Product Overview

The Allen Bradley 20LC650A0ENNAN10WA is a PowerFlex 700L liquid-cooled regenerative AC drive rated at 650 A for 400 V three-phase industrial power systems. It has a normal-duty power rating of 370 kW (500 HP) and a heavy-duty rating of 270 kW (365 HP). The drive combines high-power motor regulation with regenerative energy conversion, making it suitable for industrial equipment that requires controlled speed, torque, and deceleration.

The PowerFlex 700L uses a liquid-cooled power structure to manage heat generated by its main power electronics. Coolant circulation transfers heat away from the power section, making the cooling installation an important part of the drive system. Electrical supply design, coolant flow, heat-exchange capacity, and motor operating duty all contribute to overall system performance.

This catalog configuration uses PowerFlex 700 vector control with 24 V DC I/O. It is a complete regenerative drive, allowing energy returned by the motor during suitable operating conditions to be transferred back to the AC supply. This capability is valuable in machinery with frequent deceleration, changing loads, or operating cycles in which the motor alternates between motoring and regenerative operation.

The 20LC650A0ENNAN10WA includes two analog inputs, two analog outputs, six digital inputs, and three digital outputs. These connections allow external control equipment to exchange operating commands and status signals with the drive. The configuration does not include an internal communication module or a Human Interface Module, so its control arrangement is based on the specified I/O and compatible external equipment.

The drive also does not include an internal brake IGBT or a drive-mounted brake resistor. Its regenerative architecture handles energy return through the regenerative power-conversion system rather than relying on a built-in braking resistor as the primary means of managing regenerated energy.

In a large conveyor installation, the motor may need to accelerate a heavy load, maintain a defined transport speed, and decelerate at specific points in the production sequence. The PowerFlex 700L regulates motor operation while a PLC coordinates interlocks, process signals, and adjacent equipment. Similar arrangements can be used in large pumps, industrial processing machinery, and other compatible high-power motor applications.

Technical Specifications

Product Features

• 650 A rated output current: Supports high-power motor applications within the specified operating limits.
• 370 kW normal-duty rating: Provides the stated power capacity for normal-duty operation at the specified supply voltage.
• 270 kW heavy-duty rating: Defines the corresponding power capacity for heavy-duty motor applications.
• Liquid-cooled power section: Transfers heat from the main power electronics through a dedicated coolant circuit.
• Regenerative power conversion: Supports returning regenerated motor energy to the AC supply during suitable operating conditions.
• PowerFlex 700 vector control: Provides motor regulation through the specified control architecture.
• 24 V DC control I/O: Supports integration with external industrial control circuits.
• Integrated analog and digital I/O: Includes two analog inputs, two analog outputs, six digital inputs, and three digital outputs.
• Water cooling: Uses water as the coolant for the specified liquid-cooled configuration.
• IP20 enclosure protection: Supports installation within an appropriately designed industrial electrical enclosure.
• No feedback option: Identifies the supplied feedback configuration for this catalog number.
• No onboard HIM: Uses a blank front plate without an included Human Interface Module.
• Regenerative operation without an internal braking resistor: Uses its regenerative power-conversion architecture to handle suitable energy-return conditions.

Working Principle

The 20LC650A0ENNAN10WA converts incoming three-phase AC power into a controlled electrical output for a connected motor. Its regenerative converter manages power flow between the AC supply and the drive’s internal DC bus, while the inverter section regulates the electrical output supplied to the motor.

Three-Phase AC Supply → Regenerative Converter → DC Bus → Inverter Section → AC Motor → Mechanical Load

During motoring operation, the drive supplies electrical energy to the motor. The PowerFlex 700 vector control system regulates motor operation according to the configured control parameters and operating commands. This allows the motor to respond to changes in speed reference and load conditions.

When the motor decelerates or an overhauling load drives the motor, electrical energy can flow back toward the DC bus. The regenerative converter transfers suitable regenerated energy back to the AC supply. This differs from a conventional non-regenerative arrangement in which braking energy is primarily dissipated through a resistor.

The drive’s liquid-cooling system removes heat from the power electronics. Coolant circulates through the designated cooling passages and transfers heat to the associated heat-removal equipment. Maintaining the required coolant conditions helps the power section operate within its thermal limits.

The 24 V DC I/O provides connections for external commands and status signals. A PLC can coordinate the drive with machine interlocks, operating sequences, and process instrumentation. The drive handles motor regulation, while the controller manages the wider automation process.

The supplied configuration has no feedback option. Its motor-control arrangement should therefore be based on the specified configuration rather than assuming an included encoder-feedback interface. The control method, motor parameters, and operating limits must be configured to suit the intended application.

Role in a PowerFlex 700L Motor Control Architecture

The 20LC650A0ENNAN10WA occupies the high-power motor-control stage in an industrial drive system. It regulates motor operation and supports regenerative energy transfer, while the electrical supply, cooling equipment, protective devices, and external controller support the complete installation.

Three-Phase AC Supply → Protective Devices → Regenerative Converter → DC Bus → Inverter Section → Motor → Driven Equipment

Industrial Applications

Installation and Maintenance

1. Confirm the drive configuration: Verify that 20LC650A0ENNAN10WA matches the required 400 V power system, 650 A output rating, regenerative architecture, and PowerFlex 700 vector control arrangement.
2. Check the incoming supply: Confirm that the three-phase AC source and upstream protective devices meet the drive’s 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 370 kW normal-duty and 270 kW heavy-duty ratings.
5. Inspect the cooling system: Check coolant circulation, water connections, heat-removal equipment, and operating conditions before commissioning.
6. Verify branch-circuit protection: Confirm that the protective devices and electrical connections are suitable for the drive and the installed power system.
7. Inspect power connections: Check the AC input, DC bus connections, motor terminals, grounding, and associated conductors before energizing the equipment.
8. Configure motor parameters: Enter the motor data and establish the required control mode, operating limits, command sources, and acceleration and deceleration settings.
9. Check the control wiring: Verify the 24 V DC control supply, analog signals, digital inputs, and output connections against the intended machine-control arrangement.
10. Review regenerative operation: Confirm that the AC supply and electrical installation support the intended transfer of regenerated energy.
11. Perform controlled commissioning: Verify motor direction, speed response, control I/O, coolant circulation, and regenerative behavior under approved operating conditions.
12. Record maintenance results: Document the drive configuration, motor parameters, cooling-system checks, protective settings, and commissioning findings for future maintenance.

Related Components

Recommended Related Models

Key Advantages

• Provides 650 A rated output current for compatible high-power motor applications.
• Supports 370 kW normal-duty and 270 kW heavy-duty operation.
• Uses liquid cooling to manage heat generated by the power electronics.
• Supports regenerative energy transfer to the AC supply.
• Provides PowerFlex 700 vector control with 24 V DC I/O.
• Includes analog and digital I/O for external control integration.

Technical FAQs

How does the regenerative converter benefit applications with frequent deceleration?

During deceleration, a motor can return energy to the drive’s DC bus. The regenerative converter can transfer suitable energy back to the AC supply, reducing the need to dissipate it through a braking resistor and supporting applications with repeated changes in motor speed.

What does the 650 A rating mean for motor selection?

The 650 A rating defines the drive’s continuous output-current class under its specified operating conditions. Motor selection also depends on the motor’s rated current, duty cycle, load torque, overload requirements, and the drive’s normal-duty or heavy-duty power rating.

Why is coolant management important for the PowerFlex 700L?

The liquid-cooled power section relies on coolant circulation to remove heat generated during operation. Insufficient flow, unsuitable coolant conditions, or reduced heat-exchange capacity can affect thermal performance and may cause the drive to reach its operating limits.

What control arrangement is available when the drive has no feedback option?

This configuration uses PowerFlex 700 vector control without an included feedback option. The control setup should use the supported configuration and appropriate motor parameters, with external automation equipment connected through the available 24 V DC I/O.