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Allen-Bradley MPL-B310P-SK74AA Servo Motor

1. Product Overview

The Allen-Bradley MPL-B310P-SK74AA is a low-inertia brushless AC rotary servo motor designed for industrial motion-control equipment that requires accurate positioning, controlled speed, rapid acceleration and deceleration, and repeatable machine movement.

It belongs to the MP-Series MPL low-inertia servo motor family and uses a 460 V AC class configuration. The motor has a 100 mm frame, 25.4 mm magnet stack, 5000 rpm speed rating, single-turn high-resolution encoder, keyless shaft extension, and an integrated 24 V DC holding brake.

The SK74AA configuration is particularly useful when a machine requires a keyless shaft together with a motor-mounted holding brake. This makes it different from the closely related SK72AA version, which uses the same general motor configuration but does not include the brake.

The motor is intended to operate as part of a complete servo axis. In a typical installation, the motor works together with a compatible servo drive, motion controller, feedback interface, motor cable, mechanical transmission, and machine load.

The low-inertia construction is well suited to machines that perform frequent positioning movements. Applications involving indexing, feeding, packaging, assembly, rotary positioning, and synchronized machine motion can benefit from a motor configuration designed for dynamic response.

The integrated 24 V DC brake is another important characteristic. It can be used to hold the motor shaft when active servo torque is removed, making the configuration particularly useful for selected vertical, lifting, positioning, and gravity-loaded mechanisms.

The motor uses a right-angle SpeedTEC DIN connector with 180-degree rotation capability. This arrangement provides additional flexibility when the motor is installed inside machinery where space around the rear connector is limited.

2. Basic Product Parameters

Parameter	Specification
Model	MPL-B310P-SK74AA
Brand	Allen-Bradley
Product Family	MP-Series
Product Series	MPL Low-Inertia Servo Motors
Product Type	Brushless AC Rotary Servo Motor
Voltage Class	460 V AC / 480 V class
Frame Size	Frame 3
Frame Dimension	100 mm
Magnet Stack Length	25.4 mm
Rated Speed	5000 rpm
Continuous Torque	Approximately 1.58 Nm
Peak Torque	Approximately 3.61 Nm
Continuous Rated Power	Approximately 0.77 kW
Feedback	Single-turn high-resolution encoder
Feedback Resolution	1024 Sin/Cos cycles per revolution
Feedback Protocol	Hiperface
Shaft	Keyless shaft extension
Shaft Seal	No shaft seal
Brake	24 V DC holding brake
Connector	SpeedTEC DIN connector
Connector Style	Right-angle
Connector Rotation	180° rotatable
Mounting	IEC metric flange
Mounting Holes	Free mounting holes / Type FF
Frame Dimension	100 mm
Magnet Stack Dimension	25.4 mm
Reference Weight	Approximately 3.63 kg
Overall Dimensions	Complete envelope to be checked against mechanical drawing

The 100 mm frame and 25.4 mm magnet stack are the main dimensional identifiers of the B310P configuration. The exact complete motor envelope should be checked against the mechanical drawing when designing a machine or replacing an existing motor.

The weight can vary between published catalog and distributor records depending on configuration and whether the brake assembly is included in the stated shipping or product weight. For engineering work, approximately 3.63 kg should be treated as a reference value for the brake-equipped configuration rather than as a substitute for the exact product drawing or packing specification.

3. Brand

Brand: Allen-Bradley

The MPL-B310P-SK74AA is an Allen-Bradley servo motor designed for industrial automation and motion-control systems.

For identification purposes, the complete catalog number is important. The individual characters in the model number identify major characteristics such as voltage class, frame size, magnet stack, speed, feedback, shaft configuration, connector arrangement, and brake option.

This is especially important when replacing an existing servo motor because two motors can have the same frame size and speed while using different shaft or feedback configurations.

4. Product Series

Series: MP-Series MPL Low-Inertia Servo Motors

The MPL series is a family of brushless AC rotary servo motors developed for industrial motion-control applications.

The series is characterized by low-inertia motor construction, high-speed operating configurations, feedback options, and different mechanical configurations.

The MPL-B310P-SK74AA belongs to the B310P configuration group.

The B310P designation identifies a motor using a 100 mm frame, 25.4 mm magnet stack, and 5000 rpm configuration.

The SK74AA suffix then identifies the specific combination of single-turn high-resolution feedback, keyless shaft, and 24 V DC brake.

5. Product Type

The MPL-B310P-SK74AA is a:

Low-Inertia Brushless AC Rotary Servo Motor

It is not intended to operate as a conventional fixed-speed industrial motor.

A servo motor is part of a closed-loop motion system. The drive regulates current and torque while receiving position and speed information from the motor feedback device.

This allows the machine to control movement much more precisely than a basic motor operating without closed-loop feedback.

6. Model Number Explanation

The model number MPL-B310P-SK74AA can be broken down into several configuration sections.

Model Code	Configuration Meaning
MPL	MPL low-inertia brushless servo motor family
B	460 V class
3	Frame size 3 / 100 mm
10	Magnet stack 10 / 25.4 mm
P	5000 rpm configuration
S	Single-turn high-resolution encoder
K	Keyless shaft extension
7	SpeedTEC DIN connector configuration
4	24 V DC brake
AA	Catalog configuration

This model coding structure is useful for understanding the difference between closely related motors.

For example, the difference between SK72AA and SK74AA is primarily the brake configuration.

The SK72AA is a keyless-shaft, no-brake configuration, while the SK74AA is a keyless-shaft configuration with a 24 V DC holding brake.

7. Detailed Technical Specifications

Technical Parameter	Specification
Model	MPL-B310P-SK74AA
Motor Type	Low-inertia brushless AC servo motor
Voltage	460 V AC
Voltage Class	400/460 V class
Frame Code	3
Frame Size	100 mm
Magnet Stack Code	10
Magnet Stack	25.4 mm
Speed Code	P
Rated Speed	5000 rpm
Feedback Code	S
Feedback Type	Single-turn high-resolution encoder
Feedback Resolution	1024 Sin/Cos cycles/rev
Feedback Protocol	Hiperface
Shaft Code	K
Shaft Type	Keyless
Brake Code	4
Brake Type	24 V DC holding brake
Continuous Torque	Approximately 1.58 Nm
Peak Torque	Approximately 3.61 Nm
Continuous Rated Power	Approximately 0.77 kW
Rotor Inertia	Approximately 4.4 × 10⁻⁵ kg·m² class
Connector	SpeedTEC DIN
Connector Configuration	Right-angle
Connector Rotation	180°
Mounting	IEC metric
Mounting Holes	Free mounting holes / Type FF
Shaft Seal	No shaft seal
Frame Dimension	100 mm
Stack Dimension	25.4 mm
Reference Weight	Approximately 3.63 kg
Complete Motor Dimensions	Refer to exact mechanical drawing

8. Encoder and Feedback System

The MPL-B310P-SK74AA uses a single-turn high-resolution encoder.

The feedback system is an important part of the motor because the servo drive uses the feedback information to determine the actual motor position and movement.

The listed feedback configuration uses 1024 Sin/Cos cycles per revolution and a Hiperface feedback protocol.

During operation, the motion-control system can compare commanded movement with actual motor movement. This closed-loop arrangement allows the machine to correct positioning errors and regulate the motor accurately.

This type of feedback is useful for applications where the motor must repeatedly move to defined positions or maintain synchronized motion with other machine axes.

9. Single-Turn Feedback

The encoder is a single-turn configuration.

Single-turn feedback provides detailed position information within one mechanical revolution of the motor shaft.

This is useful for many conventional servo applications involving rotary positioning, indexing, synchronization, and controlled acceleration.

The complete machine behavior after power interruption depends on the overall control architecture, controller configuration, homing requirements, and how the machine uses the feedback information.

10. Keyless Shaft Configuration

One of the most important mechanical characteristics of the MPL-B310P-SK74AA is its keyless shaft.

Unlike a keyed shaft, a keyless shaft does not use a conventional shaft key to transmit torque.

Instead, the shaft is normally connected to a suitable clamping hub, friction-locking coupling, or compatible mechanical transmission component.

This can be advantageous where the machine has been specifically designed around a keyless mechanical connection.

It can also provide a clean shaft interface and allow the mechanical designer to select a suitable coupling according to the machine’s torque and speed requirements.

However, the shaft connection must be checked carefully when replacing the motor.

A keyed version and a keyless version may have the same frame, stack, speed, and electrical characteristics while still requiring different mechanical transmission components.

11. 24 V DC Holding Brake

The MPL-B310P-SK74AA includes a 24 V DC holding brake.

This is one of the main differences between the SK74AA and SK72AA versions.

The holding brake is designed to hold the motor shaft when active servo torque is not being used to maintain position.

This feature is particularly useful for applications such as:

• Vertical axes.
• Lifting mechanisms.
• Gravity-loaded mechanisms.
• Positioning systems.
• Holding mechanisms.
• Automated equipment where shaft movement must be limited after power removal.

The brake should be regarded as a holding function and should not automatically be treated as the complete safety stopping system for a machine.

The machine designer should evaluate the load, stopping requirements, safety architecture, brake timing, and mechanical holding requirements separately.

12. 100 mm Frame

The motor uses a 100 mm frame size.

Frame size is one of the primary mechanical dimensions used when selecting a servo motor.

It affects mounting compatibility, flange arrangement, shaft position, and the general size of the motor.

The 100 mm frame makes the MPL-B310P-SK74AA suitable for many compact industrial machine axes.

However, the 100 mm frame should not be interpreted as the complete motor width, height, or length.

The actual motor envelope includes the flange, shaft extension, connector, brake assembly, and body length.

13. 25.4 mm Magnet Stack

The motor uses a 25.4 mm magnet stack.

The stack length is represented by the “10” section of the B310P model number.

The magnet stack affects the electromagnetic characteristics of the motor and is therefore an important parameter when comparing motors within the same frame family.

A motor with the same 100 mm frame but a different stack length should not automatically be considered a direct replacement.

14. 5000 RPM Operating Speed

The MPL-B310P-SK74AA is configured for 5000 rpm.

This high-speed configuration is useful for machines that require rapid rotary movement or short cycle times.

High-speed servo operation can also allow the machine designer to use suitable gear reduction, belt transmission, or other mechanical transmission methods to obtain the required output torque and speed.

The actual operating point should always be determined from the machine load, torque requirement, acceleration profile, thermal conditions, duty cycle, and servo-drive configuration.

15. Torque and Power Characteristics

The MPL-B310P-SK74AA is generally associated with approximately 1.58 Nm continuous torque, approximately 3.61 Nm peak torque, and approximately 0.77 kW continuous rated power for the B310P configuration.

Continuous torque is important for determining the motor’s ability to operate under the normal machine load.

Peak torque becomes important during acceleration, deceleration, indexing, rapid positioning, and temporary load changes.

For proper servo sizing, the complete motion cycle should be considered rather than selecting the motor only from its continuous power rating.

16. Rotor Inertia

Rotor inertia is an important specification for a low-inertia servo motor.

The MPL-B310P-SK74AA is associated with a rotor inertia in the approximately 4.4 × 10⁻⁵ kg·m² class.

Low motor inertia is useful in applications where the motor must repeatedly change speed.

The motor does not have to spend as much torque overcoming its own rotational inertia, leaving more of the available motor torque for accelerating the connected machine load.

The actual servo response, however, depends on the total reflected inertia of the machine.

The inertia of gears, belts, couplings, screws, rollers, and other mechanical components should be included when evaluating the complete system.

17. Dimensions and Weight

The principal dimensional identifiers are:

Frame: 100 mm

Magnet stack: 25.4 mm

A reference weight of approximately 3.63 kg is associated with the brake-equipped configuration in some technical listings.

Because published weight figures can vary depending on the measurement basis and configuration, the actual product weight should be verified against the exact motor documentation when weight is critical to machine design.

Mechanical Parameter	Specification
Model	MPL-B310P-SK74AA
Frame Size	100 mm
Frame Classification	Frame 3
Magnet Stack	25.4 mm
Mounting Standard	IEC metric
Mounting Hole Type	Free mounting holes / Type FF
Shaft	Keyless shaft extension
Shaft Seal	No shaft seal
Brake	24 V DC holding brake
Connector	Right-angle SpeedTEC DIN
Connector Rotation	180°
Reference Weight	Approximately 3.63 kg
Frame Dimension	100 mm
Stack Dimension	25.4 mm
Complete Motor Envelope	Verify exact mechanical drawing

18. Electrical Parameters

Electrical Parameter	Specification
Model	MPL-B310P-SK74AA
Armature Voltage	460 V
Voltage Class	400/460 V
Motor Type	Brushless AC servo
Rated Speed	5000 rpm
Continuous Torque	Approx. 1.58 Nm
Peak Torque	Approx. 3.61 Nm
Continuous Power	Approx. 0.77 kW
Feedback Type	Single-turn high-resolution encoder
Feedback Resolution	1024 Sin/Cos cycles/rev
Feedback Protocol	Hiperface
Brake	24 V DC
Brake Function	Holding brake
Connector	SpeedTEC DIN
Connector Position	Right-angle
Connector Rotation	180°
Frame	100 mm
Stack	25.4 mm
Approx. Weight	3.63 kg reference
Dimensions	100 mm frame / 25.4 mm stack

19. Mechanical Parameters

Mechanical Parameter	Specification
Model	MPL-B310P-SK74AA
Motor Construction	Low-inertia brushless servo
Frame Size	100 mm
Magnet Stack	25.4 mm
Shaft Type	Keyless
Shaft Seal	No shaft seal
Mounting	IEC metric
Mounting Hole Configuration	Free mounting holes / Type FF
Brake	24 V DC holding brake
Connector	SpeedTEC DIN
Connector Style	Right-angle
Connector Rotation	180°
Rated Speed	5000 rpm
Approx. Weight	3.63 kg reference
Frame Dimension	100 mm
Stack Dimension	25.4 mm
Overall Dimensions	Check exact mechanical drawing

20. Connector Configuration

The MPL-B310P-SK74AA uses a SpeedTEC DIN connector in a right-angle configuration.

The connector is designed to provide a compact connection arrangement at the rear of the motor.

The connector can be rotated through approximately 180 degrees, giving the installer flexibility when routing motor and feedback cables.

This feature is useful in compact machine layouts where a fixed connector position could interfere with the machine frame, guarding, cable carrier, or adjacent components.

21. Product Applications

Packaging Machinery

The MPL-B310P-SK74AA is well suited to servo-controlled packaging machinery where accurate and repeatable motion is required.

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

The 5000 rpm motor configuration can support high-cycle packaging equipment when the load and transmission are correctly matched.

The holding brake can also be useful in selected machine axes where the shaft needs to remain held while the machine is stopped.

Automated Assembly Equipment

Automated assembly systems often use servo motors for controlled positioning.

The MPL-B310P-SK74AA can be used for indexing tables, rotary positioning, component feeders, transfer mechanisms, insertion equipment, and other automated machine movements.

The high-resolution feedback system provides the control system with detailed motor-position information.

Material Handling

Material-handling machinery can use servo motors for controlled movement of conveyors, transfer mechanisms, rollers, positioning units, and indexing equipment.

The integrated brake can be useful where the machine axis needs a holding function.

For vertical or suspended loads, the complete mechanical and safety design should be evaluated before selecting this motor.

Printing Equipment

Printing and converting machinery can require accurate synchronization between multiple rotary axes.

Servo motors can be used for rollers, feeders, indexing mechanisms, positioning systems, and synchronized motion.

The combination of 5000 rpm speed capability and high-resolution feedback can support demanding rotary motion applications.

Labeling Machinery

Labeling machines often require accurate product positioning and rapid cyclic movement.

The MPL-B310P-SK74AA can be considered for feeder systems, label positioning, indexing mechanisms, and synchronized rotary components.

Machine Tools

The motor can be applied to selected machine-tool auxiliary axes and automated positioning mechanisms.

Potential applications include automated feeders, rotary positioning systems, tool-handling mechanisms, auxiliary axes, and other controlled movements.

The exact motor size should be determined from the required torque, speed, inertia, and duty cycle.

Inspection Equipment

Automated inspection equipment often requires precise movement between inspection points.

The motor can be used for rotary positioning tables, indexing mechanisms, inspection fixtures, and controlled machine axes.

Production Lines

The MPL-B310P-SK74AA can also be used in automated production machinery where repeated motion, controlled acceleration, positioning, and synchronized operation are required.

Typical applications include automated workstations, transfer mechanisms, feeders, indexing stations, and production equipment.

22. Main Product Advantages

Low-Inertia Construction

The MPL series is designed around low-inertia servo motor construction.

This is beneficial for machines that frequently accelerate, decelerate, reverse direction, or perform short positioning movements.

The lower motor inertia can contribute to a responsive servo axis when the mechanical load is correctly matched.

5000 RPM Speed

The 5000 rpm configuration provides a relatively high motor speed for compact industrial motion systems.

This can be useful in applications where short machine cycles and rapid rotary movement are important.

High-Resolution Feedback

The single-turn high-resolution encoder provides detailed position feedback.

The listed 1024 Sin/Cos cycles per revolution and Hiperface feedback arrangement support closed-loop servo control.

Keyless Shaft

The keyless shaft is useful for mechanical systems designed around clamping hubs or friction-locking couplings.

It provides a different mechanical interface from the keyed versions of the same motor family.

For machine replacement work, this characteristic should be checked carefully because a keyed replacement is not necessarily mechanically interchangeable.

Integrated 24 V DC Brake

The integrated 24 V DC holding brake is one of the most useful features of the SK74AA configuration.

It can provide shaft-holding capability when the servo motor is not actively generating torque.

This can be particularly useful for selected vertical axes and positioning mechanisms.

Compact 100 mm Frame

The 100 mm frame provides a relatively compact mechanical package.

This can be useful where machine space is limited but servo-controlled movement is still required.

Flexible Connector Orientation

The 180-degree rotatable right-angle connector gives additional flexibility during machine installation.

This can simplify cable routing and reduce interference with nearby machine components.

23. Advantages of the SK74AA Configuration

The SK74AA version can be understood as a combination of several useful features.

It combines:

• 100 mm frame.
• 25.4 mm magnet stack.
• 5000 rpm speed.
• Single-turn high-resolution feedback.
• Keyless shaft.
• 24 V DC holding brake.
• Right-angle SpeedTEC DIN connector.
• IEC metric mounting.

This combination makes the motor useful when the machine requires both a keyless mechanical shaft interface and an integrated holding brake.

24. Comparison with the SK72AA

The MPL-B310P-SK72AA and MPL-B310P-SK74AA are very closely related.

Parameter	MPL-B310P-SK72AA	MPL-B310P-SK74AA
Product Family	MPL	MPL
Frame	100 mm	100 mm
Magnet Stack	25.4 mm	25.4 mm
Speed	5000 rpm	5000 rpm
Feedback	Single-turn high-resolution	Single-turn high-resolution
Shaft	Keyless	Keyless
Brake	No brake	24 V DC brake
Connector	SpeedTEC DIN	SpeedTEC DIN
Connector Style	Right-angle	Right-angle
Main Dimensions	100 mm / 25.4 mm	100 mm / 25.4 mm
Reference Weight	Approx. 2.68 kg	Approx. 3.63 kg
Main Difference	No brake	Integrated 24 V DC brake

The major functional difference is the holding brake.

This is an important consideration when selecting a replacement because the brake affects both machine operation and the electrical installation.

25. Comparison with the SJ74AA

The SK74AA is also closely related to the MPL-B310P-SJ74AA.

Parameter	MPL-B310P-SK74AA	MPL-B310P-SJ74AA
Frame	100 mm	100 mm
Magnet Stack	25.4 mm	25.4 mm
Speed	5000 rpm	5000 rpm
Feedback	Single-turn high-resolution	Single-turn high-resolution
Shaft	Keyless	Keyed
Brake	24 V DC	24 V DC
Connector	SpeedTEC DIN	SpeedTEC DIN
Motor Type	Low-inertia servo	Low-inertia servo
Dimensions	100 mm / 25.4 mm	100 mm / 25.4 mm
Reference Weight	Approx. 3.63 kg	Approx. brake-equipped configuration
Main Difference	Keyless shaft	Keyed shaft

The principal difference is the shaft.

If the existing machine uses a clamping or keyless coupling, the SK74AA configuration may be mechanically different from a keyed-shaft replacement even though the frame and electrical characteristics are similar.

26. Five Related Models in the Same Series

The following five models are closely related to the MPL-B310P-SK74AA.

Model	Feedback	Shaft	Brake	Speed	Frame / Stack	Reference Weight	Dimensions
MPL-B310P-SK72AA	Single-turn high-resolution	Keyless	No brake	5000 rpm	100 mm / 25.4 mm	Approx. 2.68 kg	100 mm / 25.4 mm
MPL-B310P-SJ74AA	Single-turn high-resolution	Keyed	24 V DC	5000 rpm	100 mm / 25.4 mm	Approx. 5.44 kg class	100 mm / 25.4 mm
MPL-B310P-SJ72AA	Single-turn high-resolution	Keyed	No brake	5000 rpm	100 mm / 25.4 mm	Approx. 2.7 kg class	100 mm / 25.4 mm
MPL-B310P-RK72AA	Resolver	Keyless	No brake	5000 rpm	100 mm / 25.4 mm	Verify exact configuration	100 mm / 25.4 mm
MPL-B320P-SK74AA	Single-turn high-resolution	Keyless	24 V DC	5000 rpm	100 mm / 50.8 mm	Verify exact configuration	100 mm / 50.8 mm

These models cover several important configuration differences, including shaft style, brake option, feedback technology, and magnet stack length.

27. Related Model Comparison

Model	Feedback	Shaft	Brake	Frame	Stack	Speed	Weight	Dimensions
MPL-B310P-SK74AA	Single-turn high-resolution	Keyless	24 V DC	100 mm	25.4 mm	5000 rpm	Approx. 3.63 kg reference	100 mm / 25.4 mm
MPL-B310P-SK72AA	Single-turn high-resolution	Keyless	None	100 mm	25.4 mm	5000 rpm	Approx. 2.68 kg	100 mm / 25.4 mm
MPL-B310P-SJ74AA	Single-turn high-resolution	Keyed	24 V DC	100 mm	25.4 mm	5000 rpm	Brake-equipped configuration	100 mm / 25.4 mm
MPL-B310P-SJ72AA	Single-turn high-resolution	Keyed	None	100 mm	25.4 mm	5000 rpm	Approx. 2.7 kg class	100 mm / 25.4 mm
MPL-B320P-SK74AA	Single-turn high-resolution	Keyless	24 V DC	100 mm	50.8 mm	5000 rpm	Verify exact model	100 mm / 50.8 mm

28. Five Other Common Models from the Same Brand

The following models are additional examples from the same industrial servo motor range and can be used when comparing different motor sizes, feedback configurations, and mechanical arrangements.

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

These models represent other configurations within the broader servo motor range and can be useful when comparing different machine requirements.

29. B310P and B320P Comparison

The B320P models use a longer magnet stack than the B310P configuration.

Model	Frame	Magnet Stack	Speed	Feedback	Shaft	Brake	Weight	Dimensions
MPL-B310P-SK74AA	100 mm	25.4 mm	5000 rpm	Single-turn high-resolution	Keyless	24 V DC	Approx. 3.63 kg reference	100 mm / 25.4 mm
MPL-B310P-SK72AA	100 mm	25.4 mm	5000 rpm	Single-turn high-resolution	Keyless	None	Approx. 2.68 kg	100 mm / 25.4 mm
MPL-B320P-SK74AA	100 mm	50.8 mm	5000 rpm	Single-turn high-resolution	Keyless	24 V DC	Verify exact model	100 mm / 50.8 mm
MPL-B320P-SK72AA	100 mm	50.8 mm	5000 rpm	Single-turn high-resolution	Keyless	None	Verify exact model	100 mm / 50.8 mm

The stack length is therefore an important factor when comparing B310P and B320P motors.

30. Typical Machine Functions

The MPL-B310P-SK74AA can be considered for a wide range of automated machine functions.

Typical examples include:

• Rotary indexing.
• Product positioning.
• Automated feeding.
• Packaging movement.
• Conveyor synchronization.
• Pick-and-place mechanisms.
• Assembly positioning.
• Rotary inspection.
• Printing and converting.
• Material transfer.
• Automated production stations.
• Positioning tables.
• High-cycle machine axes.
• Vertical positioning mechanisms where a suitable holding function is required.

The motor should be sized according to the actual machine load rather than selected only by application category.

31. Installation Considerations

The motor should be installed on a rigid machine structure with proper shaft alignment.

Incorrect alignment can increase bearing loads and vibration and may reduce the service life of the motor and connected mechanical components.

The keyless shaft should be connected using a suitable coupling or clamping mechanism.

The coupling should be selected according to the motor shaft dimensions, torque requirement, speed, and mechanical arrangement.

The motor should never be forced into alignment through the coupling.

32. Brake Installation Considerations

The 24 V DC brake adds another electrical and mechanical consideration to the installation.

The brake control circuit should be correctly integrated into the machine control sequence.

In many servo applications, the brake is released only after sufficient motor torque is available to control the load.

Likewise, when stopping a vertical axis, the control sequence should consider motor torque, axis position, brake engagement, and load movement.

The exact brake control method should follow the applicable system design and motor documentation.

33. Servo Tuning Considerations

Servo tuning should be based on the complete mechanical system.

Important factors include:

• Motor rotor inertia.
• Load inertia.
• Reflected load inertia.
• Gear ratio.
• Coupling stiffness.
• Belt stiffness.
• Screw characteristics.
• Mechanical backlash.
• Required acceleration.
• Required deceleration.
• Machine resonance.
• Positioning accuracy.
• Operating speed.
• Cycle time.
• Continuous torque.
• Peak torque.

The low-inertia construction allows rapid dynamic response, but the connected mechanical system still determines the final behavior of the servo axis.

A rigid machine may require substantially different tuning from a machine with flexible belts or long mechanical shafts.

34. Maintenance Considerations

Regular inspection should include the motor mounting, shaft coupling, electrical connectors, cables, brake function, and surrounding environment.

The keyless coupling should be checked for proper mechanical condition.

The brake should be inspected when it is an important part of the machine’s holding function.

Unusual vibration, excessive temperature, abnormal noise, unexpected positioning errors, or inconsistent stopping behavior should be investigated before continued operation.

35. Replacement Selection Checklist

Selection Item	MPL-B310P-SK74AA
Model	MPL-B310P-SK74AA
Brand	Allen-Bradley
Series	MPL Low-Inertia Servo
Product Family	MP-Series
Motor Type	Brushless AC Rotary Servo
Voltage	460 V AC
Frame	100 mm
Stack	25.4 mm
Speed	5000 rpm
Continuous Torque	Approx. 1.58 Nm
Peak Torque	Approx. 3.61 Nm
Continuous Power	Approx. 0.77 kW
Feedback	Single-turn high-resolution encoder
Feedback Resolution	1024 Sin/Cos cycles/rev
Feedback Protocol	Hiperface
Shaft	Keyless
Brake	24 V DC
Connector	SpeedTEC DIN
Connector Type	Right-angle
Connector Rotation	180°
Reference Weight	Approx. 3.63 kg
Main Dimensions	100 mm frame / 25.4 mm stack
Complete Dimensions	Verify exact mechanical drawing

36. Important Points Before Replacement

When replacing an MPL-B310P-SK74AA, the complete model number should be compared rather than matching only the physical frame size.

The following characteristics should be checked:

Voltage: 460 V class.

Frame: 100 mm.

Magnet stack: 25.4 mm.

Speed: 5000 rpm.

Feedback: Single-turn high-resolution encoder.

Feedback interface: Hiperface.

Shaft: Keyless.

Brake: 24 V DC holding brake.

Connector: SpeedTEC DIN, right-angle configuration.

Mounting: IEC metric.

Mechanical envelope: Verify the complete drawing.

This is particularly important because the MPL product family includes motors with similar frames but different shaft, feedback, brake, and stack configurations.

37. Product Advantages in Industrial Automation

The MPL-B310P-SK74AA provides a practical combination of high-speed operation, low-inertia construction, high-resolution feedback, keyless mechanical connection, and integrated holding brake.

For high-cycle machinery, the low-inertia construction can help the motor respond quickly to repeated speed changes.

For positioning applications, the encoder provides the feedback required by the servo control system.

For mechanically constrained installations, the rotatable right-angle connector can simplify cable routing.

For applications requiring shaft holding, the 24 V DC brake provides an integrated motor-mounted holding function.

For machines using keyless couplings, the shaft configuration provides the appropriate mechanical interface.

Together, these characteristics make the motor suitable for many automated industrial motion axes.

38. Product Selection by Application Requirement

Application Requirement	Relevant MPL-B310P-SK74AA Feature
Rapid acceleration and deceleration	Low-inertia rotor
High machine speed	5000 rpm configuration
Closed-loop position control	High-resolution encoder
Single-turn position feedback	Single-turn encoder
Keyless mechanical transmission	Keyless shaft
Shaft holding	24 V DC holding brake
Compact machine design	100 mm frame
Limited rear clearance	Right-angle connector
Flexible cable routing	180° connector rotation
Metric mounting	IEC metric mounting
High-cycle automation	Low-inertia servo construction

39. Overall Product Characteristics

The MPL-B310P-SK74AA is a compact industrial servo motor with a configuration centered around dynamic motion control.

Its 100 mm frame provides a relatively compact mounting format.

Its 25.4 mm magnet stack defines the B310P motor configuration.

Its 5000 rpm speed rating supports high-speed rotary applications.

Its single-turn high-resolution encoder provides detailed feedback for closed-loop servo control.

Its keyless shaft provides a mechanical interface suitable for compatible clamping-style couplings.

Its 24 V DC holding brake adds a shaft-holding function.

Its right-angle SpeedTEC DIN connector helps simplify installation in compact machinery.

These characteristics together form a servo motor configuration intended for controlled and repeatable industrial motion.

40. Final Technical Summary

Parameter	Final Specification
Model	MPL-B310P-SK74AA
Brand	Allen-Bradley
Product Family	MP-Series
Series	MPL Low-Inertia Servo Motors
Product Type	Brushless AC Rotary Servo Motor
Voltage	460 V AC
Voltage Class	400/460 V
Frame Size	Frame 3
Frame Dimension	100 mm
Magnet Stack	25.4 mm
Rated Speed	5000 rpm
Continuous Torque	Approximately 1.58 Nm
Peak Torque	Approximately 3.61 Nm
Continuous Rated Power	Approximately 0.77 kW
Rotor Inertia	Approximately 4.4 × 10⁻⁵ kg·m² class
Feedback	Single-turn high-resolution encoder
Feedback Resolution	1024 Sin/Cos cycles/rev
Feedback Protocol	Hiperface
Shaft	Keyless shaft extension
Shaft Seal	No shaft seal
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
Reference Weight	Approximately 3.63 kg
Main Dimensions	100 mm frame / 25.4 mm stack
Complete Motor Envelope	Refer to exact mechanical drawing

41. Final Product Description

The Allen-Bradley MPL-B310P-SK74AA is a low-inertia brushless AC rotary servo motor designed for industrial automation equipment requiring accurate positioning, rapid motion response, repeatable movement, and controlled speed.

The motor uses a 100 mm frame and a 25.4 mm magnet stack, forming the B310P configuration within the MPL servo motor family.

It is configured for 5000 rpm operation and provides approximately 1.58 Nm continuous torque, approximately 3.61 Nm peak torque, and approximately 0.77 kW continuous rated power.

The motor uses a single-turn high-resolution encoder with a listed 1024 Sin/Cos cycles per revolution feedback arrangement and Hiperface protocol.

A defining feature of this particular model is the keyless shaft extension. This configuration is intended for compatible mechanical couplings and clamping arrangements rather than conventional keyed-shaft connections.

Another major feature is the integrated 24 V DC holding brake.

The brake provides a shaft-holding function that can be useful in vertical positioning systems, lifting mechanisms, gravity-loaded axes, and other applications where the motor shaft should remain mechanically held when active servo torque is removed.

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

This connector arrangement gives machine builders additional flexibility when installing the motor inside compact equipment and routing cables around machine structures.

The principal dimensional identifiers are the 100 mm frame and 25.4 mm magnet stack.

A reference weight for the brake-equipped configuration is approximately 3.63 kg, although the exact shipping or product weight should be confirmed against the specific motor documentation when weight is critical.

The MPL-B310P-SK74AA can be used in packaging machinery, automated assembly equipment, indexing systems, material-handling equipment, printing and converting machinery, inspection systems, production lines, and other industrial motion-control applications.

The motor is particularly relevant to applications where the machine requires a combination of high-speed operation, low-inertia response, high-resolution feedback, keyless mechanical coupling, and shaft holding capability.

When selecting a replacement, the complete model number should be checked carefully. Frame size alone is not sufficient for determining interchangeability.

The voltage class, magnet stack, speed, feedback type, shaft configuration, brake configuration, connector arrangement, mounting dimensions, torque requirement, and complete mechanical envelope should all be considered.

The most closely related configurations include the MPL-B310P-SK72AA, which removes the integrated brake, and the MPL-B310P-SJ74AA, which retains the brake but changes the shaft from keyless to keyed.

This makes the MPL-B310P-SK74AA a specific configuration rather than simply a generic 100 mm servo motor.

For machine builders and maintenance personnel, the complete catalog number is therefore the most important starting point when selecting a replacement.

Overall, the MPL-B310P-SK74AA provides a compact 100 mm servo motor platform with 5000 rpm capability, low-inertia construction, single-turn high-resolution feedback, a keyless shaft, and a 24 V DC holding brake, making it a versatile configuration for many precision industrial motion-control applications.