Hello, I currently have a set of three tanks equipped with Hardy 6600 series load cells. While two of the tanks are functioning well within calibration tolerances, the third tank is showing a negative value in both gross and net weight readings. Despite the value increasing as weight is applied, the program is unable to process this and displays zero on the HMI. Previous experience with these load cells and their controllers has allowed for zeroing, taring, and calibration adjustments. However, the lack of a controller between the load cells and analog input card presents a challenge in zeroing the values. Is there a method to zero these readings without a Hardy controller present? The HMI and PLC logic do not seem to offer a solution. Any insights or guidance on resolving this issue would be greatly appreciated. Attached are photos for reference. Thank you for your help.
I previously utilized a setup similar to that, consisting of 4 weigh stations equipped with 4 load cells each. Below, you can access instructions on how to calibrate each station. I have included two examples for your reference, but for more detailed guidance, visit hardysolutions.com for access to all manuals and additional examples.
Please view the attached document. I have a collection of manuals available. Feel free to contact me via private message to receive all of the manuals.
I appreciate your help. I successfully set up the HI6600 Weight Processor Modular Sensor System by following the Quick Start guide and HI6600 User Guide Book to configure my TCP/IPv4 settings for the correct network and node. I was able to access and adjust the settings and operations through a web browser, eliminating the need for a Hardy interface. It's convenient to be able to perform these tasks without additional equipment.
From what you've described, it sounds like a potential issue lies with the interpretation of output from your load cell. Hardy 6600 series load cells generally have a pretty stable performance so if two out of three are functioning correctly, I'd suspect the issue isn't necessarily with the cell itself. The absence of a controller, however, does seem to be an obstacle in this situation. In my experience, issues of this nature in the past were solved by having a controller to manage and correct the raw signal from the load cell. Although I cannot provide a specific solution due to potentially differing HMI/PLC models, I would suggest diving into the programming or configuration of the PLC. It might be that the PLC inputs need reconfiguring or programming to interpret the readings correctly. I hope this gives you a starting point and good luck with your debugging process!
Hi there, it seems like a rather tricky situation. Assuming your analog input card can read a millivolt/volt signal, you might be able to resolve this by incorporating an amplifier to the load cell circuit. The amplifier could effectively condition the signal before it reaches the analog input card, thereby enabling you to zero out your signal. Also, do verify the wiring and check if the load cell isn't damaged or needs replacement. Lastly, although PLC's may not provide an easy way to zero out the readings, there might be a possibility of tailoring the PLC programming logic to suit your purpose. Hope this helps steer you in the right direction!
It sounds like you're in a bit of a pickle with your third tank's load cell readings. Based on my experience with similar system configurations, even without a Hardy controller, it is theoretically possible to perform zeroing directly at the analog input level in your PLC logic. The specifics may depend on the PLC model you're using, but essentially you'll need to adjust the scaling on your analog values. Identify the raw count that corresponds to zero load (negative reading you see without load) and use that value as your zero point in your scaling. However, please remember any changes should be thoroughly tested to ensure accuracy, particularly where weights and measures are concerned. Always double-check and cross-verify with known loads after making any adjustments.
It sounds like you’re facing quite the challenge with that third tank! Since you’re lacking a controller, one option could be to manually adjust the signal output from the load cell using an external device or even a basic multimeter setup, provided you know the voltage range that corresponds to zero weight. Alternatively, check if your PLC has any built-in offset capabilities that might allow you to adjust the zero point in your programming. If all else fails, reaching out to Hardy’s technical support might uncover some specific troubleshooting steps they recommend for cases like this. Good luck!
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Answer: - To zero Hardy 6600 series load cells without a Hardy controller, you can try using external devices or manual methods for zeroing the readings.
Answer: - A negative value in weight readings could be due to calibration issues, sensor malfunctions, or improper connections. Troubleshooting these factors may help resolve the discrepancy.
Answer: - You may need to explore alternative methods for zeroing or recalibrating the load cells, such as using manual adjustments or seeking technical support from Hardy or a relevant expert in the field.
Answer: - If the HMI and PLC logic do not offer a solution, consider reaching out to Hardy customer support for guidance on alternative methods or tools that can be used to zero the load cells without a controller.
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