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Allen-Bradley 20G1F3C1K1LNDNNNNN PowerFlex 755T AC Drive

1. Product Overview

The Allen-Bradley 20G1F3C1K1LNDNNNNN is a high-power PowerFlex 755T AC drive designed for demanding industrial motor-control applications where large motor capacity, stable speed regulation, precise torque control, and reliable system integration are required.

This model belongs to the high-power Frame 9 class and is intended for three-phase industrial power systems using a 400 V AC supply. Its large-frame construction makes it suitable for applications where conventional compact variable-frequency drives are no longer adequate because of motor size, continuous load, or system power requirements.

The 20G1F3C1K1LNDNNNNN is an air-cooled, floor-mounted industrial drive configuration. Its mechanical construction is intended for installation in electrical rooms, drive lineups, industrial control areas, and other dedicated equipment spaces where sufficient ventilation and service clearance can be provided.

The model is particularly appropriate for large motors used in process machinery, material handling, pumping, fans, compressors, conveyors, and other heavy industrial equipment. Its PowerFlex 755T platform provides a scalable control architecture that can be integrated into larger automation systems.

The catalog number contains several configuration identifiers covering the voltage class, frame size, power rating class, enclosure arrangement, and other drive options. Therefore, the exact physical arrangement should always be checked against the nameplate and the ordered configuration when replacing an existing unit or preparing a new installation.

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2. Brand and Series

Item	Specification
Brand	Allen-Bradley
Series	PowerFlex 755T
Product Family	PowerFlex 755T Drive Products
Product Type	High-Power AC Drive
Configuration	Air-Cooled Drive
Installation	Floor Mount / Large Industrial Installation
Model	20G1F3C1K1LNDNNNNN
Voltage Class	400 V AC
Phase	3 Phase
Frame	Frame 9C
Cooling	Forced-Air / Air-Cooled
Application Class	High-Power Industrial Motor Control

The PowerFlex 755T family is positioned for applications requiring significantly greater power capacity than standard compact drive packages. The architecture is intended for large industrial installations where drive performance, motor control, system integration, and serviceability are important design considerations.

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3. Main Technical Parameters

Parameter	Specification
Model	20G1F3C1K1LNDNNNNN
Brand	Allen-Bradley
Series	PowerFlex 755T
Product Type	PowerFlex 755 AC Drive / PowerFlex 755T high-power drive
Voltage Rating	400 V AC
Input Phase	3 Phase
Frequency	50/60 Hz system dependent
Frame Size	Frame 9C
Cooling Method	Air Cooled / Forced Air
Installation Type	Floor Mount
Drive Power Class	Approximately 710 kW class under the applicable 400 V rating structure
Current Rating Class	Approximately 1.1 kA class
Duty Rating	Normal-duty rating class associated with the 1K1 catalog code
Enclosure Configuration	Large industrial floor-mounted configuration
Protection Arrangement	Configuration dependent
Display/HMI	Configuration dependent; verify the complete catalog configuration
Dynamic Braking	Configuration dependent
EMI / Filtering	Configuration dependent
Motor Control	Adjustable-frequency AC motor control
Control Architecture	PowerFlex 755T control platform
Communication	Network and option-module configuration dependent
Feedback	Optional feedback architecture available depending on system configuration
Approx. Height	About 2,453 mm
Approx. Width	About 600 mm for a basic Frame 9 cabinet arrangement; complete system can be wider
Approx. Depth	Approximately 600–800 mm depending on cabinet arrangement
Approx. Weight	Approximately 1,200–1,300 kg for a basic Frame 9 drive cabinet; complete packaged system may be considerably heavier
Mounting	Floor mounted
Application Environment	Industrial electrical room / equipment room
Service Requirement	Adequate front access, ventilation, cable routing and maintenance clearance required

Important rating note: The 1K1 designation identifies a high-power rating class within the PowerFlex 755T catalog structure. The exact current, kW, duty-cycle and thermal ratings can differ according to the specific 755T product architecture and configuration. For engineering replacement work, the rating on the actual nameplate and the complete catalog number should be treated as the controlling information.

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4. Electrical Characteristics

The 20G1F3C1K1LNDNNNNN is designed around a 400 V AC three-phase industrial power system.

Its high-current architecture is intended for large motors and high-power mechanical loads. At this power level, the drive is no longer a small panel-mounted component; it becomes a major part of the plant electrical distribution and motor-control system.

The Frame 9 construction provides the physical space required for high-current power components, cooling equipment, bus structures, control electronics, protection components, and associated installation hardware.

The drive is suitable for variable-speed control of large AC motors where the process requires adjustable speed instead of fixed-speed operation.

Typical control functions can include acceleration and deceleration control, speed regulation, torque control, current limitation, motor protection functions, fault monitoring, and integration with higher-level automation equipment.

The actual motor operating range depends on the motor nameplate, motor control mode, application load profile, drive setup, environmental conditions, and selected operating parameters.

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5. Power Rating and Duty Considerations

The 20G1F3C1K1LNDNNNNN belongs to the high-power 1K1 rating class.

For the 400 V PowerFlex 755T family, the 1K1 class is associated with approximately 710 kW Normal Duty in the applicable rating tables.

At this power level, correct motor selection and duty-cycle analysis are especially important. A motor that operates continuously at a high percentage of rated load can create significantly different thermal requirements from a motor that operates intermittently with long periods of low load.

For applications with high starting torque, repeated acceleration, high inertia, frequent reversing, or sustained overload conditions, the drive should be selected according to the appropriate duty rating rather than simply matching the motor nameplate kW.

The final drive selection should therefore consider:

• Motor rated current.
• Motor rated voltage.
• Motor rated frequency.
• Motor power.
• Continuous operating load.
• Starting torque.
• Acceleration time.
• Deceleration time.
• Load inertia.
• Number of starts per hour.
• Regenerative energy.
• Ambient temperature.
• Installation altitude.
• Cooling conditions.
• Cable length.
• Motor cable construction.
• Harmonic requirements.
• EMC requirements.
• Required network communication.
• Safety requirements.

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6. Mechanical Construction

The Frame 9 architecture is substantially larger than the Frame 5, Frame 6, or Frame 7 configurations commonly encountered in medium-power drive installations.

The large enclosure provides the necessary space for high-current electrical components and thermal management equipment.

A basic Frame 9 installation is approximately 2,453 mm high, with a basic cabinet width around 600 mm and a depth that can be approximately 600–800 mm, depending on the specific cabinet and option arrangement.

The approximate basic drive-cabinet weight is around 1,200–1,300 kg, with approximately 1,246 kg being a useful planning value for a basic Frame 9 drive cabinet.

These values should not be interpreted as guaranteed shipping dimensions for every 20G1F3C1K1LNDNNNNN configuration.

Additional wiring sections, option cabinets, input equipment, output sections, circuit protection, control equipment, cooling arrangements, and other factory-installed options can substantially increase the total system width and weight.

For transportation and installation planning, the complete assembled equipment configuration should therefore be checked rather than relying solely on the basic drive-frame dimensions.

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7. Product Introduction

The 20G1F3C1K1LNDNNNNN is intended for large industrial motor-control systems where accurate variable-speed operation is required at a very high power level.

The drive allows an AC motor to be operated at controlled speed rather than simply being connected directly to a fixed-frequency supply.

This is particularly useful when the production process requires the motor to operate at different speeds according to changing process conditions.

For example, a large pump may need to operate at reduced speed during periods of lower demand. A conveyor may need controlled acceleration to prevent mechanical shock. A fan may need variable-speed control to regulate airflow. A compressor may need controlled speed to match process demand.

In these applications, the drive becomes an important part of the overall control strategy rather than simply serving as an electronic motor starter.

The PowerFlex 755T platform also provides an architecture suitable for integration with industrial control systems, feedback devices, network interfaces, and additional drive options.

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8. Typical Applications

8.1 Large Conveyor Systems

The drive can be used for large conveyor systems in mining, bulk material handling, ports, warehouses, steel plants, cement facilities, and other industrial environments.

Large conveyors often require controlled acceleration because starting a heavily loaded belt can produce substantial mechanical stress.

A high-power variable-frequency drive can provide controlled ramping, allowing the motor to accelerate progressively instead of applying the full starting torque immediately.

Speed control can also be used to match conveyor throughput to upstream and downstream equipment.

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8.2 Pumps

Large industrial pumps are another important application.

Pump systems frequently operate under changing process demand. Running a motor at full speed continuously can result in unnecessary energy consumption when the required flow is lower.

Variable-speed control allows pump speed to be adjusted according to the process requirement.

Typical applications include:

• Water treatment.
• Industrial water circulation.
• Cooling-water systems.
• Process water.
• Mining slurry systems.
• Chemical process pumping.
• Municipal infrastructure.
• Power-generation auxiliary systems.

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8.3 Fans and Blowers

Large fans and blowers can require substantial motor power, especially in industrial ventilation, combustion-air, exhaust, and process-air applications.

The drive can regulate fan speed according to airflow requirements.

This provides greater process flexibility and can reduce mechanical stress associated with fixed-speed starting.

Applications include:

• Industrial ventilation.
• Furnace air systems.
• Exhaust systems.
• Dust collection.
• Combustion air.
• Process cooling.
• Large HVAC installations.

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8.4 Compressors

Large compressors often require careful control of motor acceleration and operating speed.

The 20G1F3C1K1LNDNNNNN can be considered for high-power compressor applications where the motor and process requirements are compatible with variable-frequency operation.

The final application should account for compressor type, minimum operating speed, torque characteristics, acceleration requirements, and process control strategy.

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8.5 Mining Equipment

Mining equipment often operates under severe load conditions and may require high starting torque and continuous operation.

Potential applications include:

• Conveyors.
• Crushers.
• Large fans.
• Pumps.
• Material handling systems.
• Processing equipment.
• Hoisting-related auxiliary machinery.

For mining installations, environmental conditions such as dust, ambient temperature, altitude, enclosure requirements, and cooling airflow must be considered carefully.

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8.6 Cement and Building Material Equipment

Large motors are widely used in cement production and building-material processing.

Typical applications include:

• Kiln auxiliary equipment.
• Large fans.
• Crushers.
• Mills.
• Conveyors.
• Material feeders.
• Dust extraction systems.
• Pumps.

The drive’s large power capability makes it suitable for high-capacity motor applications where controlled speed and acceleration are required.

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8.7 Metals and Steel Processing

Steel and metal-processing machinery can require high motor power together with accurate speed regulation.

Potential applications include:

• Large conveyors.
• Rolling-mill auxiliary systems.
• Cooling systems.
• Process fans.
• Pumps.
• Material handling equipment.
• Large production-line drives.

The exact control requirements depend heavily on the mechanical process and motor configuration.

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9. Product Advantages

9.1 High-Power Capability

One of the primary advantages of the 20G1F3C1K1LNDNNNNN is its ability to address applications in the very high-power range.

The approximately 710 kW class provides a substantial operating range for large industrial motors.

This makes the drive suitable for applications where smaller standard drives would not provide sufficient current capacity.

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9.2 Large-Frame Industrial Construction

The Frame 9 design provides the physical space required for high-current equipment.

Large industrial drives need more than simply a larger semiconductor module. They also require suitable power distribution, cooling, bus structures, control components, and mechanical support.

The Frame 9 construction accommodates these requirements within a dedicated industrial installation.

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9.3 Precise Variable-Speed Control

Variable-frequency control provides an effective method of controlling motor speed according to process requirements.

Instead of operating a motor continuously at one fixed speed, the system can adjust operating speed to suit the production process.

This can be particularly valuable for pumps, fans, conveyors, compressors, and other variable-load machinery.

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9.4 Controlled Acceleration

Large motors and high-inertia mechanical systems can create significant starting forces.

Controlled acceleration allows the motor speed to increase gradually according to a programmed acceleration profile.

This can reduce mechanical shock and help improve the operating behavior of the complete machine.

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9.5 Flexible Industrial Integration

The PowerFlex 755T architecture is designed to work as part of a larger automation system.

Depending on the selected configuration, the system can incorporate network communication, feedback, safety functions, control options, and other accessories.

This makes the drive suitable for applications where the motor controller must exchange operating information with PLCs, HMIs, supervisory systems, or plant-level control networks.

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9.6 Suitable for Complex Process Machinery

The PowerFlex 755T platform is appropriate for machinery where basic start/stop control is not sufficient.

A large process machine may require coordinated speed control, torque management, acceleration profiles, fault monitoring, feedback, and integration with other equipment.

The 755T platform is designed around this type of industrial control requirement.

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9.7 Service and Maintenance Considerations

The large-frame construction provides a more accessible architecture for industrial service than a compact enclosed drive designed for small applications.

For large installations, however, maintenance planning remains critical.

Cooling fans, electrical connections, bus components, control modules, filters, ventilation paths, and other components should be included in a preventive-maintenance program according to the actual operating environment.

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10. Installation Considerations

Because this is a large Frame 9 drive, installation should be planned as an engineering project rather than treated as a simple panel-mount replacement.

The installation area should provide sufficient floor loading capacity for equipment weighing approximately one metric ton or more.

Transport routes must also be checked before delivery.

Door openings, elevator capacity, floor loading, lifting equipment, equipment-room access, and installation clearances should all be evaluated.

Adequate cooling airflow is essential.

A large air-cooled drive generates considerable heat during operation. The electrical room therefore needs an appropriate ventilation or air-conditioning strategy.

The surrounding temperature should remain within the permitted operating range specified for the actual drive configuration.

Cable routing should also be planned before installation.

High-current power cables require appropriate conductor sizing, termination hardware, bending radius, grounding, separation, and protection.

Motor cables should be selected according to the drive installation requirements and the EMC environment.

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11. Maintenance Recommendations

For a high-power Frame 9 drive, preventive maintenance is particularly important.

The cooling system should be kept clean because restricted airflow can increase semiconductor and power-component temperatures.

Cooling fans should be inspected for abnormal noise, vibration, contamination, and deterioration.

Power terminals should be inspected according to the applicable maintenance procedure.

Control wiring should be checked for loose connections, damaged insulation, and signs of overheating.

The electrical enclosure should also be inspected for dust accumulation, moisture, corrosion, and other environmental contamination.

Where the installation is located in a dusty or chemically aggressive environment, maintenance intervals may need to be shorter than those used in a clean electrical room.

The actual maintenance schedule should be established according to operating hours, ambient conditions, load profile, and the manufacturer’s applicable service documentation.

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12. Engineering Selection Points

Before using the 20G1F3C1K1LNDNNNNN as a replacement for another drive, the following parameters should be compared:

Selection Item	Check Required
Model	20G1F3C1K1LNDNNNNN
Supply Voltage	Confirm 400 V AC system
Motor Voltage	Confirm motor nameplate
Motor Current	Must be compatible with selected drive duty
Motor Power	Confirm motor kW
Duty Cycle	Normal, heavy or application-specific duty
Starting Torque	Confirm required starting capability
Load Inertia	Check acceleration/deceleration requirements
Operating Speed	Confirm minimum and maximum motor speed
Motor Frequency	Confirm 50/60 Hz requirements
Regeneration	Determine whether regenerative energy is present
Input Harmonics	Evaluate plant harmonic requirements
EMC Requirements	Confirm installation requirements
Cooling	Confirm air-cooling and room ventilation
Cabinet Size	Verify complete cabinet configuration
Weight	Verify shipping and lifting weight
Communications	Confirm required industrial network
Feedback	Encoder/resolver/other feedback if required
Safety	Confirm required safety architecture
Installation	Verify floor mounting and service clearance

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13. Dimensions and Weight

The following figures should be regarded as engineering planning values, not universal shipping dimensions for every configuration.

Mechanical Parameter	Approximate Value
Model	20G1F3C1K1LNDNNNNN
Frame	Frame 9C
Height	Approximately 2,453 mm
Width	Approximately 600 mm for a basic cabinet
Depth	Approximately 600–800 mm
Basic Cabinet Weight	Approximately 1,246 kg
Complete System Weight	Configuration dependent
Additional Option Bays	May substantially increase overall width and weight
Installation	Floor Mount
Cooling	Air Cooled
Service Access	Front access and equipment-specific clearance required

For a complete packaged system, the actual width may be considerably greater than the basic 600 mm drive cabinet because wiring bays, input equipment, option sections, control sections, and other factory-installed assemblies can be added.

The final shipping weight should therefore be taken from the actual equipment configuration rather than estimated solely from the basic Frame 9 drive section.

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14. Recommended Same-Series or Closely Related Models

The following five models are useful comparison points within the high-power PowerFlex 755T / PowerFlex 755 family. They cover adjacent or closely related power classes and can be useful when selecting an alternative based on motor capacity.

Model	Series / Type	Voltage	Approx. Rating Class	Frame	Cooling	Approx. Dimensions	Approx. Weight
20G1F3C1K0LNDNNNNN	PowerFlex 755T AC Drive	400 V AC, 3 PH	560–630 kW class depending duty	Frame 9	Air Cooled	Approx. 2,453 × 600 × 600–800 mm	Approx. 1,200–1,300 kg
20G1F3C1K1LNDNNNNN	PowerFlex 755T AC Drive	400 V AC, 3 PH	Approx. 710 kW ND class	Frame 9	Air Cooled	Approx. 2,453 × 600 × 600–800 mm	Approx. 1,246 kg basic cabinet
20G1F3C1K2LNDNNNNN	PowerFlex 755T AC Drive	400 V AC, 3 PH	Approx. 800 kW class	Frame 9	Air Cooled	Approx. 2,453 × 600–800 × 600–800 mm	Approx. 1,200–1,400 kg
20G1F3C1K4LNDNNNNN	PowerFlex 755T AC Drive	400 V AC, 3 PH	Approx. 850 kW class	Frame 9	Air Cooled	Approx. 2,453 × 600–800 × 600–800 mm	Approx. 1,200–1,500 kg
20G1F3C920LNDNNNNN	PowerFlex 755T AC Drive	400 V AC, 3 PH	Approx. 560 kW ND class	Frame 9	Air Cooled	Approx. 2,453 × 600–800 × 600–800 mm	Approx. 1,200–1,300 kg

The models above are not identical substitutes. Their current and power classes differ, so the appropriate model should be selected according to motor current, motor power, duty cycle, process load, and installation requirements.

The 20G1F3C1K0LNDNNNNN is useful where the required power is somewhat below the 1K1 class, while the 1K2 and 1K4 configurations provide higher power classes for applications requiring greater motor capacity.

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15. Five Related Allen-Bradley Models for Industrial Applications

The following models are also useful when evaluating a broader Allen-Bradley drive selection. They cover different power levels and voltage classes and can be considered when the application requirements differ from the 400 V Frame 9 configuration.

Model	Series	Voltage	Rating / Current Class	Frame	Cooling	Approx. Dimensions	Approx. Weight
20G1F3C920LNDNNNNN	PowerFlex 755T	400 V AC, 3 PH	Approx. 560 kW ND class	Frame 9	Air Cooled	Approx. 2,453 × 600–800 × 600–800 mm	Approx. 1,200–1,300 kg
20G1F3C1K0LNDNNNNN	PowerFlex 755T	400 V AC, 3 PH	Approx. 630 kW ND class	Frame 9	Air Cooled	Approx. 2,453 × 600–800 × 600–800 mm	Approx. 1,200–1,300 kg
20G1F3C1K2LNDNNNNN	PowerFlex 755T	400 V AC, 3 PH	Approx. 800 kW class	Frame 9	Air Cooled	Approx. 2,453 × 600–800 × 600–800 mm	Approx. 1,200–1,400 kg
20G1D3C540LNANNNNN	PowerFlex 755T / 755 high-power family	480 V AC, 3 PH	540 A class	Frame 8	Air Cooled	Approx. 2,145 × 778 × 425 mm class	Approx. 286 kg class
20G1E4F370MNANNNNN	PowerFlex 755 high-power family	600 V class configuration	370 A class	Large frame	Air Cooled	Configuration dependent	Configuration dependent

The models in this table should be treated as related product references rather than direct drop-in replacements.

Voltage, current, duty rating, enclosure arrangement, cooling method, input configuration, and physical construction must all be checked before selecting a replacement.

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16. Product Positioning

The 20G1F3C1K1LNDNNNNN sits toward the high-power end of the PowerFlex drive product range.

Its most important characteristic is not compact size but its ability to control a very large motor within a dedicated industrial electrical installation.

Compared with smaller Frame 6 or Frame 7 drives, the Frame 9 architecture provides a much larger electrical and mechanical platform.

This makes the model appropriate for installations where motor power, continuous current, mechanical inertia, and process capacity are the dominant selection factors.

It is particularly suitable when the plant requires a large centralized drive installation rather than numerous small distributed drives.

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17. Application Advantages

When properly sized and installed, the 20G1F3C1K1LNDNNNNN can provide several practical benefits to a large industrial system.

First, variable-speed operation allows the motor to follow the process requirement rather than operating continuously at one fixed speed.

Second, controlled acceleration can reduce mechanical stress during startup.

Third, controlled deceleration can improve process handling and reduce abrupt changes in machine speed.

Fourth, the high-current Frame 9 architecture allows one drive system to serve large motors that would otherwise require multiple smaller drive units.

Fifth, the PowerFlex 755T platform provides a foundation for integrating motor control with a larger automation system.

Sixth, the large-frame industrial construction is well suited to dedicated equipment rooms and centralized motor-control installations.

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18. Typical Industries

The 20G1F3C1K1LNDNNNNN can be considered for applications in industries such as:

• Mining.
• Cement manufacturing.
• Steel production.
• Metals processing.
• Water and wastewater treatment.
• Oil and gas support systems.
• Chemical processing.
• Power generation.
• Pulp and paper.
• Bulk material handling.
• Ports and terminals.
• Large-scale manufacturing.
• Industrial ventilation.
• Heavy-duty pumping.
• Large compressor systems.
• Process industries.

The actual suitability depends on the motor, process load, environmental conditions, electrical system, and selected drive configuration.

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19. Why the Model Is Suitable for Large Industrial Systems

A large industrial motor installation needs more than simply sufficient electrical current.

The complete system must manage thermal performance, mechanical acceleration, motor protection, electrical coordination, communications, maintenance, fault handling, and physical installation.

The Frame 9 architecture of the 20G1F3C1K1LNDNNNNN is designed around this type of requirement.

Its large physical structure provides the space necessary for high-current equipment and cooling.

Its PowerFlex 755T control platform provides the control architecture required for complex industrial motor applications.

Its 400 V three-phase configuration fits common industrial power systems in many regions.

For a plant engineer, the model is therefore best viewed as a complete high-power motor-control platform, rather than simply as a conventional small variable-frequency drive.

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20. Summary Specification

Category	Specification
Model	20G1F3C1K1LNDNNNNN
Brand	Allen-Bradley
Series	PowerFlex 755T
Product	High-Power AC Drive
Voltage	400 V AC
Phase	3 Phase
Frame	Frame 9C
Cooling	Air Cooled
Mounting	Floor Mount
Power Class	Approximately 710 kW Normal Duty class
Current Class	Approximately 1.1 kA class
Application	Large industrial AC motor control
Typical Loads	Pumps, fans, compressors, conveyors, process machinery, mining equipment and heavy industrial machinery
Control	Variable-frequency AC motor control
Communications	Configuration dependent
Feedback	Configuration dependent
Safety	Configuration dependent
Dynamic Braking	Configuration dependent
Filtering	Configuration dependent
Approx. Height	2,453 mm
Approx. Width	600 mm basic Frame 9 cabinet
Approx. Depth	600–800 mm
Approx. Weight	About 1,246 kg basic cabinet
Complete System Weight	Configuration dependent
Installation Environment	Dedicated industrial electrical installation

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21. Final Product Description

The Allen-Bradley 20G1F3C1K1LNDNNNNN PowerFlex 755T AC Drive is a large-frame, air-cooled industrial variable-frequency drive designed for high-power three-phase motor applications.

With its 400 V AC three-phase electrical configuration, Frame 9C construction, high-current capability, and approximately 710 kW Normal Duty rating class, it is intended for large motors used in demanding industrial processes.

The drive is especially relevant to applications where precise speed control, controlled acceleration, process flexibility, and integration with industrial automation equipment are required.

Its large Frame 9 construction also makes installation planning an important part of the project. Floor loading, cabinet dimensions, lifting arrangements, cooling airflow, cable routing, maintenance access, and electrical protection should all be considered before installation.

The approximate basic mechanical envelope of 2,453 mm high × 600 mm wide × 600–800 mm deep, together with a basic cabinet weight in the region of 1,246 kg, places this equipment firmly in the large industrial drive category. Actual dimensions and weight can increase substantially when additional option bays, wiring sections, input equipment, protection devices, or other packaged components are included.

For replacement projects, the complete catalog number, nameplate information, motor rated current, motor power, duty cycle, input voltage, enclosure arrangement, and installed options should be checked together.

Overall, the 20G1F3C1K1LNDNNNNN is intended for high-capacity industrial motor-control systems, particularly where a robust large-frame drive is required for pumps, fans, conveyors, compressors, mining equipment, process machinery, and other large rotating equipment.