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20G11BF765JN4NNNNN — Detailed Product Description, Technical Parameters, Applications, Advantages and Related Models

The 20G11BF765JN4NNNNN is a high-power PowerFlex 755 AC drive designed for large three-phase industrial motors.

It is a 690 VAC, 765 A, Frame 9, air-cooled packaged drive intended for demanding variable-speed applications. The configuration includes an AC input with precharge, filtered construction, a common-mode jumper, no dynamic braking, and a door-mounted operator interface arrangement.

The model is particularly suitable for large conveyors, pumps, fans, blowers, compressors, mining equipment, cement machinery, material-handling systems and other high-power process equipment.

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1. Product Identification

*The dimensions and weight are engineering-reference values for the large Frame 9 packaged configuration. The exact shipping and installation dimensions can vary with the final factory configuration. For an actual replacement, lifting plan or cabinet installation, the nameplate and mechanical drawing for the specific unit should take priority.

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2. Product Series

The 20G11BF765JN4NNNNN belongs to the PowerFlex 755 series.

The PowerFlex 755 family is intended for large industrial variable-frequency motor applications where a simple fixed-speed starter is not sufficient.

The drive is designed to provide controlled motor operation and can be incorporated into a larger automation system.

The 765 A configuration is a high-capacity version of the series and is intended for motors requiring substantial current.

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3. Product Introduction

The basic function of the 20G11BF765JN4NNNNN is to convert incoming three-phase AC power into a controlled variable-frequency output for a large AC motor.

A simplified power flow is:

690 VAC Three-Phase Input

↓

Input and Precharge Section

↓

DC Bus

↓

Power Conversion Section

↓

Variable-Frequency AC Output

↓

Large Three-Phase Motor

↓

Pump / Fan / Conveyor / Compressor / Process Machine

This operating principle allows the motor speed to be adjusted rather than keeping the motor permanently at one fixed operating speed.

For large industrial machinery, this can be especially useful when the production requirement changes during operation.

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4. Main Technical Parameters

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5. Electrical Rating

The most important electrical characteristic of this model is the 765 A current rating.

At the 690 VAC voltage class, this represents a high-power industrial motor-control system.

The approximate power-class relationship can be shown as follows:

The actual motor selection should be based primarily on motor full-load current, required overload capability, operating duty and application conditions.

A motor’s kW rating alone should not be used to determine drive compatibility.

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6. 690 VAC Operation

The 690 VAC class makes the drive suitable for high-power industrial motor systems.

Large industrial motors often use higher voltage levels because they allow high mechanical power to be delivered without requiring the extremely high currents that would occur at lower voltages.

Typical applications include:

• Mining conveyors.
• Large pumps.
• Industrial fans.
• Cement equipment.
• Large blowers.
• Material-handling systems.
• Process machinery.
• Large compressors.

The motor voltage and plant electrical distribution must be compatible with the drive application.

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7. 765 A Output Current

The 765 A output-current rating places this model in the high-capacity range.

For comparison:

The 765 A configuration is useful when a 710 A configuration does not provide sufficient current capacity, while a substantially larger drive is unnecessary.

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8. Frame 9 Construction

The drive uses Frame 9 construction.

Frame size is an important mechanical and electrical consideration.

A Frame 9 drive is considerably larger than ordinary low-power variable-frequency drives.

The installation therefore needs appropriate consideration for:

• Floor loading.
• Cabinet space.
• Cable routing.
• Ventilation.
• Maintenance clearance.
• Transportation.
• Lifting.
• Heat dissipation.

This is a major industrial electrical installation rather than a compact wall-mounted inverter.

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9. Approximate Dimensions

For engineering planning, the large Frame 9 packaged configuration can be considered approximately:

2453 mm high × 1200 mm wide × 800 mm deep

The actual finished cabinet may differ depending on the factory configuration and associated sections.

For installation drawings, foundation design, transportation planning or replacement work, the exact mechanical drawing should be used.

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10. Weight

The approximate equipment weight is:

1270 kg

This is a substantial piece of industrial equipment.

The weight should be considered when planning:

• Transportation.
• Unloading.
• Crane capacity.
• Forklift capacity.
• Floor loading.
• Installation position.
• Maintenance access.

A drive of this size should not be handled as ordinary electrical-panel equipment.

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11. Air-Cooled Design

The 20G11BF765JN4NNNNN uses an air-cooled architecture.

The cooling system is an important part of reliable operation because large power-conversion equipment produces considerable heat.

The installation should provide suitable airflow.

Particular attention should be paid to:

• Cooling fans.
• Air intake.
• Air exhaust.
• Cabinet ventilation.
• Electrical-room temperature.
• Dust accumulation.
• Airflow obstruction.
• Hot-air recirculation.

If hot exhaust air returns to the drive intake, the operating temperature can increase unnecessarily.

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12. Input Configuration

The model uses:

AC Input with Precharge

The precharge function is important in large power-electronic equipment because the DC bus contains substantial capacitance.

A controlled precharge process helps manage the initial energization of the DC bus.

This is particularly important at the power level represented by a 765 A drive.

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13. Filtered Configuration

The model uses a filtered configuration.

Filtering is useful in industrial environments where high-power switching equipment operates alongside sensitive electrical and control equipment.

Typical surrounding systems can include:

• PLC controllers.
• Industrial networks.
• Sensors.
• Instrumentation.
• Communication systems.
• Other variable-frequency drives.
• Motor control equipment.

Correct grounding, bonding and cable installation remain important even with filtering installed.

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14. Common-Mode Jumper

This configuration includes a common-mode jumper.

Common-mode considerations are important in variable-frequency drive installations because the high-frequency switching waveform can produce common-mode electrical effects through the motor cable and motor insulation system.

The configuration of the drive, motor, cable and grounding system should therefore be considered as one complete electrical system.

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15. Dynamic Braking

The specified model has:

Dynamic Braking: None

This is an important point when applying the drive to high-inertia machinery.

When a large motor decelerates, stored mechanical energy can flow back into the drive’s DC bus.

Applications requiring rapid stopping should therefore be evaluated carefully.

Examples include:

• Large conveyors.
• Large rotating machines.
• High-inertia fans.
• Material-handling equipment.
• Certain lifting or positioning systems.

If fast deceleration is required, an appropriate braking strategy must be considered separately.

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16. Door-Mounted HIM

The configuration includes a door-mounted HIM.

HIM stands for Human Interface Module.

A door-mounted operator interface is useful because operators and maintenance personnel can interact with the drive without necessarily opening the main cabinet.

The specified HIM arrangement has approximately:

IP54 / NEMA 12 protection.

This makes the operator interface better suited to an industrial cabinet environment than an exposed unprotected interface.

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17. Main Applications

The 20G11BF765JN4NNNNN can be applied to a broad range of large industrial machinery.

Typical areas include:

Mining

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

Cement

• Process fans.
• Conveyors.
• Blowers.
• Pumps.
• Material handling.

Aggregate

• Feed conveyors.
• Transfer systems.
• Large fans.
• Pumps.
• Processing equipment.

Water and Wastewater

• Large pumps.
• Water transfer.
• Process-water systems.
• Aeration blowers.

General Industry

• Compressors.
• Large fans.
• Process machines.
• Material-handling systems.
• High-power production equipment.

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18. Conveyor Applications

Large conveyors are one of the most appropriate application areas for a drive of this capacity.

A large conveyor can have considerable mechanical inertia.

Starting the motor abruptly can place significant stress on:

• Belts.
• Gearboxes.
• Couplings.
• Shafts.
• Bearings.
• Mechanical structures.

A variable-frequency drive allows the motor to accelerate progressively.

This can result in smoother starting behavior.

The operating speed can also be adjusted to match the required material flow.

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19. Mining Applications

Mining machinery frequently operates under heavy load for long periods.

A high-power drive can provide controlled motor operation for large equipment.

Potential applications include:

• Ore conveyors.
• Transfer conveyors.
• Dewatering pumps.
• Ventilation systems.
• Material-handling systems.
• Process equipment.

The drive can allow equipment speed to be adjusted according to production requirements.

For mining installations, environmental conditions should be evaluated carefully because dust, temperature and vibration can affect electrical equipment.

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20. Cement Applications

Large cement-processing facilities use many high-power motors.

The drive can be considered for:

• Large process fans.
• Blowers.
• Conveyors.
• Pumps.
• Material handling.
• Ventilation systems.

Variable-speed operation can help coordinate equipment with production requirements.

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21. Pump Applications

The 20G11BF765JN4NNNNN is suitable for evaluating large pump applications where variable-speed operation is required.

Potential applications include:

• Water transfer.
• Cooling-water circulation.
• Industrial process water.
• Raw-water pumping.
• Wastewater pumping.
• Large pumping stations.

A simplified operating relationship is:

Lower Process Demand → Lower Motor Speed

Normal Process Demand → Medium Motor Speed

Higher Process Demand → Higher Motor Speed

This allows the pump to respond to process requirements rather than continuously operating at one fixed speed.

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22. Fan and Blower Applications

Large fans and blowers can require considerable motor power.

Possible applications include:

• Furnace ventilation.
• Exhaust systems.
• Combustion-air systems.
• Industrial ventilation.
• Dust collection.
• Cooling systems.
• Aeration systems.

The variable-speed capability allows airflow to be adjusted according to process requirements.

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23. Compressor Applications

Large compressors can require substantial motor current.

The 765 A configuration can be considered for large compressor systems where the motor and compressor are designed for variable-speed operation.

Important considerations include:

• Motor full-load current.
• Starting torque.
• Minimum speed.
• Maximum speed.
• Acceleration time.
• Deceleration time.
• Compressor operating range.
• Duty cycle.

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24. Product Advantages

High Current Capacity

The 765 A current rating is the most obvious strength of the model.

It allows the drive to serve large industrial motors that exceed the capacity of smaller configurations.

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High-Voltage Industrial Operation

The 690 VAC voltage class is appropriate for large industrial motor systems.

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High Power

The approximately 750 kW normal-duty rating makes the unit suitable for very large machinery.

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Heavy-Duty Capability

The approximately 630 kW heavy-duty class provides substantial capacity for demanding applications.

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Variable-Speed Control

Motor speed can be adjusted according to the process requirement.

This is particularly useful for pumps, fans, conveyors and other variable-load machines.

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Controlled Acceleration

Large motors can be started progressively instead of being subjected to an abrupt starting condition.

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Door-Mounted Operator Interface

The door-mounted HIM provides convenient access for operators and maintenance personnel.

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Air-Cooled Architecture

Air cooling provides a practical approach for large industrial installations where adequate ventilation is available.

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Filtered Configuration

The filtered arrangement is suitable for industrial environments where electromagnetic compatibility is important.

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Large Industrial Application Range

The drive can be considered for many industries, including:

• Mining.
• Cement.
• Aggregate.
• Water treatment.
• Manufacturing.
• Material handling.
• Process industries.

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25. Five Related Models from the Same Series

The following models are useful for comparison within the same high-power PowerFlex 755 family.

These are useful comparison points when determining whether a project needs lower or higher current capacity.

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26. Five Closely Related 765 A Configurations

Because the 765 A rating is the central electrical characteristic, closely related catalog configurations can also be useful when evaluating replacements.

The suffixes are important.

Even if two models have identical voltage, current and frame ratings, they should not automatically be regarded as direct replacements.

The complete catalog number should be checked against the installed equipment.

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27. Five Same-Brand Representative Models

For broader comparison, the following are representative models from the same brand family and are useful when choosing between different power levels and applications.

The smaller models are intended for substantially lower-power applications and should not be considered electrical substitutes for the 765 A Frame 9 configuration.

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28. Model Selection by Application

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29. Comparison of High-Power Models

The 765 A model sits between the 710 A and 795 A configurations and can be a practical choice when the motor’s operating current is in this range.

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30. Motor Selection Considerations

Before selecting this drive for a motor, the following parameters should be checked.

For a high-power drive, motor current is generally more useful for selection than simply comparing nominal horsepower or kilowatts.

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31. Installation Requirements

The large physical size and weight of this model require careful installation planning.

Floor Loading

The approximate 1270 kg weight should be considered when evaluating the supporting floor.

Transportation

The equipment should be transported using suitable industrial lifting equipment.

Cabinet Clearance

Adequate clearance should be provided for:

• Door opening.
• Cable installation.
• Maintenance.
• Cooling.
• Component replacement.

Ventilation

The electrical room should have sufficient capacity to remove the heat generated by the drive.

Cable Routing

High-power cables should be properly sized and routed.

Grounding

Grounding and bonding should be designed as part of the complete installation.

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32. Maintenance

A high-power drive should receive regular preventive inspection.

Preventive maintenance is especially important for large production machines because an unexpected drive failure can interrupt an entire production line.

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33. Energy and Process Advantages

The main benefit of variable-speed control is not simply motor-speed adjustment.

It also provides the possibility of matching motor operation to the actual process.

For example:

Production Demand Falls

↓

Motor Speed Reduced

↓

Machine Output Reduced

This is often more flexible than continuously running the motor at full speed.

For pumps and fans, this operating principle can potentially provide significant energy benefits depending on the mechanical system.

Actual energy savings should always be calculated from the specific pump, fan, piping, process and operating profile.

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34. Advantages in Large Conveyor Systems

A conveyor system may have substantial stored mechanical energy.

Controlled acceleration can reduce the severity of the starting event.

Potential benefits include:

• Smoother acceleration.
• Reduced belt shock.
• Reduced gearbox stress.
• Reduced coupling stress.
• Improved material flow.
• Adjustable conveyor speed.
• Better coordination with other conveyors.

For long conveyor systems, this can be an important operational advantage.

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35. Advantages in Pump Systems

For pumps, variable-speed operation allows process demand to be followed more closely.

Typical control variables may include:

• Pressure.
• Flow.
• Water level.
• Process demand.

The drive can therefore become part of a closed-loop process-control system.

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36. Advantages in Fan Systems

For fans and blowers, motor speed can be changed according to airflow requirements.

This can provide:

• Better airflow control.
• Smoother operation.
• Lower operation at reduced demand.
• Reduced mechanical stress.
• Potential energy savings.

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37. Advantages in Heavy Industrial Machinery

The 20G11BF765JN4NNNNN is especially attractive for machines that combine:

• High motor power.
• High current.
• Long operating hours.
• Large mechanical inertia.
• Variable production demand.
• Centralized control requirements.

Its 765 A rating gives it substantial operating capacity.

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38. Product Strengths at a Glance

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39. Complete Parameter Summary

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40. Final Product Evaluation

The 20G11BF765JN4NNNNN is a large-capacity variable-frequency AC drive designed for demanding industrial motor applications.

Its key specifications are:

690 VAC

765 A

Frame 9

Air Cooled

750 kW approximately — Normal Duty

630 kW approximately — Heavy Duty

AC Input with Precharge

Filtered

CM Jumper Installed

No Dynamic Braking

Type 1 Enclosure

IP20 Drive Protection

Door-Mounted IP54 / NEMA 12 HIM

600 mm Deep MCC Style

Approximately 2453 × 1200 × 800 mm

Approximately 1270 kg

The model is particularly appropriate for large conveyors, mining machinery, pumps, fans, blowers, compressors, cement equipment, aggregate systems, water-treatment equipment and large process machinery.

Its major advantage is the combination of a 765 A current rating and 690 VAC operating class, giving it the capacity to control very large industrial motors.

The Frame 9 construction also makes it a substantial industrial installation. Space, ventilation, floor loading, cable routing, maintenance access and lifting arrangements should all be considered before installation.

The door-mounted HIM is another practical feature for industrial operation because the operator interface can be accessed from the cabinet door while the main electrical enclosure remains closed.

The filtered configuration and installed common-mode jumper are also relevant when integrating the drive into a larger industrial electrical system.

For high-inertia applications, the fact that this particular configuration has no dynamic braking should be considered carefully. If the machine needs very rapid stopping, the braking arrangement should be evaluated before final selection.

When comparing this model with the 590 A, 650 A, 710 A, 765 A and 795 A configurations, the motor’s actual full-load current and operating duty should be the primary selection criteria.

For replacement work, the complete catalog number 20G11BF765JN4NNNNN is important. Another 690 VAC / 765 A drive may have a similar electrical rating but may differ in operator interface, braking, filtering, common-mode configuration, enclosure arrangement or other factory options.

Overall, the 20G11BF765JN4NNNNN is best viewed as a high-power, large-frame industrial variable-speed drive for major motor-driven machinery, particularly where controlled acceleration, adjustable motor speed and integration with an industrial control system are required.