Hello, I hope you're having a great day! I am looking to enhance the deceleration of my motor by installing a braking resistor on my Mitsubishi inverter FR-A720-1.5k. However, after trying to do so by connecting it to terminals P/+ and PR and setting PR.30 to 1 and PR.70 to 10%, I did not see any improvement in deceleration time. I am wondering if I am missing something or if the braking resistor is not working properly. Your assistance with this issue would be greatly appreciated. Thank you for your help.
Merely adding a braking resistor does not automatically shorten the deceleration time. To achieve faster deceleration, it is essential to adjust the time settings in the parameters. By dissipating the load's kinetic energy, the resistor enables a decrease in deceleration time without risking overloading the drive's DC bus. This process is crucial for efficient energy management and optimizing machinery performance.
To adjust deceleration time, simply modify parameter P9 by increasing the value from 0 as needed. Make the necessary adjustments and review the outcomes for optimal performance.
In order to adjust the deceleration time of your motor, you can modify parameter P9. Increase the value as needed and observe the results. It's important to note that simply adding a braking resistor does not automatically decrease the deceleration time; you need to adjust the parameter settings accordingly. The resistor helps in dissipating the kinetic energy of the load, enabling a reduction in deceleration time without causing issues with the drive's DC bus. Despite setting the deceleration time to 2 seconds, the motor continues to rotate for approximately 10 seconds after receiving the stop signal. This issue is particularly relevant as the load weighs around 50kg.
momo1234 expressed gratitude for adjusting the declaration time setting to 2 seconds. However, the motor continues to rotate for approximately 10 seconds after receiving the stop signal (inverter stopped output voltage) despite the change. The load being carried is around 50kg. Ensure to inspect the motor brake gap, which should ideally be between 0.5mm to 0.8mm. It is recommended to first check this manually before testing in auto mode. The process can be verified in manual mode. Additionally, it is crucial to monitor the brake voltage to ensure its functionality during operation.
As an expert in Mitsi drives, I want to address a few key points. The deceleration time is actually controlled by Parameter P8, not P9 which is designated for setting the motor's full load current. If the power output stopped during deceleration, the drive may have entered a fault mode. Check the display for a fault code, as this can provide valuable insights for troubleshooting. Mitsi drives store a fault history that can be reviewed to identify any previous faults that may have occurred.
Hi there, you seem to have the basics covered, but I wonder if you've checked your resistor specifications relative to your inverter needs. The resistance and power rating needs to match, else the braking won't be effective. Also, ensure that the wiring is done correctly to the P/+ and PR terminals. Lastly, did you remember to set PR.400 (Deceleration time 1) to the desired deceleration time? These could be potential areas to review if you haven't addressed them yet. Hope this helps.
Hi there! It's possible you may have trouble with the resistor itself, but before jumping to conclusions, let's double-check on those settings. Remember, setting PR.30 to 1 only means the inverter will use a braking resistor when necessary. The deceleration time might be unaffected if it doesn't need extra braking for your normal usage. For PR.70, a setting of 10% implies that only when your regenerative energy reaches 10% of the inverter capacity will the resistor kick in to help with braking. This might still be too low to see a substantial decrease in deceleration times. Try a higher percentage and see if that helps. If not, there might be an issue with your resistance value or the resistor connection.
Hey, hope you're well. Sounds like you've done everything correctly with the resistor installation. If you notice no improvements, the issue might not necessarily lie with the resistor. Given that your Mitsubishi inverter is an FR-A720-1.5k model, it's also crucial to check the capacity of your braking resistor and ensure it matches the inverter's capacity requirements. An underrated resistor would indeed cause such problems as it would struggle to efficiently absorb high power generated during deceleration. Also, try playing around with your parameter settings. For example, you could gradually increase your deceleration time % (PR.70) from 10% to see if there are any improvements. If the issue persists, you might want to consider having a professional take a look at it.
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Answer: 1. How can I improve motor deceleration with a braking resistor on a Mitsubishi inverter FR-A720-1.5k? - To enhance motor deceleration, ensure the braking resistor is properly connected to terminals P/+ and PR. Adjust settings PR.30 to 1 and PR.70 to 10% for optimal performance.
Answer: - If there is no improvement in deceleration time, double-check the connection of the braking resistor to the correct terminals and verify that the settings on PR.30 and PR.70 are correctly adjusted.
Answer: - If the braking resistor is not working as expected, troubleshoot by ensuring proper connections, verifying settings, and checking for any physical damage or malfunctions in the braking resistor itself. If issues persist, consult the inverter's manual or contact technical support for further assistance.
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