Allen Bradley PowerFlex 753 AC Drive 20F11ND052AA0NNNNN

The Allen Bradley 20F11ND052AA0NNNNN is a high-performance AC drive from the PowerFlex 753 series. This model delivers reliable motor speed control for demanding industrial applications. It features a wide output frequency range and an internal dynamic braking transistor. The 20F11ND052AA0NNNNN provides versatile control with its embedded I/O and three-phase input design.

Drive Identification & Power Ratings

• Brand: Allen Bradley (Rockwell Automation)
• Model: 20F11ND052AA0NNNNN
• Series: PowerFlex 753 Adjustable Frequency Drive
• Input Power: Three-Phase, 380-480 V AC (+10%/-10%) / 650 V DC
• Input Type: AC Input with DC Bus Precharge Circuit
• Output Power (Normal Duty): 30 kW / 40 HP
• Output Power (Heavy Duty): 22 kW / 30 HP
• Output Current (ND): 52 Amps
• Output Current (HD): 40 Amps
• Output Frequency Range: 0 to 599 Hz
• Control Methods: Volts/Hertz (V/Hz), Sensorless Vector, Closed Loop Vector (with encoder option)

Key Features & Internal Components

• Dynamic Braking: Integrated Internal Brake Transistor
• Common Mode Jumper: Installed (for standard EMC configurations)
• Cooling System: Internal Fan, Air Cooled Design
• Embedded I/O: Includes digital inputs, analog inputs, and relay outputs
• Precharge Circuit: Protects the DC bus capacitors during power-up
• Human Interface Module (HIM): Not included (blanking plate installed)
• Communication: Ready for add-on communication modules (EtherNet/IP, DeviceNet, Profibus)

Physical & Environmental Specifications

• Enclosure Type: Open Type (Chassis) for panel mounting
• Mounting Style: Panel Mount (Frame 4)
• Ingress Protection (IP): IP20 (front)/IP00 (chassis) for indoor cabinet installation
• Operating Temperature: 0°C to 50°C (32°F to 122°F) without derating up to 40°C
• Storage Temperature: -40°C to 85°C (-40°F to 185°F)
• Relative Humidity: 5% to 95% (non-condensing)
• Operating Altitude: 0-1000 meters without derating; derate 1% per 100m above 1000m
• Vibration Resistance: 1.0 G from 2 to 200 Hz per IEC 60068-2-6
• Unit Weight: 22.68 kg (50.00 lbs)

Electrical Performance & Protection

• Overload Capacity: 150% of rated current for 60 seconds (Heavy Duty rating)
• Starting Torque: Up to 180% of motor rated torque in sensorless vector mode
• Speed Regulation: ±0.5% of base speed (sensorless vector, no encoder)
• Carrier Frequency: Adjustable from 2 to 16 kHz (default 4 kHz)
• Efficiency: Typically > 97% at full load
• Protections: Motor overload, overvoltage, undervoltage, ground fault, short circuit, overtemperature, phase loss

Installation & Mounting Requirements

• Mount the drive vertically on a sturdy, metal panel inside a protective electrical enclosure.
• Ensure minimum clearances of 100 mm (4 in) above and below the unit for proper airflow.
• Use only copper conductors for power wiring, sized appropriately for the 52A output current.
• Connect the three-phase AC input power to terminals L1/R, L2/S, L3/T.
• Connect the motor leads to output terminals T1/U, T2/V, T3/W.
• Install a properly rated disconnect switch and branch circuit protection upstream of the drive.
• Ground the drive chassis securely using the provided Protective Earth (PE) terminal.
• For optimal performance, use shielded or twisted-pair cables for control signal wiring.

Packaging & Shipping Details

• Package Contents: 1 x Allen Bradley 20F11ND052AA0NNNNN Drive Unit (Open Chassis)
• Documentation: Quick Installation guide typically included; full manual online.
• Shipping Weight: Approximately 25 kg (55 lbs) with packaging materials.
• Shipping Methods: Available for shipping via FedEx, UPS, or DHL freight services.
• Handling: Lift using the designated handles or from the base of the unit.

Warranty Information

• Coverage Period: 12 months from the original date of purchase.
• The warranty covers failures due to defects in materials or factory workmanship.
• Installation must follow all published electrical and environmental specifications for coverage.
• Support includes guidance on parameter configuration and basic troubleshooting.

Frequently Asked Questions (FAQ)

• What is the purpose of the precharge circuit on the AC input?

The precharge circuit limits the inrush current to the DC bus capacitors when power is first applied. This prevents damage to the capacitors and avoids tripping upstream circuit breakers, extending the drive's service life.

• Can I use this 480V drive on a 400V power supply?

No, the drive is rated for a nominal input of 480V AC. Applying 400V will trigger an undervoltage fault. You must select a PowerFlex 753 model specifically rated for your local supply voltage, such as a 400V version.

• How do I enable the internal dynamic braking transistor?

You must configure the drive's braking parameters in the software (Connected Components Workbench) or on a HIM. You also need to connect an external braking resistor to the designated B1/B2 terminals for the transistor to dissipate the energy.

• What does having the Common Mode Jumper installed mean for my installation?

With the jumper installed, the drive uses its internal EMC filter in the standard configuration. This is suitable for most industrial applications to meet conducted emission limits. You would only remove it for specific grounding schemes or with an external filter.

• Is the 599 Hz output frequency useful for standard motors?

Standard AC motors are typically rated for 50/60 Hz operation. The high-frequency range is for specialized applications like spindle motors, high-speed machining, or testing. Exceeding a motor's rated frequency requires careful consideration of its mechanical and thermal limits.

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