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MPL-B330P-SJ74AA Low-Inertia Servo Motor

1. Product Overview

The MPL-B330P-SJ74AA is a high-speed, low-inertia brushless AC rotary servo motor designed for industrial automation, precision positioning, indexing, and high-performance motion-control applications.

It belongs to the MP-Series MPL low-inertia servo motor family and uses a 460 V class motor configuration, a 100 mm frame, and a 76.2 mm magnet stack. The motor has a rated speed of 5000 RPM and is configured with a single-turn high-resolution encoder, keyed shaft extension, right-angle SpeedTEC DIN connector, and integrated 24 V DC holding brake.

The B330P motor class is rated at approximately 1.8 kW, with 4.18 Nm continuous stall torque and approximately 11.1 Nm peak torque. The rotor inertia is approximately 0.00012 kg·m², making it suitable for applications that require repeated acceleration, deceleration, and rapid changes in rotational speed.

The SJ74AA configuration is especially useful when a machine requires both a conventional keyed shaft and a motor-mounted 24 V DC holding brake. The brake distinguishes this model from the closely related SJ72AA no-brake configuration.

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2. Brand and Product Classification

Item	Specification
Brand	Allen-Bradley
Product Family	MP-Series Servo Motors
Product Series	MPL Low-Inertia Servo Motors
Motor Type	Brushless AC Rotary Servo Motor
Model	MPL-B330P-SJ74AA
Voltage Class	460 V AC
Rated Speed	5000 RPM
Feedback	Single-turn high-resolution encoder
Shaft	Keyed shaft extension
Brake	24 V DC holding brake
Connector	SpeedTEC DIN
Connector Configuration	Right-angle
Connector Rotation	180° rotatable
Mounting	IEC Metric
Frame Size	100 mm
Magnet Stack	76.2 mm
Rated Output	Approximately 1.8 kW
Continuous Stall Torque	4.18 Nm
Peak Torque	Approximately 11.1 Nm
Rotor Inertia	Approximately 0.00012 kg·m²
Approx. Weight	Approximately 5.3–6.5 kg depending on published configuration data
Main Application	Industrial servo motion control

The exact product configuration identifies the motor as a 460 V, 100 mm frame, 76.2 mm stack, 5000 RPM servo motor with a single-turn high-resolution encoder, keyed shaft, right-angle rotatable connector, and 24 V DC brake.

Published product listings give somewhat different shipping/configuration weights. One listing reports approximately 11.73 lb, or about 5.32 kg, while another lists approximately 6.48 kg. For engineering documentation, the exact mechanical drawing and product revision should be used for the final installed weight.

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3. Product Series

The MPL-B330P-SJ74AA belongs to the following product hierarchy:

MP-Series → MPL Series → Low-Inertia Brushless Servo Motors → B330P Motor Class → SJ74AA Configuration

The MPL series was designed for high-performance motion systems where relatively compact servo motors are required to deliver high speed, controlled torque, and rapid dynamic response.

The B330P class occupies a medium-to-high torque position within the 5000 RPM MPL motor range.

The family includes smaller B310P and B320P motors as well as larger B420P and B430P configurations. This allows the motor size to be selected according to continuous torque, peak torque, machine inertia, speed, and physical installation requirements.

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4. Model Number Explanation

The model number MPL-B330P-SJ74AA contains configuration information that identifies the motor’s major characteristics.

Model Section	Description
MPL	MPL low-inertia servo motor family
B	460 V class motor family
330	B330 motor size / electromagnetic configuration
P	5000 RPM speed class
S	Single-turn high-resolution encoder
J	Keyed shaft extension
7	Right-angle SpeedTEC DIN connector, 180° rotatable
4	24 V DC brake
AA	Product configuration / revision designation

The exact configuration data identifies the feedback as a single-turn high-resolution encoder, the shaft as keyed, the connector as a right-angle SpeedTEC DIN type, and the brake as a 24 V DC configuration.

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5. Detailed Technical Specifications

Parameter	Specification
Model	MPL-B330P-SJ74AA
Brand	Allen-Bradley
Product Series	MP-Series MPL
Motor Type	Low-Inertia Brushless AC Servo Motor
Armature Voltage	460 V AC
Voltage Class	400/460 V class
Rated Speed	5000 RPM
Rated Output	Approximately 1.8 kW
Continuous Stall Torque	4.18 Nm
Peak Torque	Approximately 11.1 Nm
Rotor Inertia	0.00012 kg·m²
Feedback	Single-turn high-resolution encoder
Feedback Type	1024 Sin/Cos
Feedback Protocol	Hiperface
Shaft	Keyed shaft extension
Shaft Seal	No shaft seal in the standard configuration
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
Frame Size	100 mm
Frame Size, Imperial	3.94 in.
Magnet Stack	76.2 mm
Magnet Stack, Imperial	3.0 in.
Approx. Weight	5.3–6.5 kg depending on configuration/reference
Primary Application	Servo motion control

The published selection data gives the B330P class a 5000 RPM speed rating, 4.18 Nm continuous torque, 11.1 Nm peak torque, 1.8 kW output, 0.00012 kg·m² rotor inertia, and approximately 4.6 kg for the generic B330P motor family. Exact brake, connector, and other hardware configurations can result in a different complete-motor weight.

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6. Dimensions and Mechanical Parameters

The motor uses a 100 mm frame size and a 76.2 mm magnet stack length.

The 100 mm frame is approximately 3.94 inches, while the 76.2 mm magnet stack is exactly 3.0 inches.

The frame and stack dimensions describe the principal motor configuration. They should not be interpreted as the complete external envelope because the actual motor length, shaft projection, connector clearance, and mounting details depend on the exact mechanical drawing.

Mechanical Parameter	Specification
Model	MPL-B330P-SJ74AA
Frame Size	100 mm
Frame Size, Imperial	3.94 in.
Magnet Stack Length	76.2 mm
Magnet Stack Length, Imperial	3.0 in.
Shaft Type	Keyed
Shaft Extension	Keyed shaft
Shaft Seal	No shaft seal
Mounting Standard	IEC Metric
Mounting Hole Type	Free Mounting Holes, Type FF
Connector	SpeedTEC DIN
Connector Style	Right-angle
Connector Rotation	180°
Brake	24 V DC
Approx. Weight	Approximately 5.3–6.5 kg

The official product description identifies the frame as 100 mm and the stack as 76.2 mm, while also specifying IEC metric mounting and free mounting holes of Type FF.

For machine construction, the complete dimensional drawing should be used to establish the actual mounting-hole positions, flange dimensions, shaft extension, motor length, connector clearance, and cable-routing area.

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7. Motor Performance

The B330P motor class is designed for relatively high-speed operation.

Its rated speed is 5000 RPM, which makes it suitable for machines where the motor must repeatedly accelerate to high rotational speed and then decelerate or reverse.

The motor provides approximately 4.18 Nm continuous stall torque and 11.1 Nm peak torque.

The continuous torque value represents the motor’s sustained torque capability under the applicable operating conditions, while the peak torque capability is intended for short-duration dynamic requirements such as acceleration, deceleration, or transient load conditions.

The exact torque available at a particular operating speed should be determined from the motor’s speed-torque characteristics rather than assuming that the full stall torque is available throughout the speed range.

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8. Rated Power

The B330P motor is approximately a 1.8 kW servo motor.

The combination of 1.8 kW power, 4.18 Nm continuous stall torque, 11.1 Nm peak torque, and 5000 RPM makes the B330P useful for medium-duty high-speed servo applications.

Performance Parameter	Value
Rated Speed	5000 RPM
Rated Output	Approximately 1.8 kW
Continuous Stall Torque	4.18 Nm
Peak Torque	11.1 Nm
Rotor Inertia	0.00012 kg·m²
Frame	100 mm
Magnet Stack	76.2 mm

The published B-series technical data places the B330P at 1.8 kW and 4.18 Nm continuous torque, with 11.1 Nm peak torque available in the appropriate drive configuration.

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9. Low-Inertia Design

One of the major characteristics of the MPL series is its low-inertia rotor design.

The B330P rotor inertia is approximately 0.00012 kg·m².

A low rotor inertia reduces the torque required to accelerate the motor rotor itself.

This can improve dynamic response when the machine performs frequent starts, stops, reversals, and speed changes.

Typical applications include packaging machines, indexing equipment, automated assembly systems, electronic manufacturing equipment, and high-speed material handling machinery.

The low-inertia design is especially useful when the machine load is properly matched to the motor and the servo drive is correctly tuned.

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10. Single-Turn High-Resolution Encoder

The SJ74AA configuration uses a single-turn high-resolution encoder.

The published specifications identify the feedback as a 1024 Sin/Cos absolute single-turn encoder using Hiperface protocol.

The encoder provides the servo drive with position feedback for closed-loop control.

The feedback system allows the drive to monitor motor position and speed and to regulate motor torque according to the programmed motion profile.

The single-turn configuration is appropriate for applications where the control architecture uses motor position within a single revolution and does not require the motor itself to maintain absolute multi-turn position information.

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11. Keyed Shaft Extension

The J designation indicates the keyed shaft configuration.

A keyed shaft is useful for mechanical systems using conventional keyed couplings, pulleys, gears, sprockets, or other keyed transmission components.

Shaft Parameter	Specification
Model	MPL-B330P-SJ74AA
Shaft Type	Keyed
Shaft Key	Yes
Shaft Seal	No shaft seal
Mechanical Interface	Keyed coupling / transmission
Typical Application	Rotary transmission and positioning

The shaft and coupling should be selected according to the actual radial load, axial load, speed, acceleration, shaft alignment, and mechanical duty cycle.

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12. Integrated 24 V DC Brake

The most important configuration feature distinguishing the SJ74AA from the closely related SJ72AA is the integrated 24 V DC holding brake.

The brake is intended primarily to hold the motor shaft when servo torque is removed.

This can be useful in applications where the axis must remain mechanically restrained while the servo drive is disabled.

Typical applications include vertical mechanisms, positioning equipment, indexing systems, and machines that require a holding function during controlled stops.

Brake Parameter	Specification
Model	MPL-B330P-SJ74AA
Brake Type	Holding Brake
Brake Voltage	24 V DC
Brake Configuration	Integrated
Primary Function	Shaft holding
Typical Applications	Vertical axes, holding and positioning
Dynamic Stopping	Servo system / machine braking function

The official configuration identifies the brake option as a 24 V DC brake.

The holding brake should not be considered a replacement for a safety-rated stopping or guarding system. Machine safety functions must be designed separately according to the application.

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13. SpeedTEC DIN Connector

The motor uses a SpeedTEC DIN right-angle connector.

The connector can be rotated approximately 180°, allowing the cable exit direction to be adjusted to the machine layout.

This is useful when the motor is installed close to machine frames, protective guards, gearboxes, linear slides, or other components.

Connector Parameter	Specification
Connector Type	SpeedTEC DIN
Configuration	Right-angle
Rotation	180°
Connection	Quick-connect type
Primary Benefit	Flexible cable routing

The official product configuration specifically identifies the connector as a right-angle SpeedTEC DIN connector with 180° rotational capability.

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14. Product Applications

Packaging Machinery

Packaging equipment often requires high-speed repetitive movement.

The MPL-B330P-SJ74AA can be used for feeding, indexing, cutting, sealing, positioning, and synchronization mechanisms.

The 5000 RPM speed capability can help support high-cycle machine operation when the mechanical transmission is properly selected.

The integrated brake can also be useful where an axis must be held after the servo has stopped.

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Material Handling

The motor can be used in automated material transfer and positioning systems.

Typical examples include conveyor positioning, transfer mechanisms, rotary tables, indexing equipment, and automated handling systems.

The encoder provides closed-loop position feedback for controlled motion.

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Machine Tools

The motor can be considered for controlled feed axes, auxiliary rotary axes, indexing mechanisms, and other machine-tool motion applications.

The keyed shaft is suitable for machines that use conventional keyed transmission components.

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Automated Assembly

Assembly machines often require repeated and accurately controlled motion.

The B330P motor can be applied to rotary indexing units, transfer mechanisms, positioning stations, feeders, and automated production equipment.

Its low-inertia rotor is particularly useful where the machine repeatedly accelerates and decelerates.

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Electronic Manufacturing

Electronics production equipment frequently requires precise and repeatable servo motion.

Potential applications include component handling, indexing, positioning, inspection mechanisms, and automated assembly.

The single-turn high-resolution encoder provides the feedback needed for closed-loop motion control.

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Printing and Converting

Printing and converting machinery often uses multiple synchronized axes.

Servo motors can control rollers, feeders, cutters, registration systems, and other rotating mechanisms.

The high-speed capability of the B330P makes it suitable for applications where the motor operates at relatively high rotational speeds.

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Metal Forming and Industrial Machinery

Servo-controlled motion can be used for feeding, indexing, positioning, and auxiliary mechanisms in industrial machinery.

The motor’s combination of high speed and peak torque makes it useful where machine cycles include frequent acceleration and deceleration.

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15. Main Product Advantages

15.1 High-Speed 5000 RPM Operation

The motor has a rated speed of 5000 RPM.

This allows the motor to support high-speed rotary applications and rapid machine cycles when the load and transmission are appropriately selected.

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15.2 Low Rotor Inertia

The approximately 0.00012 kg·m² rotor inertia supports fast acceleration and deceleration.

This characteristic is particularly valuable in machines with frequent starts, stops, reversals, and indexing operations.

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15.3 1.8 kW Output

The 1.8 kW motor rating provides a useful level of continuous power for medium-duty servo axes.

It is larger than the B310P and B320P classes in terms of torque capacity while remaining smaller than the B420P and B430P classes.

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15.4 4.18 Nm Continuous Torque

The motor provides approximately 4.18 Nm continuous stall torque.

This makes it suitable for applications requiring sustained servo torque rather than only short-duration peak performance.

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15.5 11.1 Nm Peak Torque

The approximately 11.1 Nm peak torque capability provides additional dynamic capacity for acceleration, deceleration, and short-duration transient loads.

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15.6 Integrated 24 V DC Brake

The built-in 24 V DC holding brake is one of the main advantages of the SJ74AA configuration.

It eliminates the need to select a completely separate motor brake assembly when the application requires motor-mounted holding capability.

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15.7 Single-Turn High-Resolution Feedback

The high-resolution single-turn encoder provides detailed motor position feedback for closed-loop servo control.

This supports accurate positioning and controlled velocity operation.

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15.8 Keyed Shaft

The keyed shaft provides compatibility with conventional keyed mechanical couplings and transmission components.

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15.9 Flexible Connector Orientation

The right-angle connector and approximately 180° rotational adjustment provide greater flexibility when routing motor cables.

This can simplify installation in compact machines.

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15.10 Compact 100 mm Frame

The 100 mm frame provides a relatively compact mechanical package for a motor in the 1.8 kW / 4.18 Nm performance class.

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16. Detailed Electrical and Mechanical Parameter Table

Category	Parameter	Specification
Electrical	Armature Voltage	460 V AC
Electrical	Rated Power	1.8 kW
Electrical	Rated Speed	5000 RPM
Electrical	Continuous Stall Torque	4.18 Nm
Electrical	Peak Torque	11.1 Nm
Feedback	Type	Single-turn high-resolution encoder
Feedback	Resolution	1024 Sin/Cos cycles/rev
Feedback	Protocol	Hiperface
Mechanical	Frame Size	100 mm
Mechanical	Magnet Stack	76.2 mm
Mechanical	Shaft	Keyed
Mechanical	Shaft Seal	No shaft seal
Mechanical	Brake	24 V DC
Mechanical	Connector	SpeedTEC DIN
Mechanical	Connector Style	Right-angle
Mechanical	Connector Rotation	180°
Mechanical	Mounting	IEC Metric
Mechanical	Mounting Hole Type	Type FF
Mechanical	Approx. Weight	5.3–6.5 kg
Motor	Rotor Inertia	0.00012 kg·m²
Environmental	Typical Operating Range	0–40°C
Duty	Typical Duty	S1

The main product dimensions and configuration are confirmed by the exact model information, while the torque, power, and inertia figures correspond to the B330P motor class.

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17. Five Related / Same-Series Models

The following models are closely related to the MPL-B330P-SJ74AA and are useful when comparing feedback, shaft, brake, and motor configuration options.

Model	Feedback	Shaft	Brake	Speed	Continuous Torque	Peak Torque	Output	Frame / Stack
MPL-B330P-SJ72AA	Single-turn high-resolution encoder	Keyed	No Brake	5000 RPM	4.18 Nm	11.1 Nm	1.8 kW	100 mm / 76.2 mm
MPL-B330P-RJ72AA	Resolver	Keyed	No Brake	5000 RPM	4.18 Nm	11.1 Nm	1.8 kW	100 mm / 76.2 mm
MPL-B330P-RJ74AA	Resolver	Keyed	24 V DC	5000 RPM	4.18 Nm	11.1 Nm	1.8 kW	100 mm / 76.2 mm
MPL-B330P-RK72AA	Resolver	Keyless	No Brake	5000 RPM	4.18 Nm	11.1 Nm	1.8 kW	100 mm / 76.2 mm
MPL-B330P-RK74AA	Resolver	Keyless	24 V DC	5000 RPM	4.18 Nm	11.1 Nm	1.8 kW	100 mm / 76.2 mm

These models belong to the same B330P performance class, with the main differences involving feedback technology, shaft configuration, and brake configuration.

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18. Five Representative Same-Brand Models

The following are representative models from the same brand and related MPL low-inertia servo motor family. They are useful for comparing different power and torque levels.

Model	Rated Speed	Continuous Torque	Peak Torque	Output	Rotor Inertia	Approx. Weight	Frame / Stack
MPL-B310P	5000 RPM	1.58 Nm	3.61 Nm	0.77 kW	0.000044 kg·m²	2.7 kg	Smaller frame class
MPL-B320P	5000 RPM	3.05 Nm	7.91 Nm	1.5 kW	0.000078 kg·m²	3.7 kg	Smaller frame class
MPL-B330P	5000 RPM	4.18 Nm	11.1 Nm	1.8 kW	0.00012 kg·m²	4.6 kg*	100 mm / 76.2 mm
MPL-B420P	5000 RPM	4.74 Nm	13.5 Nm	1.9 kW	0.00026 kg·m²	4.3 kg	100 mm class
MPL-B430P	5000 RPM	6.55 Nm	19.8 Nm	2.2 kW	0.00038 kg·m²	5.5 kg	Larger frame class

*The 4.6 kg figure represents the generic B330P family data. A complete SJ74AA configuration with encoder, brake, connector, and other hardware can have a higher actual weight.

These models should be regarded as representative same-brand choices rather than a ranking of popularity.

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19. B-Series Performance Comparison

Model	Speed	Continuous Torque	Peak Torque	Output	Rotor Inertia	Approx. Weight
MPL-B310P	5000 RPM	1.58 Nm	3.61 Nm	0.77 kW	0.000044 kg·m²	2.7 kg
MPL-B320P	5000 RPM	3.05 Nm	7.91 Nm	1.5 kW	0.000078 kg·m²	3.7 kg
MPL-B330P-SJ74AA	5000 RPM	4.18 Nm	11.1 Nm	1.8 kW	0.00012 kg·m²	Approx. 5.3–6.5 kg
MPL-B420P	5000 RPM	4.74 Nm	13.5 Nm	1.9 kW	0.00026 kg·m²	4.3 kg
MPL-B430P	5000 RPM	6.55 Nm	19.8 Nm	2.2 kW	0.00038 kg·m²	5.5 kg

The B330P occupies an intermediate position in this group, offering substantially more torque than the B310P and B320P while remaining below the larger B430P torque class.

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20. SJ74AA Compared With SJ72AA

The most direct comparison is between SJ74AA and SJ72AA.

Parameter	MPL-B330P-SJ74AA	MPL-B330P-SJ72AA
Feedback	Single-turn high-resolution encoder	Single-turn high-resolution encoder
Shaft	Keyed	Keyed
Speed	5000 RPM	5000 RPM
Continuous Torque	4.18 Nm	4.18 Nm
Peak Torque	11.1 Nm	11.1 Nm
Output	1.8 kW	1.8 kW
Frame	100 mm	100 mm
Stack	76.2 mm	76.2 mm
Brake	24 V DC	No Brake
Connector	Right-angle SpeedTEC DIN	Right-angle SpeedTEC DIN
Main Difference	Integrated holding brake	No integrated brake

The SJ74AA should therefore be selected when the machine requires the integrated 24 V DC holding brake, while the SJ72AA configuration is intended for applications where a motor-mounted brake is not required.

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21. SJ74AA Compared With RJ74AA

The RJ74AA configuration provides a useful comparison because it retains the keyed shaft and brake while changing the feedback technology.

Parameter	MPL-B330P-SJ74AA	MPL-B330P-RJ74AA
Feedback	Single-turn high-resolution encoder	Resolver
Shaft	Keyed	Keyed
Brake	24 V DC	24 V DC
Speed	5000 RPM	5000 RPM
Continuous Torque	4.18 Nm	4.18 Nm
Peak Torque	11.1 Nm	11.1 Nm
Output	1.8 kW	1.8 kW
Frame	100 mm	100 mm
Stack	76.2 mm	76.2 mm
Connector	Right-angle DIN	Right-angle DIN
Primary Difference	Encoder feedback	Resolver feedback

When replacing one configuration with another, the feedback interface must be checked carefully. A motor with the wrong feedback type may not be directly interchangeable even when the frame, shaft, brake, and torque ratings are similar.

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22. SJ74AA Compared With RK74AA

The RK74AA configuration retains the 24 V DC brake and resolver feedback but changes the shaft from keyed to keyless.

Parameter	MPL-B330P-SJ74AA	MPL-B330P-RK74AA
Feedback	Single-turn encoder	Resolver
Shaft	Keyed	Keyless
Brake	24 V DC	24 V DC
Speed	5000 RPM	5000 RPM
Continuous Torque	4.18 Nm	4.18 Nm
Peak Torque	11.1 Nm	11.1 Nm
Output	1.8 kW	1.8 kW
Frame	100 mm	100 mm
Stack	76.2 mm	76.2 mm
Connector	Right-angle DIN	Right-angle DIN

This comparison shows why the exact catalog number is important when selecting a replacement motor.

The basic motor class can be similar while the shaft and feedback configurations are substantially different.

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23. Typical Industries

Industry	Typical Application
Packaging	Feeding, indexing, cutting and sealing
Material Handling	Transfer and positioning
Machine Tools	Feed axes and indexing
Electronics	Assembly and positioning
Printing	Roller and registration control
Converting	Cutting and feeding
Automotive Production	Assembly and transfer
Metal Forming	Servo-controlled auxiliary motion
General Automation	High-speed positioning
Inspection Equipment	Rotary positioning
Automated Assembly	Indexing and transfer mechanisms

The MPL motor family is designed for demanding motion systems, with published application areas including packaging, converting, electronic assembly, automotive, metal forming, and material handling.

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24. Installation Considerations

The motor should be mounted on a rigid and accurately machined surface.

Correct shaft alignment is important because excessive angular or parallel misalignment can increase bearing loading and produce vibration.

The keyed shaft should be connected using a properly selected coupling or transmission component.

The coupling should be selected based on the motor speed, shaft diameter, torque, acceleration, radial load, axial load, and duty cycle.

The right-angle connector should have adequate clearance so that the cable is not forced against nearby mechanical structures.

The connector’s rotational capability can be used to select a more practical cable exit direction.

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25. Brake Installation Considerations

The integrated brake is intended for holding rather than serving as the primary dynamic braking method.

The brake supply should be designed according to the appropriate 24 V DC control architecture.

The machine control system should ensure that the brake is released and applied in the correct sequence relative to servo torque.

For vertical axes, the mechanical holding function should be evaluated carefully because a motor brake alone may not satisfy every machine safety requirement.

Where personnel safety is involved, a dedicated safety-rated holding and stopping architecture should be designed according to the machine’s applicable safety requirements.

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26. Maintenance Recommendations

Routine inspection can help maintain reliable operation.

Recommended inspection points include:

• Motor mounting bolts
• Shaft coupling
• Mechanical alignment
• Motor cable
• Encoder cable
• Connector condition
• Brake operation
• Motor temperature
• Bearing noise
• Mechanical vibration
• Load torque
• Servo drive diagnostic history

The brake should also be checked periodically if the motor is used in applications where frequent holding cycles occur.

Abnormal vibration should not automatically be attributed to the motor.

Possible causes include mechanical imbalance, coupling misalignment, excessive radial load, bearing wear, incorrect servo tuning, feedback problems, or excessive machine inertia.

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27. Troubleshooting Guide

Symptom	Possible Cause	Recommended Check
Motor does not rotate	Servo enable problem	Check drive status
Motor does not release from brake	24 V brake supply problem	Check brake voltage and wiring
Motor faults during acceleration	Excessive load	Check acceleration profile
Position error	Feedback problem	Check encoder circuit
Excessive vibration	Misalignment	Check coupling and mounting
Motor overheating	Excessive load or duty cycle	Check thermal conditions
Encoder fault	Cable or connector issue	Inspect feedback cable
Brake remains engaged	Brake control problem	Check brake command and supply
Poor positioning	Servo tuning issue	Check control parameters
Excessive noise	Bearing or mechanical issue	Inspect mechanical system
Unexpected servo trip	Drive protection	Check drive diagnostics

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28. Servo Drive Selection

The MPL-B330P-SJ74AA is intended to operate as part of a compatible servo motion-control system.

The drive must be selected based on more than nominal motor power.

The following parameters should be matched:

Drive Selection Factor	Requirement
Motor Voltage	460 V class
Motor Power	Approximately 1.8 kW
Continuous Torque	4.18 Nm
Peak Torque	11.1 Nm
Feedback	Single-turn high-resolution encoder
Feedback Protocol	Hiperface
Rated Speed	5000 RPM
Brake	24 V DC brake control
Mechanical Shaft	Keyed
Motor Inertia	0.00012 kg·m²
Load Inertia	Must be evaluated
Duty Cycle	Must satisfy thermal requirements

The published product information lists the MPL family for use with compatible servo drive systems, and the exact drive selection should be checked against the motor’s feedback and electrical configuration.

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29. Product Selection Checklist

Before selecting the MPL-B330P-SJ74AA, the following points should be verified.

Selection Item	Required Value / Consideration
Voltage	460 V class
Rated Speed	5000 RPM
Rated Power	Approximately 1.8 kW
Continuous Torque	4.18 Nm
Peak Torque	Approximately 11.1 Nm
Feedback	Single-turn high-resolution encoder
Shaft	Keyed
Brake	24 V DC
Frame	100 mm
Stack	76.2 mm
Rotor Inertia	0.00012 kg·m²
Weight	Approximately 5.3–6.5 kg
Mounting	IEC Metric
Connector	Right-angle SpeedTEC DIN
Connector Rotation	180°
Cable Routing	Adequate clearance required
Load Inertia	Must be calculated
Drive Compatibility	Must be confirmed
Brake Control	24 V DC control required

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30. Quick Reference Table

Parameter	Specification
Model	MPL-B330P-SJ74AA
Brand	Allen-Bradley
Series	MP-Series MPL
Product Type	Low-Inertia Brushless AC Servo Motor
Voltage	460 V AC
Rated Power	1.8 kW
Rated Speed	5000 RPM
Continuous Stall Torque	4.18 Nm
Peak Torque	11.1 Nm
Rotor Inertia	0.00012 kg·m²
Feedback	Single-turn high-resolution encoder
Feedback Resolution	1024 Sin/Cos
Feedback Protocol	Hiperface
Shaft	Keyed
Shaft Seal	No shaft seal
Brake	24 V DC Holding Brake
Connector	SpeedTEC DIN
Connector Style	Right-angle
Connector Rotation	180°
Frame Size	100 mm
Magnet Stack	76.2 mm
Frame Size, Imperial	3.94 in.
Stack Length, Imperial	3.0 in.
Mounting	IEC Metric
Mounting Holes	Type FF
Approx. Weight	5.3–6.5 kg
Typical Operating Temperature	0–40°C
Main Application	Industrial servo motion control

The exact model configuration and principal dimensions are identified in the product configuration data, while the B330P torque, output, speed, and inertia values are given in the motor selection data.

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31. Final Product Description

The MPL-B330P-SJ74AA is a 5000 RPM low-inertia brushless AC rotary servo motor designed for demanding industrial motion-control applications.

Its configuration combines a 460 V class motor, 100 mm frame, 76.2 mm magnet stack, 1.8 kW rated output, 4.18 Nm continuous stall torque, approximately 11.1 Nm peak torque, and approximately 0.00012 kg·m² rotor inertia.

The motor uses a single-turn high-resolution encoder, providing the feedback required for closed-loop servo control. The encoder configuration is identified as a 1024 Sin/Cos absolute single-turn encoder using Hiperface protocol.

The keyed shaft extension makes the motor suitable for conventional keyed couplings and mechanical transmission components.

The integrated 24 V DC holding brake is one of the most important characteristics of the SJ74AA configuration. It provides shaft-holding capability when the motor is not actively producing servo torque, making this version particularly suitable for applications where a motor-mounted holding brake is required.

The right-angle SpeedTEC DIN connector, with approximately 180° rotational flexibility, gives machine builders additional freedom when routing motor and feedback cables.

The motor’s low-inertia construction is well suited to machines that perform frequent acceleration, deceleration, indexing, and direction changes.

Typical applications include packaging machinery, material handling equipment, automated assembly systems, machine tools, electronic manufacturing equipment, printing and converting machinery, indexing tables, positioning equipment, and other industrial automation systems.

For replacement or new-machine selection, the most important parameters to verify are feedback type, shaft type, brake configuration, voltage class, continuous torque, peak torque, speed, load inertia, mounting dimensions, motor weight, connector configuration, cable requirements, and servo-drive compatibility.

The MPL-B330P-SJ74AA can therefore be described as a 100 mm-frame, 5000 RPM, 1.8 kW low-inertia servo motor with single-turn encoder feedback, keyed shaft, and integrated 24 V DC holding brake, intended for high-speed and dynamically responsive industrial motion applications.