Product Overview

The Allen Bradley 20G11NC085JA0NNNNN is a PowerFlex 755 adjustable-frequency AC drive rated at 85 A, with a normal-duty power rating of 45 kW and a heavy-duty rating of 37 kW. This configuration is intended for 400 V three-phase industrial power systems and combines embedded EtherNet/IP communication, forced-air cooling, an EMC filter, and an internal dynamic braking transistor.

The PowerFlex 755 family supports variable-speed motor control in applications where operating speed, acceleration, torque response, and communication with an automation controller must be coordinated. Rather than supplying a motor directly from a fixed-frequency source, the drive regulates the electrical output according to its configured control mode and operating commands.

A distinguishing feature of the 20G11NC085JA0NNNNN is its AC-input arrangement with DC terminals. This configuration supports the specified power architecture while providing access to the DC terminals for compatible system designs. The drive also incorporates a common-mode filter configuration with the specified jumper arrangement, helping address electromagnetic compatibility within the intended installation.

Embedded EtherNet/IP allows the drive to exchange control and status information with compatible industrial automation equipment. In a Logix-based control system, a controller can coordinate motor operation with sensors, interlocks, process references, and other drives. This reduces the need to treat the motor-control circuit as an isolated part of the machine.

The internal dynamic braking transistor is another relevant selection feature. During deceleration, a motor may return energy to the drive’s DC bus. Where the application and braking design require it, the transistor can control an appropriate external braking resistor arrangement to dissipate that energy. The transistor does not mean that a braking resistor is included in the drive.

The supplied configuration has a blank front panel and does not include a Human Interface Module (HIM). Commissioning and routine operation can therefore be organized through compatible software, network communications, and the installed control architecture.

For example, an industrial conveyor may need to accelerate gradually, maintain a defined transport speed, and stop within a controlled interval. The PowerFlex 755 regulates the motor while a PLC coordinates the conveyor sequence and surrounding equipment. Similar arrangements are possible for compatible pumps, fans, packaging machinery, and material-handling systems.

Technical Specifications

Product Features

• 85 A rated output current: Supports compatible motor applications within the drive’s electrical and thermal limits.
• 45 kW normal-duty rating: Defines the stated power capacity for normal-duty applications.
• 37 kW heavy-duty rating: Provides the corresponding rating for more demanding load conditions.
• Embedded EtherNet/IP: Supports communication with compatible controllers and industrial networks.
• AC input with DC terminals: Provides the specified power connection arrangement for compatible installations.
• Internal dynamic braking transistor: Supports a suitable external braking resistor arrangement when required.
• Forced-air cooling: Uses airflow to manage heat generated during drive operation.
• EMC filtering: Incorporates the specified filter and common-mode jumper configuration.
• Open-type enclosure: Uses the specified IP20/IP00 enclosure arrangement.
• Blank front panel: The supplied configuration does not include a Human Interface Module.
• PowerFlex 755 control platform: Supports adjustable-speed motor operation within the configured control and application limits.

Working Principle

The 20G11NC085JA0NNNNN converts incoming three-phase AC power into a controlled electrical output for an AC motor. The drive regulates output voltage and frequency according to its configured control method, allowing motor speed and acceleration to follow the operating requirements.

Three-Phase AC Supply → PowerFlex 755 Drive → Controlled AC Output → Motor → Mechanical Load

The incoming AC supply feeds the drive’s power-conversion section, which establishes the internal DC bus and generates the output supplied to the motor. By adjusting this output, the drive can control motor speed rather than relying on the fixed frequency of the incoming supply.

Embedded EtherNet/IP provides a communication path between the drive and compatible automation equipment. A PLC can send operating commands and reference values while receiving available drive status information. The controller coordinates the wider machine sequence, while the drive manages the motor according to its parameters and control configuration.

During deceleration, the motor may return energy to the DC bus. When the application requires dynamic braking, the internal braking transistor can switch a compatible external resistor into the braking circuit to dissipate energy. The braking resistor must be selected for the expected energy, stopping frequency, and thermal duty; it is not included merely because the drive contains a braking transistor.

The AC-input configuration also includes DC terminals. Their use must follow the drive’s intended electrical architecture rather than being treated as a general-purpose connection for an arbitrary DC source.

The drive’s operating response depends on motor data, control settings, load inertia, acceleration and deceleration times, and thermal conditions. Correct commissioning establishes these parameters and verifies that the drive behaves as expected throughout the machine’s operating cycle.

Role in a PowerFlex 755 Motor Control Architecture

The 20G11NC085JA0NNNNN occupies the motor-control position between the incoming three-phase supply and the connected motor. It regulates motor operation and communicates with compatible control equipment, while external protective devices and the machine’s control architecture manage the wider installation.

Three-Phase AC Supply → PowerFlex 755 Drive → AC Motor → Mechanical Transmission → Driven Equipment

Industrial Applications

Installation and Maintenance

1. Confirm the drive configuration: Verify that 20G11NC085JA0NNNNN matches the required voltage class, output current, network interface, and braking arrangement.
2. Check the incoming supply: Confirm that the three-phase AC source meets the drive’s specified electrical requirements.
3. Establish electrical isolation: Follow the applicable lockout/tagout procedure and verify that stored electrical energy has been discharged before servicing the drive.
4. Review motor requirements: Compare the motor nameplate data and operating duty with the drive’s 45 kW normal-duty and 37 kW heavy-duty ratings.
5. Inspect the installation environment: Check ventilation, ambient conditions, enclosure requirements, and mounting arrangements against the drive’s installation requirements.
6. Verify branch-circuit protection: Confirm that the protective devices are suitable for the drive and the installed electrical system.
7. Inspect power connections: Check the supply terminals, motor connections, grounding, and cable condition before energizing the equipment.
8. Configure EtherNet/IP communication: Verify the network connection, device configuration, communication settings, and controller integration before enabling normal operation.
9. Set motor parameters: Enter the required motor data and configure the drive’s control mode, speed references, acceleration, and deceleration settings.
10. Review dynamic braking requirements: Determine whether an external braking resistor is required and ensure that its electrical and thermal ratings suit the expected stopping duty.
11. Perform controlled commissioning: Verify motor direction, commanded speed, acceleration, deceleration, network commands, and operating response under controlled conditions.
12. Record maintenance results: Document drive parameters, network configuration, motor data, braking arrangements, and commissioning findings for future troubleshooting.

Related Components

Recommended Related Models

Key Advantages

• Provides 85 A rated output current for compatible motor applications.
• Supports 45 kW normal-duty and 37 kW heavy-duty operation.
• Integrates embedded EtherNet/IP communication.
• Includes an internal dynamic braking transistor for compatible braking arrangements.
• Uses forced-air cooling and the specified EMC filter configuration.
• Supports integration into networked industrial motor-control systems.

Technical FAQs

What is the difference between the 45 kW normal-duty rating and the 37 kW heavy-duty rating?

These ratings define the drive’s specified power capacity for different load-duty conditions. The appropriate rating depends on the motor’s current demand, torque profile, overload requirements, and operating cycle.

Does the 20G11NC085JA0NNNNN include a braking resistor?

No. The configuration includes an internal dynamic braking transistor, but the braking resistor is a separate component when required by the application. Its selection depends on the braking energy, stopping frequency, and thermal duty.

How is the drive integrated into a Logix-based automation system?

The embedded EtherNet/IP interface allows the drive to communicate with compatible controllers. Integration involves configuring the network connection, controller device profile, command and reference data, and the status information used by the machine-control program.

What should be considered when using the drive’s DC terminals?

The DC terminals are part of the specified AC-input drive configuration. Their use must match the intended electrical architecture and applicable drive requirements; they should not be treated as unrestricted terminals for connecting an external DC source.