Hello everyone, we currently have a Baumuller AC drive BM4463 300A 160KW paired with a Baumuller AC motor DST2-315BO54W-020-5-A (90KW; RPM 200; 365V; 215A; 83Hz). The drive rectifier experienced a short circuit, causing an arc flash in the Eaton NZM3 600V/630A circuit breaker it is connected to. Can I safely use this same circuit breaker for testing once the AC drive has been repaired? I am confident in my ability to repair the AC drive, but replacing the expensive $11000 circuit breaker is a concern. If I install a new circuit breaker and the repaired AC drive shorts out again, the new circuit breaker could also arc flash. Thank you for your input.
When dealing with high current devices, such as the one you have, safety should always be the top priority. If you have concerns about the repaired soft start potentially causing a short circuit and damaging a new breaker, it may be worth reassessing your repair and testing methods to ensure safety. We have had great experiences getting our large VFDs and soft starts repaired at a local company who always delivers professional results without any issues. For instance, one of our customers had a 400HP mill motor with power lead issues that damaged the soft start and breaker. We replaced everything, prioritizing safety over cost because human life is priceless. Additionally, we were able to find a rebuilt breaker at a fraction of the cost of a new one. Websites like Radwell and Superbreakers offer a wide selection of rebuilt and refurbished breakers at affordable prices for those in need of replacements.
We offer a remote-controlled device for activating circuit breakers, preventing any potential harm from arc flashing incidents. Thank you.
Without a doubt, it's important to ensure that both the AC drive and the circuit breaker are safe and functional before resuming operations. After the arc flash event, it's crucial to assess the integrity of the breaker. Even though the NZM3 is a robust piece of equipment, an event as severe as an arc flash can critically damage it, impairing its protective function and potentially jeopardizing safety later. Prior to reusing it, I would recommend that you have it thoroughly tested and inspected by a professional. This may seem costly now, but can save you a lot in terms of safety and possible downtime in the future if another failure occurs. It's better to err on the side of caution.
I'm not an electrician, but from personal experience, I'd be careful assuming a circuit breaker is in good shape after an arc flash. These large electrical surges can cause hidden mechanical or electrical damage within the breaker which may not be immediately apparent. They could degrade its protective features and make it less reliable or even dangerous. Therefore, I would definitely recommend having the circuit breaker thoroughly inspected or, if possible, tested by a professional before reusing it. Components often appear fine after such events but, in reality, they may not perform as expected when another fault occurs. Keep in mind the cost of a new breaker, as significant as it might seem now, may not compare to the costs that could result from another major failure or accident.
It's great to hear that you're confident in your repair skills! However, I would advise against using the same circuit breaker for testing after it has experienced an arc flash; it might have sustained damage that isn't immediately visible. Even if it seems to function correctly, it could fail under load, risking another arc flash. It's a tough call considering the cost, but for safety's sake, you might want to consider a lower-cost testing circuit breaker instead. This way, you can ensure you’re operating in a safe environment without risking equipment—or personnel.
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Answer: - Testing the Eaton NZM3 circuit breaker after repairing the AC drive is feasible, but caution must be exercised. Ensure that the repaired AC drive is functioning correctly to prevent any short circuits or arc flashes that could damage the circuit breaker.
Answer: - Before testing, thoroughly inspect the repaired AC drive to confirm that all issues causing the short circuit have been resolved. Use proper safety equipment and follow best practices for testing electrical equipment to minimize the risk of damage to the circuit breaker.
Answer: - While cost is a concern, it's crucial to prioritize safety. If there is uncertainty about the reliability of the repaired AC drive, it might be prudent to consider investing in a new circuit breaker to prevent any further damage or hazards.
Answer: - Operating a faulty AC drive with the circuit breaker can lead to additional short circuits or arc flashes, potentially causing further damage to the equipment and posing safety risks. It's essential to ensure the integrity of both the AC drive and the circuit breaker before conducting any tests
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