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Allen-Bradley MPL-B680D-M-X235 Servo Motor – Detailed Specifications, Product Introduction, Applications, Advantages, and Related Models

1. Product Overview

The Allen-Bradley MPL-B680D-M-X235 is a large-frame MP-Series MPL low-inertia brushless AC servo motor designed for demanding industrial motion-control applications.

It belongs to the larger end of the MPL motor family and is intended for machines that require substantial torque, accurate position feedback, controlled acceleration and deceleration, and dependable operation under repeated servo duty.

The motor uses a 215 mm class frame with an approximately 203.2 mm motor stack, giving it a relatively large electromagnetic package. Its nominal performance is in the region of 62.8 N·m continuous stall torque, 154.2 N·m peak stall torque, and approximately 9.3 kW rated output, with a 2000 rpm speed class.

The MPL-B680D-M-X235 is particularly interesting because it combines the B680D mechanical and performance class with a multi-turn absolute feedback configuration and special X235 configuration. Unlike a brake-equipped B680D model, this configuration should be treated as a no-integral-brake motor.

Because X235 is a special configuration designation, the exact electrical and mechanical characteristics should always be matched to the motor nameplate when replacing an existing unit. The values below are therefore presented as practical engineering specifications, with approximate values identified where appropriate.

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2. Brand and Product Series

The MPL family is designed around brushless permanent-magnet servo technology. Unlike a conventional fixed-speed industrial motor, the servo motor is intended to operate as part of a complete motion-control system.

The motor, feedback device, servo drive, motion controller, cables, and mechanical transmission work together to control position, speed, acceleration, deceleration, and torque.

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3. Detailed Product Parameters

The torque, speed, power, inertia, and frame figures above should be treated as the typical B680D-class characteristics applicable to this configuration. The X235 suffix represents a special configuration, so exact electrical values should be confirmed against the specific motor nameplate for final engineering work.

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4. Physical Dimensions

The MPL-B680D-M-X235 is a large-frame servo motor.

Its principal physical dimensions are associated with a 215 mm frame and approximately 203.2 mm motor stack.

The 215 mm × 203.2 mm figures should be regarded as the main frame and stack dimensions rather than the complete installed envelope.

When designing the machine, additional room must be provided for the shaft, coupling, connector, feedback cable, power cable, cable bend radius, mounting hardware, and maintenance access.

This is particularly important with the right-angle connector arrangement because the connector and cable routing can extend beyond the nominal motor body.

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5. Weight

The MPL-B680D-M-X235 is a relatively heavy servo motor.

A practical preliminary engineering value is approximately 40 kg, with the B680D motor class commonly falling around the 40.4 kg range depending on configuration.

The weight is significant enough that machine builders should consider how the motor will be lifted and supported during installation.

For a vertical machine structure, the mounting plate and flange should also be checked for rigidity and long-term mechanical loading.

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6. Model Number Explanation

The model number is:

MPL-B680D-M-X235

A practical interpretation is shown below.

The first part of the model number identifies the general motor family and physical/performance class.

The X235 portion is particularly important because it indicates a special configuration rather than a simple standard suffix.

For replacement purposes, it is therefore preferable to match the complete model number rather than selecting a visually similar B680D motor solely because the frame size and torque ratings appear similar.

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7. Motor Construction

The MPL-B680D-M-X235 uses a brushless permanent-magnet motor construction.

Permanent magnets are incorporated into the rotor, while the stator winding produces the rotating magnetic field required to generate torque.

The brushless design eliminates conventional motor brushes and commutators.

This is advantageous for industrial servo applications because there are no conventional brush components that need periodic replacement as part of normal operation.

The servo drive controls the electrical current supplied to the motor windings and uses the feedback device to regulate the motor’s actual position and speed.

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8. Torque Performance

Torque is one of the main reasons to select the B680D motor class.

The MPL-B680D-M-X235 has approximately:

• 62.8 N·m continuous stall torque
• 154.2 N·m peak stall torque

The continuous torque figure is more important when the motor must carry a substantial load for an extended period.

Peak torque is more relevant during acceleration, deceleration, indexing, rapid direction changes, and short-duration load disturbances.

A machine should not be designed around the assumption that the motor can operate indefinitely at peak torque.

The actual allowable peak duration depends on the complete motor, drive, thermal conditions, duty cycle, and application profile.

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9. 2000 rpm Speed Class

The D configuration corresponds to a 2000 rpm class within the MPL family.

This makes the motor particularly attractive for applications where high torque is more important than extremely high rotational speed.

Compared with a 3000 rpm B680F configuration, the B680D is more torque-oriented.

This can be useful for large mechanical loads, heavy rollers, large rotary mechanisms, high-load positioning axes, and other applications where the motor must produce substantial torque without requiring very high shaft speed.

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10. Rated Output

The motor’s continuous output is approximately 9.3 kW.

This puts the MPL-B680D-M-X235 into a relatively high-power servo category.

The 9.3 kW output is appropriate for large automation equipment rather than small positioning mechanisms.

The actual mechanical power delivered to the machine will also depend on the transmission system, gearbox efficiency, coupling efficiency, and operating point.

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11. Low-Inertia Rotor

Although the MPL-B680D-M-X235 is a large motor, it uses a low-inertia servo design.

The approximate rotor inertia is:

0.00775 kg·m²

Low rotor inertia can help the servo system react quickly when the commanded speed changes.

This is useful for machines that repeatedly accelerate, decelerate, stop, reverse, or perform indexing movements.

However, the motor’s own rotor inertia is only part of the total system inertia.

A large roller or rotary table can have much greater inertia than the motor rotor itself.

The reflected load inertia must therefore be considered when selecting the motor and tuning the servo system.

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12. Multi-Turn Absolute Feedback

The M portion of the model represents a multi-turn absolute feedback configuration.

This is one of the major features of the MPL-B680D-M-X235.

A multi-turn encoder provides position information across multiple shaft revolutions.

This can be particularly useful for linear axes driven by ball screws, belts, racks, pinions, or gear systems where the motor must rotate many times to complete the machine’s mechanical travel.

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13. Advantages of Absolute Feedback

The absolute feedback configuration can be advantageous in applications where position information is important immediately after system startup.

Typical applications include:

• Long-travel linear axes.
• Machine-tool positioning.
• Rotary indexing.
• Large positioning tables.
• Material-handling equipment.
• Vertical positioning systems.
• Automated storage equipment.
• High-precision assembly machines.
• Large servo-driven conveyors.

The exact startup and homing behavior depends on the complete control system and application architecture, but absolute feedback can reduce the need for certain external position-reference arrangements.

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14. Keyed Shaft

The MPL-B680D-M-X235 uses a keyed shaft configuration.

A keyed shaft is a familiar industrial mechanical interface.

It is useful where the motor must transmit substantial torque to a mechanical coupling or driven component.

The coupling should be correctly selected for the motor torque and speed.

Shaft alignment should also be checked carefully because misalignment can increase bearing loads and vibration.

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15. Brake Configuration

The MPL-B680D-M-X235 does not include an integral motor brake.

This is an important distinction when comparing it with the MPL-B680D-MJ74AA.

The no-brake configuration is not necessarily a disadvantage.

For a horizontal axis where gravity does not cause the load to move when servo torque is removed, an integral brake may not be necessary.

On the other hand, a vertical axis with a heavy load may require a dedicated holding mechanism.

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16. Right-Angle Connector

The motor uses a right-angle DIN-type connector configuration with orientation flexibility.

The connector arrangement is particularly useful when the motor is installed inside a compact machine.

The connector should have sufficient clearance to allow installation, removal, cable routing, and maintenance.

The cable bend radius should also be considered when determining the final motor position.

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17. Mounting Configuration

The MPL-B680D-M-X235 uses a large metric flange mounting arrangement.

A large servo motor should be mounted to a sufficiently rigid structure.

A flexible mounting plate can cause unwanted vibration and mechanical resonance.

In high-precision servo applications, the mechanical structure is just as important as the motor’s encoder resolution.

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18. Main Product Advantages

18.1 High Continuous Torque

The approximately 62.8 N·m continuous torque provides substantial load-handling capability.

This makes the motor suitable for large mechanical axes that require significant torque throughout their operating cycle.

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18.2 High Peak Torque

The approximately 154.2 N·m peak torque provides a large dynamic torque reserve.

This is useful during acceleration, deceleration, indexing, and temporary overload conditions.

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18.3 Multi-Turn Absolute Feedback

The multi-turn feedback arrangement is particularly useful for long-travel and multi-revolution positioning systems.

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18.4 High-Resolution Feedback

The approximately 1024 Sin/Cos cycles-per-revolution class feedback provides detailed position information for servo regulation.

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18.5 Low-Inertia Design

The low-inertia rotor supports responsive dynamic behavior.

This is particularly valuable in applications involving repeated acceleration and deceleration.

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18.6 Large Frame and Long Stack

The 215 mm frame and approximately 203.2 mm stack provide the electromagnetic size necessary for high torque.

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18.7 Keyed Shaft

The keyed shaft provides a conventional industrial mechanical interface for couplings and torque-transmission components.

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18.8 No Integral Brake

For applications that do not require a motor-mounted holding brake, the no-brake configuration can simplify the motor arrangement.

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18.9 Flexible Connector

The right-angle connector arrangement provides greater flexibility when routing motor cables inside the machine.

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19. Typical Applications

Heavy Material Handling

The motor can be considered for heavy material-handling machinery where substantial torque is needed to move or position a load.

Typical examples include:

• Heavy conveyors.
• Transfer units.
• Roller systems.
• Positioning platforms.
• Large material-handling axes.
• Automated storage machinery.

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Packaging Machinery

Large packaging machines can require high-torque servo axes for indexing, product positioning, cutting, forming, or synchronized movement.

The B680D motor class is more appropriate for the heavier axes rather than small auxiliary mechanisms.

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Machine Tools

Potential applications include:

• Large positioning axes.
• Rotary mechanisms.
• Heavy auxiliary axes.
• High-load machine-tool mechanisms.
• Large mechanical positioning systems.

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Printing and Converting Equipment

Printing and converting equipment often requires coordinated movement between multiple axes.

The high-resolution feedback and servo control capability can be useful for maintaining synchronization and accurate positioning.

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Rotary Tables

A large rotary table may require significant torque to accelerate and decelerate.

The B680D motor’s peak torque capability can be useful in such applications.

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Linear Positioning Systems

When connected through a suitable ball screw, belt, rack-and-pinion mechanism, or gearbox, the motor can drive a large linear axis.

The multi-turn encoder is particularly useful for mechanisms where the motor must rotate through many revolutions.

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Heavy Horizontal Axes

The no-brake configuration makes the motor particularly suitable for heavy horizontal axes where an integrated holding brake is not required.

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20. Applications Where the No-Brake Configuration Is Useful

The lack of an integral brake should be considered during the initial motor-selection stage rather than after the mechanical design has already been completed.

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21. Five Closely Related Models

The following five MPL models are useful alternatives or comparison models for the MPL-B680D-M-X235.

These models are useful because they allow the main selection variables to be compared directly: speed, feedback, brake, torque, and physical size.

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22. MPL-B680D-M-X235 Compared With MPL-B680D-MJ72AA

The MPL-B680D-MJ72AA is probably the closest standard comparison when the application does not require a brake.

The main difference is the special configuration associated with X235.

For replacement work, the complete model number should be matched rather than assuming the standard MJ72AA is automatically interchangeable.

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23. MPL-B680D-M-X235 Compared With MPL-B680D-MJ74AA

If the application requires a holding brake, the MJ74AA configuration is the more appropriate direction.

If the application does not require a motor-mounted brake, the X235 configuration may be preferable depending on the machine’s electrical requirements.

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24. MPL-B680D-M-X235 Compared With MPL-B680D-SJ72AA

The primary selection factor here is the feedback architecture.

Where the application requires multi-turn position information, the M configuration is the more suitable direction.

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25. Five Same-Brand Commonly Compared Models

The following models are useful same-brand comparison choices when evaluating larger servo motor applications.

These models represent useful steps through the larger MPL motor range.

The B640F is the shorter-stack option, the B660F provides an intermediate stack length, and the B680D provides the largest stack and highest torque among these comparison examples.

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26. Frame and Stack Comparison

This comparison illustrates why the B680D is a high-torque configuration.

The frame remains approximately 215 mm, but the motor uses the longest stack in this group.

The additional active motor length contributes to its higher torque capability.

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27. Selection Based on Application

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28. Mechanical Design Considerations

The MPL-B680D-M-X235 is not a small motor.

Its approximately 40 kg weight and 215 mm frame mean that the mechanical design must provide adequate support.

Important considerations include:

• Mounting plate rigidity.
• Flange strength.
• Bolt selection.
• Shaft alignment.
• Coupling alignment.
• Radial shaft load.
• Axial shaft load.
• Cable clearance.
• Connector accessibility.
• Vibration.
• Thermal dissipation.
• Maintenance access.

A rigid mechanical structure is especially important for a precision servo axis.

Even an excellent encoder cannot compensate for excessive mechanical flexibility or backlash.

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29. Inertia Matching

The approximately 0.00775 kg·m² rotor inertia is relatively low for a motor of this physical size.

However, the machine load may be much larger.

For example, a large rotary table can have significant inertia, while a long roller or flywheel can have even more.

When a gearbox is installed between the motor and load, the load inertia is reflected through the transmission ratio.

This means that the motor should be selected using the reflected load inertia, not simply the motor’s rotor inertia.

A correct inertia calculation can improve:

• Acceleration performance.
• Settling time.
• Servo stability.
• Positioning accuracy.
• Mechanical life.
• Motor thermal performance.

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30. Thermal Considerations

High torque means high thermal demand.

The continuous torque rating should therefore be evaluated together with the actual operating cycle.

Important factors include:

• Ambient temperature.
• Motor mounting.
• Enclosure size.
• Cooling conditions.
• Duty cycle.
• Acceleration frequency.
• Deceleration frequency.
• Continuous load.
• Peak-load duration.
• Surrounding heat sources.

A motor that operates close to its continuous torque limit for long periods should be evaluated carefully.

Likewise, repeated high-current acceleration cycles can create more thermal stress than a simple steady-speed application.

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31. Installation Considerations

Because the motor is approximately 40 kg class, proper handling is recommended during installation.

The motor should be supported securely during mounting.

The flange should be aligned with the driven machine.

The shaft coupling should be installed without forcing the shaft into an incorrect position.

Cable routing should provide adequate bend radius and avoid excessive mechanical stress.

The connector should remain accessible enough for service and inspection.

The machine should also allow enough room to remove the motor if maintenance or replacement becomes necessary.

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32. Maintenance

The MPL-B680D-M-X235 does not use conventional motor brushes, so there is no routine brush replacement requirement.

Nevertheless, the complete servo system should be inspected periodically.

Recommended inspection areas include:

• Mounting bolts.
• Coupling condition.
• Shaft alignment.
• Bearing noise.
• Motor vibration.
• Motor temperature.
• Encoder feedback.
• Power cables.
• Feedback cables.
• Connector condition.
• Servo following error.
• Mechanical backlash.
• Abnormal machine noise.

Changes in motor temperature, vibration, positioning accuracy, or following error can indicate problems in the motor, drive, coupling, bearings, or machine mechanics.

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33. Servo Drive and System Compatibility

The MPL-B680D-M-X235 should be used with a servo drive that is electrically and feedback-compatible with the motor configuration.

The X235 designation makes this especially important.

Before selecting a replacement or drive, the following should be checked:

A mechanically similar motor is not necessarily an electrically interchangeable motor.

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34. Why Choose the MPL-B680D-M-X235?

The motor is particularly attractive when the machine requires the following combination:

High torque + 2000 rpm class + multi-turn absolute feedback + low inertia + keyed shaft + no integral brake.

This combination is useful for heavy horizontal servo axes where a motor-mounted brake is unnecessary.

It can also be useful when a special electrical configuration is required by an existing machine design.

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35. Advantages Compared With Smaller MPL Motors

Compared with shorter-stack MPL motors such as the B640F and B660F families, the B680D provides substantially more torque.

The B680D is therefore not necessarily the best choice for every machine.

If the machine only needs 30–40 N·m of continuous torque, a smaller motor may provide a more compact and economical solution.

The B680D becomes more attractive as the required continuous and peak torque increase.

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36. Overall Product Evaluation

The Allen-Bradley MPL-B680D-M-X235 is a high-capacity industrial servo motor aimed at applications where a conventional small servo motor would not provide sufficient torque.

Its approximately 215 mm frame, 203.2 mm stack, 62.8 N·m continuous torque, 154.2 N·m peak torque, and 9.3 kW output give it the capacity required for many heavy-duty motion applications.

The multi-turn absolute feedback is another major strength.

It allows the motor to provide detailed shaft-position information across multiple revolutions, which is particularly useful in long-travel linear axes and large positioning mechanisms.

The no-brake configuration makes it especially suitable for horizontal applications where an integral holding brake is not required.

For vertical applications, the lack of an integral brake must be addressed separately through the machine’s mechanical and safety design.

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37. Final Technical Summary

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38. Conclusion

The Allen-Bradley MPL-B680D-M-X235 is a large-frame, high-torque servo motor from the MP-Series MPL Low-Inertia Brushless Servo Motor family.

Its approximately 62.8 N·m continuous torque, 154.2 N·m peak torque, 9.3 kW rated output, and 2000 rpm speed class make it particularly suitable for demanding industrial motion applications.

The multi-turn absolute feedback, keyed shaft, low-inertia rotor, and flexible right-angle connector arrangement add practical value when integrating the motor into a large automation system.

One of the most important characteristics of this particular model is its no-integral-brake configuration. This makes it a strong candidate for heavy horizontal servo axes, rotary mechanisms, conveyors, positioning systems, and other applications where a motor-mounted holding brake is not required.

If an integral brake is needed, the MPL-B680D-MJ74AA is a useful comparison.

If a standard no-brake multi-turn configuration is preferred, the MPL-B680D-MJ72AA is another close comparison.

If single-turn feedback is sufficient, the MPL-B680D-SJ72AA and MPL-B680D-SJ74AA provide alternative configurations.

For higher-speed applications, the MPL-B680F family provides a useful direction, while the MPL-B660F and MPL-B640F families are worth considering when the machine requires less torque or a shorter motor body.

Overall, the MPL-B680D-M-X235 is best suited to applications that need high torque, high-power servo performance, multi-turn absolute position feedback, responsive low-inertia motion, and a large mechanical package without an integral motor brake.