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20G11BF765AN0NNNNN — Detailed Product Information, Technical Parameters, Applications and Related Models

The 20G11BF765AN0NNNNN is a high-power air-cooled AC drive belonging to the PowerFlex 755 family. It is designed for large three-phase motor applications where high current capacity, variable-speed operation, controlled acceleration and reliable industrial motor control are required.

This model is a 690 VAC, 765 A, Frame 9 packaged drive. It is intended for large industrial machinery rather than small or medium-sized motor applications.

The model is also an older/discontinued catalog configuration, so it is particularly relevant for existing installations, maintenance, replacement projects and equipment refurbishment.

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1. Basic Product Identification

*Dimensions and weight should be treated as engineering reference values for the large Frame 9 packaged configuration. The actual installed dimensions and shipping weight can vary according to the complete cabinet arrangement, accessories and factory configuration. For replacement or installation work, the equipment drawing and nameplate should take priority.

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2. Product Introduction

The 20G11BF765AN0NNNNN is a large-capacity variable-frequency AC drive intended to control high-power three-phase motors.

With a rated current of 765 A and a voltage class of 690 VAC, it belongs to the high-power end of industrial variable-speed motor control.

The drive converts incoming fixed-frequency AC power into a controlled electrical output suitable for the connected motor. By controlling output frequency and voltage, it allows the motor to operate at different speeds and provides controlled starting and stopping.

This is particularly useful for machines with large inertia, high starting loads or processes that need variable production rates.

The PowerFlex 755 architecture is designed for industrial applications where motor control is integrated into a larger automation system.

The drive can therefore be used not only as a standalone motor controller, but also as part of a plant-wide automation and process-control system.

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3. Brand and Product Series

The PowerFlex 755 series is intended for demanding industrial applications where precise motor control, flexible configuration and integration with automation systems are important.

The 20G11BF765AN0NNNNN represents a particularly high-current configuration within this product family.

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4. Main Electrical Parameters

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5. Power Rating

The 765 A current rating gives this drive substantial motor-control capacity.

For the commonly referenced rating configuration, the approximate power ratings are:

The distinction between normal-duty and heavy-duty operation is important.

A motor application should not be selected simply by comparing the motor’s nameplate kW with the drive’s largest published power value.

The actual motor full-load current, overload requirements, starting torque, acceleration requirements and operating profile should also be considered.

For a machine with demanding acceleration or high torque, the heavy-duty rating can be more relevant than the normal-duty rating.

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6. Voltage Class

The drive operates in the 690 VAC class.

This voltage level is particularly suitable for large industrial motors.

At high motor power levels, higher motor voltage can help keep the required operating current within a practical range.

This makes 690 VAC systems common in large industrial equipment such as:

• Mining conveyors.
• Large pumps.
• Industrial fans.
• Large compressors.
• Cement machinery.
• Bulk-material handling equipment.
• Process equipment.
• Large ventilation systems.

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7. 765 A Current Rating

The 765 A rating is one of the most important specifications of this model.

A current rating at this level indicates that the drive is designed for large industrial motors.

Compared with lower-current versions such as 590 A, 650 A or 710 A configurations, the 765 A version provides greater output-current capability.

This makes it appropriate where the connected motor has a higher full-load current or where additional drive capacity is needed.

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8. Frame 9 Construction

The drive uses Frame 9 construction.

Frame size is important because it determines much more than the electrical rating.

It also affects:

• Cabinet dimensions.
• Cooling requirements.
• Internal power components.
• Installation arrangement.
• Cable routing.
• Maintenance access.
• Lifting requirements.
• Overall equipment weight.

A Frame 9 high-power drive is therefore normally installed in a dedicated industrial electrical area or MCC-style installation.

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9. Mechanical Dimensions

For planning purposes, the large Frame 9 packaged configuration can be treated as approximately:

Height: 2453 mm

Width: 1200 mm

Depth: 800 mm

These dimensions should not be used as a substitute for the actual mechanical drawing when preparing a foundation, cabinet opening or transportation route.

Large packaged drives can have different overall dimensions depending on the selected factory configuration and associated equipment.

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10. Weight

The approximate equipment weight for this large Frame 9 configuration is:

Approximately 1270 kg.

A weight of approximately 1.27 tonnes has implications for transportation, unloading and final positioning.

Before installation, the following should be checked:

• Floor loading.
• Lifting points.
• Forklift/crane capacity.
• Transportation route.
• Door dimensions.
• Cabinet clearance.
• Maintenance access.
• Final installation position.

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11. Cooling System

The 20G11BF765AN0NNNNN uses an air-cooled architecture.

Air cooling is practical for large industrial drives when the electrical room or equipment enclosure can provide sufficient ventilation and heat removal.

Because the drive handles a very high current, cooling is an important part of the installation.

The cooling system should be kept clean and unobstructed.

Particular attention should be paid to:

• Cooling fans.
• Air intake.
• Air exhaust.
• Cabinet ventilation.
• Ambient temperature.
• Dust accumulation.
• Airflow restrictions.

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12. Enclosure and Protection

The model is associated with a NEMA Type 1 / IP20 enclosure arrangement.

The enclosure rating should be considered when planning the installation environment.

If the equipment is installed in a dusty, wet or corrosive environment, additional environmental protection may be necessary.

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13. EMC Filtering

The model includes an EMC-filtered configuration.

Electromagnetic compatibility is particularly important in large industrial installations because high-power switching devices can coexist with:

• PLC systems.
• Communication equipment.
• Sensors.
• Instrumentation.
• Control systems.
• Other variable-frequency drives.

Correct grounding, bonding, cable routing and shielding remain important even when filtering is provided.

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14. Dynamic Braking

The specified model configuration has:

Dynamic Braking: None.

This is an important consideration when evaluating the drive for machines requiring rapid stopping.

Applications with high rotational inertia may produce regenerative energy during deceleration.

Examples include:

• Large conveyors.
• Large fans.
• Large rotating machinery.
• Certain material-handling systems.
• High-inertia process equipment.

If the application requires very rapid deceleration, the braking strategy should be evaluated separately.

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15. Product Operating Principle

The basic operating sequence can be described as:

690 VAC Three-Phase Input

↓

Input / Precharge Section

↓

DC Bus

↓

Power Conversion Section

↓

Variable-Frequency AC Output

↓

Three-Phase Motor

↓

Mechanical Load

The drive controls the electrical output supplied to the motor.

By changing the output frequency and voltage, motor speed can be adjusted according to the process requirement.

This makes the system much more flexible than a conventional fixed-speed motor starter.

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16. Product Applications

The 20G11BF765AN0NNNNN is intended for large industrial motor applications.

Typical application areas include:

Mining

Large mining equipment often requires motors with high current capacity.

Potential applications include:

• Long conveyors.
• Ore conveyors.
• Transfer conveyors.
• Ventilation fans.
• Large pumps.
• Material-processing equipment.

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Cement

Large cement facilities use high-power motors throughout the production process.

Potential applications include:

• Process fans.
• Large conveyors.
• Blowers.
• Pumps.
• Material-handling systems.
• Cooling equipment.

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Aggregate Processing

Aggregate equipment can require large motors for moving and processing bulk material.

The drive can be considered for:

• Feed conveyors.
• Transfer conveyors.
• Large fans.
• Pumps.
• Material-processing machinery.

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Water Treatment

Large pumps and blowers are common in water and wastewater facilities.

Possible applications include:

• Raw-water pumps.
• Transfer pumps.
• Wastewater pumps.
• Aeration blowers.
• Cooling-water systems.
• Process pumps.

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Industrial Fans

Large industrial fans can consume considerable electrical power.

Applications may include:

• Furnace fans.
• Exhaust fans.
• Process ventilation.
• Dust collection.
• Combustion-air systems.
• Cooling systems.

Variable-speed operation can allow airflow to be adjusted to the actual process requirement.

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Large Pumps

The drive can be used for suitable high-power pump applications.

Possible applications include:

• Water circulation.
• Industrial cooling.
• Process-water systems.
• Water transfer.
• Large pumping stations.

For variable-torque applications, adjusting pump speed can provide substantial operational flexibility.

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Compressors

Large compressors may require high-power motors and controlled acceleration.

The drive can be evaluated for suitable variable-speed compressor systems where the compressor and motor are designed for variable-frequency operation.

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Material Handling

The drive is also suitable for large material-handling machinery.

Examples include:

• Bulk conveyors.
• Transfer systems.
• Processing lines.
• Industrial handling systems.
• Large production machinery.

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17. Conveyor Application Advantages

Large conveyors often have considerable inertia.

Directly starting a large motor can result in high mechanical stress.

A variable-speed drive can provide a controlled acceleration profile.

This can help reduce sudden stress on:

• Conveyor belts.
• Gearboxes.
• Couplings.
• Shafts.
• Bearings.
• Mechanical structures.

The drive can also allow conveyor speed to be adjusted according to material flow.

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18. Pump Application Advantages

In pump applications, the ability to adjust motor speed can help match pump output to process demand.

For example:

This provides greater process flexibility than simply operating a motor at one fixed speed.

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19. Fan Application Advantages

Fans and blowers are often operated at different output levels depending on process requirements.

Variable-speed control can allow the fan to run at the required speed rather than continuously operating at maximum speed.

This can provide:

• Better airflow control.
• Reduced mechanical stress.
• Better process regulation.
• Potential energy savings.
• Improved system flexibility.

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20. Main Product Advantages

High Current Capacity

The 765 A rating gives the drive substantial capacity for large motors.

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690 VAC Compatibility

The 690 VAC voltage class is well suited to high-power industrial motor systems.

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High Power Capability

The approximately 750 kW normal-duty rating makes the drive appropriate for very large industrial machines.

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Heavy-Duty Capability

The approximately 630 kW heavy-duty rating provides considerable capacity for more demanding load profiles.

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Air-Cooled Construction

Air cooling can provide a practical solution for high-power industrial equipment when sufficient ventilation is available.

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Industrial Enclosure

The NEMA Type 1 / IP20 arrangement is intended for appropriate industrial electrical environments.

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Variable-Speed Control

The drive can control motor speed according to production requirements.

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Controlled Acceleration

Large motors can be accelerated progressively instead of being started abruptly.

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Improved Process Flexibility

Motor speed can be adjusted according to:

• Flow.
• Pressure.
• Material quantity.
• Production speed.
• Process requirements.

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Automation Integration

The drive can operate as part of a larger industrial automation system.

This makes it suitable for centralized control architectures.

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21. Five Recommended Models from the Same Series or Closely Related Models

The following models are useful comparison choices within the high-power PowerFlex 755 range.

The 590 A, 650 A and 710 A models are useful where the motor current requirement is lower.

The 795 A model provides additional current capacity and can be considered when the motor operating current approaches the upper range of the 765 A configuration.

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22. Comparison of 590 A, 650 A, 710 A and 765 A Models

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23. Five Same-Brand Popular / Commonly Used Models

The following are useful models to consider when comparing high-power and general-purpose products from the same brand family.

These models are useful primarily as comparison points because their current capacity is close to or above the 765 A level.

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24. Application Comparison

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25. Motor Selection Considerations

The drive should be selected according to the motor’s actual electrical requirements.

Important motor information includes:

A motor rated close to 750 kW should not automatically be paired with this drive simply because the numbers appear similar.

The motor nameplate current and required duty should be checked first.

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26. Installation Requirements

A drive of this size requires more installation planning than a small variable-frequency drive.

Important considerations include:

Electrical Room

The electrical room should have sufficient space for:

• Drive cabinet.
• Cable routing.
• Maintenance access.
• Airflow.
• Adjacent equipment.

Floor

The floor should be capable of supporting approximately 1270 kg of equipment weight, with suitable safety margin.

Ventilation

The room must be able to remove the heat generated by the drive.

Cable Routing

High-power input and motor cables should be properly sized and routed.

Grounding

Grounding and bonding should be designed correctly.

Maintenance Clearance

Adequate space should be provided around the cabinet for inspection and service.

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27. Cooling and Ventilation

Because the product is air cooled, ventilation is particularly important.

The installation should avoid:

• Blocked air intakes.
• Restricted exhaust.
• Excessive dust.
• Excessive ambient temperature.
• Recirculation of hot air.

Regular inspection of the cooling system can help prevent thermal problems.

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28. Maintenance Recommendations

Large drives should receive preventive maintenance because an unexpected failure can interrupt a significant portion of plant production.

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29. Advantages for Heavy Industrial Equipment

The 20G11BF765AN0NNNNN is especially attractive when the equipment has:

• High motor power.
• High starting torque.
• Large mechanical inertia.
• Long operating hours.
• Variable production requirements.
• Frequent process changes.
• Centralized automation requirements.

The 765 A current rating gives the model considerable capacity for large motors.

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30. Advantages for Mining and Bulk Material Handling

Mining and bulk-material equipment can place severe demands on motors and mechanical systems.

The drive can provide:

• Controlled motor acceleration.
• Adjustable operating speed.
• Controlled motor operation.
• Integration with process control.
• Improved handling of changing production rates.

For a large conveyor, for example, the motor can accelerate progressively instead of applying full mechanical torque immediately.

This can be helpful for reducing mechanical shock.

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31. Advantages for Pump and Fan Systems

For pump and fan applications, the major advantage is adjustable speed.

Instead of using a fixed-speed motor and controlling process output entirely through mechanical restrictions, the drive can adjust motor speed itself.

This can provide:

• Better flow control.
• Better pressure control.
• Better airflow control.
• Reduced unnecessary operation.
• Improved process response.
• Potential energy savings.

The actual energy savings depend on the complete mechanical system and operating conditions.

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32. Advantages for Large Process Machinery

In a large manufacturing process, different machines may need to operate at coordinated speeds.

A variable-frequency drive can be integrated into the automation system so that motor speed becomes one of the controllable process variables.

For example:

Production Rate Increase

→ Conveyor Speed Increase

→ Motor Speed Increase

→ Material Flow Increase

Likewise:

Production Rate Reduction

→ Conveyor Speed Reduction

→ Motor Speed Reduction

→ Material Flow Reduction

This type of control can provide greater flexibility than fixed-speed motor operation.

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33. Model Number Interpretation

The complete catalog number is:

20G11BF765AN0NNNNN

The model number identifies a specific factory configuration rather than simply identifying a generic PowerFlex drive.

The important practical elements include the:

• 20G family designation.
• PowerFlex 755 architecture.
• 690 VAC class.
• 765 A current rating.
• Frame 9 configuration.
• Air-cooled packaged construction.
• Filtering configuration.
• Dynamic-braking arrangement.
• Enclosure arrangement.
• Factory option configuration.

For this reason, replacing the unit with another 765 A model should not be done solely by matching voltage and current.

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34. Important Replacement Consideration

The exact model number should be checked when replacing an existing unit.

A replacement drive with:

690 VAC + 765 A

may appear electrically similar.

However, differences can exist in:

• Filtering.
• Braking.
• Operator interface.
• Common-mode configuration.
• Enclosure.
• Cabinet construction.
• Control options.
• Communication options.
• Factory-installed accessories.

Therefore, the complete catalog number should be compared before treating another model as a direct replacement.

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35. Summary Technical Table

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36. Final Product Evaluation

The 20G11BF765AN0NNNNN is a high-capacity industrial variable-frequency drive intended for large motor systems.

Its key specifications are:

690 VAC

765 A

Frame 9

Air Cooled

Approximately 750 kW Normal Duty

Approximately 630 kW Heavy Duty

NEMA Type 1

IP20

600 mm Deep MCC Style

Approximately 2453 × 1200 × 800 mm

Approximately 1270 kg

The product is particularly suitable for applications where a large AC motor needs controlled speed rather than simple fixed-speed operation.

Its strongest application areas include large conveyors, mining machinery, pumps, fans, blowers, compressors, cement equipment, aggregate processing equipment, water-treatment machinery and other large process machines.

For a large conveyor, the drive can provide controlled acceleration and adjustable running speed.

For a large pump or fan, it can provide variable-speed process control and potentially improve energy performance.

For large process machinery, it can become part of an automated control system and allow the motor speed to respond to changing production conditions.

The main selection advantage of the 20G11BF765AN0NNNNN compared with lower-current models is its 765 A output capacity, combined with the high-power capability of the 690 VAC PowerFlex 755 platform.

For replacement or refurbishment projects, however, the complete catalog number should always be matched against the existing electrical, mechanical and control configuration rather than selecting a replacement solely by comparing kW or amperage.