Introduction

The MPL-A420P-SK72AA represents a compact, high-performance servo motor configuration within the Allen-Bradley MP-Series MPL family. It is intended for closed-loop industrial motion applications where positioning accuracy and dynamic response are more important than simply delivering continuous rotary power.

Its 115 mm frame and 50.8 mm magnet stack provide a compact mechanical platform, while the 5000 RPM maximum speed makes the motor suitable for relatively fast machine axes. The low-inertia construction allows the motor to react quickly to control commands, which can help improve cycle performance in automated equipment.

A single-turn high-resolution encoder provides the feedback required for precise servo control. The encoder's 1024 Sin/Cos cycles-per-revolution configuration gives the control system detailed rotor-position information, supporting accurate speed and position regulation.

Unlike brake-equipped variants, the MPL-A420P-SK72AA uses a keyless shaft and no integrated brake. This configuration can be advantageous when the application already provides its own mechanical holding arrangement or does not require motor-mounted braking.

The right-angle SpeedTEC DIN connector further improves installation flexibility. Its rotatable configuration can make cable routing easier when the motor is installed in compact machine frames or enclosed motion assemblies.

Technical Specifications

Specification	Details
Brand	Allen-Bradley
Product Family	MP-Series MPL
Model	MPL-A420P-SK72AA
Product Type	Low-Inertia Brushless AC Rotary Servo Motor
Voltage	230 V AC
Voltage Class	200 V Class
Frame Size	115 mm
Magnet Stack Length	50.8 mm
Maximum Speed	5000 RPM
Feedback	Single-Turn High-Resolution Encoder
Feedback Resolution	1024 Sin/Cos cycles/rev
Feedback Protocol	Hiperface
Shaft Configuration	Keyless Shaft Extension
Brake	No Integrated Brake
Connector	SpeedTEC DIN, Right Angle
Connector Rotation	180° Rotatable
Mounting	IEC Metric, Free Mounting Holes
Motor Type	Brushless AC Servo
Weight	4.30 kg (9.48 lb)

Recommended Related Models

For machine designs requiring similar MP-Series MPL characteristics, these models are useful related configurations:

Allen-Bradley MPL-A420P-SJ72AA — closely related 115 mm frame servo motor with single-turn high-resolution feedback.
Allen-Bradley MPL-A420P-SJ74AA — related single-turn feedback configuration with a keyed shaft and brake.
Allen-Bradley MPL-A420P-MK72AA — similar A420P motor with multi-turn high-resolution absolute feedback and keyless shaft.
Allen-Bradley MPL-A420P-MK74AA — related A420P configuration combining multi-turn feedback and keyless shaft characteristics.

Popular Related Models

Allen-Bradley MPL-A420P-SJ72AA
Allen-Bradley MPL-A420P-SJ74AA
Allen-Bradley MPL-A420P-MJ72AA
Allen-Bradley MPL-A420P-MJ74AA
Allen-Bradley MPL-A420P-MK72AA
Allen-Bradley MPL-A420P-MK74AA

Applications

The MPL-A420P-SK72AA can be applied to a wide range of automated motion systems, particularly those requiring repeatable positioning and fast servo response.

Typical applications include:

Packaging and filling machinery
Automated assembly equipment
Pick-and-place systems
Material handling machines
Printing and converting equipment
Precision indexing machinery
Electronic manufacturing equipment
Machine tools
Automated inspection systems
High-speed production lines
Rotary positioning axes
General industrial motion applications

Its low-inertia characteristics are especially useful for axes that frequently accelerate, decelerate, stop, and reposition.

Advantages

Responsive low-inertia performance
The MPL-A420P-SK72AA is designed for dynamic motion applications where rapid response to changing speed and position commands is important.

5000 RPM maximum speed
The motor provides a high-speed operating range suitable for high-cycle machinery and applications requiring rapid rotary movement.

High-resolution single-turn feedback
Its single-turn high-resolution encoder provides detailed position information for closed-loop servo control and repeatable machine operation.

Keyless shaft configuration
The keyless shaft provides a clean mechanical interface for compatible couplings and driven components, making it suitable for various machine transmission arrangements.

Compact 115 mm frame
The 115 mm frame size offers a useful combination of motor performance and installation efficiency, particularly where machine space is limited.

Flexible connector orientation
The right-angle SpeedTEC DIN connector can be rotated through 180°, helping accommodate different cabinet layouts and cable-routing requirements.

Industrial metric mounting
The IEC metric mounting arrangement supports integration into a broad range of international machine designs.

Technical FAQs

1. What type of servo motor is the MPL-A420P-SK72AA?
It is a low-inertia brushless AC rotary servo motor belonging to the Allen-Bradley MP-Series MPL family.

2. What voltage class is the MPL-A420P-SK72AA designed for?
The motor belongs to the 230 V AC / 200 V class and is intended to operate with compatible Allen-Bradley servo drive systems.

3. What is the maximum speed of this motor?
The MPL-A420P-SK72AA supports a maximum speed of 5000 RPM.

4. What feedback system does the MPL-A420P-SK72AA use?
This configuration uses a single-turn high-resolution encoder for position feedback, with 1024 Sin/Cos cycles per revolution and Hiperface protocol.

5. Does the MPL-A420P-SK72AA have an integrated brake?
This model is configured without an integrated holding brake.

6. Does the motor use a keyed shaft?
No. The MPL-A420P-SK72AA uses a keyless shaft extension.

7. What is the magnet stack length of this servo motor?
The motor uses a 50.8 mm magnet stack, corresponding to the 20 stack-length configuration in the MPL-A420P family.

8. What is the purpose of the low-inertia rotor design?
Low rotor inertia allows the motor to respond quickly to changes in commanded motion. This is particularly valuable for indexing, rapid positioning, and applications involving frequent acceleration and deceleration.

9. What connector is used on the MPL-A420P-SK72AA?
It uses a right-angle SpeedTEC DIN connector. The connector can be rotated 180° to provide greater flexibility for motor and feedback cable routing.

10. What should be checked before commissioning this servo motor?
Verify motor and drive compatibility, feedback configuration, wiring, grounding, mechanical coupling, shaft alignment, load requirements, and servo tuning parameters before normal operation.

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