Greetings, I am currently working with AB Studio 5000 and utilizing a PowerFlex 755T drive to control a conveyor to a specific set point. The set point is inputted on a panel in Feet/Minute (FPM), while the drive can be controlled in RPM (0-1500 rpm) or in Hz (0 - 60Hz). In order to convert FPM to RPM, the formula used is RPM=(FPM∗12)/(π∗Diameter). To display the feedback from the drive, the RPM needs to be converted to FPM for visualization on the panel (FPM= RPM* Diameter * π). Is there a simpler method for this conversion, or must I continue using these formulas? Any assistance would be greatly appreciated. Thank you in advance for your help. Best regards, Frederik
Don't stress about calculating circumference and diameter - simplify with a single multiplier and a hand-held tachometer. Set your desired feet per minute (FPM) and tach the belt to find the right RPM for the drive. Adjust the FPM by multiplying it with a coefficient until your tachometer matches your set point (SP). Repeat the same process in reverse to get feedback. This method streamlines the process and ensures accuracy in belt speed adjustments.
Thank you for providing the response. I have created two options for on-site selection, allowing users to choose their preferred method.
Hi Frederik, Your current conversion methods are fundamentally correct and precise. Software-wise, it may get intricate, but mathematically that is the conversion. If you desire a simpler way, you could possibly streamline the process by creating a conversion function in your PLC code. This function can accept the FPM as input, carry out the computation, and output the RPM. This way, you can call the function whenever needed in the code, making your program cleaner and less complicated. Additionally, the same method could be used to reverse the process for feedback display. Remember to consider drive efficiency and slip, if applicable.
Hi Frederik, Your method to convert between FPM and RPM is mathematically correct. As of today, these conversion formulas are the most straightforward way to get your desired output considering your equipment settings. However, since you're programming this calculation directly into AB Studio 5000, you can keep this conversion clean by defining it as a custom function in the software, allowing you to call it whenever it's needed. You'd be implementing the same formulas, just behind the scenes, making your overall coding cleaner and easier to read. Hope this helps! Cheers!
Hi Frederik, From your explanation, it seems like you're on the right track. These are indeed the necessary formulas to translate between FPM and RPM based on your equipment's diameter. While it might seem a bit inconvenient, it's quite essential for precision. However, you could create a function or subroutine in your program where these conversions take place, that way you don't have to repeatedly enter the formulas all over your code. Also, most SCADA or HMI interfaces for visualization purposes, such as your panel, should give the option to include such formula conversion inside the interface. This might make your work a bit easier. Keep up the good work! Best, [Your Name]
Hi Frederik, Your conversion process seems to be correct in the given scenario. While these equations might initially feel cumbersome, they're fairly standard in maintaining unit consistency in applications like these. If the process feels tedious, you could consider applying automation in your PLC code to perform these calculations. This would limit manual input errors and streamline the process. However, always remember to revise your code and do the necessary checks to ensure it's operating correctly. Hope this helps!
Hey Frederik, your approach with the formulas for converting FPM to RPM and vice versa is solid and definitely a standard method in the industry. However, if you're looking for a simpler way to handle the conversions, you might consider creating a lookup table or using a scaling function within your control software. This could reduce the computation load during runtime and make it easier to pull values. Depending on your control system, it might also support easier direct input/output conversions, which could streamline your process even further. Good luck!
Hey Frederik, it looks like you've got a solid handle on the conversions you need, but I totally get that it can feel a bit cumbersome. Have you considered using a scaling function in your AB Studio setup? That way, you could set up a direct correlation between FPM and RPM without constantly doing the math each time. It could simplify your input and output processes, making the operation more streamlined. Just a thought! Good luck with your project!
Hi Frederik! It looks like you’ve got a solid grasp of the conversions needed for your application. While the formulas you've mentioned are standard, one way to simplify your workflow could be to create a small lookup table or a function in your control software that directly maps FPM to RPM and vice versa based on the diameter. This way, you can minimize repetitive calculations and improve response time on the control panel. Also, if you’re working with fixed diameters, pre-calculating some common values might save you time in programming. Hope that helps streamline your setup!
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Answer: - To convert FPM to RPM, you can use the formula RPM = (FPM 12) / (π Diameter). For the reverse conversion, FPM = RPM Diameter π.
Answer: - While the formulas mentioned are commonly used for conversion, you can explore automation or scripting options in your control system software to simplify the conversion process.
Answer: - The PowerFlex 755T drive typically operates in RPM or Hz, so converting the setpoint from FPM to RPM or Hz is necessary for control purposes.
Answer: - You can convert the RPM feedback from the drive to FPM using the formula FPM = RPM Diameter π, and then display this value on the control panel for visualization.
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