Product Description
The Allen-Bradley PowerFlex 700S 20DJ125A0QNNACNNN is a robust 600V AC, three-phase adjustable frequency drive designed for industrial motor control, featuring a 125-amp input, an IP20/NEMA Type 1 enclosure, no braking system, a blank HMI cover, adjustable undervoltage trip, heat sink thermistor protection, and ride-thru capabilities of 0.25 seconds (logic control) and 15 milliseconds (full load).
Is Your Device Showing These Signs?
The Allen Bradley 20DJ125A0QNNACNNN AC drive commonly requires repair due to IGBT failures stemming from overcurrent events or thermal stress. Capacitor degradation within the DC bus is a frequent issue, leading to under-voltage faults and operational instability. Encoder feedback problems, resulting in speed regulation errors and positioning inaccuracies, are addressed through encoder replacement or signal calibration. Communication faults on the Ethernet/IP network, often caused by corrupted firmware or faulty network interface cards, necessitate firmware reflashing or component replacement. Power supply failures, triggered by component aging or voltage surges, are resolved by replacing damaged components or the entire power supply unit.
Technical specifications
The Allen-Bradley PowerFlex 700S 20DJ125A0QNNACNNN is a durable 600V, 3-phase AC drive for industrial motor control. Key features include a 125A input, IP20/NEMA Type 1 enclosure, no braking, a blank HMI cover, adjustable undervoltage trip, heat sink thermistor protection, and short ride-thru capabilities.
Our Repair Process for the
20DJ125A0QNNACNNN
Our repair process for the Allen Bradley 20DJ125A0QNNACNNN AC drive begins with a comprehensive diagnostic evaluation to pinpoint the failure. Suspected IGBT failures are confirmed through testing, and replacement is performed using matched components. DC bus capacitors are assessed for degradation, and replacement occurs to restore proper voltage levels and stability. Encoder feedback issues are rectified through encoder replacement or precise signal calibration. Communication faults on the Ethernet/IP network are addressed by reflashing firmware or replacing the network interface card. Power supply failures are resolved by replacing damaged components or the entire power supply unit, ensuring stable operation.
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.

















