Hello everyone! In our factory, we utilize Rotary Lobe Pumps that are linked to the Allen Bradley "PowerFlex 70" Variable Frequency Drive (VFD). I am curious to know how we can operate these Rotary Lobe Pumps in the "reverse" direction using the Allen Bradley HIM (Model: 20-HIM-C3S) in order to conduct calibration for "negative" flow rates. I attempted to use the "left-right half arrow" button to switch the pump's direction to "reverse", but the HIM continues to display the symbol for "Forward" instead of changing it to "Reverse" at the top left corner, as illustrated in the photo attached. Please refer to the image for more information.
When the drive is set to "auto", it will receive direction commands from either the IO or communication systems. If you are unfamiliar with this particular drive, you can switch between automatic and manual modes to adjust speed and direction using the buttons. Additionally, many drives have a parameter to prevent reverse operation. I once encountered this issue with a Siemens V20 drive, which changed this parameter during the setup process.
To determine if reverse is disabled, review parameter 190. The default setting is "0", while a setting of "2" indicates that the reverse function is turned off.
Hi there, it appears you're doing everything correctly, however, if the HIM keeps displaying the 'Forward' direction, there might be some safety or configuration settings preventing the reverse operation. Do you have some sort of parameter lock enabled in your VFD? You may need to enter the Config menu and change these settings to allow the direction change. Also, do not forget to ensure it's safe to run your pumps in reverse as not all pumps are designed to operate in both directions.
It sounds like you’re on the right track with using the HIM to control the direction, but some VFDs require specific parameters to be set before reversing the pump direction. Make sure you check the drive configuration settings to see if reverse operation is enabled. You might also want to verify that the "Direction" parameter is correctly mapped to the HIM; sometimes it needs to be set up in the programming. If everything seems correct, it's worth consulting the manual for any additional inputs or conditions required for reversing operation. Good luck!
It sounds like you're dealing with a tricky situation! Typically, the ability to reverse a pump using a VFD depends on the parameters set in the PowerFlex drive, so you'll want to check if the reversing feature is enabled in the configuration settings. It's possible that you need to look at the control logic settings for your HIM or even adjust parameters like "Forward/Reverse Control" in the menu. If all else fails, consulting the manual or reaching out to Allen Bradley support might give you the specific guidance you need. Good luck with your calibration!
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Answer: Answer: To operate the Rotary Lobe Pumps in reverse using the Allen Bradley HIM (Model: 20-HIM-C3S), you can try using the "left-right half arrow" button to switch the pump's direction to "reverse." If the HIM display does not update to show "Reverse" at the top left corner as expected, there may be additional steps or settings needed for the reverse operation.
Answer: Answer: Operating the Rotary Lobe Pumps in reverse allows for calibration of negative flow rates, which is essential for accurate measurement and control of fluid movement in industrial processes. This calibration helps ensure precise monitoring and adjustment of flow rates in both directions.
Answer: Answer: If the HIM display does not update to indicate the reverse direction when trying to operate the Rotary Lobe Pumps in reverse, you may need to check the VFD settings, wiring connections, and programming to ensure that the reverse operation is configured correctly. Consulting the user manual or contacting Allen Bradley technical support for assistance may also be helpful.
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