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Allen-Bradley 20G11BD2K0AN0NNNNN — PowerFlex 755 High-Power AC Drive

1. Product Overview

The 20G11BD2K0AN0NNNNN is a high-power PowerFlex 755 AC drive designed for large industrial motor-control applications.

It belongs to the PowerFlex 750-Series, with the specific product series being PowerFlex 755. This model is intended for large three-phase AC motors used in heavy industrial equipment, large pumps, fans, blowers, conveyors, mining systems, cement plants, metals processing, water infrastructure and other applications requiring very high motor current.

The drive is rated for a 480 VAC, three-phase electrical supply and has a rated current of approximately 2,070 A. Its published ratings are approximately 2,000 HP Light Duty, 1,750 HP Normal Duty and 1,650 HP Heavy Duty.

This makes the model a megawatt-class industrial drive, rather than a conventional compact machine inverter.

The model uses Frame 10 construction and is associated with a 600 mm-deep MCC-style package. The specified configuration includes air cooling, EMC filtering, AC input with DC terminals, no dynamic braking and no local HIM.

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2. Brand and Product Series

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3. Main Technical Parameters

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4. Product Classification

The 20G11BD2K0AN0NNNNN is positioned at the very high end of the PowerFlex 755 power range.

Its approximately 2,070 A current rating is the most important characteristic when evaluating the model.

This current capacity allows the drive to control extremely large AC motors that would be far beyond the normal range of compact and medium-size variable-frequency drives.

The drive is particularly appropriate when the motor system requires:

• Very high continuous current
• Large starting torque
• Controlled acceleration
• Controlled deceleration
• Variable operating speed
• Process speed regulation
• Integration with industrial automation
• Heavy-duty continuous operation

For a large industrial facility, this type of drive is normally treated as a major electrical system rather than simply another control component.

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5. 480 VAC Three-Phase Input

The drive is designed for 480 VAC three-phase power.

480 VAC is widely used in industrial electrical systems, particularly in North American industrial plants and large manufacturing facilities.

The 480 VAC supply is converted and controlled by the drive’s power section before being delivered to the motor.

Because the drive operates at approximately 2,070 A, the incoming electrical system must be engineered for very high current.

Important considerations include:

• Incoming switchgear
• Disconnect equipment
• Short-circuit protection
• Busbar sizing
• Cable sizing
• Grounding
• EMC control
• Thermal management
• Ventilation
• Electrical clearances
• Maintenance access
• Floor loading
• Transportation and lifting

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6. 2,070 A Current Rating

The approximately 2,070 A rating makes the 20G11BD2K0AN0NNNNN a very large industrial drive.

At this current level, the drive is intended for motors and machinery that consume substantial electrical power.

The high current capacity is useful for applications such as:

• Large mining conveyors
• Large centrifugal pumps
• Large process fans
• Large blowers
• Heavy material-handling equipment
• Cement-process machinery
• Steel-process equipment
• Industrial water systems
• Large production machinery

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7. Horsepower Ratings

The model has three primary duty ratings.

The horsepower values represent different application duty conditions.

The actual motor selection should be based primarily on the motor’s rated current and the application load profile.

Horsepower is useful for comparison, but current, overload requirements, acceleration requirements and duty cycle are more important when selecting a large industrial drive.

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8. Light-Duty Operation

The 2,000 HP Light Duty rating is the highest horsepower rating listed for this model.

Light Duty is generally appropriate for applications where the motor load is relatively stable and the overload requirement is not particularly demanding.

Typical examples can include large:

• Centrifugal fans
• Centrifugal pumps
• Blowers
• Process ventilation equipment

The main objective is usually continuous speed regulation rather than severe torque overload.

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9. Normal-Duty Operation

The 1,750 HP Normal Duty rating provides a substantial amount of available power for general industrial applications.

This rating can be relevant to:

• Large pumps
• Large fans
• Large conveyors
• Industrial blowers
• Material-handling systems
• Process machinery

Normal Duty provides a useful balance between motor power and operating margin for many industrial applications.

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10. Heavy-Duty Operation

The 1,650 HP Heavy Duty rating is particularly important for demanding mechanical systems.

Heavy-duty applications can involve:

• High starting torque
• High inertia
• Frequent acceleration
• Frequent deceleration
• Variable mechanical loading
• Heavy material loads
• Difficult starting conditions

Mining conveyors and large material-handling systems are examples where Heavy Duty selection may become particularly important.

The lower horsepower rating under Heavy Duty operation provides additional operating capability for demanding load conditions.

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11. Power Conversion

The horsepower ratings can be converted approximately using:

1 HP ≈ 0.746 kW

These are approximate mechanical-power equivalents.

Actual electrical input power will depend on motor efficiency, drive efficiency, power factor, operating speed and load.

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12. Product Introduction

The PowerFlex 755 series is designed for industrial applications where motor control, process flexibility and system integration are important.

A conventional motor starter generally provides basic starting and stopping.

A variable-frequency drive provides substantially more control.

The motor can operate at different speeds according to process requirements.

Acceleration can be controlled.

Deceleration can be controlled.

Motor operating conditions can be monitored.

The drive can also exchange information with a plant automation system.

For a megawatt-class motor, these capabilities can have a major impact on equipment operation and process stability.

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13. Basic Operating Principle

The general operating process can be understood as:

480 VAC Three-Phase Input

↓

PowerFlex 755 Drive

↓

Variable-Frequency / Variable-Voltage Motor Output

↓

Large AC Motor

↓

Mechanical Equipment

↓

Industrial Process

The drive controls the electrical energy delivered to the motor.

By changing the output frequency and voltage according to the selected motor-control strategy, the drive can regulate motor speed and torque.

This allows the motor to respond to changing process requirements instead of operating continuously at one fixed speed.

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14. Variable-Speed Control

Variable-speed operation is one of the major reasons to select a PowerFlex 755 drive.

A motor does not necessarily need to run at full speed all the time.

For example, a large pump may only need 70% of its maximum flow.

A large fan may only require 60% airflow.

A conveyor may need to operate at different production speeds.

A process blower may need to respond to pressure changes.

Instead of running the motor at full speed continuously, the drive can adjust motor speed to match the process requirement.

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15. Controlled Acceleration

Starting very large motors can produce significant mechanical and electrical stress.

A large motor can be connected to:

• Heavy shafts
• Gearboxes
• Large pump impellers
• Large fan blades
• Long conveyor belts
• Heavy material loads
• High-inertia rotating assemblies

The drive allows the motor to accelerate according to a defined acceleration profile.

This can reduce sudden mechanical shock and make the startup process more predictable.

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16. Controlled Deceleration

Stopping large rotating equipment can also be challenging.

Large rotating machinery stores substantial kinetic energy.

If the equipment is stopped too quickly, mechanical stress can increase.

Controlled deceleration provides a more gradual reduction in speed.

This is useful for:

• Conveyors
• Large fans
• Blowers
• Pumps
• Mining machinery
• Material-handling systems
• High-inertia machinery

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17. Torque Control

Torque control becomes particularly important for large industrial machinery.

A conveyor loaded with material may require high torque during acceleration.

A mining machine may encounter sudden changes in mechanical resistance.

A large pump may have significant starting requirements.

The drive can manage motor torque according to the selected control strategy and application requirements.

This allows the electrical system and mechanical system to work together more smoothly.

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18. Process Speed Control

The drive can be integrated into a process-control strategy where motor speed follows an external reference.

For example:

Process Demand

↓

PLC / Control System

↓

Speed Reference

↓

PowerFlex 755

↓

Motor

↓

Process Equipment

This arrangement is useful for automated pumping, ventilation, conveying and material-handling systems.

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19. Industrial Automation Integration

Large PowerFlex installations are frequently integrated with plant automation.

A typical system may include:

• PLC
• HMI
• Distributed control system
• Industrial Ethernet
• Remote I/O
• Process instrumentation
• Supervisory monitoring

The drive can provide information such as:

• Motor speed
• Output current
• Drive status
• Fault status
• Alarm status
• Operating frequency
• Load condition
• Control state

This information can help operators and maintenance personnel understand the operating condition of the motor system.

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20. Mining Applications

Mining is one of the strongest application areas for a drive of this size.

Large mining operations use high-power motors for:

• Long conveyors
• Ore transport
• Mine ventilation
• Dewatering
• Material handling
• Processing equipment
• Crushing-related equipment

The mechanical loads in mining are often severe.

Equipment may need to start with material already loaded.

This makes controlled acceleration and high torque capability particularly valuable.

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21. Mining Conveyor Applications

A large mining conveyor can contain a substantial amount of mechanical inertia.

The system may include:

• Motor
• Gearbox
• Drive pulley
• Rollers
• Conveyor belt
• Loaded material

All of these components influence starting requirements.

A high-power variable-frequency drive can gradually increase motor speed rather than applying full speed immediately.

This can help reduce:

• Belt shock
• Gearbox stress
• Coupling stress
• Mechanical vibration
• Sudden torque changes

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22. Cement Industry Applications

Cement plants contain numerous high-power motor systems.

The 20G11BD2K0AN0NNNNN can be considered for applications such as:

• Large process fans
• Large blowers
• Material conveyors
• Large pumps
• Ventilation equipment
• Material-handling systems
• Process equipment

Fans and blowers can benefit from variable-speed control because process airflow requirements can change during production.

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23. Steel and Metals Applications

Steel and metals processing plants often use large motors for continuous processes.

Potential applications include:

• Cooling pumps
• Process fans
• Blowers
• Conveyors
• Material handling
• Water circulation
• Ventilation
• Large auxiliary machinery

In these environments, reliability and predictable motor operation are particularly important.

A variable-frequency drive can provide more control than a simple fixed-speed motor starter.

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24. Water and Wastewater Applications

Large water-transfer and wastewater facilities can use very large pumping motors.

Potential applications include:

• Raw-water pumping
• Water-transfer stations
• Industrial cooling water
• Large wastewater pumps
• Flood-control pumping
• Process-water systems
• Municipal-scale pumping

Variable-speed operation can help match pump output to changing system demand.

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25. Large Pump Applications

Large centrifugal pumps are often excellent candidates for variable-speed drives.

Instead of continuously operating the motor at full speed, the drive can adjust speed according to the required flow or pressure.

Potential benefits include:

• Better flow control
• Better pressure regulation
• Reduced throttling
• Lower mechanical stress
• Reduced starting shock
• Potential energy savings
• Better process flexibility

The actual energy savings depend on pump characteristics and the operating profile of the installation.

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26. Large Fan Applications

Industrial fans can operate continuously for many hours.

If full airflow is not always required, reducing motor speed can be an efficient way to regulate airflow.

Typical applications include:

• Mine ventilation
• Cement-process fans
• Industrial exhaust
• Dust-control systems
• Steel-process ventilation
• Cooling systems
• Combustion-air systems

The drive allows fan speed to follow actual process demand.

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27. Blower Applications

Large industrial blowers are used in many process applications.

Examples include:

• Aeration
• Combustion air
• Pneumatic material transport
• Industrial ventilation
• Process air
• Dust collection

Variable-speed operation allows the blower to respond to changing pressure and flow requirements.

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28. Material-Handling Applications

Large material-handling systems can contain substantial mechanical inertia.

The drive can provide controlled motor speed and acceleration.

Potential applications include:

• Bulk-material conveyors
• Mining material transfer
• Port material handling
• Industrial transfer systems
• Cement material handling
• Large production conveyors

Controlled acceleration can be particularly useful when the conveyor is loaded.

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29. Main Product Advantages

29.1 Very High Current Capacity

The approximately 2,070 A current rating is the primary advantage.

It allows the drive to operate large motors that are beyond the capacity of standard compact drives.

29.2 Megawatt-Class Motor Capability

The 2,000 HP Light Duty rating places the drive in the megawatt-class motor-control category.

29.3 Variable-Speed Operation

Motor speed can be adjusted according to actual process requirements.

29.4 Controlled Acceleration

Large machines can start gradually, helping reduce mechanical shock.

29.5 Controlled Deceleration

Large rotating equipment can be stopped according to a defined speed profile.

29.6 Industrial Automation Integration

The PowerFlex 755 platform is suitable for integration into sophisticated plant automation systems.

29.7 Air-Cooled Construction

The air-cooled configuration eliminates the need for a dedicated liquid-cooling circuit.

29.8 Large Industrial Package

Frame 10 construction is suitable for large electrical-room and MCC-style installations.

29.9 Heavy-Industry Suitability

The drive is well suited to mining, cement, metals, water, material handling and other demanding industrial environments.

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30. EMC Filter

The specified model configuration includes an EMC filter.

EMC considerations become important in large drive installations.

The filter should be considered together with:

• Grounding
• Cable shielding
• Motor cable routing
• Control cable routing
• Cabinet bonding
• Electrical separation
• Communication cable routing

A properly designed installation is necessary to achieve good electromagnetic performance.

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31. Dynamic Braking

The catalog configuration is specified as having no dynamic braking.

This is an important point when evaluating applications involving high-inertia loads.

If rapid stopping is required, the complete braking strategy should be evaluated.

Possible considerations include:

• Deceleration time
• Load inertia
• Regenerative energy
• Mechanical brake
• External braking equipment
• Process stopping requirements

The absence of integrated dynamic braking does not prevent the drive from being used in demanding applications, but the stopping strategy must be designed appropriately.

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32. Local HIM

The specified configuration is Blank / No HIM.

This means the catalog configuration does not include a local Human Interface Module.

This can be appropriate for large centralized industrial installations where operators interact with the drive through:

• Plant HMI
• Control room
• PLC
• Supervisory system
• Industrial network

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33. Mechanical Construction

The drive uses Frame 10 construction.

It is associated with a 600 mm-deep MCC-style package.

This is considerably different from a small wall-mounted inverter.

The installation therefore requires planning for:

• Floor space
• Electrical-room layout
• Cable routing
• Service clearance
• Ventilation
• Maintenance access
• Transportation
• Lifting
• Floor loading

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34. Dimensions

The confirmed package depth for this configuration is approximately 600 mm.

The exact overall height and width can depend on the final packaged configuration.

Therefore, an exact H × W × D figure should not be invented without the final mechanical drawing.

For actual installation, the final mechanical drawing should be used to determine the complete dimensional envelope.

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35. Weight

The 20G11BD2K0AN0NNNNN is a very large industrial drive.

Because of its Frame 10 construction and approximately 2,070 A current capacity, the complete packaged assembly should be considered heavy industrial equipment.

For preliminary planning purposes, the equipment can be treated as approximately 1,000 kg class.

The exact net weight and shipping weight can vary according to the final configuration and packaging.

The 1,000 kg-class value should be regarded as a preliminary planning figure, not a certified lifting or shipping weight.

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36. Cooling and Thermal Management

The drive is air cooled.

At a current rating of approximately 2,070 A, the power electronics can generate substantial heat.

Adequate airflow is therefore essential.

The electrical installation should provide sufficient ventilation and heat removal.

Regular maintenance should include inspection of:

• Cooling fans
• Air passages
• Intake areas
• Exhaust areas
• Dust accumulation
• Cabinet ventilation
• Ambient temperature
• Internal temperature

Poor airflow can increase thermal stress and reduce the operating margin of power electronics.

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37. Electrical Installation

A 2,070 A drive requires careful electrical engineering.

At this current level, connection quality is extremely important.

Busbars, terminals, cables and mechanical connections must be correctly sized and installed.

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38. Energy-Saving Potential

Variable-speed control can provide energy-saving opportunities in suitable applications.

This is particularly relevant to centrifugal pumps and fans.

When the process demand decreases, motor speed can be reduced.

For example, a large fan operating at a lower required airflow does not necessarily need to run continuously at full speed.

Likewise, a pump operating at reduced flow may be able to operate at a lower speed.

Potential benefits include:

• Lower energy consumption
• Reduced throttling
• Improved process control
• Reduced mechanical stress
• Better operating flexibility

Actual energy savings must be calculated from the specific machine and operating conditions.

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39. Maintenance Considerations

A drive of this size should be included in a planned maintenance program.

For an air-cooled high-power drive, maintaining clean cooling passages is especially important.

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40. Five Recommended Models from the Same Series

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

These models create a useful progression from 800 A through 2,070 A.

The 20G11BD1K5AN0NNNNN is particularly useful as a lower-current comparison.

The 20G11BD2K0AN0NNNNN provides a significant increase in current and horsepower capability.

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41. Same-Series Detailed Comparison

The weight figures shown here are preliminary planning-level values.

Actual equipment weight can vary according to the final package and configuration.

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42. Five Same-Brand Popular / Related Models

For comparison with other products under the same brand, the following models represent different power ranges and application levels.

These models are not direct replacements for one another.

The PowerFlex 525 and 527 are intended for considerably smaller equipment.

The PowerFlex 753 is positioned for industrial applications at a lower power level.

The PowerFlex 755 includes much larger configurations, including the 20G11BD2K0AN0NNNNN.

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43. Same-Brand Comparison

The smaller models can be excellent choices for smaller machinery.

They should not, however, be considered substitutes for a 2,070 A application.

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44. Application Suitability

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45. Recommended Duty by Application

The final duty selection should be based on the actual motor current, mechanical load and operating cycle.

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46. Replacement Consideration

The 20G11BD2K0AN0NNNNN is a discontinued configuration.

The listed direct replacement is:

20G11BD2K0JN0NNNNN

When replacing an existing unit, the complete catalog number should be checked carefully.

It is not sufficient to compare only the PowerFlex series and horsepower.

The replacement evaluation should include:

• Input voltage
• Current rating
• Duty rating
• Motor horsepower
• Frame
• Cabinet dimensions
• Weight
• Cooling
• EMC configuration
• Braking requirements
• Communication
• Motor feedback
• Control architecture
• Existing parameters

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47. Why the Complete Model Number Matters

The complete catalog number identifies the specific configuration.

Models that look very similar can have differences in:

• Filtering
• Common-mode configuration
• Dynamic braking
• HIM configuration
• Input arrangement
• Packaging
• Other factory options

Therefore, 20G11BD2K0AN0NNNNN should always be treated as a complete product identifier.

When ordering spare parts or replacements, the complete catalog number should be recorded exactly as shown on the product nameplate.

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48. Procurement Specification Table

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49. Installation Space

A drive of this size requires significantly more planning than a compact VFD.

The installation area should provide enough space for:

• Equipment footprint
• Incoming power connections
• Motor connections
• Control wiring
• Cooling airflow
• Maintenance access
• Inspection
• Door or panel movement
• Cable routing
• Lifting equipment
• Future replacement

The 600 mm package depth should therefore not be interpreted as the total required installation depth.

Additional clearance is required around the equipment.

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50. Weight and Handling

The approximate 1,000 kg-class weight has implications for installation.

The site should consider:

• Delivery route
• Door dimensions
• Floor strength
• Forklift capacity
• Crane capacity
• Lifting points
• Transportation equipment
• Final installation position
• Maintenance replacement strategy

Moving a megawatt-class packaged drive should be treated as a heavy-equipment operation.

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51. Thermal Management

Large electrical drives produce heat during operation.

The heat generated depends on:

• Motor current
• Switching frequency
• Ambient temperature
• Load level
• Drive efficiency
• Operating conditions

For this reason, the electrical room should be designed with adequate ventilation and heat removal.

The cooling system should also be maintained throughout the operating life of the equipment.

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52. Environmental Considerations

Before installing the drive, the operating environment should be evaluated.

Important factors include:

• Ambient temperature
• Dust
• Humidity
• Corrosive gases
• Altitude
• Ventilation
• Vibration
• Water exposure
• Contamination

Mining and cement environments may contain substantial dust.

Steel plants may have heat and airborne contaminants.

Water-treatment environments may have humidity and corrosive conditions.

The drive enclosure and installation environment should therefore be matched to the actual site conditions.

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53. Why the Model Is Suitable for Large Pumps

A large pump installation may need to operate at different flow rates throughout the day.

Running a motor continuously at full speed can create unnecessary energy consumption when process demand is low.

With variable-speed control, the motor speed can be adjusted.

This can provide:

• Better flow control
• Better pressure regulation
• Reduced throttling
• Lower mechanical stress
• Potentially lower energy consumption

For very large pumps, these benefits can have a substantial effect on overall plant operating costs.

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54. Why the Model Is Suitable for Large Fans

Large industrial fans often operate continuously.

Process requirements can change depending on:

• Production rate
• Temperature
• Pressure
• Ventilation requirements
• Air quality
• Process conditions

Variable-speed operation allows fan performance to follow demand.

This can be particularly useful in cement plants, mining operations, steel plants and industrial ventilation systems.

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55. Why the Model Is Suitable for Conveyors

Conveyor systems can experience severe mechanical stress during starting.

The problem becomes more significant as the conveyor becomes longer and heavier.

A conveyor may contain:

• Long belts
• Multiple rollers
• Large drive pulleys
• Gearboxes
• Heavy material
• High mechanical inertia

Controlled acceleration can help distribute the starting torque more smoothly.

This is one of the most important reasons high-power drives are used on large conveyors.

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56. Why the Model Is Suitable for Mining

Mining equipment often operates under demanding conditions.

The machinery can experience:

• High mechanical loads
• Long operating hours
• Dust
• Temperature variation
• Heavy starting conditions
• Continuous production requirements

A high-power industrial drive can provide controlled motor operation while integrating with the plant automation system.

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57. Why the Model Is Suitable for Cement

Cement production requires many large motors.

Fans, blowers, conveyors and pumps can operate continuously.

Variable-speed control can provide better control over process conditions.

The high current capability of the 20G11BD2K0AN0NNNNN makes it suitable for the largest motor systems in a cement plant, assuming the actual motor current and duty requirements match the drive.

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58. Why the Model Is Suitable for Steel

Steel plants typically place strong demands on electrical equipment.

Large motors may operate for long periods and can be connected to important production processes.

The drive can be considered for:

• Cooling pumps
• Process fans
• Blowers
• Conveyors
• Material handling
• Utility systems

Its high current rating provides the capacity required by very large motors.

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59. Product Selection Checklist

Before selecting the 20G11BD2K0AN0NNNNN, the following information should be confirmed.

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60. Five Recommended Same-Series Models — Quick Selection

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61. Five Same-Brand Models — Quick Selection

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62. Overall Advantages

The 20G11BD2K0AN0NNNNN has several characteristics that make it particularly suitable for large industrial installations.

The first is its 2,070 A current rating.

The second is its 2,000 HP Light Duty rating, which places it firmly in the megawatt-class motor-control category.

The third is its Frame 10 air-cooled construction, which is designed for large industrial electrical installations.

The fourth is the ability to provide variable-speed motor control rather than simple fixed-speed operation.

The fifth is its suitability for integration with a larger industrial automation system.

The sixth is its broad application range.

The same general drive platform can be used for pumps, fans, blowers, conveyors and other large motor-driven equipment.

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63. Overall Technical Assessment

The 20G11BD2K0AN0NNNNN is best understood as a very-high-power industrial variable-frequency drive for megawatt-class AC motors.

It is not intended for small machines.

It is not intended for ordinary light-duty factory equipment.

It is intended for applications where the motor itself can be hundreds of kilowatts or more than one megawatt in size.

Its approximately 2,070 A current rating, 2,000 HP Light Duty rating, 1,750 HP Normal Duty rating and 1,650 HP Heavy Duty rating provide a large operating range.

The 480 VAC three-phase input makes it suitable for large industrial power systems.

The Frame 10 / 600 mm-deep MCC-style construction is appropriate for centralized industrial electrical installations.

The air-cooled design simplifies the cooling architecture compared with a liquid-cooled system, although substantial ventilation and thermal management are still required.

The model is particularly strong for large pumps, large fans, blowers, mining conveyors, cement equipment, steel-process equipment, water infrastructure and heavy material-handling systems.

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64. Final Technical Summary

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65. Final Conclusion

The Allen-Bradley 20G11BD2K0AN0NNNNN is a high-capacity PowerFlex 755 AC drive designed for very large industrial motor applications.

Its approximately 2,070 A current capacity and 2,000 HP Light Duty / 1,750 HP Normal Duty / 1,650 HP Heavy Duty ratings place it among the largest air-cooled configurations in this product family.

The model is particularly suitable where a plant needs reliable variable-speed control for very large motors.

For pumps, it can provide adjustable flow and pressure control.

For fans and blowers, it can provide adjustable airflow.

For conveyors, it can provide controlled acceleration and deceleration.

For mining equipment, it can provide high-power motor control for demanding mechanical loads.

For cement and steel plants, it can provide variable-speed control for large process equipment.

For water infrastructure, it can provide controlled operation of very large pumping systems.

The combination of high current capacity, megawatt-class horsepower capability, air-cooled construction, industrial automation capability and large-scale MCC-style packaging makes the 20G11BD2K0AN0NNNNN a strong choice for heavy industrial motor-control applications where conventional low-power drives are not sufficient.

For engineering, procurement and replacement work, the most important information to retain is the complete catalog number, the 2,070 A current rating, the applicable LD/ND/HD duty rating, the 480 VAC three-phase input, the Frame 10 construction, the 600 mm package depth, and the actual configured dimensions and weight before final installation planning.