Greetings! Currently, I am setting up a PowerFlex 753 drive that is linked to a PLC Micro 850 using Ethernet IP. I have successfully managed to oversee the operation command and frequency from the PLC. However, I am facing an issue where the drive needs to retain the frequency and command status if communication is lost between the PLC and the drive. After consulting the 20-750-ENETR manual, I attempted to adjust parameter P33 to a value of 3 as suggested. Unfortunately, this modification did not yield the desired results. Do you have any insights or suggestions on additional steps I may need to take?
It is crucial for the customer to have a way to safely halt the drive to avoid potential legal issues. Make sure to also set Idle Fault to 3 in any case.
In a recent discussion, robertmee expressed concerns about the need for customers to have an external means of stopping drives to avoid potential lawsuits. It's important to note that simply assuming a stopped state is safe may not always be accurate, especially in industries like cooling water pumps, reactor agitators, and offshore drilling pumps. While a hardwired stopping method is essential, some sectors prioritize keeping equipment running until destruction to protect lives and the environment.
In certain scenarios, the safest option may be to keep equipment running, such as cooling water pumps, reactor agitators, and some offshore drilling pumps. However, it is crucial to have a secondary stopping method in place in case the primary control is lost. While some industries prioritize keeping equipment operational to prevent safety risks, it is essential to always have a backup plan for emergencies.
Hello! It sounds like you've almost got it figured out. If adjusting parameter P33 didn't work as intended, my first suggestion would be to double-check all other network settings and ensure that they are correct. Sometimes, a minor misconfiguration can cause such issues. Additionally, you could consider a programmed "fail-safe" state within the PLC itself that would prevent any changes in frequency if a communication loss is detected, essentially a manual override of the system defaults. However, remember this is only a workaround and you should take utmost precautions considering safety standards. Hope this helps!
From what you're describing, it appears you've followed the correct steps to ensure that the drive retains the frequency and command status, according to the manual. However, I would recommend you check the scan time on your PLC. If the scan is too fast, the drive might not have sufficient time to process any changes before the next scan command. If this doesn't work, you might consider revising the communication fault routine or potentially substituting your 753 drive with a PowerFlex 755, as the latter model has a Local Logic feature that covers communication loss.
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Answer: Answer: To maintain frequency and command on PowerFlex 753 when communication is lost, you can adjust parameter P33 to a specific value as suggested in the 20-750-ENETR manual. However, if this does not work, further troubleshooting may be required.
Answer: Answer: Parameter P33 on the PowerFlex 753 drive can be adjusted to help retain frequency and command status in case of lost communication with the PLC. Refer to the manual for specific instructions on adjusting this parameter.
Answer: Answer: If adjusting parameter P33 as suggested in the manual did not yield the desired results, consider seeking additional insights or suggestions from experts in the field or contacting technical support for further assistance.
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