Introduction

The MPL-A420P-MK74AA belongs to Allen-Bradley's MP-Series MPL low-inertia servo motor family. It is designed for applications where a combination of speed, torque response, positioning accuracy, and compact machine integration is required.

The A420P configuration uses a 115 mm frame and 50.8 mm magnet stack, providing a useful balance between motor size and motion performance. Its 5000 RPM capability makes it suitable for high-cycle machinery, while the multi-turn absolute feedback system provides detailed position information for closed-loop servo control.

Another important feature is the integrated 24 V DC holding brake. This can be advantageous for vertical or mechanically sensitive axes where maintaining position during a controlled stop or power-off condition is necessary.

The keyless shaft and metric flange mounting arrangement also make the motor practical for modern machine designs. Combined with the rotatable right-angle SpeedTEC DIN connector, the motor can be installed in equipment where cable routing and available mounting space are important considerations.

Technical Specifications

Specification	Details
Brand	Allen-Bradley
Series	MP-Series MPL
Model	MPL-A420P-MK74AA
Product Type	Low-Inertia Rotary Servo Motor
Voltage Class	230 V AC
Frame Size	115 mm
Magnet Stack Length	50.8 mm
Maximum Speed	5000 RPM
Continuous Torque	4.74 N·m
Feedback	Multi-turn High-Resolution Absolute Encoder
Feedback Resolution	1024 Sin/Cos cycles/rev
Feedback Protocol	Hiperface
Shaft Type	Keyless Shaft Extension
Brake	24 V DC Holding Brake
Connector	SpeedTEC DIN, Right-Angle
Connector Adjustment	180° Rotatable
Mounting	IEC Metric, Free Mounting Holes
Motor Construction	Low-Inertia Brushless AC
Frame Mounting	Metric Flange
Weight	4.30 kg (9.48 lb)

Mechanical integration note: The 115 mm frame designation identifies the motor's frame size. The complete mechanical installation should be checked against the applicable mounting pattern, shaft coupling, available clearance, connector orientation, and driven-load requirements.

Recommended Related Models

For applications requiring similar MP-Series MPL characteristics, the following models are worth considering:

Allen-Bradley MPL-A420P-MK72AA — closely related 230 V class low-inertia servo motor configuration.
Allen-Bradley MPL-A420P-MJ74AA — similar A420P motor configuration with keyed shaft arrangement.
Allen-Bradley MPL-A420P-MJ72AA — related 115 mm frame, 50.8 mm magnet stack servo motor.
Allen-Bradley MPL-A430P-MK74AA — higher magnet-stack configuration for applications requiring greater motor output.

Popular Related Models

Allen-Bradley MPL-A420P-MK72AA
Allen-Bradley MPL-A420P-MJ72AA
Allen-Bradley MPL-A420P-MJ74AA
Allen-Bradley MPL-A430P-MK72AA
Allen-Bradley MPL-A430P-MK74AA
Allen-Bradley MPL-B420P-MK74AA

The MPL-A420P-MK74AA is a strong choice for compact, high-speed servo axes where low inertia, absolute multi-turn feedback, braking capability, and flexible machine integration are all important.

Applications

The MPL-A420P-MK74AA can be used in motion systems where accurate positioning and dynamic motor response are important.

Typical applications include:

Packaging and filling machinery
Material handling equipment
Automated assembly machines
Printing and converting equipment
Semiconductor and electronic manufacturing machinery
CNC and precision positioning equipment
Pick-and-place systems
Web handling and indexing applications
Robotic machine axes
High-speed automated production lines

Its low-inertia rotor characteristics make it particularly useful for applications involving frequent acceleration, deceleration, indexing, and direction changes.

Advantages

Low-inertia motion performance
The MPL-A420P series is designed to respond quickly to changes in commanded speed and position, helping motion systems achieve shorter acceleration and settling times.

5000 RPM capability
The motor supports a maximum speed of 5000 RPM, providing the speed range required by many high-cycle automation applications.

High-resolution absolute feedback
The multi-turn absolute encoder provides position feedback without relying solely on incremental position counting. This is valuable for applications where repeatable positioning is critical.

Integrated 24 V DC brake
The MPL-A420P-MK74AA includes a 24 V DC holding brake, which can help maintain the motor position when power is removed or when the axis requires additional holding capability.

Keyless shaft design
The keyless shaft extension allows the motor to be integrated with compatible mechanical components without a traditional shaft key arrangement.

Flexible connector orientation
The right-angle SpeedTEC DIN connector can be rotated, providing additional flexibility when routing motor and feedback cables inside compact machine enclosures.

Metric mounting configuration
The IEC metric mounting arrangement and free mounting holes simplify integration with international machine designs.

Technical FAQs

1. What type of motor is the MPL-A420P-MK74AA?
It is a low-inertia brushless AC rotary servo motor from the Allen-Bradley MP-Series MPL family.

2. What is the operating voltage of the MPL-A420P-MK74AA?
The motor is designed for the 230 V AC class and is commonly used with compatible Allen-Bradley Kinetix servo drive systems.

3. What is the maximum speed of this servo motor?
The specified maximum speed is 5000 RPM.

4. What type of feedback does the MPL-A420P-MK74AA use?
It uses a multi-turn, high-resolution absolute encoder with 1024 Sin/Cos cycles per revolution and Hiperface feedback technology.

5. Does the MPL-A420P-MK74AA have a holding brake?
Yes. This model incorporates a 24 V DC holding brake.

6. Is the motor shaft keyed?
No. The MPL-A420P-MK74AA uses a keyless shaft extension.

7. What is the magnet stack length?
The motor uses a 50.8 mm magnet stack, corresponding to the MPL-A420P frame 4 configuration.

8. What continuous torque is associated with the MPL-A420P motor family?
The MPL-A420P family is rated at approximately 4.74 N·m continuous torque. Actual system performance depends on the selected servo drive, operating conditions, and motion profile.

9. Which Allen-Bradley drive families can be used with this motor?
The motor is intended for integration with compatible Allen-Bradley motion control systems, including Kinetix servo drive platforms. Drive and motor compatibility should be checked against the complete catalog configuration before commissioning.

10. What should be checked before commissioning the motor?
Verify motor and drive compatibility, feedback configuration, brake wiring, connector connections, grounding, mechanical coupling, axis direction, and servo tuning parameters before enabling normal operation.

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