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Allen-Bradley MPL-B310P-RK74AA Servo Motor
1. Product Overview
The Allen-Bradley MPL-B310P-RK74AA is an MP-Series MPL low-inertia brushless AC rotary servo motor designed for industrial motion-control equipment where controlled speed, repeatable positioning, rapid acceleration, and closed-loop operation are required.
This model is a 480 V-class servo motor with a 100 mm frame and 25.4 mm magnet stack. It has a maximum rated speed of 5000 rpm, uses a 2-pole resolver for feedback, and incorporates a 24 V DC holding brake.
The motor uses a keyless shaft extension and a right-angle SpeedTEC DIN connector. The connector can be rotated through approximately 180 degrees, providing useful flexibility when the motor is installed in a confined machine enclosure.
The RK74AA configuration is particularly important because it combines resolver feedback, a keyless shaft, and an integrated 24 V DC brake. These characteristics distinguish it from related MPL-B310P configurations that may have a keyed shaft, different feedback technology, or no brake.
2. Basic Product Parameters
| Parameter | Specification |
|---|---|
| Model | MPL-B310P-RK74AA |
| Brand | Allen-Bradley |
| Product Series | MP-Series MPL |
| Product Type | Low-Inertia Brushless AC Rotary Servo Motor |
| Motor Construction | Permanent-magnet brushless servo motor |
| Voltage Class | 480 V AC class |
| Armature Voltage | 460 V |
| Frame Size | 100 mm |
| Frame Designation | Frame Size 3 |
| Magnet Stack Length | 25.4 mm |
| Stack Designation | 10 |
| Maximum Rated Speed | 5000 rpm |
| Feedback | 2-pole resolver |
| Shaft | Keyless shaft extension |
| Shaft Key | None |
| Shaft Seal | None |
| Brake | 24 V DC holding brake |
| Connector | SpeedTEC DIN |
| Connector Orientation | Right angle |
| Connector Rotation | 180° rotatable |
| Mounting Flange | IEC metric |
| Mounting Hole Style | Type FF free mounting holes |
| Dimensions | 100 mm frame; 25.4 mm magnet stack; complete external envelope depends on the mechanical configuration |
| Weight | Approx. 5.44 kg |
| Operating Temperature | Approx. 0 to 40 °C |
| Storage Temperature | Approx. -30 to 70 °C |
| Relative Humidity | 5 to 95%, non-condensing |
The 100 mm frame, 25.4 mm stack, 5000 rpm rating, resolver feedback, keyless shaft, right-angle connector, and 24 V brake are the principal identifying characteristics of this configuration. The listed shipping/product weight is approximately 5.44 kg.
3. Brand
Brand: Allen-Bradley
The MPL-B310P-RK74AA belongs to the Allen-Bradley industrial motion-control product range.
The brand identification is useful when searching for replacement motors, compatible servo equipment, spare parts, feedback cables, and related motion-control components.
For maintenance purposes, the entire catalog number should be retained.
The difference between MPL-B310P-RK72AA and MPL-B310P-RK74AA, for example, is significant because the RK74AA configuration includes the 24 V DC brake, while the RK72AA configuration is the corresponding non-brake version.
4. Product Series
Series: MP-Series MPL Low-Inertia Brushless Servo Motors
The MPL series is a family of industrial low-inertia brushless servo motors intended for closed-loop motion applications.
The family includes several frame sizes and motor stack lengths, together with different feedback technologies, shaft arrangements, connector configurations, and brake options.
The MPL-B310P-RK74AA belongs to the 100 mm frame group and uses the 25.4 mm stack configuration.
This makes it a relatively compact member of the 100 mm MPL family in terms of motor stack length.
5. Product Type
The MPL-B310P-RK74AA is a:
Low-Inertia Brushless AC Rotary Servo Motor
It is not a conventional fixed-speed induction motor.
The motor is designed to operate with a compatible servo drive and motion-control system.
The servo drive controls the motor according to commanded speed, position, acceleration, deceleration, and torque requirements.
The resolver provides feedback information to the control system, allowing the servo system to monitor the motor’s rotational position.
The integrated 24 V DC brake provides mechanical holding capability when the brake is correctly controlled by the machine system.
6. Model Number Explanation
The complete model number is:
MPL-B310P-RK74AA
The model designation can be understood as a combination of family, voltage class, frame/stack configuration, feedback type, shaft arrangement, brake configuration, and catalog options.
| Model Section | General Identification |
|---|---|
| MPL | MPL low-inertia brushless servo motor family |
| B | 480 V-class motor family |
| 3 | Frame-size group 3 |
| 10 | 25.4 mm / 1.0 in. stack designation |
| P | Motor performance and frame configuration |
| R | Resolver feedback |
| K | Keyless shaft |
| 74 | Brake-equipped configuration |
| AA | Specific catalog configuration |
The complete catalog number should be used when ordering or replacing the motor.
Matching only the first portion of the model number is not sufficient because closely related motors can have different shaft, feedback, and brake arrangements.
7. Detailed Technical Specification
| Technical Parameter | MPL-B310P-RK74AA |
|---|---|
| Model | MPL-B310P-RK74AA |
| Brand | Allen-Bradley |
| Series | MP-Series MPL |
| Motor Type | Brushless AC rotary servo |
| Voltage Class | 480 V AC |
| Armature Voltage | 460 V |
| Frame Size | 100 mm |
| Magnet Stack | 25.4 mm |
| Maximum Speed | 5000 rpm |
| Feedback Device | 2-pole resolver |
| Shaft Configuration | Keyless |
| Shaft Seal | No shaft seal |
| Brake Voltage | 24 V DC |
| Brake | Integrated holding brake |
| Connector Type | SpeedTEC DIN |
| Connector Style | Right-angle |
| Connector Rotation | 180° |
| Mounting Standard | IEC metric |
| Mounting Holes | Type FF free mounting holes |
| Motor Inertia | Low-inertia design |
| Dimensions | 100 mm frame / 25.4 mm stack; full envelope must be checked against mechanical drawing |
| Weight | Approx. 5.44 kg |
8. Product Introduction
The MPL-B310P-RK74AA is designed for machines where conventional motor control is not sufficient and precise closed-loop rotary motion is required.
A servo motor is normally part of a larger system consisting of a controller, servo drive, motor, feedback device, mechanical transmission, and machine load.
The controller generates a motion command.
The servo drive interprets that command and supplies controlled electrical power to the motor.
The resolver provides motor-position information.
The drive continuously adjusts motor operation according to the feedback signal.
This closed-loop arrangement allows the motor to perform controlled acceleration, deceleration, positioning, speed regulation, and repeated motion cycles.
9. Low-Inertia Motor Design
One of the main characteristics of the MPL family is its low-inertia construction.
Low motor inertia can be useful when a machine needs rapid changes in speed.
For example, a packaging machine may need to accelerate a roller, reach a target speed, stop, reverse, and then repeat the sequence.
A low-inertia servo motor can respond rapidly to these changes when correctly matched with the load and servo drive.
This characteristic is also useful for indexing machines, pick-and-place equipment, positioning systems, and other equipment with frequent start-stop cycles.
10. 5000 RPM Speed Capability
The MPL-B310P-RK74AA has a maximum rated speed of 5000 rpm.
This makes it suitable for many high-speed industrial motion applications.
The actual machine operating speed should not be selected solely from the maximum motor speed.
The machine designer should consider:
- Load inertia
- Required torque
- Acceleration
- Deceleration
- Operating cycle
- Mechanical transmission
- Coupling limits
- Bearing loads
- Duty cycle
- Servo drive capability
The motor may operate below its maximum rated speed depending on the application.
11. Resolver Feedback
The motor uses a 2-pole resolver for feedback.
This is one of the most important identification characteristics of the model.
The resolver provides rotational-position information to the servo system.
Because the motor uses resolver feedback, the compatible servo drive must support the corresponding feedback arrangement.
A different MPL motor using a high-resolution encoder should not automatically be considered a direct replacement simply because the frame and shaft dimensions appear similar.
Feedback compatibility must be checked at the drive level.
12. Keyless Shaft
The MPL-B310P-RK74AA uses a keyless shaft extension.
This means the shaft does not use a conventional shaft key.
The machine therefore requires a compatible coupling, clamping hub, pulley, or other mechanical connection designed for a keyless shaft.
The keyless arrangement can provide a clean mechanical interface and is useful in applications where clamping-style couplings are preferred.
However, the coupling must be selected according to:
- Shaft diameter
- Shaft length
- Required torque
- Radial load
- Axial load
- Speed
- Coupling balance
- Alignment
The motor shaft should never be modified without confirming the mechanical requirements.
13. Integrated 24 V DC Brake
The RK74AA configuration includes a 24 V DC holding brake.
This is one of the major differences between the RK74AA and RK72AA configurations.
The brake can be used to mechanically hold the motor shaft when the servo system is not actively driving the motor.
This is particularly useful in machinery where the motor must remain stationary during certain portions of the machine cycle.
Potential applications include:
- Vertical positioning mechanisms
- Indexing mechanisms
- Machine axes requiring holding
- Gravity-loaded mechanisms
- Position-holding equipment
The brake should not be considered a substitute for the machine’s complete safety system.
Brake control, stopping logic, load holding, emergency stopping, and mechanical safety requirements should be evaluated separately.
14. Brake Operation Considerations
The integrated brake is a mechanical holding device rather than a replacement for servo control.
During normal servo operation, the drive controls motor movement.
When the machine requires the shaft to be mechanically held, the brake can be engaged according to the appropriate control sequence.
The exact brake timing should be coordinated with servo enable and disable functions.
Incorrect brake timing can cause unnecessary mechanical shock or motor movement.
For vertical axes, brake operation is especially important because the brake may be required to prevent the load from moving when motor torque is removed.
15. 100 mm Frame Construction
The motor uses a 100 mm frame.
The frame size is important when installing or replacing the motor.
It affects:
- Mounting dimensions
- Flange size
- Shaft centerline
- Motor body diameter
- Machine clearance
- Coupling alignment
- Motor support structure
The frame size should therefore be checked together with the stack length.
A motor with the same frame size but a different stack length may have a different overall length and different performance characteristics.
16. 25.4 mm Magnet Stack
The MPL-B310P-RK74AA uses a 25.4 mm magnet stack, equivalent to a 1-inch stack.
The short stack configuration provides a relatively compact motor length within the 100 mm frame group.
This can be useful when the machine has limited axial installation space.
The 25.4 mm stack should not, however, be interpreted as the complete motor length.
The actual installed envelope also includes the flange, shaft, rear housing, connector, and other mechanical features.
17. Dimensions
The most important confirmed dimensional characteristics are:
- 100 mm frame
- 25.4 mm magnet stack
The complete dimensional envelope should be taken from the applicable mechanical drawing when designing or modifying a machine.
| Dimension Parameter | Specification |
|---|---|
| Model | MPL-B310P-RK74AA |
| Frame Size | 100 mm |
| Frame Class | IEC Frame Size 3 |
| Magnet Stack | 25.4 mm |
| Stack Length | 1.0 in. |
| Shaft | Keyless |
| Connector | Right-angle DIN |
| Connector Rotation | 180° |
| Mounting | IEC metric |
| Mounting Holes | Type FF |
| Overall Motor Length | Verify from applicable mechanical drawing |
| Overall Width / Diameter | 100 mm frame class |
| Weight | Approx. 5.44 kg |
18. Weight
The listed product weight for the MPL-B310P-RK74AA is approximately:
5.44 kg
This value is useful when planning motor mounting, machine transportation, replacement procedures, and mechanical support.
When calculating the complete machine mass, the motor weight should be combined with:
- Coupling
- Gearbox
- Brake-related components
- Motor cable
- Feedback cable
- Mounting hardware
- Driven equipment
The motor weight should also be considered when designing removable machine modules or service-access mechanisms.
19. Environmental Characteristics
The motor is intended for industrial environments.
A commonly listed operating ambient range for this configuration is approximately 0 to 40 °C.
A commonly listed storage range is approximately -30 to 70 °C.
Relative humidity is generally specified in the range of 5 to 95% non-condensing.
| Environmental Parameter | Specification |
|---|---|
| Model | MPL-B310P-RK74AA |
| Operating Ambient Temperature | Approx. 0 to 40 °C |
| Storage Temperature | Approx. -30 to 70 °C |
| Relative Humidity | Approx. 5 to 95%, non-condensing |
| Installation Environment | Industrial motion-control equipment |
| Dimensions | 100 mm frame / 25.4 mm stack |
| Weight | Approx. 5.44 kg |
Actual environmental suitability should always be checked against the machine’s installation conditions.
20. Main Product Advantages
20.1 Low-Inertia Response
The low-inertia construction is useful for machines that require fast acceleration and deceleration.
It allows the servo system to respond quickly to motion commands when the motor is correctly matched to the machine load.
20.2 5000 RPM Maximum Speed
The 5000 rpm rating provides a useful operating range for high-speed industrial machinery.
It can support fast rotary mechanisms while retaining closed-loop servo control.
20.3 Resolver Feedback
The resolver provides feedback information required for closed-loop servo operation.
This makes the motor suitable for motion systems designed around resolver feedback.
20.4 Integrated Holding Brake
The 24 V DC brake adds mechanical holding capability.
This can be especially useful for axes that must remain stationary when the servo is disabled.
20.5 Keyless Shaft
The keyless shaft provides a suitable interface for compatible clamping-style couplings.
It can simplify certain machine transmission designs.
20.6 Compact 25.4 mm Stack
The short stack is useful where axial space is limited.
The motor retains the 100 mm frame while using a relatively short active stack.
20.7 Right-Angle Connector
The right-angle DIN connector can be useful when the motor is installed in a compact machine area.
The connector can also be rotated, providing additional flexibility for cable routing.
21. Typical Applications
21.1 Packaging Machinery
Packaging machinery often requires rapid and repeatable movement.
Servo motors can be used for:
- Feed rollers
- Indexing systems
- Cutting mechanisms
- Sealing mechanisms
- Rotary positioning
- Product transfer
The 5000 rpm capability and low-inertia construction are useful for fast machine cycles.
21.2 Automated Assembly
Automated assembly systems often require precise movement between multiple stations.
The motor can be used in:
- Rotary positioning systems
- Transfer mechanisms
- Assembly fixtures
- Indexing tables
- Component feeding systems
- Motion-controlled tooling
21.3 Material Handling
The motor can be applied to controlled rotary movement in material-handling machinery.
Typical examples include:
- Conveyors
- Transfer systems
- Rotary mechanisms
- Positioning stations
- Automated handling equipment
21.4 Machine Tools
Servo motors are widely used in machine tools because the machine needs controlled motion rather than simple constant-speed rotation.
The MPL-B310P-RK74AA can be considered for appropriate rotary or auxiliary motion applications where the servo-drive and feedback requirements match.
21.5 Printing Equipment
Printing and converting equipment can require accurate synchronization between rollers and other machine axes.
A servo motor can provide controlled speed and coordinated motion.
The resolver feedback provides the position information required for closed-loop operation.
21.6 Inspection Equipment
Automated inspection machines often need controlled rotary positioning.
The motor can be used for:
- Rotary inspection fixtures
- Indexing tables
- Camera positioning mechanisms
- Material positioning
- Test stations
21.7 Vertical Motion Applications
The integrated brake makes this configuration particularly relevant to certain vertical-axis applications.
However, the motor brake should be treated as part of the complete mechanical and safety design.
The brake rating, load, stopping sequence, and mechanical holding requirements should all be checked before using the motor on a gravity-loaded axis.
22. Application Advantages
| Application | Relevant Motor Characteristics | Dimensions | Weight |
|---|---|---|---|
| Packaging | Low inertia, 5000 rpm, servo feedback | 100 mm frame / 25.4 mm stack | Approx. 5.44 kg |
| Assembly | Position control, resolver feedback, brake | 100 mm frame / 25.4 mm stack | Approx. 5.44 kg |
| Material Handling | Controlled speed and acceleration | 100 mm frame / 25.4 mm stack | Approx. 5.44 kg |
| Machine Tools | Closed-loop rotary control | 100 mm frame / 25.4 mm stack | Approx. 5.44 kg |
| Printing | Speed coordination and feedback | 100 mm frame / 25.4 mm stack | Approx. 5.44 kg |
| Inspection | Repeatable rotary positioning | 100 mm frame / 25.4 mm stack | Approx. 5.44 kg |
| Vertical Axis | Integrated 24 V holding brake | 100 mm frame / 25.4 mm stack | Approx. 5.44 kg |
| Indexing | Fast acceleration/deceleration | 100 mm frame / 25.4 mm stack | Approx. 5.44 kg |
23. Electrical Parameters
| Electrical Parameter | Specification |
|---|---|
| Model | MPL-B310P-RK74AA |
| Voltage Class | 480 V AC |
| Armature Voltage | 460 V |
| Motor Type | Brushless permanent-magnet servo |
| Feedback | 2-pole resolver |
| Maximum Speed | 5000 rpm |
| Brake | 24 V DC |
| Control Type | Closed-loop servo |
| Servo Drive | Compatible servo drive required |
| Connector | SpeedTEC DIN |
| Dimensions | 100 mm frame / 25.4 mm stack |
| Weight | Approx. 5.44 kg |
24. Mechanical Parameters
| Mechanical Parameter | Specification |
|---|---|
| Model | MPL-B310P-RK74AA |
| Frame | 100 mm |
| Frame Designation | 3 |
| Magnet Stack | 25.4 mm |
| Stack Designation | 10 |
| Shaft | Keyless |
| Shaft Key | None |
| Shaft Seal | None |
| Mounting | IEC metric |
| Mounting Holes | Type FF |
| Connector | Right-angle SpeedTEC DIN |
| Connector Rotation | 180° |
| Overall Dimensions | Refer to applicable mechanical drawing |
| Weight | Approx. 5.44 kg |
25. Brake and Non-Brake Comparison
The closest comparison is the MPL-B310P-RK72AA.
| Parameter | MPL-B310P-RK74AA | MPL-B310P-RK72AA |
|---|---|---|
| Series | MPL | MPL |
| Frame | 100 mm | 100 mm |
| Stack | 25.4 mm | 25.4 mm |
| Maximum Speed | 5000 rpm | 5000 rpm class |
| Feedback | Resolver | Resolver |
| Shaft | Keyless | Keyless |
| Brake | 24 V DC brake | No brake |
| Dimensions | 100 mm frame / 25.4 mm stack | 100 mm frame / 25.4 mm stack |
| Weight | Approx. 5.44 kg | Verify exact model weight |
The two models are mechanically related, but the brake difference is important.
If the original machine requires a brake, the RK72AA should not be assumed to be an equivalent replacement.
26. Five Related or Same-Series Models
The following five models are closely related to the MPL-B310P-RK74AA.
| Model | Product Type | Frame / Stack | Speed Class | Feedback | Shaft | Brake | Dimensions | Weight |
|---|---|---|---|---|---|---|---|---|
| MPL-B310P-RK72AA | MPL low-inertia servo | 100 mm / 25.4 mm | 5000 rpm | Resolver | Keyless | No brake | 100 mm frame / 25.4 mm stack | Verify exact model weight |
| MPL-B310P-RJ74AA | MPL low-inertia servo | 100 mm / 25.4 mm | 5000 rpm | Resolver | Keyed | 24 V DC brake | 100 mm frame / 25.4 mm stack | Verify exact model weight |
| MPL-B310P-SK74AA | MPL low-inertia servo | 100 mm / 25.4 mm | 5000 rpm | High-resolution feedback | Keyless | 24 V DC brake | 100 mm frame / 25.4 mm stack | Verify exact model weight |
| MPL-B310P-MK74AA | MPL low-inertia servo | 100 mm / 25.4 mm | 5000 rpm | Multi-turn high-resolution feedback | Keyless | 24 V DC brake | 100 mm frame / 25.4 mm stack | Verify exact model weight |
| MPL-B320P-RK74AA | MPL low-inertia servo | 100 mm / 50.8 mm | 5000 rpm | Resolver | Keyless | 24 V DC brake | 100 mm frame / 50.8 mm stack | Verify exact model weight |
These models are related because they belong to the same MPL family and share substantial portions of the mechanical platform. The differences in feedback technology, shaft configuration, brake configuration, and stack length should be checked before considering any of them as a replacement.
27. Five Common Same-Brand MPL Models
The following models are useful additional references from the same Allen-Bradley MPL servo family.
They should be considered comparison models rather than automatic replacements.
| Model | Product Type | Voltage Class | Frame / Stack | Speed Class | Feedback | Brake / Configuration | Dimensions | Weight |
|---|---|---|---|---|---|---|---|---|
| MPL-B210V-VJ72AA | MPL low-inertia servo | 480 V class | 75 mm / 25.4 mm | 8000 rpm | Multi-turn high-resolution | No brake | 75 mm frame / 25.4 mm stack | Verify exact model weight |
| MPL-B220T-VJ72AA | MPL low-inertia servo | 480 V class | 75 mm / 50.8 mm | 6000 rpm | Multi-turn high-resolution | No brake | 75 mm frame / 50.8 mm stack | Verify exact model weight |
| MPL-B230P-VJ74AA | MPL low-inertia servo | 480 V class | 75 mm / 76.2 mm | 5000 rpm | Multi-turn high-resolution | 24 V brake | 75 mm frame / 76.2 mm stack | Verify exact model weight |
| MPL-B320P-MJ72AA | MPL low-inertia servo | 480 V class | 100 mm / 50.8 mm | 5000 rpm | Multi-turn high-resolution | No brake | 100 mm frame / 50.8 mm stack | Verify exact model weight |
| MPL-B330P-MJ72AA | MPL low-inertia servo | 480 V class | 100 mm / 76.2 mm | 5000 rpm | Multi-turn high-resolution | No brake | 100 mm frame / 76.2 mm stack | Verify exact model weight |
The MPL-B210V, B220T, B230P, B320P, and B330P groups represent different combinations of frame size, stack length, speed, and feedback configuration within the MPL family.
28. Related Model Comparison
| Model | Frame | Stack | Speed | Feedback | Shaft | Brake | Dimensions | Weight |
|---|---|---|---|---|---|---|---|---|
| MPL-B310P-RK74AA | 100 mm | 25.4 mm | 5000 rpm | Resolver | Keyless | 24 V | 100 mm / 25.4 mm | Approx. 5.44 kg |
| MPL-B310P-RK72AA | 100 mm | 25.4 mm | 5000 rpm | Resolver | Keyless | None | 100 mm / 25.4 mm | Verify exact weight |
| MPL-B310P-RJ74AA | 100 mm | 25.4 mm | 5000 rpm | Resolver | Keyed | 24 V | 100 mm / 25.4 mm | Verify exact weight |
| MPL-B310P-SK74AA | 100 mm | 25.4 mm | 5000 rpm | High-resolution | Keyless | 24 V | 100 mm / 25.4 mm | Verify exact weight |
| MPL-B320P-RK74AA | 100 mm | 50.8 mm | 5000 rpm | Resolver | Keyless | 24 V | 100 mm / 50.8 mm | Verify exact weight |
29. Why the Related Models Should Not Be Treated as Identical
The MPL family contains many motors that share the same basic housing platform.
However, a motor’s suitability depends on much more than its physical frame.
Important differences can include:
- Feedback technology
- Shaft configuration
- Brake
- Stack length
- Motor inertia
- Electrical characteristics
- Connector arrangement
- Servo-drive compatibility
For example, changing from resolver feedback to high-resolution encoder feedback can require a different drive configuration.
Changing from a keyless shaft to a keyed shaft can require a different coupling.
Changing from a non-brake motor to a brake motor can affect machine wiring and control logic.
30. Servo Drive Compatibility
The MPL-B310P-RK74AA must be used with a compatible servo drive.
The drive must support the motor’s electrical characteristics and resolver feedback system.
During replacement, the following should be checked:
- Motor voltage class.
- Motor catalog number.
- Feedback type.
- Resolver interface.
- Motor speed rating.
- Brake voltage.
- Brake control output.
- Motor cable.
- Feedback cable.
- Drive motor configuration.
The motor should not be connected to an arbitrary servo amplifier simply because both devices use similar voltage ratings.
31. Brake Wiring
The integrated brake requires appropriate control wiring.
The brake circuit should be designed so that the brake engages and releases at the correct points in the machine cycle.
Incorrect sequencing can result in:
- Motor movement during startup
- Mechanical shock
- Unnecessary brake wear
- Excessive motor load
- Unexpected vertical-axis movement
The brake should therefore be considered part of the machine’s motion sequence rather than simply an accessory.
32. Vertical-Axis Applications
The integrated brake can make the MPL-B310P-RK74AA useful for certain vertical-axis applications.
For example, a machine may use a servo motor to position a vertical mechanism and use the brake to hold the axis when servo torque is removed.
However, the brake must be properly sized for the actual load.
The designer should consider:
- Load mass
- Gear ratio
- Screw pitch
- Mechanical efficiency
- Brake torque
- Acceleration
- Deceleration
- Emergency-stop behavior
- Holding requirements
- Mechanical safety provisions
A servo motor brake should not be considered the only protection against a falling load where additional mechanical protection is required.
33. Maintenance Advantages
The complete catalog number makes the motor relatively easy to identify during maintenance.
For an existing machine, technicians should record:
MPL-B310P-RK74AA
rather than recording only “MPL-B310P.”
The complete suffix contains important configuration information.
The technician should also photograph or record the motor nameplate before ordering a replacement.
34. Mechanical Installation
Correct mechanical installation is important for servo motor performance.
The mounting surface should be clean and properly aligned.
The motor flange should be securely mounted.
The coupling should be aligned with the driven shaft.
The keyless shaft should use a compatible clamping coupling.
Excessive radial or axial loading should be avoided.
Poor alignment can produce:
- Vibration
- Bearing wear
- Coupling damage
- Excessive motor temperature
- Noise
- Positioning errors
- Reduced service life
35. Connector Arrangement
The MPL-B310P-RK74AA uses a right-angle SpeedTEC DIN connector.
The connector can be rotated through approximately 180 degrees.
This feature can be helpful in compact machines.
It allows the cable outlet to be positioned in a direction that better matches the available machine space.
However, adequate clearance should still be provided around the connector.
The cable should not be sharply bent immediately at the connector.
36. Servo Tuning
After replacing a servo motor, the machine’s servo configuration should be checked.
Important parameters can include:
- Motor identification
- Feedback configuration
- Maximum speed
- Torque limits
- Acceleration
- Deceleration
- Position loop
- Velocity loop
- Electronic gearing
- Mechanical transmission ratio
- Inertia ratio
A physically compatible motor can still require configuration changes in the servo drive.
37. Load Inertia
Servo performance depends strongly on the relationship between motor inertia and machine load inertia.
If the connected load is too large or poorly matched, the machine may experience:
- Overshoot
- Excessive settling time
- Vibration
- Following errors
- Slow acceleration
- Excessive motor current
- Increased motor temperature
The motor should therefore be selected according to the complete machine motion profile.
38. Typical Industrial Uses
The MPL-B310P-RK74AA can be considered for:
- Packaging machines
- Automated assembly systems
- Rotary indexing machines
- Material-handling systems
- Printing equipment
- Converting machinery
- Inspection systems
- Machine tools
- Process machinery
- Automated production lines
- Servo-controlled positioning systems
- Vertical positioning systems
- Rotary transfer equipment
The exact suitability depends on the load, torque requirement, speed, cycle time, feedback architecture, and drive configuration.
39. Application Selection Table
| Application Requirement | MPL-B310P-RK74AA Consideration | Dimensions | Weight |
|---|---|---|---|
| High-speed rotary motion | 5000 rpm maximum speed | 100 mm / 25.4 mm | Approx. 5.44 kg |
| Resolver feedback | Built-in 2-pole resolver | 100 mm / 25.4 mm | Approx. 5.44 kg |
| Keyless coupling | Keyless shaft provided | 100 mm / 25.4 mm | Approx. 5.44 kg |
| Brake required | Integrated 24 V DC brake | 100 mm / 25.4 mm | Approx. 5.44 kg |
| Compact axial installation | Short 25.4 mm stack | 100 mm / 25.4 mm | Approx. 5.44 kg |
| Vertical positioning | Brake can provide holding function | 100 mm / 25.4 mm | Approx. 5.44 kg |
| Encoder-only drive | Feedback compatibility must be checked | 100 mm / 25.4 mm | Approx. 5.44 kg |
| Keyed-shaft machine | Mechanical compatibility must be checked | 100 mm / 25.4 mm | Approx. 5.44 kg |
40. Important Replacement Considerations
When replacing an MPL-B310P-RK74AA, the following items should be checked carefully.
Electrical
- 480 V-class motor system
- 460 V armature rating
- Servo drive compatibility
- Resolver feedback
- Brake voltage
Mechanical
- 100 mm frame
- 25.4 mm stack
- Keyless shaft
- Mounting flange
- Shaft dimensions
- Coupling
- Connector clearance
Control
- Resolver feedback configuration
- Servo motor parameters
- Brake timing
- Acceleration
- Deceleration
- Torque limits
- Positioning parameters
41. Product Advantages for Machine Builders
The MPL-B310P-RK74AA provides a practical combination of features for machine builders.
The 100 mm frame offers a larger mounting platform than the smaller MPL motor families.
The 25.4 mm stack keeps the motor relatively compact in the axial direction.
The low-inertia construction supports rapid motion changes.
The resolver provides closed-loop feedback.
The keyless shaft supports compatible clamping-style mechanical transmission.
The integrated 24 V brake provides a mechanical holding function when required.
The right-angle connector helps with cable routing in compact equipment.
Together, these characteristics make the motor suitable for a wide range of industrial motion-control applications.
42. Product Advantages for Maintenance
For maintenance departments, the MPL-B310P-RK74AA offers clear identification through its complete catalog number.
The model identifies an important combination of:
- MPL family
- 480 V class
- 100 mm frame
- 25.4 mm stack
- Resolver feedback
- Keyless shaft
- 24 V brake
This makes it easier to distinguish the motor from similar MPL models.
The brake configuration is particularly important because a non-brake motor cannot automatically replace a brake-equipped motor when the machine depends on mechanical holding.
43. Main Technical Characteristics at a Glance
| Item | Specification |
|---|---|
| Model | MPL-B310P-RK74AA |
| Brand | Allen-Bradley |
| Series | MP-Series MPL |
| Product Type | Low-Inertia Brushless AC Servo Motor |
| Voltage Class | 480 V AC |
| Armature Voltage | 460 V |
| Frame | 100 mm |
| Stack | 25.4 mm |
| Maximum Speed | 5000 rpm |
| Feedback | 2-pole Resolver |
| Shaft | Keyless |
| Brake | 24 V DC |
| Connector | Right-angle SpeedTEC DIN |
| Connector Rotation | 180° |
| Mounting | IEC metric |
| Mounting Holes | Type FF |
| Dimensions | 100 mm frame / 25.4 mm stack; complete envelope requires mechanical drawing |
| Weight | Approx. 5.44 kg |
| Primary Function | Closed-loop industrial rotary motion |
| Main Features | Low inertia, resolver feedback, keyless shaft, integrated brake |
44. Final Product Description
The Allen-Bradley MPL-B310P-RK74AA is a 480 V-class MPL low-inertia brushless AC rotary servo motor intended for industrial motion-control systems requiring controlled speed, repeatable positioning, rapid acceleration, and closed-loop feedback.
Its primary configuration is based on a 100 mm frame and 25.4 mm magnet stack, with a maximum rated speed of 5000 rpm.
The motor uses a 2-pole resolver, giving it a clearly defined feedback configuration for compatible servo systems.
The keyless shaft is another important characteristic and makes the motor suitable for mechanical systems using compatible clamping-style couplings.
The integrated 24 V DC holding brake distinguishes the RK74AA version from the corresponding non-brake RK72AA configuration.
The right-angle SpeedTEC DIN connector, with approximately 180° rotational flexibility, provides additional freedom when routing motor and feedback cables inside compact machinery.
From an application standpoint, the motor can be considered for packaging equipment, automated assembly systems, indexing machinery, material handling, printing and converting equipment, inspection systems, machine tools, and other industrial machines requiring controlled rotary motion.
For vertical-axis applications, the integrated brake can provide a useful holding function, but the complete mechanical and safety design must still be evaluated.
For replacement work, the complete MPL-B310P-RK74AA catalog number is important. A motor with the same 100 mm frame but different feedback, shaft, stack, or brake configuration should not automatically be regarded as a direct replacement.
In practical terms, the MPL-B310P-RK74AA combines a 100 mm frame, 25.4 mm stack, 5000 rpm speed capability, resolver feedback, keyless shaft, and 24 V DC brake in one compact industrial servo-motor configuration.
Its approximately 5.44 kg weight should also be considered when designing mounting structures, replacement procedures, and removable machine assemblies.
For machine builders, the main attraction is the combination of low-inertia servo response, closed-loop resolver feedback, high rotational speed, compact stack length, keyless mechanical interface, and integrated holding brake.
For maintenance teams, the complete catalog number provides a useful identification point when selecting a replacement and distinguishing this brake-equipped resolver/keyless configuration from other MPL-B310P variants.
Overall, the MPL-B310P-RK74AA is a specialized industrial servo motor configuration intended for demanding automated machinery where controlled rotary motion, feedback-based operation, compact mechanical construction, and shaft holding capability are important.