I trust everyone is doing great. I am currently in the process of transitioning from a PF 40 to a PF 525, with speed communication taking place over Ethernet. The primary challenge I am facing is that the speed reference is not aligning correctly. For instance, when we input 60Hz on the HMI, the drive is only registering 12Hz. Is there a specific parameter within the drive that can be adjusted to synchronize the speed accurately, without having to modify the PLC logic?
Instruct the 525 on where to obtain its reference, whether from the HMI, Ethernet, or Terminal Block. Find detailed information in the manual provided.
The Basic Program Group includes essential features such as Min/Max frequency, start source, and speed reference. Find more details on P043 - 051.
D4niel mentioned that he is in the process of transitioning from a PF 40 to a PF 525 drive, with communication taking place via Ethernet. However, a discrepancy in speed reference has been identified. Despite setting 60Hz on the HMI, the drive is only registering 12Hz. Is there a specific parameter that can be adjusted within the drive to align the speed accurately without necessitating changes to the PLC logic? It is important to note that the PF40 utilized a scale of 0 to 32767 for 0 to maximum Hz, whereas the PF525 uses 0 to 100 times Hz, resulting in a different scale. This discrepancy explains why the displayed speed is 12Hz instead of 60Hz.
In a forum discussion, a user named robertmee suggested a necessary modification in the PLC program to account for differences in frequency scaling between PF40 and PF525 drives. While PF40 utilizes a range of 0 to 32767 for frequencies up to 60 Hz, PF525 operates on a scale of 0 to 100 times the Hz value, meaning 6000 for 60 Hz. The discrepancy in scaling results in an output of 12 Hz instead of the expected 60 Hz. It is essential to adjust the program accordingly to ensure accurate frequency control.
Recently, I upgraded from a PF40 to a PF525 using Ethernet communication. The compatibility of this upgrade depends on the specific controller being utilized, in this case, a 5380 model. In the multiplication operation, Source A originates from the HMI, while Source B is determined by the factor as suggested by robertmee. The result of this operation is sent to the PF525 drive. When dividing, Source A is taken from the PF525, Source B is the factor, and the outcome is displayed on the HMI screen.
It sounds like an interesting transition! Typically, issues with signal misalignment like you're experiencing can often be linked to parameters related to the speed reference scaling or feedback loop settings in the drive. Have you checked the parameter settings for frequency reference scaling or any input configuration features? Sometimes there’s a specific input voltage range that needs to align with your HMI settings. It might be worth diving into the manual for guidance on how to adjust those parameters without touching the PLC logic. Good luck, and I hope you get it sorted out soon!
It sounds like you're dealing with a tricky calibration issue! Have you checked the speed reference scaling parameters on the PF 525? Sometimes, the drive might have settings like "Speed Reference Gain" or "Max Speed" that could need adjustments to ensure it aligns with your HMI input. Also, make sure that the communication settings and any app configuration on the PLC are configured correctly to match the drive's requirements. Good luck with your transition!
It sounds like you're dealing with a tricky situation! In cases like this, it might be worth checking the scaling and feedback settings in the drive’s parameters. Some drives have a parameter specifically for input signal scaling that can affect how the frequency data is interpreted. Also, make sure that the basis of your frequency input (like speed reference scaling) matches between the HMI and the drive. If it's not aligning, it could lead to that discrepancy you're seeing. Good luck, and I hope you get everything synced up smoothly!
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Answer: 1. Q: Why is the speed reference not aligning correctly when transitioning from PowerFlex 40 to PowerFlex 525 over Ethernet? The issue could be related to a specific parameter within the drive that needs adjustment to synchronize the speed accurately.
Answer: It may be possible to adjust a parameter within the drive to ensure proper speed alignment without needing to modify PLC logic.
Answer: Yes, by identifying and adjusting specific drive parameters, it may be possible to synchronize the speed reference accurately without extensive PLC logic modifications.
Answer: By understanding the drive's parameters related to speed control and making appropriate adjustments, you can potentially resolve the alignment issue without extensive changes to the PLC programming.
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