Product Overview

The Allen Bradley 20DC085A0ENNANANE is a PowerFlex 700S 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. It is a 400 V three-phase AC drive with Phase II control, an expanded cassette configuration, and a standard incremental encoder interface. It is intended for industrial motor-control systems that require precise speed and torque regulation within a coordinated automation architecture. <Cite refs={[“turn201924search0”]}/>

Unlike a basic variable-frequency drive configuration focused primarily on general-purpose speed adjustment, the PowerFlex 700S Phase II platform supports field-oriented motor control and more advanced drive-control functions. These capabilities make it suitable for machinery where motor response, torque regulation, acceleration, and deceleration need to follow defined operating requirements.

The 20DC085A0ENNANANE configuration includes conformal coating, an EMC filter with a common-mode choke, and an IP20 / NEMA Type 1 enclosure arrangement. It is supplied without a Human Interface Module, internal brake IGBT, drive-mounted brake resistor, or internal communication module. Its Phase II control architecture and expanded cassette distinguish it from other PowerFlex 700S configurations with different control hardware and option combinations.

The standard incremental encoder arrangement provides feedback for compatible motor-control applications. Encoder information can support closed-loop regulation by giving the drive information about motor position or speed. The selected motor, encoder signals, and drive parameters must work together to achieve the intended control response.

For example, a production machine may use the drive to control a motor that must accelerate smoothly, maintain a defined speed, and respond consistently to changing mechanical loads. The drive regulates the motor, while a PLC or other supervisory controller coordinates machine sequences and operating interlocks.

The PowerFlex 700S is part of a broader motor-control architecture rather than a standalone automation controller. Its performance depends on the incoming AC supply, connected motor, encoder configuration, parameter settings, and external control equipment. Selecting the correct catalog configuration is particularly important when replacing an existing drive or integrating it into a machine with established feedback and control requirements.

Technical Specifications

Product Features

• 85 A rated output current: Supports compatible motor applications within the drive’s electrical and thermal operating limits.
• 45 kW normal-duty rating: Provides the specified power capacity for normal-duty operation.
• 37 kW heavy-duty rating: Establishes the applicable power rating for heavier load conditions.
• Phase II control: Supports the advanced drive-control architecture of the PowerFlex 700S family.
• Field-oriented control: Regulates motor operation using the configured control parameters and available feedback.
• Standard incremental encoder interface: Supports compatible encoder-based motor-control arrangements.
• Expanded cassette: Provides the specified hardware configuration for this drive model.
• EMC filter with common-mode choke: Supports electromagnetic compatibility in the intended installation.
• Conformal coating: Adds the specified protective coating to electronic assemblies.
• Integrated control I/O: Provides three analog inputs, two analog outputs, six digital inputs, and two digital outputs.
• No onboard HIM: The supplied configuration does not include a Human Interface Module.
• No internal braking hardware: An internal brake IGBT and drive-mounted brake resistor are not included.
• Industrial enclosure protection: Uses the specified IP20 / NEMA Type 1 enclosure arrangement.

Working Principle

The 20DC085A0ENNANANE regulates an AC motor by controlling the electrical output supplied through its power-conversion section. Its Phase II control architecture supports field-oriented control, allowing the drive to regulate motor operation according to the configured commands and feedback information.

Three-Phase AC Supply → PowerFlex 700S Drive → Controlled Electrical Output → AC Motor → Mechanical Load

The incoming three-phase AC supply provides electrical energy to the drive. Its power-conversion circuitry establishes the DC bus and generates a controlled output for the connected motor. The output voltage and frequency are adjusted according to the selected control method and operating requirements.

Under field-oriented control, the drive manages the motor’s magnetic flux and torque-producing current components. This provides a basis for controlling speed and torque more directly than a simple fixed-frequency supply. The actual response depends on the motor characteristics, drive settings, and feedback configuration.

The standard incremental encoder provides feedback signals for compatible closed-loop applications. These signals help the drive determine motor movement and regulate its response to commanded operating conditions. Encoder wiring, signal compatibility, and parameter settings are therefore important parts of commissioning.

The drive’s analog and digital I/O can connect it to external automation equipment. A PLC may issue operating commands, provide reference signals, and coordinate machine interlocks, while the drive handles motor regulation. The exact function of each terminal depends on the assigned control configuration.

Because this model does not include an internal brake IGBT or drive-mounted brake resistor, applications requiring dynamic braking need a suitable external braking arrangement. The braking design must account for the motor, load inertia, stopping profile, and drive operating limits.

Role in a PowerFlex 700S Motor Control Architecture

The 20DC085A0ENNANANE occupies the motor-regulation position between the three-phase supply and the connected AC motor. It processes operating commands and encoder feedback, while the external controller coordinates the machine sequence and associated equipment.

Three-Phase AC Supply → PowerFlex 700S Drive → AC Motor → Mechanical Transmission → Driven Equipment

Industrial Applications

Installation and Maintenance

1. Confirm the drive reference: Verify that 20DC085A0ENNANANE matches the required PowerFlex 700S control architecture, current rating, and option configuration.
2. Check the incoming supply: Confirm that the installation provides the specified three-phase AC input and meets the drive’s electrical requirements.
3. Isolate the equipment: Follow the applicable lockout/tagout procedure and verify that stored electrical energy has been discharged before servicing the drive.
4. Review the motor rating: Compare the motor nameplate data and operating duty with the 45 kW normal-duty and 37 kW heavy-duty ratings.
5. Inspect the mounting environment: Check enclosure protection, ventilation, ambient conditions, and installation clearances against the drive’s requirements.
6. Verify the encoder arrangement: Confirm that the incremental encoder and its signal connections are compatible with the configured motor-control system.
7. Inspect power connections: Check incoming supply terminals, motor terminals, protective earth connections, and cable condition before energizing the system.
8. Wire the control interface: Verify the analog inputs, analog outputs, digital inputs, digital outputs, and external interlocks against the intended control scheme.
9. Configure the drive parameters: Enter the appropriate motor data, control settings, encoder parameters, and operating limits.
10. Review braking requirements: Establish a suitable external braking arrangement if the application requires dynamic braking, since the supplied configuration lacks an internal brake IGBT and drive-mounted brake resistor.
11. Perform controlled commissioning: Check motor direction, encoder feedback, speed response, acceleration, deceleration, and operating behavior under controlled conditions.
12. Record maintenance results: Document the drive reference, parameter settings, encoder configuration, control wiring, and commissioning findings for future maintenance.

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.
• Uses Phase II field-oriented control for regulated motor operation.
• Supports incremental encoder feedback for compatible closed-loop arrangements.
• Includes analog and digital I/O for integration with external control equipment.
• Incorporates EMC filtering and conformal coating in the specified configuration.

Technical FAQs

What distinguishes the PowerFlex 700S Phase II control architecture from a basic drive configuration?

Phase II control supports advanced drive-control functions, including field-oriented motor regulation. It is intended for applications where motor speed and torque behavior need to be managed according to the configured control strategy.

What role does the incremental encoder play in this drive configuration?

The incremental encoder supplies feedback signals that can be used for compatible closed-loop motor control. Correct encoder wiring, signal compatibility, and parameter configuration are important for accurate drive response.

Does the 20DC085A0ENNANANE include a built-in braking transistor or resistor?

No. This configuration does not include an internal brake IGBT or drive-mounted brake resistor. Applications requiring dynamic braking need an appropriate external braking arrangement.

What should be checked if motor speed feedback is unstable?

Check the encoder supply, feedback wiring, signal integrity, encoder configuration, and relevant drive parameters. Also investigate mechanical coupling and motor-related issues that may affect the relationship between encoder feedback and actual motor operation.