Allen Bradley PowerFlex 753 Adjustable Frequency Drive 20F11ND077AA0NNNNN

The Allen Bradley 20F11ND077AA0NNNNN is a versatile AC drive from the PowerFlex 753 series for mid-range motor control. This model balances power and features for demanding industrial applications up to 60 horsepower. It includes embedded I/O for immediate connectivity and an internal dynamic braking transistor. The 20F11ND077AA0NNNNN offers robust performance with built-in EMC filtering and panel-mount design.

Drive Identification & Power Ratings

• Brand: Allen Bradley (Rockwell Automation)
• Model: 20F11ND077AA0NNNNN
• Series: PowerFlex 753 AC Drive
• Input Power: Three-Phase, 380-480 V AC (+10%/-10%) / 650 V DC
• Input Type: AC Input with Precharge Circuit
• Output Power (Normal Duty): 45 kW / 60 HP
• Output Power (Heavy Duty): 37 kW / 50 HP
• Output Current (ND): 77 Amps
• Output Current (HD): 65 Amps
• Output Frequency Range: 0 to 590 Hz
• Control Methods: Volts/Hertz (V/Hz), Sensorless Vector Control

Key Features & Internal Configuration

• Embedded I/O: Installed; includes digital inputs, analog inputs (0-10V/4-20mA), and relay outputs.
• Dynamic Braking: Internal DB (Dynamic Brake) Transistor.
• EMC Filtering: Integrated RFI/EMC Filter for conducted emissions compliance.
• Common Mode Jumper: Installed (standard configuration for typical installations).
• Cooling System: Forced Air Cooling with Internal Fan.
• Precharge Circuit: Standard on AC input models for safe power-up.
• Human Interface Module (HIM): Not included (blanking plate installed).
• Communication Ready: Supports add-on communication adapters (sold separately).
• Frame Size: Frame 5

Physical & Environmental Specifications

• Enclosure Type: Open Type (Chassis)
• Mounting Style: Panel Mount
• Ingress Protection: IP20 (front)/IP00 (chassis)
• 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: 31.75 kg (70.00 lbs)

Electrical Performance & Protection

• Overload Capacity: 150% of rated current for 60 seconds (Heavy Duty rating).
• Starting Torque: Up to 200% of motor rated torque in sensorless vector mode.
• Speed Regulation: ±0.5% of base speed (sensorless vector).
• Carrier Frequency: Adjustable from 2 to 16 kHz (default setting typically 4 kHz).
• Efficiency: Typically > 97% at full load.
• Protections: Motor overload, overcurrent, overvoltage, undervoltage, ground fault, short circuit, heat sink overtemperature, phase loss.

Installation & Mounting Guidelines

• Mount the drive vertically on a solid metal panel within an electrical enclosure.
• Maintain minimum clearances of 100 mm (4 in) above and below the unit for airflow.
• Use appropriately sized copper conductors for the 77A output current.
• Connect three-phase AC 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 fuses or circuit breaker upstream.
• Ground the drive chassis securely using the provided Protective Earth (PE) terminal.
• For control wiring, use shielded cables and ground the shield at the drive end only for EMC.

Packaging & Shipping Details

• Package Contents: 1 x Allen Bradley 20F11ND077AA0NNNNN Drive Unit (Open Chassis)
• Documentation: Quick Start guide included; full manual available online.
• Shipping Weight: Approximately 35 kg (77 lbs) with packaging.
• Shipping Methods: Available via FedEx, UPS, or DHL freight services.
• Handling: Use proper lifting technique or equipment due to the unit's weight.

Warranty Information

• Coverage Period: 12 months from the date of purchase.
• The warranty covers defects in materials and factory workmanship under normal operating conditions.
• Installation must adhere to all published electrical and environmental specifications.
• Support is available for parameter configuration and initial startup procedures.

Frequently Asked Questions (FAQ)

• What is the advantage of having the embedded I/O installed?

It provides immediate access to basic control functions without needing an extra module. You can connect start/stop buttons, speed potentiometers, and run-status relays directly, allowing for quick commissioning and standalone operation.

• How do I use the internal dynamic brake transistor?

You must connect an external braking resistor to the drive's B1/B2 terminals. Then, enable and configure the braking function in the drive parameters (deceleration time, brake voltage level) to control motor stopping energy dissipation.

• Can I connect a 480V drive to a 400V supply for testing?

No, the drive will fault on undervoltage. The input voltage must be within the drive's specified range (380-480V AC for this model). For a 400V supply, you should select a PowerFlex 753 drive specifically rated for 400V nominal input.

• What does the Common Mode Jumper do, and should I ever remove it?

The jumper completes the internal EMC filter circuit. Keep it installed for standard use to meet emission standards. You would only remove it if instructed by a detailed EMC plan or when using an external filter, to prevent ground loops.

• Is the IP20 rating sufficient for a dusty environment?

IP20 protects against fingers and solid objects larger than 12.5mm, but not against dust. For dusty environments, the drive must be installed inside a sealed control cabinet that provides the appropriate IP rating (like IP54) for the entire panel.

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