Allen Bradley 20BD248A3ANNANC1 PowerFlex 700 AC Drive

Applications for Large Industrial Motor Systems

The 20BD248A3ANNANC1 is intended for demanding motor-control applications where a conventional fixed-speed motor starter cannot provide the required speed flexibility or process control.

Typical applications include:

• Large conveyor systems
• Material handling equipment
• Industrial pumps
• High-capacity ventilation and cooling fans
• Compressors
• Extrusion equipment
• Paper and converting machinery
• Steel and metal-processing equipment
• Mining and bulk-material systems
• Large production machines
• Industrial process equipment
• Heavy-duty automated machinery

With 248 A of continuous output capacity, the drive can handle substantial motor loads while allowing engineers to configure acceleration, deceleration, current limiting, and stopping behavior according to the machine.

The vector-control architecture also supports applications requiring better speed regulation than basic V/Hz control can provide. When an encoder is used, the drive can provide closed-loop speed and torque control for applications where motor response and speed accuracy are especially important.

Main Features and Practical Benefits

480 VAC three-phase power architecture
The drive is designed around a 480 VAC three-phase industrial supply and provides a 248 A continuous output rating. The corresponding normal-duty rating is 200 HP, while heavy-duty operation is rated at 150 HP.

Vector control with 24V DC I/O
The 20BD248A3ANNANC1 uses vector control with 24V DC I/O. This provides a flexible control platform for machines requiring programmable speed and torque behavior.

Standard encoder feedback
Unlike configurations without feedback, this model includes a standard encoder feedback option. The encoder interface supports incremental dual-channel feedback and can be used when closed-loop speed control is required.

LCD full numeric keypad
The local human-machine interface provides an LCD display and full numeric keypad with programming keys. Operators and maintenance personnel can use it to configure parameters, monitor operating conditions, and investigate drive faults.

Integrated EMC filter
The drive includes EMC filtering with a common-mode choke, helping address conducted electrical noise in industrial motor-control installations.

No internal brake resistor
This configuration does not include an internal braking resistor or brake IGBT. Where rapid stopping or regenerative energy management is required, an appropriately engineered external braking solution may be necessary.

Frame 6 high-power construction
The Frame 6 design is intended for large motor applications and provides the physical and electrical capacity required by high-current industrial equipment.

Programmable acceleration and deceleration
Two independently programmable acceleration and deceleration times can be configured from 0 to 3600 seconds in 0.1-second increments, allowing the drive to accommodate different machine inertia and process requirements.

Multiple stopping methods
The PowerFlex 700 platform supports programmable stopping methods including coast, DC braking, fast braking, RA-to-hold, and S-curve-related stopping functions.

Industrial motor protection
Vector-control configurations provide Class 10 motor overload protection and motor overtemperature protection, helping protect the connected motor during demanding operating conditions.

10 Technical FAQs

1. What is the input voltage of the 20BD248A3ANNANC1?
The drive is designed for a 480 VAC, three-phase, 60 Hz supply. The drive's operating voltage range is within the 380–480 VAC class, with a wider operating range specified by the manufacturer.

2. What is the continuous output current?
The continuous output current is 248 A at 480 VAC under normal-duty conditions. The drive can provide 273 A for one minute and 372 A for three seconds under the specified conditions.

3. What is the horsepower rating of this PowerFlex 700?
The 20BD248A3ANNANC1 is rated at 200 HP for normal-duty operation and 150 HP for heavy-duty operation.

4. Does this model support encoder feedback?
Yes. This particular configuration includes a standard encoder feedback option. It supports incremental dual-channel encoder feedback for applications requiring closed-loop motor control.

5. What encoder supply does the drive provide?
The encoder interface provides a 12 V supply with up to 250 mA capability. The encoder interface supports line-driver type incremental feedback with appropriate voltage and current characteristics.

6. Does the drive contain a built-in braking resistor?
No. The 20BD248A3ANNANC1 has no internal brake resistor and does not include a brake IGBT. External braking equipment must be considered when the application requires significant regenerative braking energy management.

7. What control methods are available?
The PowerFlex 700 platform supports vector control, sensorless vector control with tuning, and V/Hz control with configurable characteristics. The exact operating mode should be selected according to motor characteristics and machine requirements.

8. Can this drive communicate with a PLC or industrial automation system?
Yes. The PowerFlex 700 family can be integrated into industrial control architectures using appropriate communication options and interfaces. This specific catalog configuration does not include an internal communication module, so the installed communication architecture should be checked before integration.

9. What should be checked when replacing this drive?
Engineers should compare the complete catalog number, input voltage, motor current, horsepower, duty rating, control-I/O voltage, encoder requirements, communication options, braking requirements, enclosure requirements, and installed parameters before selecting a replacement.

10. What could cause unstable speed during closed-loop operation?
Possible causes include incorrect encoder wiring, unsuitable encoder characteristics, incorrect motor data, improper feedback polarity, incorrect tuning parameters, mechanical coupling problems, or an unsuitable speed-loop configuration. Encoder feedback should be checked first when speed instability appears only after closed-loop control is enabled.