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20G11BF795JN0NNNNN — Detailed Product Overview, Technical Parameters, Applications, Advantages and Related Models

1. Product Overview

The 20G11BF795JN0NNNNN is a high-power air-cooled AC drive from the PowerFlex 755 series.

It is designed for large three-phase motor applications where high current capacity, variable-speed operation, controlled acceleration, process regulation and reliable industrial motor control are required.

This particular configuration is a 690 VAC, 795 A, Frame 9 packaged drive. It is intended for large industrial installations rather than compact machine-level applications.

The drive is suitable for demanding equipment such as large conveyors, pumps, fans, blowers, compressors, material-handling systems, mining machinery, cement equipment and other heavy industrial rotating machinery.

The product uses an air-cooled architecture and a large cabinet-style construction. Its high current rating makes it appropriate for motors in the several-hundred-kilowatt range.

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2. Brand and Product Series

The PowerFlex 755 series is designed for applications requiring substantially greater motor-control capability than compact variable-frequency drives.

It is particularly appropriate where motor power, torque, current, process control and integration requirements are relatively high.

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3. Model Number Interpretation

The catalog number contains a number of configuration characteristics.

The complete catalog number is:

20G11BF795JN0NNNNN

The important electrical and mechanical characteristics can be summarized as follows:

The suffix is important when selecting a replacement.

A model with the same current rating and voltage rating is not necessarily an exact replacement if its filtering, common-mode capacitor configuration, braking arrangement, terminals, enclosure or operator-interface configuration is different.

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4. Main Technical Parameters

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5. Power Rating

The drive has three commonly referenced duty ratings.

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

A motor application should not be selected solely from the motor’s kW value.

Motor current, overload requirements, torque requirements, acceleration, operating cycle and ambient conditions should also be considered.

For a demanding application, the 795 A current rating is often more important than simply matching the motor’s nominal power.

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6. 690 VAC Electrical Class

The 690 VAC class is intended for large industrial electrical systems.

Higher motor voltage is particularly useful at high power because it allows a large motor’s power to be transmitted with a more manageable current level compared with a lower-voltage system.

This makes the drive appropriate for large industrial motors used in:

• Mining.
• Cement production.
• Water treatment.
• Heavy manufacturing.
• Material handling.
• Large pumping stations.
• Industrial ventilation.
• Process equipment.
• Large conveyor systems.

The motor voltage, insulation system, cable arrangement and grounding system should be compatible with the selected drive.

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7. 795 A Current Rating

The 795 A current rating is one of the key characteristics of this model.

This places the drive in a very high-power industrial category.

A high-current drive is useful where the motor requires substantial current during normal operation or during demanding acceleration and load conditions.

The 795 A version can therefore be considered when lower-current versions do not provide sufficient capacity.

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8. Frame 9 Construction

The drive uses Frame 9 construction.

This is a large physical platform intended for high-power industrial equipment.

Compared with smaller drive frames, a Frame 9 installation requires significantly more attention to:

• Cabinet space.
• Cable entry.
• Ventilation.
• Heat dissipation.
• Maintenance access.
• Lifting.
• Transportation.
• Floor loading.
• Electrical clearance.

The physical size of the complete packaged drive is a major consideration when planning a new installation or replacing an existing unit.

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9. Dimensions and Weight

For preliminary equipment planning, the large Frame 9 package can be treated as approximately:

2453 mm × 1200 mm × 800 mm

The approximate weight is:

1270 kg

Because packaged-drive dimensions and shipping weight can vary with the exact enclosure and factory configuration, these values should be treated as planning figures rather than final installation dimensions.

For a replacement project, the final mechanical drawing should be checked before preparing the foundation, transport route or lifting arrangement.

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10. Air-Cooled Design

The product uses an air-cooled design.

This is an important feature for large industrial installations.

Instead of requiring a dedicated liquid-cooling circuit, heat generated by the drive’s power electronics is removed through forced airflow.

The installation should therefore provide suitable:

• Air circulation.
• Cooling capacity.
• Cabinet ventilation.
• Ambient temperature control.
• Dust management.
• Exhaust-air management.

The cooling system is particularly important because a 795 A drive can generate substantial heat during operation.

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11. Filtered Configuration

The 20G11BF795JN0NNNNN uses a filtered configuration.

Filtering can be useful in industrial environments where high-power switching equipment operates close to:

• PLC systems.
• Industrial Ethernet.
• Instrumentation.
• Sensors.
• Control cabinets.
• Communication equipment.
• Other power electronics.

The filter is only one part of an EMC strategy.

Good grounding, bonding, cable separation, motor-cable selection and proper installation practices remain important.

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12. Common-Mode Capacitor Jumper Installed

A notable difference between this model and some related configurations is:

CM Capacitor Jumper Installed

This configuration affects the electrical relationship between the drive, motor and grounding system.

It should therefore be considered when replacing another drive.

For example, a 795 A model with a different CM capacitor configuration should not automatically be treated as electrically identical simply because the voltage and current ratings are the same.

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13. AC Input with Precharge

The drive uses an AC input with precharge.

Precharge is used to control the initial charging of the DC bus.

This is especially important in a high-power drive because the DC-link capacitors represent a substantial electrical load during startup.

The precharge arrangement helps manage the initial energization sequence of the drive.

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14. DC Terminals

This configuration includes DC terminals.

That is useful for certain system architectures where DC-bus connections are required.

However, the presence of DC terminals does not mean that every installation should use them.

The actual system configuration must take into account:

• DC bus requirements.
• Braking requirements.
• Regeneration.
• Power architecture.
• Protection.
• Cable sizing.
• System coordination.

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15. Dynamic Braking

The model is configured with:

Dynamic Braking: None

This is important for applications with significant rotating inertia.

When a motor decelerates, energy can be returned toward the drive’s DC bus.

If rapid deceleration is required, the complete braking strategy needs to be evaluated.

This is especially relevant to:

• Large conveyors.
• High-inertia fans.
• Large centrifuges.
• Material-handling machinery.
• Heavy rotating equipment.

The absence of an integrated dynamic-braking configuration should therefore be considered during system design.

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16. Embedded EtherNet/IP

The model is associated with embedded EtherNet/IP capability.

This is useful in modern industrial automation systems.

EtherNet/IP can provide communication between the drive and a control system for functions such as:

• Start and stop commands.
• Speed references.
• Status monitoring.
• Fault information.
• Drive parameters.
• Process data.
• Diagnostic information.

This makes the drive easier to integrate into a larger automated production system.

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17. No HIM Configuration

The catalog configuration specifies:

Blank — No HIM

HIM refers to the Human Interface Module.

Therefore, this particular catalog configuration does not include a standard local operator interface as part of the selected configuration.

The drive can instead be managed through:

• Control-system communication.
• External controls.
• Engineering tools.
• Other compatible interface equipment.

This can be useful when the drive is installed inside a larger automation architecture.

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18. Enclosure and Protection

The Type 1/IP20 arrangement is generally associated with indoor electrical installations.

The surrounding electrical room should provide appropriate environmental protection from:

• Excessive dust.
• Water.
• Condensation.
• Corrosive substances.
• Extreme temperatures.

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19. Product Introduction

The 20G11BF795JN0NNNNN is essentially a high-power electronic motor-control system.

It receives three-phase AC power and uses power electronics to control the frequency and voltage supplied to a connected AC motor.

A simplified system is:

690 VAC Three-Phase Supply

↓

AC Input / Precharge

↓

DC Bus

↓

Power Conversion Section

↓

Variable-Frequency AC Output

↓

Large Three-Phase Motor

↓

Industrial Machine

The ability to vary the motor’s operating speed allows the machine to respond more closely to the actual process requirement.

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20. Typical Applications

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21. Conveyor Applications

Large conveyors are one of the strongest application areas for a drive of this size.

A long conveyor can have considerable mechanical inertia.

Starting the motor directly at full speed can produce substantial mechanical stress.

Variable-frequency operation allows the motor to accelerate in a controlled manner.

Potential benefits include:

• Smoother starting.
• Reduced belt shock.
• Reduced gearbox stress.
• Reduced coupling stress.
• Adjustable belt speed.
• Better material-flow control.
• Improved coordination with upstream and downstream equipment.

For mining and bulk-material applications, these characteristics can be particularly useful.

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22. Mining Applications

The high current rating makes the drive suitable for consideration in large mining equipment.

Potential applications include:

• Ore conveyors.
• Overland conveyors.
• Transfer conveyors.
• Dewatering pumps.
• Ventilation fans.
• Material-handling systems.
• Processing equipment.

Mining installations can be demanding because of dust, vibration, temperature variation and long operating periods.

The electrical room and cooling system therefore need to be properly designed.

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23. Cement Applications

Large cement facilities use numerous high-power motors.

Possible applications include:

• Exhaust fans.
• Process fans.
• Large conveyors.
• Blowers.
• Pumps.
• Material-handling equipment.
• Process machinery.

Variable-speed operation can help coordinate machine output with production demand.

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24. Pump Applications

Large pumps often operate under changing process conditions.

The drive can adjust motor speed according to:

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

Potential benefits include:

• Flexible flow control.
• Improved pressure regulation.
• Reduced mechanical shock.
• Smooth starting.
• Potential energy savings.

Actual energy savings depend on the pump characteristics and operating point.

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25. Fan and Blower Applications

Large fans and blowers can consume considerable electrical power.

Running them continuously at full speed may not always be necessary.

Variable-speed operation can allow the equipment to respond to actual demand.

Typical applications include:

• Industrial ventilation.
• Exhaust systems.
• Furnace fans.
• Combustion-air fans.
• Dust collection.
• Wastewater aeration.
• Process-air systems.

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26. Compressor Applications

Large compressors may also use variable-speed drives.

However, compressor applications should be evaluated carefully because compressor torque characteristics vary considerably.

Important parameters include:

The drive should be selected according to the actual compressor operating profile.

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27. Main Advantages

27.1 High 795 A Current Rating

The 795 A rating allows the drive to control very large AC motors.

This is one of its most important advantages.

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27.2 High Power Capacity

The approximate ratings of:

• 900 kW light duty
• 800 kW normal duty
• 710 kW heavy duty

provide substantial capacity for large industrial machines.

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27.3 690 VAC Operation

The 690 VAC class is suitable for large industrial motor systems.

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27.4 Variable-Speed Operation

Motor speed can be adjusted according to process requirements.

This is particularly useful for pumps, fans and conveyors.

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27.5 Controlled Acceleration

The drive can provide controlled acceleration instead of relying on a simple fixed-speed start.

This can reduce mechanical shock.

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27.6 Industrial Networking

Embedded EtherNet/IP capability makes the drive suitable for integration into automated industrial systems.

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27.7 High-Power Packaged Construction

The packaged Frame 9 configuration provides a substantial industrial solution for large motor systems.

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27.8 Filtered Configuration

The filtered configuration can help when the drive is installed within a larger industrial electrical system containing sensitive control equipment.

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27.9 DC Terminal Availability

The DC terminals provide additional flexibility for certain power-system architectures.

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28. Advantages for Large Conveyor Systems

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29. Advantages for Pump Systems

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30. Advantages for Fan Systems

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31. Mechanical Installation

Because this is a very large drive, installation should be planned carefully.

The approximate mechanical envelope is:

2453 mm high

1200 mm wide

800 mm deep

and the approximate weight is:

1270 kg

These values are suitable for preliminary planning; final mechanical drawings should be checked before construction or replacement work.

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32. Cooling and Environmental Requirements

The cooling system is an important part of the installation.

The electrical room should prevent excessive heat accumulation.

Attention should be given to:

• Ambient temperature.
• Airflow.
• Fan operation.
• Dust.
• Cabinet ventilation.
• Exhaust-air routing.
• Filter condition.
• Room HVAC capacity.

If hot exhaust air is allowed to circulate back into the drive’s air intake, operating temperature can rise significantly.

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33. Maintenance Considerations

A drive of this size should be incorporated into a planned maintenance program.

For large production systems, recurring drive faults should be investigated rather than repeatedly reset.

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34. Five Recommended Same-Series / Related Models

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

The closest direct comparison is the 20G11BF795JN4NNNNN, because it retains the same basic 795 A / 690 VAC power class while changing the catalog configuration.

The 650 A, 710 A and 765 A models are useful when the motor’s actual current requirement is lower.

The 960 A version is useful when additional current capacity is required.

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35. Five Same-Series Comparison Models

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36. Five Popular Same-Brand Models

For a broader product comparison, the following representative models cover different power levels and applications.

The smaller models in this table are not direct electrical replacements for the 795 A drive.

They are included as representative products from the same brand for comparison across different application sizes.

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37. Comparison of 795 A and Nearby Models

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38. Why Choose the 795 A Version?

The 795 A version occupies a useful position within the high-power range.

If a 650 A or 710 A unit does not provide enough current capacity, moving to the 765 A or 795 A class can provide additional operating margin.

At the same time, a 960 A drive may be unnecessary if the motor does not require that much capacity.

Therefore, the 795 A version can be a practical selection for a large motor whose electrical requirements are close to the upper range of the 765 A configuration.

The decision should still be based on actual motor nameplate data and the applicable duty rating.

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39. Selection Considerations Before Purchase or Replacement

Before replacing an existing drive with 20G11BF795JN0NNNNN, the following items should be checked.

The complete catalog number should always be compared rather than matching only the first part of the model.

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40. Complete Technical Parameter Table

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41. Product Advantages Summary

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42. Overall Product Assessment

The 20G11BF795JN0NNNNN is a large, high-capacity PowerFlex 755 AC drive intended for serious industrial motor-control applications.

Its most important characteristics are the 690 VAC voltage class, 795 A current rating, approximately 900 kW light-duty capacity, approximately 800 kW normal-duty capacity and approximately 710 kW heavy-duty capacity.

The Frame 9 air-cooled construction makes it suitable for large industrial installations where a compact drive is not sufficient.

The combination of filtered operation, installed common-mode capacitor jumper, AC input with precharge, DC terminals and embedded EtherNet/IP gives this configuration a broad range of integration possibilities.

It is particularly well suited to large conveyors, mining machinery, pumps, fans, blowers, cement equipment, water systems and other large rotating industrial machines.

One of its strongest practical advantages is the ability to combine a very high motor-current rating with variable-speed control.

For a conveyor, this can mean controlled acceleration and smoother material handling.

For a pump, it can provide adjustable flow and pressure control.

For a fan or blower, it can provide variable airflow according to process demand.

For mining and cement equipment, its high-current capacity can accommodate very large motors used in continuous industrial production.

The physical size should not be underestimated.

With an approximate overall envelope of 2453 × 1200 × 800 mm and an approximate weight of 1270 kg, this is heavy industrial equipment that requires appropriate floor loading, transportation, lifting, ventilation and maintenance planning.

The No Dynamic Braking configuration is another important selection point. Applications involving rapid stopping or significant regenerative energy should be evaluated separately to determine whether additional braking equipment or a different configuration is necessary.

The 20G11BF795JN0NNNNN can therefore be viewed as a high-power solution for applications where motor current, process control, industrial networking and large-scale mechanical equipment are the primary requirements.

For replacement work, the complete catalog number should be matched carefully. In particular, 795 A, 690 VAC, Frame 9, filtered configuration, CM jumper installed, DC terminals, braking configuration, enclosure and operator-interface configuration should all be checked before treating another model as a direct substitute.