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20G11LF795AN0NNNNN — PowerFlex 755 High-Power AC Drive

1. Product Overview

The 20G11LF795AN0NNNNN is a high-power AC variable frequency drive from the PowerFlex 755 series.

It is designed for large three-phase AC motor applications where high current capacity, adjustable motor speed, controlled acceleration and deceleration, process flexibility, and industrial automation integration are required.

With a rated current of 795 A, this model belongs to the large-power section of the PowerFlex 755 family. It is intended for demanding industrial equipment such as large pumps, fans, blowers, conveyors, process machinery, water-treatment equipment, material-handling systems, and other large rotating machines.

The model is an air-cooled, 690 VAC-class, three-phase drive. Its configuration is based on a large-frame industrial design and an approximately 800 mm deep MCC-style mechanical arrangement.

The complete catalog number is important because the letters and numbers in the suffix identify the particular electrical and mechanical configuration.

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2. Product Identification

Item	Specification
Brand	Allen-Bradley
Product Family	PowerFlex 750-Series
Product Series	PowerFlex 755
Catalog Number	20G11LF795AN0NNNNN
Product Type	High-Power AC Variable Frequency Drive
Input Type	AC input with precharge
Input Voltage Class	690 VAC
Input Phase	Three Phase
Rated Current	795 A
Cooling Method	Air Cooled / Forced Air
Frame	Frame 9 class
Mechanical Style	MCC Style
Approximate Depth	800 mm
Protection Style	Type 1 / IP20 class
Filter	Filtered configuration
CM Jumper	Removed
Operator Interface	No HIM / blank configuration
Motor Type	Three-phase AC motor
Drive Duty	Light Duty / Normal Duty / Heavy Duty
Main Application	Large industrial motor control
Installation	Industrial electrical cabinet or equipment room
Weight	Configuration dependent
Weight Unit	kg

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3. Product Series

The 20G11LF795AN0NNNNN belongs to the PowerFlex 755 series.

The PowerFlex 755 series is intended for industrial variable-speed motor applications where a higher level of performance and control flexibility is required.

Compared with smaller drives, this series is designed to handle significantly larger motors and higher electrical loads.

The series can be applied to a wide variety of industrial machinery, including:

• Pumps
• Fans
• Blowers
• Conveyors
• Material-handling equipment
• Process machinery
• Water-treatment equipment
• Mining equipment
• Industrial ventilation
• Large production machinery

The 795 A model is positioned toward the high-current end of the series.

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4. Main Electrical Parameters

Parameter	Specification
Catalog Number	20G11LF795AN0NNNNN
Input Voltage	690 VAC class
Input Phase	3 Phase
Rated Current	795 A
Input Type	AC input with precharge
Output	Variable-frequency three-phase AC
Motor Control	Adjustable-speed AC motor control
Cooling	Forced Air
Frame	Frame 9
Installation Style	MCC style
Filter	Filtered
CM Jumper	Removed
HIM	None / blank configuration
Drive Class	High Power
Frequency Control	Variable-frequency output
Acceleration	Adjustable
Deceleration	Adjustable
Motor Speed Control	Adjustable
Braking	Configuration dependent
Communication	Industrial automation integration
Protection	Configuration dependent
Motor Feedback	Application/configuration dependent

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5. Power Rating

One of the most important characteristics of this model is its 795 A current rating.

The corresponding motor power depends on the selected duty.

The commonly associated power classes are approximately:

Duty	Approximate Power Rating
Light Duty	900 kW
Normal Duty	800 kW
Heavy Duty	710 kW

These ratings should be considered duty-based application ratings rather than a universal motor rating.

The actual motor selection must take into account the motor nameplate current, motor voltage, overload requirement, ambient conditions, application duty, acceleration requirements, and other operating conditions.

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6. Mechanical Parameters

The model uses a large industrial mechanical arrangement.

Its basic mechanical characteristics are shown below.

Mechanical Parameter	Specification
Frame	Frame 9
Mechanical Style	MCC Style
Cooling	Forced Air
Approximate Depth	800 mm
Width	Configuration dependent
Height	Configuration dependent
Overall Footprint	Configuration dependent
Mounting	Industrial fixed installation
Cabinet Installation	Suitable
Service Access	Required
Ventilation Space	Required
Cable Space	Required
Weight	Configuration dependent
Weight Unit	kg

The approximately 800 mm depth is an important characteristic of this product configuration.

The actual overall dimensions should not be assumed from depth alone because the installed equipment may include additional cabinet sections, cable compartments, disconnect equipment, bus structures, or other accessories.

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7. Dimensions

The product is associated with an 800 mm deep MCC-style arrangement.

For planning purposes, the dimensional information can be summarized as follows:

Dimension	Specification
Depth	Approximately 800 mm
Width	Configuration dependent
Height	Configuration dependent
Cabinet Width	Configuration dependent
Cabinet Height	Configuration dependent
Service Clearance	Required
Ventilation Clearance	Required
Cable Clearance	Required
Overall Installed Size	Configuration dependent

The 800 mm value represents the approximate depth class of the drive configuration.

It should not be interpreted as the complete external dimensions of every possible installation.

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8. Weight

The exact weight in kg is configuration dependent.

This is particularly important for a high-power Frame 9 drive because the final installed assembly may contain additional electrical and mechanical components.

Possible contributors to the total installed weight include:

• Main power section
• Cooling equipment
• Internal bus structure
• Input terminals
• Output terminals
• Cabinet structure
• Mounting components
• Internal wiring
• Protection equipment
• Optional braking components
• Other selected accessories

Weight Parameter	Value
Drive Weight	Configuration dependent
Complete Assembly Weight	Configuration dependent
Cabinet Weight	Configuration dependent
Shipping Weight	Configuration dependent
Installed Weight	Configuration dependent
Unit	kg

For engineering calculations, lifting arrangements, transportation, cabinet foundations, and floor-loading calculations, the weight of the exact physical assembly should be used rather than an assumed generic value.

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9. Product Structure

The basic operating structure of the drive can be understood as:

Three-Phase 690 VAC Input

↓

Input / Precharge Section

↓

DC Link

↓

Power Inverter

↓

Variable-Frequency Three-Phase Output

↓

Large AC Motor

↓

Pump / Fan / Blower / Conveyor / Process Equipment

The drive converts the incoming electrical power into a controlled output suitable for adjustable-speed motor operation.

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10. Product Introduction

The main purpose of the 20G11LF795AN0NNNNN is to control a large AC motor.

A conventional fixed-speed motor installation normally connects the motor to a fixed-frequency electrical supply.

A variable frequency drive changes the frequency and voltage supplied to the motor.

This makes it possible to adjust motor speed according to the actual operating requirements of the machine.

For example, a pump does not always need to operate at maximum speed.

A large fan may only require partial airflow.

A conveyor may need different speeds during different production stages.

A blower may need to adjust its output according to process demand.

In these situations, variable-speed control provides substantially greater operating flexibility.

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11. Variable-Speed Control

Variable-speed operation is one of the main advantages of the product.

The motor can operate at different speeds instead of being limited to one normal operating speed.

Typical applications include:

• Speed adjustment
• Process synchronization
• Flow control
• Pressure control
• Airflow control
• Conveyor speed control
• Production-rate adjustment
• Controlled acceleration
• Controlled deceleration

This makes the drive particularly useful in industrial processes where operating conditions change continuously.

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12. Pump Applications

Large pumps are a major application area for high-power drives.

The 20G11LF795AN0NNNNN can be considered for applications such as:

• Water pumping
• Raw-water pumping
• Process-water circulation
• Cooling-water circulation
• Wastewater pumping
• Industrial transfer pumping
• Mine dewatering
• Large water-distribution systems
• Process-fluid circulation

Variable-speed operation allows the pump motor to operate according to the required process conditions.

For example, when less flow is required, the motor can operate at a reduced speed rather than continuously running at maximum speed.

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13. Fan Applications

Large industrial fans can require very substantial motor power.

Potential applications include:

• Factory ventilation
• Industrial exhaust
• Process ventilation
• Furnace ventilation
• Cooling systems
• Air-handling systems
• Mine ventilation
• Process-air systems

The drive can adjust fan speed to meet the required airflow.

This can improve operating flexibility and may reduce energy consumption when the process does not require full airflow.

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14. Blower Applications

Large blowers are another important application.

Potential uses include:

• Wastewater aeration
• Industrial air supply
• Process-air systems
• Pneumatic conveying
• Combustion-air systems
• Industrial ventilation
• Large air-handling equipment

The drive allows blower speed to be adjusted according to process requirements.

This is particularly useful where airflow demand changes during normal plant operation.

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15. Conveyor Applications

Large conveyors often have high mechanical inertia.

Direct starting can create considerable mechanical stress.

A variable frequency drive can provide controlled acceleration.

Potential benefits include:

• Smooth acceleration
• Reduced mechanical shock
• Reduced belt stress
• Reduced gearbox stress
• Improved speed control
• Controlled stopping
• Better production synchronization

This makes the product suitable for large material-handling systems.

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16. Mining Applications

High-current drives are frequently associated with large mining machinery.

Potential applications include:

• Large conveyors
• Mine dewatering pumps
• Ventilation fans
• Large blowers
• Material-handling equipment
• Processing machinery

Mining installations can be demanding because of dust, temperature variation, continuous operation, mechanical loading, and difficult maintenance conditions.

Correct enclosure, cooling, installation and environmental protection are therefore important.

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17. Water and Wastewater Applications

Large water-treatment facilities can contain many high-power motors.

The product can be considered for:

• Raw-water pumps
• Distribution pumps
• Transfer pumps
• Wastewater pumps
• Aeration blowers
• Cooling pumps
• Large ventilation fans

Variable-speed control can help match equipment output with changing water flow or process requirements.

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18. Industrial Process Applications

Large process plants commonly use high-power motors in continuous-duty machinery.

Potential applications include:

• Process pumps
• Process fans
• Blowers
• Conveyors
• Cooling systems
• Material-handling equipment
• Production machinery
• Large ventilation systems

The drive can provide a controlled interface between the plant automation system and the motor.

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19. Main Product Advantages

19.1 High Current Capacity

The 795 A current rating places the model in a high-power industrial category.

It is suitable for motors that require substantial electrical current.

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19.2 690 VAC Class

The 690 VAC class is appropriate for high-power motor installations.

Higher-voltage motor systems can be useful for large industrial motors because the same power can be transmitted with lower current than would be required at a lower voltage.

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19.3 Large Motor Capability

The drive is designed for very large motor applications.

Its approximate duty ratings reach the several-hundred-kilowatt range.

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19.4 Adjustable Motor Speed

The motor speed can be adjusted to suit process requirements.

This is particularly valuable for pumps, fans and blowers.

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19.5 Controlled Acceleration

The drive can provide controlled acceleration rather than applying the motor to full operating conditions immediately.

This can help reduce mechanical stress.

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19.6 Controlled Deceleration

Controlled deceleration allows the motor and machine to stop according to a defined operating profile.

This is especially useful for high-inertia machinery.

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19.7 Industrial Automation Integration

The drive can be integrated into an industrial automation architecture.

A control system can exchange operating commands and status information with the drive.

Typical information includes:

• Run command
• Stop command
• Speed reference
• Actual speed
• Output current
• Drive status
• Warning status
• Fault status
• Operating condition

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19.8 High-Power Industrial Construction

The Frame 9 configuration and large MCC-style arrangement are appropriate for substantial industrial installations.

The design is intended for fixed industrial equipment rather than small portable machinery.

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20. Typical Operating Applications

Application	Suitability	Main Benefit
Large Pump	Excellent	Flow and pressure control
Large Fan	Excellent	Airflow adjustment
Large Blower	Excellent	Variable air delivery
Large Conveyor	Excellent	Controlled acceleration
Water Treatment	Excellent	Pump and blower control
Wastewater	Excellent	Pump and aeration control
Mining	Suitable	High-power motor control
Material Handling	Suitable	Variable-speed operation
Process Plant	Suitable	Process motor control
Small Machinery	Generally unsuitable	Excessive capacity

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21. Automation and Control

A typical control architecture can be represented as:

Industrial Controller

↓

Industrial Communication Network

↓

PowerFlex 755 Drive

↓

795 A-Class Motor Control

↓

AC Motor

↓

Industrial Machine

The controller can provide commands to the drive while the drive provides feedback information.

This makes the product suitable for integration into larger automated production systems.

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22. Typical Drive Feedback

Feedback	Purpose
Motor Speed	Monitoring motor operation
Speed Reference	Checking requested speed
Output Current	Monitoring motor load
Drive Status	Checking operating state
Fault Status	Troubleshooting
Warning Status	Preventive action
Drive Temperature	Thermal monitoring
Communication Status	Network diagnostics
Run Status	Process sequencing
Operating Condition	General equipment monitoring

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23. Protection and Monitoring

Large industrial motors require appropriate protection.

The drive can provide monitoring and protective functions associated with motor and drive operation.

Possible areas include:

• Overcurrent
• Overload
• Drive temperature
• Electrical faults
• Warning conditions
• Communication faults
• Operating abnormalities

Correct protection parameters should be configured according to the motor nameplate and actual machine requirements.

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24. Braking Considerations

Large industrial motors may store a considerable amount of mechanical energy.

This is particularly important when controlling:

• Large conveyors
• High-speed fans
• Large blowers
• High-inertia machines
• Large rotating process equipment

If rapid stopping is required, the braking method must be selected according to:

• Motor speed
• Load inertia
• Stopping time
• Braking frequency
• Regenerative energy
• Mechanical load
• Braking equipment

The exact braking configuration must therefore be considered during system design.

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25. Cooling

The product uses an air-cooled / forced-air cooling arrangement.

High-power electronic equipment produces heat during operation.

Adequate ventilation is therefore important.

The installation should provide:

• Adequate airflow
• Suitable ambient temperature
• Correct ventilation clearance
• Clean air passages
• Accessible cooling equipment
• Appropriate cabinet ventilation

Dust and contamination should be controlled because they can reduce cooling performance.

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26. Installation Considerations

Installation Factor	Requirement
Supply Voltage	690 VAC class
Supply Phase	Three Phase
Motor Voltage	Must match application
Motor Current	Must be compatible with drive rating
Motor Power	Must match selected duty
Grounding	Required
Input Protection	Required
Motor Cable	Correctly sized
Cooling	Adequate forced-air ventilation
Cabinet Space	Large industrial space required
Depth	Approximately 800 mm
Width	Configuration dependent
Height	Configuration dependent
Weight	Configuration dependent, kg
Service Clearance	Required
Cable Clearance	Required
Environmental Conditions	Must be evaluated

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27. Maintenance

Regular maintenance is important for high-power variable frequency drives.

Typical maintenance activities include:

• Checking cooling airflow
• Inspecting ventilation passages
• Checking cooling fans
• Checking electrical connections
• Inspecting cable terminals
• Reviewing fault history
• Reviewing warning history
• Checking operating temperature
• Inspecting the installation environment
• Removing accumulated dust where appropriate

Maintenance should be performed by qualified personnel following appropriate electrical safety procedures.

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28. Five Same-Series or Closely Related Models

The following models are closely related high-power PowerFlex 755 configurations.

They are useful when comparing current capacity and motor-power requirements.

Model	Series	Voltage	Current	LD Power	ND Power	HD Power	Dimensions	Weight (kg)
20G11LF710AN0NNNNN	PowerFlex 755	690 VAC	710 A	800 kW	710 kW	590 kW	800 mm depth class	Configuration dependent
20G11LF765AN0NNNNN	PowerFlex 755	690 VAC	765 A	850 kW	750 kW	630 kW	800 mm depth class	Configuration dependent
20G11LF795JN0NNNNN	PowerFlex 755	690 VAC	795 A	900 kW	800 kW	710 kW	800 mm depth class	Configuration dependent
20G11LF825AN0NNNNN	PowerFlex 755	690 VAC class	825 A	High-power class	High-power class	High-power class	800 mm depth class	Configuration dependent
20G11LF960AN0NNNNN	PowerFlex 755	690 VAC	960 A	1000 kW	900 kW	800 kW	800 mm depth class	Configuration dependent

The closest comparison to the target model is the 20G11LF765AN0NNNNN, because its current rating is immediately below 795 A.

The 20G11LF825AN0NNNNN is a useful choice when additional current capacity is required.

The 20G11LF960AN0NNNNN provides a significantly higher current capacity for larger motor applications.

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29. Related Model Comparison

Model	Current	Light Duty	Normal Duty	Heavy Duty	Voltage Class	Cooling	Weight (kg)
20G11LF710AN0NNNNN	710 A	800 kW	710 kW	590 kW	690 VAC	Air	Configuration dependent
20G11LF765AN0NNNNN	765 A	850 kW	750 kW	630 kW	690 VAC	Air	Configuration dependent
20G11LF795AN0NNNNN	795 A	900 kW	800 kW	710 kW	690 VAC	Air	Configuration dependent
20G11LF825AN0NNNNN	825 A	High-power class	High-power class	High-power class	690 VAC class	Air	Configuration dependent
20G11LF960AN0NNNNN	960 A	1000 kW	900 kW	800 kW	690 VAC	Air	Configuration dependent

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30. Five Other Popular Models From the Same Brand

The following models represent different power ranges and product levels.

They are useful for comparison, but they should not automatically be considered direct replacements for the 795 A drive.

Model	Series	Voltage Class	Current Class	Typical Application	Dimensions	Weight (kg)
25B-D010N104	PowerFlex 525	480 VAC class	10 A class	Small pumps and machinery	Compact frame, configuration dependent	Configuration dependent
25B-D017N104	PowerFlex 525	480 VAC class	17 A class	General industrial machinery	Compact frame, configuration dependent	Configuration dependent
25B-D027N114	PowerFlex 525	480 VAC class	27 A class	Pumps, fans and conveyors	Compact frame, configuration dependent	Configuration dependent
20F11ND077AA0NNNNN	PowerFlex 753	480 VAC class	77 A class	Industrial motor control	Frame dependent	Configuration dependent
20G11LF960AN0NNNNN	PowerFlex 755	690 VAC	960 A	Very large industrial motors	800 mm depth class	Configuration dependent

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31. Comparison With Smaller Drives

The difference between the target model and a compact drive is substantial.

Characteristic	Compact Drive	Medium Industrial Drive	20G11LF795AN0NNNNN
Current Capacity	Low	Medium	795 A
Voltage Class	Typically lower	Industrial	690 VAC
Motor Size	Small	Medium	Very Large
Installation	Compact	Industrial	Large industrial
Cooling	Compact	Forced air	Forced air
Frame	Small	Medium	Frame 9
Depth	Small	Medium	Approximately 800 mm
Weight	Low	Medium	Configuration dependent kg
Typical Use	Small machinery	Industrial equipment	Large process machinery
Power Range	Low	Medium	Several-hundred-kilowatt class

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32. Energy Efficiency and Process Control

The primary benefit of a variable frequency drive is not simply changing motor speed.

The drive can help match motor output with process demand.

For centrifugal pumps and fans, this can be especially useful because reducing speed can significantly reduce the power required by the machine.

For example, a ventilation system that does not require maximum airflow can operate the fan at a reduced speed.

Similarly, a pump that does not require maximum flow can operate at a lower speed.

Actual energy savings depend on the complete system.

Important factors include:

• Operating hours
• Load profile
• Motor efficiency
• Pump efficiency
• Fan efficiency
• System pressure
• Flow requirements
• Speed range
• Control strategy

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33. Product Advantages for Large Industrial Equipment

Advantage	Practical Value
795 A Current Capacity	Supports very large motor loads
690 VAC Class	Suitable for high-power motor systems
900 kW LD Class	Suitable for large light-duty applications
800 kW ND Class	Suitable for large normal-duty applications
710 kW HD Class	Suitable for demanding heavy-duty applications
Variable Speed	Flexible process operation
Forced-Air Cooling	Suitable for high-power operation
Frame 9	Large industrial mechanical platform
MCC Style	Suitable for industrial cabinet arrangements
Controlled Starting	Reduces mechanical starting shock
Controlled Stopping	Improves stopping control
Automation Integration	Supports industrial control architectures
High-Power Design	Suitable for major industrial equipment

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34. Recommended Application Matching

Application	Recommended Reason
Large Centrifugal Pump	Variable flow and pressure
Large Cooling Fan	Variable airflow
Large Process Blower	Variable air delivery
Mining Conveyor	High motor current and controlled acceleration
Water Distribution Pump	Process-dependent speed control
Wastewater Aeration Blower	Adjustable airflow
Industrial Exhaust Fan	Variable ventilation
Large Material Handling System	Adjustable speed and starting
Process Plant Pump	Flexible flow control
Large Industrial Machinery	High-current motor control

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35. Selection Notes

When selecting this model, the following information should be checked against the motor and machine:

Selection Item	Required Information
Motor Voltage	Motor nameplate voltage
Motor Current	Full-load current
Motor Power	kW
Motor Frequency	Hz
Motor Speed	rpm
Duty	LD / ND / HD
Overload Requirement	Required overload level
Acceleration	Required acceleration time
Deceleration	Required deceleration time
Load Inertia	Machine inertia
Braking	Required or not required
Ambient Temperature	Installation temperature
Altitude	Installation elevation
Cabinet	Required installation arrangement
Cooling	Airflow requirement
Cable	Motor and input cable sizing
Protection	Input and motor protection
Communication	Required control network
Dimensions	Available installation space
Weight	Structural and lifting requirements

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36. Important Difference Between Catalog Numbers

Models that appear very similar can still have different configurations.

For example:

20G11LF795AN0NNNNN

and

20G11LF795JN0NNNNN

belong to the same general product family and have the same 795 A class, but the complete suffix configuration should not be ignored.

Differences in catalog-number options can affect electrical terminals, input/output arrangement, enclosure-related characteristics, filtering, braking arrangements, disconnect or cabinet configuration, and other features.

Therefore, substitution should be based on the complete catalog number and application requirements.

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37. Product Specification Summary

Parameter	20G11LF795AN0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product Family	PowerFlex 750-Series
Product Type	High-Power AC Variable Frequency Drive
Input Voltage	690 VAC
Input Phase	3 Phase
Current Rating	795 A
Light-Duty Rating	900 kW class
Normal-Duty Rating	800 kW class
Heavy-Duty Rating	710 kW class
Cooling	Air Cooled / Forced Air
Frame	Frame 9
Mechanical Style	MCC Style
Depth	Approximately 800 mm
Width	Configuration dependent
Height	Configuration dependent
Overall Dimensions	Configuration dependent
Weight	Configuration dependent
Weight Unit	kg
Input Type	AC input with precharge
Filtering	Filtered configuration
CM Jumper	Removed
HIM	Blank / No HIM
Output	Variable-frequency three-phase AC
Motor	Three-phase AC motor
Typical Applications	Pumps, fans, blowers, conveyors
Industrial Areas	Water, mining, process, material handling
Installation	Industrial cabinet / electrical room
Braking	Configuration dependent
Communication	Industrial automation integration
Main Advantage	High-power variable-speed motor control

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38. Overall Product Evaluation

The 20G11LF795AN0NNNNN is a large industrial variable frequency drive intended for applications where the motor power and current requirements are far beyond the range of compact machine drives.

Its 795 A rating, 690 VAC class, Frame 9 construction, forced-air cooling, and 800 mm deep MCC-style arrangement make it suitable for substantial industrial installations.

The model is particularly attractive for applications where large motors need to operate at different speeds according to process demand.

For pumps, the drive can provide adjustable flow and pressure control.

For fans and blowers, it can provide adjustable airflow.

For conveyors, it can provide controlled acceleration, adjustable operating speed and controlled stopping.

For water-treatment systems, mining facilities and large process plants, it can serve as the high-power motor-control component between the automation system and the motor.

Its high current capacity also makes it appropriate for applications where large motors operate continuously and where reliable control of motor speed is important.

The main selection consideration is not simply the 795 A number. The motor nameplate current, motor voltage, duty cycle, overload requirement, mechanical load, braking requirement, ambient temperature, installation space, cooling requirements and communication requirements should all be evaluated together.

From the mechanical side, the product belongs to a large-frame category. The approximately 800 mm depth is a useful installation reference, while the final width, height and weight in kg depend on the exact physical configuration.

For purchasing, replacement, engineering design or equipment planning, the complete catalog number 20G11LF795AN0NNNNN should be retained.

Overall, this model is best suited to large pumps, large fans, blowers, conveyors, water-treatment systems, mining equipment, material-handling systems and heavy industrial process machinery where high-current variable-speed AC motor control is required.