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Product Description
The Allen-Bradley 20DD077A3NNNA2NBB PowerFlex 700S AC drive, operating at 480V AC with a 77-amp normal-duty rating for three-phase systems, features an IP20/NEMA Type 1 enclosure, a numeric LCD display, and adjustable bus undervoltage trip. While lacking braking capabilities and readily available documentation, it offers logic control ride-thru for 0.25 seconds and power ride-thru for 15 milliseconds under full load, along with microprocessor-monitored heat sink protection.
Is Your Device Showing These Signs?
The Allen Bradley 20DD077A3NNNA2NBB PowerFlex 755 AC drive commonly requires repair due to issues stemming from failed gate drivers, DC bus capacitor degradation leading to overvoltage faults, and IGBT failures caused by excessive current or thermal stress. Communication errors on the Ethernet/IP network are addressed through firmware upgrades or resolving network configuration conflicts. Overcurrent faults are resolved by inspecting motor insulation, adjusting acceleration/deceleration parameters, or replacing faulty current sensors. Troubleshooting often involves examining the control board for component-level failures and verifying proper heatsink fan operation to prevent thermal shutdowns.
Technical specifications
The Allen-Bradley 20DD077A3NNNA2NBB PowerFlex 700S is a 480V AC drive rated at 77 amps for normal-duty three-phase applications. It has an IP20/NEMA Type 1 enclosure, a numeric LCD display, and adjustable bus undervoltage trip. It lacks braking and extensive documentation, but provides 0.25 seconds of logic control ride-thru and 15 milliseconds of power ride-thru at full load, plus microprocessor-monitored heat sink protection.
Our Repair Process for the
20DD077A3NNNA2NBB
Our repair process for the Allen Bradley 20DD077A3NNNA2NBB PowerFlex 755 AC drive begins with a comprehensive diagnostic evaluation to pinpoint the root cause of the failure, whether it be gate driver malfunction, DC bus capacitor degradation, IGBT failure, communication errors, or overcurrent faults. Repairs include replacing failed gate drivers, DC bus capacitors, and IGBTs as needed, followed by thorough testing to ensure proper operation. Communication errors are rectified through firmware upgrades or network configuration adjustments. Overcurrent faults are addressed by inspecting motor insulation, adjusting acceleration/deceleration parameters, or replacing faulty current sensors. The control board undergoes a detailed inspection for component-level failures, and the heatsink fan operation is verified to prevent thermal shutdowns. Each repaired drive is subjected to rigorous testing under load conditions to guarantee optimal performance and reliability before it is returned.
Your Guarantee: Warranty & Lifetime Support
Your satisfaction is our top priority, and we confidently stand behind the quality of our repairs. That's why every repair service is covered by our comprehensive 24-month warranty. Furthermore, we offer lifetime phone support – if you have questions or need assistance related to our repair down the road, we're here to help. Our service commitment is straightforward: we guarantee our work, and if you're not satisfied, we will make it right. Learn More about our Repair process.
Comprehensive Repairs You Can Depend On
We take immense pride in the quality and reliability of our work. Our process goes beyond simply fixing the immediate problem. We perform a comprehensive inspection of your main board (or other equipment) and proactively replace components known to be failure-prone or showing signs of potential future failure. Before any item is returned, it undergoes rigorous functional testing to ensure it meets performance specifications and operates flawlessly. Visit our main Repair Services page to learn more.
Save Significantly
Our primary goal is to save you hundreds, or even thousands, of dollars compared to the cost of new equipment replacement. By repairing existing components, we provide an economical solution that is also eco-friendly. At Roc Industrial, our commitment to integrity and community drives our consistent growth and ensures you receive a reliable, cost-effective solution.
Please Note: Roc Industrial operates as an independent service provider and is not an authorized distributor for the manufacturers or brands mentioned. Consequently, the original manufacturer's warranty is not applicable to items repaired or sold by us. Roc Industrial provides its own 2-year warranty on all repair services performed.
Buying Options
To receive a quote within 2 hours, please provide us with the details of your requirements. Our team will promptly review your request and send you a custom offer.
Ships from Rochester, NY