72AA is the corresponding no-brake configuration.

Parameter	MPL-B560F-MJ74AA	MPL-B560F-MJ72AA
Rated speed	3000 RPM	3000 RPM
Rated power	5.5 kW	5.5 kW
Continuous torque	26.8 N·m	26.8 N·m
Peak torque	67.8 N·m	67.8 N·m
Feedback	Multi-turn absolute	Multi-turn absolute
Shaft	Keyed	Keyed
Brake	24 V DC	No brake
Frame	165 mm	165 mm
Stack	152.4 mm	152.4 mm
Weight reference	Approx. 20.2 kg family size	Approx. 20.2 kg family size

For a horizontal axis where a brake is not required, the MJ72AA may be the simpler configuration.

For a vertical axis or an axis that must be mechanically held when disabled, the MJ74AA provides an important additional feature.

23. Comparison With MPL-B560F-MK72AA

The MK72AA is useful when the machine requires the same general B560F performance but uses a keyless shaft configuration.

Parameter	MPL-B560F-MJ74AA	MPL-B560F-MK72AA
Rated speed	3000 RPM	3000 RPM
Rated power	5.5 kW	5.5 kW
Continuous torque	26.8 N·m	26.8 N·m
Peak torque	67.8 N·m	67.8 N·m
Feedback	Multi-turn absolute	Multi-turn absolute
Shaft	Keyed	Keyless
Brake	24 V DC	No brake
Frame	165 mm	165 mm
Stack	152.4 mm	152.4 mm

The decision between keyed and keyless configurations should normally follow the mechanical coupling design of the machine.

24. Comparison With MPL-B560F-SJ72AA

The SJ72AA provides another useful comparison because it changes the feedback configuration from multi-turn to single-turn.

Parameter	MPL-B560F-MJ74AA	MPL-B560F-SJ72AA
Rated speed	3000 RPM	3000 RPM
Rated power	5.5 kW	5.5 kW
Continuous torque	26.8 N·m	26.8 N·m
Peak torque	67.8 N·m	67.8 N·m
Feedback	Multi-turn absolute	Single-turn absolute
Shaft	Keyed	Keyed
Brake	24 V DC	No brake
Frame	165 mm	165 mm
Stack	152.4 mm	152.4 mm

If the application requires absolute position information over multiple motor revolutions, the multi-turn configuration is generally the more appropriate choice.

25. Comparison With MPL-B580F-MJ72AA

The B580F is a step upward in torque capacity.

Parameter	MPL-B560F-MJ74AA	MPL-B580F-MJ72AA
Rated speed	3000 RPM	3000 RPM
Rated power	5.5 kW	7.1 kW
Continuous torque	26.8 N·m	34.0 N·m
Peak torque	67.8 N·m	87.0 N·m
Feedback	Multi-turn absolute	Multi-turn absolute
Frame	165 mm	165 mm
Stack	152.4 mm	203.2 mm
Weight reference	Approx. 20.2 kg	Approx. 25.4 kg

The B580F should be considered when the B560F does not provide enough continuous or peak torque capacity. Its longer stack and greater weight should also be considered during mechanical design.

26. Five Popular Models From the Same Brand

The following five models provide a useful selection range from smaller to larger MPL servo motor sizes.

Model	Rated Speed	Rated Power	Continuous Torque	Peak Torque	Rotor Inertia	Weight	Frame / Stack
MPL-B520K	4000 RPM	3.5 kW	10.7 N·m	23.2 N·m	0.000783 kg·m²	9.8 kg	165 / 50.8 mm
MPL-B540D	2000 RPM	3.4 kW	19.4 N·m	41.0 N·m	0.00147 kg·m²	15.0 kg	165 / 101.6 mm
MPL-B540K	4000 RPM	5.4 kW	19.4 N·m	48.6 N·m	0.00147 kg·m²	Approx. 15 kg	165 / 101.6 mm
MPL-B560F	3000 RPM	5.5 kW	26.8 N·m	67.8 N·m	0.00213 kg·m²	20.2 kg	165 / 152.4 mm
MPL-B580F	3000 RPM	7.1 kW	34.0 N·m	87.0 N·m	0.00289 kg·m²	25.4 kg	165 / 203.2 mm

The published technical data shows a clear progression through the MPL family: the B520K provides a smaller, higher-speed option; the B540 models provide intermediate torque and power; the B560F increases continuous and peak torque; and the B580F moves into a higher-power and higher-torque range.

27. MPL-B520K

The MPL-B520K is a more compact option within this group.

Its 3.5 kW output, 10.7 N·m continuous torque, and 23.2 N·m peak torque make it appropriate for applications with lower mechanical load requirements than the B560F.

Its 4000 RPM rating also makes it attractive when higher speed is more important than high continuous torque. The listed rotor inertia is approximately 0.000783 kg·m² and the weight is approximately 9.8 kg.

28. MPL-B540D

The MPL-B540D is rated at approximately 2000 RPM and 3.4 kW.

It provides 19.4 N·m continuous torque and 41.0 N·m peak torque, with approximately 15 kg listed weight.

This model can be useful when the application favors lower operating speed and moderate torque rather than the 3000–4000 RPM range of some other MPL models.

29. MPL-B540K

The MPL-B540K provides approximately 5.4 kW and 4000 RPM, with 19.4 N·m continuous torque and 48.6 N·m peak torque.

It is an interesting alternative to the B560F when higher speed is more important than maximum torque.

The B560F provides substantially more continuous and peak torque, while the B540K provides a higher rated speed. This makes the choice strongly dependent on the machine’s speed-torque operating envelope.

30. MPL-B580F

The MPL-B580F increases the rated output to approximately 7.1 kW.

It provides approximately 34.0 N·m continuous torque and 87.0 N·m peak torque.

Compared with the B560F, it offers greater torque and power but also uses a longer 203.2 mm stack and has a higher listed weight of approximately 25.4 kg.

31. B560F Versus B540K

The B560F and B540K are often interesting alternatives.

Parameter	MPL-B560F	MPL-B540K
Rated speed	3000 RPM	4000 RPM
Rated power	5.5 kW	5.4 kW
Continuous torque	26.8 N·m	19.4 N·m
Peak torque	67.8 N·m	48.6 N·m
Frame	165 mm	165 mm
Stack	152.4 mm	101.6 mm
Rotor inertia	0.00213 kg·m²	0.00147 kg·m²
Weight	20.2 kg	Approx. 15 kg

If the machine requires higher torque and stronger acceleration capability, the B560F is generally the stronger choice.

If the machine requires higher rotational speed and lower motor inertia, the B540K may be more attractive.

32. B560F Versus B580F

Parameter	MPL-B560F	MPL-B580F
Rated speed	3000 RPM	3000 RPM
Rated power	5.5 kW	7.1 kW
Continuous torque	26.8 N·m	34.0 N·m
Peak torque	67.8 N·m	87.0 N·m
Stack	152.4 mm	203.2 mm
Rotor inertia	0.00213 kg·m²	0.00289 kg·m²
Weight	20.2 kg	25.4 kg

The B580F is the better choice when the machine genuinely requires the additional torque and power.

The B560F can be preferable when the B580F would provide unnecessary capacity and the additional motor size and weight are undesirable.

33. Servo Drive Compatibility

MPL motors are intended to operate as part of a complete servo system rather than as standalone motors.

The B560F family appears in technical performance documentation for several motion-control platforms, including 400 V-class drive configurations.

When selecting a replacement drive, the motor’s:

• Voltage class.
• Rated current.
• Continuous torque.
• Peak torque.
• Feedback type.
• Feedback protocol.
• Brake requirements.
• Cable configuration.
• Motor identification parameters.

must all be checked against the drive.

34. Feedback and Drive Matching

The multi-turn absolute encoder is one of the most important aspects of the MJ74AA configuration.

A drive that cannot correctly support the motor’s feedback architecture should not be treated as a drop-in replacement simply because its output power appears to be similar.

The correct drive setup must recognize the motor feedback and apply the appropriate motor identification and tuning parameters.

35. Mechanical Installation Considerations

Before installing the MPL-B560F-MJ74AA, the machine designer or maintenance engineer should check the following.

Mounting

Confirm the flange and mounting-hole arrangement.

Shaft

Confirm shaft diameter, key dimensions, shaft extension, and coupling requirements.

Clearance

Allow sufficient room around the connector and cable.

Brake

Confirm that the machine’s brake control circuit supplies the correct brake voltage and follows the required brake timing sequence.

Cable Routing

Avoid excessive bending, pulling, or twisting of motor cables.

Cooling

Maintain adequate airflow and avoid enclosing the motor in a way that prevents normal heat dissipation.

36. Coupling Selection

The keyed shaft means the coupling must be compatible with the motor shaft geometry.

A good coupling should provide suitable torque capacity while controlling angular and parallel misalignment.

An undersized coupling can introduce vibration, backlash, mechanical wear, or shaft loading.

For precision servo applications, the coupling should be selected according to the actual torque, speed, acceleration, inertia, and alignment requirements rather than simply matching the motor’s nominal shaft diameter.

37. Load Inertia

The B560F family has a listed rotor inertia of approximately 0.00213 kg·m².

Rotor inertia is important because servo performance is not determined by motor torque alone.

A machine with a large reflected load inertia may require more acceleration torque and may be more difficult to tune.

The mechanical transmission ratio should therefore be considered when calculating the load inertia reflected to the motor shaft.

38. Acceleration and Deceleration

The 67.8 N·m peak torque rating gives the motor considerable short-duration torque capacity.

This is useful for:

• Rapid acceleration.
• Rapid deceleration.
• Indexing.
• Position correction.
• Load disturbance response.
• Short-cycle machinery.

However, peak torque should not be treated as a continuous operating point.

Continuous thermal loading should be evaluated against the actual machine duty cycle.

39. Vertical-Axis Applications

The integrated 24 V DC brake makes the MJ74AA particularly interesting for vertical-axis applications.

Typical examples include:

• Vertical slides.
• Lift mechanisms.
• Z-axis positioning.
• Automated handling lifts.
• Vertical transfer systems.
• Certain robotic mechanisms.

The brake should be correctly controlled so that the motor does not fight a mechanically engaged brake during normal operation.

Proper brake timing is important for both motor life and machine safety.

40. Horizontal-Axis Applications

The MJ74AA can also be used on horizontal axes.

In such applications, the brake may provide additional holding capability even though gravity does not normally create the same downward force found on a vertical axis.

For a purely horizontal application, however, a no-brake variant may sometimes be preferable if the machine does not need mechanical holding.

41. Maintenance Considerations

Routine maintenance should focus on the complete servo system rather than the motor alone.

Important inspection points include:

• Motor mounting bolts.
• Coupling condition.
• Shaft alignment.
• Cable condition.
• Connector condition.
• Brake operation.
• Excessive vibration.
• Unusual motor temperature.
• Encoder-related faults.
• Servo following error.
• Abnormal mechanical noise.
• Gearbox or transmission condition.

A servo motor can appear to have an electrical problem when the actual problem is mechanical backlash, coupling wear, bearing loading, misalignment, or an improperly balanced load.

42. Replacement Checklist

When replacing an existing MPL-B560F-MJ74AA, verify the following before ordering.

Check Item	Requirement
Model	MPL-B560F-MJ74AA
Voltage	460 V
Rated speed	3000 RPM
Power	5.5 kW
Continuous torque	26.8 N·m
Peak torque	67.8 N·m
Frame	165 mm
Stack	152.4 mm
Feedback	Multi-turn absolute
Shaft	Keyed
Brake	24 V DC
Connector	SpeedTEC DIN right-angle
Mounting	IEC metric
Weight reference	Approx. 20.2 kg
Mechanical drawing	Verify before installation
Cable configuration	Verify separately
Drive compatibility	Verify feedback and electrical parameters

This checklist is especially important when replacing an older motor with a similar-looking model. The suffix is not simply a marketing designation; it can represent meaningful differences in shaft, brake, feedback, and connector configuration.

43. Why the Exact Suffix Matters

The B560F designation identifies the basic motor size and performance family, but the complete catalog number provides much more information.

For example, the difference between an MJ72AA and an MJ74AA can determine whether the motor has a brake.

Similarly, the difference between an M configuration and an S configuration can determine whether the feedback arrangement is multi-turn or single-turn.

The difference between J and K configurations can identify different shaft arrangements.

Therefore, ordering only by “B560F” is not recommended when a machine requires an exact replacement.

44. Practical Machine Selection

The MPL-B560F-MJ74AA is most attractive when the machine needs a combination of:

5.5 kW output + 3000 RPM + 26.8 N·m continuous torque + 67.8 N·m peak torque + multi-turn absolute feedback + keyed shaft + 24 V brake.

This combination makes it a relatively specialized servo motor rather than simply a general-purpose 5.5 kW motor.

45. Advantages at a Glance

Advantage	Practical Benefit
Multi-turn absolute feedback	Useful for multi-revolution positioning
5.5 kW output	Suitable for substantial machine loads
26.8 N·m continuous torque	Strong sustained torque capability
67.8 N·m peak torque	Supports demanding acceleration and short-duration loads
3000 RPM	Good balance between speed and torque
24 V DC brake	Useful for holding loads when disabled
Keyed shaft	Positive mechanical torque transmission
165 mm frame	Standardized industrial mechanical size
152.4 mm stack	Provides the B560F torque class
Right-angle rotatable connector	Flexible cable installation
Low-inertia design	Responsive servo motion
IEC metric mounting	Suitable for metric machine construction

46. Recommended Same-Series Models

For a machine requiring the same general B560F platform, the following five models are worth considering.

Recommended Model	Main Difference	Typical Reason to Choose
MPL-B560F-MJ72AA	No brake	Horizontal axes or applications without holding-brake requirements
MPL-B560F-MK72AA	Keyless shaft, no brake	Machines using a keyless coupling arrangement
MPL-B560F-SJ72AA	Single-turn feedback, keyed	Applications that do not require multi-turn feedback
MPL-B560F-SK74AA	Single-turn, keyless, brake	Applications requiring a brake but a keyless shaft
MPL-B540K-MJ72AA	Higher speed, shorter stack	Applications prioritizing 4000 RPM operation

The B560F alternatives are useful when the basic motor capacity is correct but the machine requires a different feedback, shaft, or brake configuration.

47. Recommended Same-Brand Models

For broader selection, the following five models provide a useful range.

Model	Power	Speed	Continuous Torque	Peak Torque	Weight
MPL-B520K	3.5 kW	4000 RPM	10.7 N·m	23.2 N·m	9.8 kg
MPL-B540D	3.4 kW	2000 RPM	19.4 N·m	41.0 N·m	15.0 kg
MPL-B540K	5.4 kW	4000 RPM	19.4 N·m	48.6 N·m	Approx. 15 kg
MPL-B560F	5.5 kW	3000 RPM	26.8 N·m	67.8 N·m	20.2 kg
MPL-B580F	7.1 kW	3000 RPM	34.0 N·m	87.0 N·m	25.4 kg

These models form a practical progression from lower-power/high-speed applications through medium-torque servo applications and into higher-power, higher-torque machine axes.

48. Complete Specification Summary

Specification	MPL-B560F-MJ74AA
Brand	Allen-Bradley
Product family	MPL
Product type	Low-inertia brushless rotary servo motor
Voltage	460 V
Voltage class	400 V-class
Frame size	165 mm
Frame size in inches	6.50 in
Magnet stack	152.4 mm
Stack length in inches	6.0 in
Rated speed	3000 RPM
Maximum listed speed	3000 RPM
Rated power	5.5 kW
Continuous torque	26.8 N·m
Peak torque	67.8 N·m
Feedback	Multi-turn high-resolution absolute encoder
Shaft	Keyed shaft extension
Brake	24 V DC
Connector	SpeedTEC DIN
Connector orientation	Right angle
Connector rotation	180°
Mounting	IEC metric
Mounting holes	Free mounting holes, Type FF
Rotor inertia	Approx. 0.00213 kg·m², B560F family reference
Weight	Approx. 20.2 kg, B560F family reference
Overall dimensions	Confirm exact L × W × H from mechanical drawing
Application class	Industrial servo motion
Main strengths	Torque, speed, absolute feedback, brake, keyed shaft
Typical machine use	Positioning, automation, material handling, machine tools, packaging, vertical axes

49. Key Specifications at a Glance

For quick selection, the most important figures are:

Model: MPL-B560F-MJ74AA

Brand: Allen-Bradley

Series: MPL Low-Inertia Brushless Servo Motors

Voltage: 460 V

Frame: 165 mm

Stack: 152.4 mm

Rated speed: 3000 RPM

Rated power: 5.5 kW

Continuous torque: 26.8 N·m

Peak torque: 67.8 N·m

Feedback: Multi-turn high-resolution absolute encoder

Shaft: Keyed

Brake: 24 V DC

Connector: Right-angle SpeedTEC DIN, 180° rotatable

Weight: Approximately 20.2 kg family reference

Rotor inertia: Approximately 0.00213 kg·m² family reference

50. Overall Product Assessment

The MPL-B560F-MJ74AA is a strong choice for industrial servo applications that require more than basic positioning capability.

Its combination of 5.5 kW rated power, 26.8 N·m continuous torque, 67.8 N·m peak torque, 3000 RPM speed, multi-turn absolute feedback, keyed shaft, and 24 V DC brake makes it particularly suitable for machinery that requires both dynamic servo performance and mechanical holding capability.

The multi-turn absolute encoder is a major advantage for machine axes that travel through multiple motor revolutions. The keyed shaft is well suited to conventional industrial mechanical transmissions, while the integral 24 V DC brake provides an important holding function for vertical and other mechanically demanding axes.

The B560F motor size also occupies a useful position within the broader MPL family. Compared with the B540K, it offers substantially greater torque, while the B580F provides another step upward when higher power and torque are required. The published family data places the B560F at 5.5 kW, 26.8 N·m continuous torque, 67.8 N·m peak torque, and approximately 20.2 kg, making it a substantial but still manageable industrial servo motor size.

From a replacement standpoint, the most important point is that the complete catalog number should be matched rather than selecting only the B560F family designation. The MJ74AA configuration specifically brings together multi-turn absolute feedback, keyed shaft construction, and a 24 V DC brake.

For a machine where accurate positioning, repeated acceleration and deceleration, multi-turn position information, and reliable load holding are all important, the MPL-B560F-MJ74AA represents a well-balanced servo motor configuration.