Good afternoon, please assist me with a technical issue I am facing. I have set the PowerFlex 525 speed reference to Ethernet/IP, running at 60 Hz. However, the PLC is instructing it to run at 0 Hz, but it continues to run at 60 Hz. The commanded frequency (b002) is showing 60.0 Hz. Despite setting all speed references to 15 (Ethernet/IP), changing it to 1 (Drive Pot) brings the speed down to 0, allowing control with the pot. It seems that Ethernet is overriding the speed command. Has anyone encountered this issue before and can offer assistance? Thank you for your support.
After I realized my Frequency Command was set to -1, I inserted an AFI before my MUL instruction to reset it to 0, resulting in a decrease in speed to 0. Instead of using a MUL by 100 to calculate my command frequency, I am now utilizing REAL numbers to set my desired speed accurately.
Disregard this post as it was my mistake in the code. Apologies for the error.
In the discussion, Cydog mentioned the importance of using precise numbers when setting speed preferences, rather than relying on a simple multiplication by 100 to determine command frequency. For the PowerFlex 525, it is crucial to understand that the Reference and Feedback values are represented as 16-bit integers (INT), correlating to drive speed in 0.01 Hz increments. To achieve the desired Hz, it is necessary to multiply the value by a scaling factor of 100. For instance, if a speed of 32.5 Hz is required, the INT value sent to the drive would be 32.5 x 100 = 3250. When dealing with a REAL value, such as input from a user on a Human-Machine Interface (HMI), it is essential to not only apply the scaling factor (multiply by 100) but also convert the REAL result to an INT before transmitting it to the drive's output image. This adjustment in approach is highlighted to clarify any potential confusion, as it may appear that using REAL values throughout is a feasible alternative. Regards, George
Cydog admitted to making an error in the post, attributing it to their own code. Apologies were offered, with the reassurance that mistakes happen and there is no need to feel guilty.
Hey everyone, I need your immediate assistance. Recently, I upgraded from a PowerFlex 40P to a 525 and replaced three drives. Two of the drives are working perfectly with the correct speed reference, but the third drive's reference is 10 times higher than the actual speed. The reference is 39.1, while the drive speed is 3.91. I'm struggling to pinpoint the issue as all three drives have identical settings. Any suggestions on what could be causing this discrepancy? Your urgent support is greatly appreciated!
It sounds like you've done quite a bit of troubleshooting yourself already. From your description, it appears your drive is not taking speed reference from the Ethernet/IP. A potential cause could be a parameter lock issue - you might want to check if parameters are locked or protected. Also, make sure your PLC logic is actually sending the 0Hz command over Ethernet/IP. Try to monitor the tags which are transferring the speed reference, and see if it changes when you want the drive to stop. If all else fails, I would recommend contacting Rockwell support—they've been pretty helpful in the past for me on similar issues.
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Answer: This issue might occur when the drive is receiving conflicting speed commands from different sources, causing it to override the Ethernet/IP speed reference.
Answer: You can try changing the speed reference to another source, such as Drive Pot, to see if the drive responds correctly. This can help identify if the issue lies with the Ethernet/IP speed reference setting.
Answer: If the drive is not following the speed commands from the PLC over Ethernet/IP, you may need to check the communication settings, network configuration, and ensure that there are no conflicting commands being sent to the drive.
Answer: Yes, this issue has been encountered by others where the drive continues to run at a specific frequency despite the Ethernet/IP speed reference being set differently. Troubleshooting steps may be required to resolve this conflict.
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