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Allen-Bradley MPL-B420P-RK74AA Servo Motor
Product Overview
The MPL-B420P-RK74AA is a low-inertia rotary AC servo motor in the Allen-Bradley MP-Series MPL family. It is designed for high-speed motion-control applications where accurate positioning, rapid acceleration and deceleration, repeatability, and reliable torque control are important.
The motor is rated for a 460 V AC class supply and provides a continuous output torque of approximately 4.74 N·m, with a peak torque capability of approximately 13.5 N·m. Its rated speed is 5000 RPM, making it suitable for applications that require fast rotary movement and dynamic response.
The MPL-B420P-RK74AA uses resolver feedback and incorporates a keyless shaft configuration. It also includes a 24 V DC holding brake, which makes the motor particularly useful for machines where the load must be held in position when motor power is removed.
The motor uses a 115 mm IEC metric frame and a 50.8 mm magnet stack length. Its IP66 housing design provides a strong level of protection against dust and water exposure, making it suitable for a wide range of industrial environments.
The right-angle DIN connector can be rotated through 180 degrees, giving machine builders greater flexibility when routing motor cables and designing compact machine layouts.
Basic Product Information
| Parameter | Specification |
|---|---|
| Brand | Allen-Bradley |
| Product Model | MPL-B420P-RK74AA |
| Product Family | MP-Series |
| Product Series | MPL Low-Inertia Servo Motors |
| Product Type | Rotary AC Servo Motor |
| Motor Design | Low-Inertia Brushless Servo Motor |
| Voltage Class | 460 V AC |
| Rated Power | 1.9 kW |
| Continuous Torque | 4.74 N·m |
| Peak Torque | 13.5 N·m |
| Rated Speed | 5000 RPM |
| Maximum Speed | 5000 RPM |
| Feedback Type | Resolver |
| Shaft Type | Keyless Shaft Extension |
| Brake | 24 V DC Integral Brake |
| Connector | SpeedTEC DIN Connector |
| Connector Orientation | Right Angle |
| Connector Rotation | 180° Rotatable |
| Frame Size | 115 mm |
| Magnet Stack Length | 50.8 mm |
| Number of Phases | 3 Phase |
| Motor Protection | IP66 |
| Duty Rating | S1 |
| Mounting | IEC Metric Flange Mount |
| Mounting Hole Style | Free Mounting Holes, Type FF |
| Shaft Seal | No |
| Approximate Weight | 4.3 kg |
| Approximate Mechanical Envelope | About 133 × 187 × 98 mm, depending on configuration and connector arrangement |
| Operating Temperature | Approximately 0 to 40 °C |
| Motor Construction | Brushless Permanent-Magnet Servo Motor |
The dimensional figures above should be treated as practical reference values rather than a substitute for the mechanical drawing when preparing a machine mounting plate or replacement installation.
Brand
Allen-Bradley
The MPL-B420P-RK74AA belongs to the Allen-Bradley brand and is part of its industrial motion-control product range.
Allen-Bradley servo products are commonly used in automated machinery where controlled acceleration, precise positioning, synchronized movement, and repeatable operation are required.
For this particular motor, the combination of a 5000 RPM operating speed, 4.74 N·m continuous torque, resolver feedback, low-inertia rotor design, and integral 24 V DC brake makes it appropriate for machinery requiring relatively fast and responsive rotary motion.
Product Series
MP-Series MPL Low-Inertia Servo Motor Series
The MPL-B420P-RK74AA belongs to the MP-Series MPL Low-Inertia Servo Motor series.
The MPL series is designed around a low-inertia servo motor concept. Compared with a conventional high-inertia motor, a low-inertia servo motor can respond quickly to changes in commanded speed and position.
This is particularly useful in machines that repeatedly accelerate, decelerate, stop, reverse direction, or perform rapid positioning movements.
The MPL family includes several frame sizes, torque ranges, feedback technologies, shaft configurations, and brake options. The model number identifies the electrical, mechanical, feedback, shaft, connector, and brake configuration.
For the MPL-B420P-RK74AA, the model designation can generally be understood as follows:
| Model Code Section | Meaning |
|---|---|
| MPL | MPL low-inertia servo motor family |
| B | 460 V class |
| 4 | Frame size 4 / approximately 115 mm |
| 20 | Magnet stack length 20 / 50.8 mm |
| P | 5000 RPM speed class |
| R | Resolver feedback |
| K | Keyless shaft configuration |
| 7 | SpeedTEC DIN right-angle connector configuration |
| 4 | 24 V DC brake |
| AA | Product configuration suffix |
This makes the model different from other MPL-B420P motors that may have the same basic power and torque rating but use different feedback systems, shaft designs, or brake configurations.
Detailed Technical Specifications
Electrical and Performance Parameters
| Parameter | MPL-B420P-RK74AA |
|---|---|
| Rated Voltage | 460 V AC |
| Voltage Class | 460 V |
| Rated Power | 1.9 kW |
| Rated Speed | 5000 RPM |
| Maximum Speed | 5000 RPM |
| Continuous Torque | 4.74 N·m |
| Peak Torque | 13.5 N·m |
| Continuous Stall Torque | Approximately 4.74 N·m |
| Number of Phases | 3 |
| Rated Frequency | 50–60 Hz range |
| Duty Cycle | S1 |
| Feedback | Resolver |
| Rotor Type | Permanent-Magnet |
| Motor Type | Brushless Synchronous Servo Motor |
| Rotor Inertia | Approximately 0.00026 kg·m² |
| Protection Rating | IP66 |
| Operating Temperature | Approximately 0 to 40 °C |
The 4.74 N·m continuous torque rating is one of the most important characteristics of the motor. It represents the torque the motor is designed to deliver continuously under its specified operating conditions.
The approximately 13.5 N·m peak torque capability provides additional short-duration torque for acceleration, deceleration, rapid direction changes, and other dynamic motion requirements.
The 1.9 kW rated output places this model in a useful middle range of the MPL family. It is considerably more powerful than smaller MPL-B310P and MPL-B320P motors, while remaining more compact than higher-torque models such as the MPL-B430P.
Mechanical Specifications
| Mechanical Parameter | Specification |
|---|---|
| Frame Size | 115 mm |
| IEC Frame | 115 mm |
| Magnet Stack | 50.8 mm |
| Stack Code | 20 |
| Shaft Type | Keyless |
| Shaft Extension | Keyless Shaft Extension |
| Shaft Seal | No |
| Mounting Type | IEC Metric Flange Mount |
| Mounting Holes | Free Mounting Holes, Type FF |
| Connector Position | Right Angle |
| Connector Rotation | 180° |
| Approximate Overall Size | About 133 × 187 × 98 mm |
| Approximate Weight | 4.3 kg |
| Enclosure Rating | IP66 |
| Brake | Integral 24 V DC Brake |
The 115 mm frame is an important mechanical specification when replacing another servo motor. The mounting flange, shaft position, shaft diameter, pilot dimensions, and bolt pattern should all be checked before installation.
The 50.8 mm magnet stack length is associated with the model’s “20” stack designation. It is one of the characteristics that distinguishes the B420P from other frame and stack combinations within the MPL family.
The motor uses a keyless shaft. This is important because a keyless shaft should not automatically be treated as mechanically interchangeable with a keyed-shaft version of the same motor family.
Dimensions and Weight
The mechanical size of the MPL-B420P-RK74AA is based around a 115 mm frame and a 50.8 mm magnet stack.
| Dimension / Physical Parameter | Approximate Value |
|---|---|
| Frame Width / Frame Size | 115 mm |
| Magnet Stack Length | 50.8 mm |
| Approximate Motor Width | 133 mm |
| Approximate Overall Body Length | 187 mm |
| Approximate Body Height | 98 mm |
| Approximate Weight | 4.3 kg |
| Protection | IP66 |
For engineering installation, the 115 mm frame and 50.8 mm stack dimensions are more useful reference points than an estimated overall envelope. The final mechanical dimensions should always be checked against the specific motor drawing when designing a new mounting plate, coupling arrangement, enclosure, or replacement assembly.
The approximately 4.3 kg motor weight should also be considered when designing machine brackets and motor support structures.
Feedback System
Resolver Feedback
One of the defining characteristics of the MPL-B420P-RK74AA is its resolver feedback system.
A resolver is a robust position-feedback device that provides the servo control system with information about motor position and rotation. Resolver-based feedback is often valued in industrial environments because of its rugged construction and resistance to demanding operating conditions.
The resolver configuration also makes the RK version different from other B420P models using high-resolution or absolute encoder feedback.
For applications where the motion controller and servo drive are already designed around resolver feedback, selecting the correct resolver-equipped motor can simplify system integration and avoid replacing other motion-control hardware.
Keyless Shaft Design
The MPL-B420P-RK74AA uses a keyless shaft extension.
A keyless shaft can provide a clean mechanical interface for suitable couplings and machine components. However, the coupling must be selected specifically for the shaft dimensions and torque requirements of the motor.
This configuration is particularly important when replacing a keyed-shaft motor. Even if two motors have identical power, speed, frame size, and torque ratings, their shafts may not be mechanically interchangeable.
Therefore, the shaft type should always be considered alongside electrical specifications during motor replacement.
Integral 24 V DC Brake
The MPL-B420P-RK74AA includes a 24 V DC integral brake.
The brake is especially useful for vertical axes and applications where a mechanical load needs to remain stationary when the servo motor is not energized.
Typical examples include:
- Vertical lifting mechanisms
- Z-axis positioning systems
- Pick-and-place machines with vertical movement
- Elevator-style machine mechanisms
- Material handling equipment
- Automated loading and unloading systems
- Machines where the axis must remain stationary during power-off conditions
The brake should not normally be treated as the primary means of dynamic stopping. Servo control and machine safety functions should be designed separately according to the requirements of the application.
IP66 Protection
The motor has an IP66-rated housing.
This makes the motor suitable for industrial environments where dust, dirt, and water exposure may occur.
IP66 protection is useful in applications such as:
- Packaging machinery
- Material handling systems
- Production lines
- Automated assembly equipment
- Machine tools
- Industrial processing machinery
- Factory automation equipment
The IP66 rating provides a useful level of environmental protection, although the actual suitability of the motor still depends on the complete installation environment, cable connections, cleaning methods, temperature, chemicals, and other operating conditions.
Connector Configuration
The motor uses a SpeedTEC DIN connector in a right-angle configuration.
The connector can be rotated through approximately 180 degrees, providing greater flexibility during machine installation.
This is particularly helpful in compact equipment where a straight connector could interfere with:
- Machine guards
- Cable trays
- Adjacent motors
- Linear slides
- Structural members
- Control cabinets
- Protective covers
The flexible connector orientation can make cable routing cleaner and can reduce unnecessary bending of motor cables.
Product Introduction
The MPL-B420P-RK74AA is a high-speed, low-inertia servo motor intended for demanding industrial motion-control applications.
Its 5000 RPM rated speed allows it to support fast machine cycles, while the 4.74 N·m continuous torque provides a useful combination of speed and torque for medium-duty servo axes.
The low-inertia design is particularly beneficial for machines that perform repeated acceleration and deceleration.
When a machine repeatedly changes speed, a lower motor inertia can help the control system achieve faster dynamic response. This can be important in applications where cycle time and positioning accuracy directly influence production efficiency.
The resolver feedback system provides the required motor position information to the servo system, while the keyless shaft simplifies integration with suitable mechanical couplings.
The integral 24 V DC brake adds another useful capability, especially for vertical axes and load-holding applications.
Overall, the MPL-B420P-RK74AA is a practical combination of relatively high speed, moderate continuous torque, peak torque capability, resolver feedback, mechanical protection, and integrated braking.
Main Product Advantages
1. High-Speed 5000 RPM Operation
The 5000 RPM rated speed is one of the major strengths of the MPL-B420P-RK74AA.
High rotational speed can help machinery complete positioning and rotary operations quickly, particularly when the application requires repeated short movements.
This makes the motor suitable for high-cycle machinery where reducing the time required for each movement can improve overall machine productivity.
2. Strong Continuous Torque
With approximately 4.74 N·m of continuous torque, the motor can handle a substantial range of industrial motion applications.
The torque level makes it useful for applications that require more capability than smaller MPL motors while still maintaining a relatively compact 115 mm frame.
3. High Peak Torque Capability
The motor provides approximately 13.5 N·m of peak torque.
This additional torque is useful during acceleration and other short-duration high-load conditions.
For machines with frequent starts, stops, direction changes, or rapid positioning movements, peak torque capability can be just as important as continuous torque.
4. Low-Inertia Design
The MPL series uses a low-inertia motor design intended for fast dynamic response.
This is valuable in machines that frequently change velocity.
Examples include:
- Pick-and-place equipment
- Packaging machines
- Indexing systems
- High-speed assembly machinery
- Electronic component handling
- Cutting and positioning systems
- Printing and converting machinery
5. Resolver Feedback
Resolver feedback provides a robust position-feedback solution.
It can be advantageous in applications where durability and reliable feedback are more important than using the highest-resolution absolute encoder technology.
The resolver configuration is also useful when maintaining compatibility with an existing motion-control architecture.
6. Integral Brake
The built-in 24 V DC brake provides an important advantage for vertical and gravity-loaded applications.
It can help hold a mechanical axis in position when motor power is removed, subject to proper system and safety design.
7. IP66 Protection
The IP66 enclosure helps protect the motor against dust and water exposure.
This provides greater flexibility when installing the motor in demanding industrial environments.
8. Flexible Connector Orientation
The 180-degree rotatable right-angle connector provides useful flexibility for machine builders.
It can make cable routing easier and help reduce interference with surrounding machine components.
9. Compact 115 mm Frame
The 115 mm frame offers a useful balance between motor output and machine size.
For machines where installation space is limited, a compact servo motor can simplify mechanical design while still providing sufficient torque and speed.
Typical Applications
Packaging Machinery
The MPL-B420P-RK74AA is well suited to packaging equipment that requires rapid and repeatable rotary movement.
Typical applications include:
- Film feeding
- Product positioning
- Labeling
- Sealing mechanisms
- Cutting mechanisms
- Conveyor synchronization
- Rotary indexing
The 5000 RPM speed and low-inertia construction are particularly useful for high-cycle packaging operations.
Automated Assembly Equipment
Automated assembly systems often require several servo axes to move in synchronization.
The motor can be used for:
- Component positioning
- Screwdriving mechanisms
- Press positioning
- Rotary indexing
- Component transfer
- Tool positioning
- Pick-and-place systems
Its moderate continuous torque and fast response make it appropriate for many medium-duty assembly axes.
Material Handling
Material-handling systems often require rapid acceleration and controlled deceleration.
Possible applications include:
- Conveyor positioning
- Transfer units
- Rotary tables
- Sorting equipment
- Automated loading systems
- Product handling mechanisms
- Pallet positioning
The integral brake can be particularly useful when the motor is used on a vertical axis.
Pick-and-Place Systems
Pick-and-place machinery benefits from fast acceleration and precise positioning.
The low-inertia MPL design can help reduce the time required to move between positions.
Typical uses include:
- Electronic component handling
- Packaging product transfer
- Robotic auxiliary axes
- Automated inspection systems
- Small assembly systems
- Product sorting
Vertical Positioning Systems
The integral 24 V DC brake makes the motor particularly attractive for vertical positioning applications.
Examples include:
- Z-axis systems
- Vertical slides
- Lifting mechanisms
- Automated feeders
- Vertical transfer units
- Machine tool auxiliary axes
When using the motor on a vertical axis, the brake, servo drive, mechanical transmission, and safety system should be designed as a complete system.
Machine Tools
The motor can also be used in machine-tool motion applications where a combination of speed, torque, and controlled positioning is required.
Potential applications include:
- Auxiliary rotary axes
- Tool positioning
- Indexing
- Feed mechanisms
- Automatic tool handling
- Material positioning
The specific suitability depends on load inertia, acceleration requirements, duty cycle, mechanical transmission, and controller compatibility.
Why Choose the MPL-B420P-RK74AA?
The MPL-B420P-RK74AA is particularly attractive when the application requires several characteristics at the same time:
- 460 V class operation
- 1.9 kW output
- 4.74 N·m continuous torque
- 13.5 N·m peak torque
- 5000 RPM operation
- Low-inertia motor construction
- Resolver feedback
- Keyless shaft
- 24 V DC brake
- IP66 protection
- 115 mm frame
- Flexible right-angle connector
The combination is more important than any individual specification.
For example, a motor with the same power rating but a different feedback system may not be a suitable replacement. Similarly, a motor with the same torque and speed but a keyed shaft instead of a keyless shaft may require mechanical modifications.
Therefore, the complete model number should be considered when selecting a replacement.
Five Related Models in the Same Series
The following models are closely related to the MPL-B420P-RK74AA and are useful alternatives for comparison.
| Model | Feedback | Shaft | Brake | Rated Speed | Continuous Torque | Peak Torque | Rated Power | Frame |
|---|---|---|---|---|---|---|---|---|
| MPL-B420P-RK72AA | Resolver | Keyless | 24 V DC | 5000 RPM | 4.74 N·m | 13.5 N·m | 1.9 kW | 115 mm |
| MPL-B420P-RJ74AA | Resolver | Keyed | 24 V DC | 5000 RPM | 4.74 N·m | 13.5 N·m | 1.9 kW | 115 mm |
| MPL-B420P-RJ72AA | Resolver | Keyed | 24 V DC | 5000 RPM | 4.74 N·m | 13.5 N·m | 1.9 kW | 115 mm |
| MPL-B420P-MK74AA | Multi-turn high-resolution encoder | Keyless | 24 V DC | 5000 RPM | 4.74 N·m | 13.5 N·m | 1.9 kW | 115 mm |
| MPL-B420P-MJ74AA | Multi-turn high-resolution encoder | Keyed | 24 V DC | 5000 RPM | 4.74 N·m | 13.5 N·m | 1.9 kW | 115 mm |
These models are closely related because they share the same basic B420P motor platform.
The major differences are generally associated with feedback type and shaft configuration.
For example, the MPL-B420P-RK74AA and MPL-B420P-RJ74AA are both resolver-based motors, but the RK version uses a keyless shaft while the RJ version uses a keyed shaft.
The MPL-B420P-MK74AA uses a high-resolution multi-turn encoder rather than resolver feedback, making it a different feedback configuration even though the motor’s basic power and speed class are similar.
Related Model Comparison
| Model | Voltage | Speed | Continuous Torque | Peak Torque | Power | Feedback | Shaft | Brake | Approx. Weight |
|---|---|---|---|---|---|---|---|---|---|
| MPL-B420P-RK74AA | 460 V | 5000 RPM | 4.74 N·m | 13.5 N·m | 1.9 kW | Resolver | Keyless | 24 V DC | 4.3 kg |
| MPL-B420P-RK72AA | 460 V | 5000 RPM | 4.74 N·m | 13.5 N·m | 1.9 kW | Resolver | Keyless | 24 V DC | Approx. 4.3 kg |
| MPL-B420P-RJ74AA | 460 V | 5000 RPM | 4.74 N·m | 13.5 N·m | 1.9 kW | Resolver | Keyed | 24 V DC | Approx. 4.3 kg |
| MPL-B420P-RJ72AA | 460 V | 5000 RPM | 4.74 N·m | 13.5 N·m | 1.9 kW | Resolver | Keyed | 24 V DC | Approx. 4.3 kg |
| MPL-B420P-MK74AA | 460 V | 5000 RPM | 4.74 N·m | 13.5 N·m | 1.9 kW | Multi-turn Encoder | Keyless | 24 V DC | Approx. 4.3 kg |
| MPL-B420P-MJ74AA | 460 V | 5000 RPM | 4.74 N·m | 13.5 N·m | 1.9 kW | Multi-turn Encoder | Keyed | 24 V DC | Approx. 4.3 kg |
Five Popular Allen-Bradley Models for Comparison
The following five models are useful products to compare when selecting a servo motor within the same general Allen-Bradley motion-control range.
| Model | Series | Voltage | Rated Speed | Continuous Torque | Peak Torque | Power | Feedback | Frame |
|---|---|---|---|---|---|---|---|---|
| MPL-B320P-SK74AA | MP-Series MPL | 460 V | 5000 RPM | 3.05 N·m | 7.91 N·m | 1.5 kW | High-resolution encoder | 115 mm class |
| MPL-B330P-SK74AA | MP-Series MPL | 460 V | 5000 RPM | 4.18 N·m | 11.1 N·m | 1.8 kW | High-resolution encoder | 115 mm class |
| MPL-B420P-SK74AA | MP-Series MPL | 460 V | 5000 RPM | 4.74 N·m | 13.5 N·m | 1.9 kW | High-resolution encoder | 115 mm |
| MPL-B430H-SJ74AA | MP-Series MPL | 460 V | 5000 RPM | Approx. 6.55 N·m class | Approx. 19.8 N·m class | Approx. 2.2 kW class | High-resolution feedback | 115 mm class |
| MPL-B430P-SJ74AA | MP-Series MPL | 460 V | 5000 RPM | 6.55 N·m | 19.8 N·m | 2.2 kW | High-resolution encoder | 115 mm class |
These models cover a useful range of motor capacity.
The MPL-B320P is a smaller-output option, while the MPL-B330P provides a step upward in torque and power. The B420P sits between the smaller B-series motors and the higher-output B430P models.
For applications requiring more torque than the B420P can provide, the B430P family is a logical model class to investigate.
Popular Model Parameter Comparison
| Model | Rated Power | Continuous Torque | Peak Torque | Speed | Feedback | Approx. Weight | Approx. Frame |
|---|---|---|---|---|---|---|---|
| MPL-B320P-SK74AA | 1.5 kW | 3.05 N·m | 7.91 N·m | 5000 RPM | High-resolution | Approx. 3.7 kg | 115 mm class |
| MPL-B330P-SK74AA | 1.8 kW | 4.18 N·m | 11.1 N·m | 5000 RPM | High-resolution | Approx. 4.6 kg | 115 mm class |
| MPL-B420P-RK74AA | 1.9 kW | 4.74 N·m | 13.5 N·m | 5000 RPM | Resolver | Approx. 4.3 kg | 115 mm |
| MPL-B430H-SJ74AA | Approx. 2.2 kW class | Approx. 6.55 N·m class | Approx. 19.8 N·m class | 5000 RPM | High-resolution | Approx. 5.5 kg class | 115 mm class |
| MPL-B430P-SJ74AA | 2.2 kW | 6.55 N·m | 19.8 N·m | 5000 RPM | High-resolution | Approx. 5.5 kg | 115 mm |
The B420P is a good middle point within this group because it offers more continuous and peak torque than the B320P and B330P while maintaining the same general 5000 RPM high-speed concept.
MPL-B420P-RK74AA vs. Similar Models
| Feature | MPL-B420P-RK74AA | MPL-B420P-RJ74AA | MPL-B420P-MK74AA |
|---|---|---|---|
| Series | MPL | MPL | MPL |
| Voltage | 460 V | 460 V | 460 V |
| Power | 1.9 kW | 1.9 kW | 1.9 kW |
| Speed | 5000 RPM | 5000 RPM | 5000 RPM |
| Continuous Torque | 4.74 N·m | 4.74 N·m | 4.74 N·m |
| Peak Torque | 13.5 N·m | 13.5 N·m | 13.5 N·m |
| Feedback | Resolver | Resolver | Multi-turn high-resolution |
| Shaft | Keyless | Keyed | Keyless |
| Brake | 24 V DC | 24 V DC | 24 V DC |
| Frame | 115 mm | 115 mm | 115 mm |
| Stack | 50.8 mm | 50.8 mm | 50.8 mm |
| IP Rating | IP66 | IP66 class | IP66 class |
| Approx. Weight | 4.3 kg | Approx. 4.3 kg | Approx. 4.3 kg |
The most important difference between these motors is not necessarily their power rating. In many cases, the feedback and shaft configuration are the deciding factors.
For an existing machine using resolver feedback and a keyless shaft, the MPL-B420P-RK74AA is a more natural match than an encoder-based or keyed-shaft alternative.
Application Selection Guide
| Application Requirement | Recommended Consideration |
|---|---|
| High-speed rotary motion | MPL-B420P-RK74AA |
| 5000 RPM operation | MPL-B420P-RK74AA |
| Around 4.7 N·m continuous torque | MPL-B420P-RK74AA |
| Resolver-based system | MPL-B420P-RK74AA |
| Keyless mechanical coupling | MPL-B420P-RK74AA |
| Vertical axis | MPL-B420P-RK74AA with brake |
| High-cycle packaging | MPL-B420P-RK74AA |
| Fast indexing | MPL-B420P-RK74AA |
| Moderate-to-high dynamic acceleration | MPL-B420P-RK74AA |
| Higher torque requirement | Consider B430P-class models |
| Smaller torque requirement | Consider B320P/B330P-class models |
| Absolute multi-turn feedback | Consider MK/MJ configurations |
Installation Considerations
When installing an MPL-B420P-RK74AA, the motor should be treated as part of a complete servo system rather than as an isolated component.
The servo drive must be compatible with the motor’s voltage, current, feedback system, and motor configuration.
The resolver wiring must be correctly connected to the corresponding feedback interface.
The motor power cable must also be correctly sized for the application and installed in a manner that minimizes electrical interference.
Mechanical alignment is equally important.
The motor shaft should be properly aligned with the driven mechanism. Excessive radial or axial shaft loading can reduce bearing life and affect servo performance.
The mounting surface should be rigid and accurately machined.
Because the motor weighs approximately 4.3 kg, the supporting structure should also be designed to prevent vibration or movement during acceleration and deceleration.
Maintenance Considerations
The MPL-B420P-RK74AA is designed for industrial service, but correct maintenance remains important.
The motor should be inspected periodically for:
- Cable damage
- Connector damage
- Excessive vibration
- Abnormal bearing noise
- Excessive motor temperature
- Mounting bolt looseness
- Shaft coupling problems
- Contamination around the motor
- Brake operation
- Feedback errors
The IP66 housing helps protect the motor from environmental contamination, but IP66 protection does not mean the motor can be exposed indefinitely to every industrial cleaning chemical or operating condition.
The motor’s cooling and ventilation conditions should also be considered.
Replacement and Compatibility
When replacing an existing servo motor with an MPL-B420P-RK74AA, it is important to compare the complete model number rather than comparing only power and torque.
The following characteristics should be checked:
| Replacement Item | What Should Be Checked |
|---|---|
| Voltage | 460 V class |
| Power | 1.9 kW |
| Continuous Torque | 4.74 N·m |
| Peak Torque | 13.5 N·m |
| Speed | 5000 RPM |
| Feedback | Resolver |
| Shaft | Keyless |
| Brake | 24 V DC |
| Frame | 115 mm |
| Stack | 50.8 mm |
| Connector | Right-angle DIN |
| Protection | IP66 |
| Mounting | IEC Metric |
| Weight | Approximately 4.3 kg |
| Mechanical Dimensions | Verify against machine drawing |
A motor with the same rated power is not necessarily a direct replacement.
For example, changing from resolver feedback to a different encoder system may require changes to the drive, feedback cable, controller configuration, and commissioning parameters.
Likewise, replacing the keyless shaft with a keyed shaft may require a different coupling.
Overall Advantages of MPL-B420P-RK74AA
The MPL-B420P-RK74AA provides a strong combination of speed, torque, dynamic response, feedback reliability, mechanical flexibility, and environmental protection.
Its major advantages can be summarized as follows:
- 5000 RPM high-speed operation
- 4.74 N·m continuous torque
- 13.5 N·m peak torque capability
- 1.9 kW rated power
- Low-inertia servo construction
- Resolver feedback
- Keyless shaft design
- Integral 24 V DC brake
- IP66 housing
- 115 mm IEC metric frame
- 50.8 mm magnet stack
- Right-angle connector
- 180-degree connector rotation
- Suitable for high-cycle automation
- Suitable for vertical-axis applications
- Good balance between speed and torque
- Useful for compact machine designs
- Well suited to demanding industrial motion applications
Final Product Summary
The MPL-B420P-RK74AA is a 1.9 kW, 460 V class, 5000 RPM low-inertia rotary servo motor belonging to the Allen-Bradley MP-Series MPL family.
Its 4.74 N·m continuous torque and approximately 13.5 N·m peak torque give it a useful balance of continuous load capability and dynamic acceleration performance.
The 115 mm frame and 50.8 mm stack provide a relatively compact mechanical package for the available output performance.
The resolver feedback system makes the motor particularly suitable for motion systems designed around resolver feedback, while the keyless shaft provides a specific mechanical configuration for compatible couplings.
The integral 24 V DC brake adds value for vertical positioning and load-holding applications.
Its IP66 protection, 5000 RPM operating speed, low-inertia construction, flexible right-angle connector, and industrial mounting configuration make it a versatile choice for automated machinery.
For packaging machines, assembly equipment, material handling systems, indexing equipment, pick-and-place machines, vertical axes, and other industrial automation applications, the MPL-B420P-RK74AA can provide a strong combination of speed, torque, positioning capability, and mechanical flexibility.
The most important point when selecting this motor is to evaluate the complete model configuration, not just the motor’s power rating. Feedback type, shaft configuration, brake option, mounting dimensions, connector arrangement, and drive compatibility all play an important role in determining whether the motor is appropriate for a particular machine.