Hello everyone! I am currently working on reading values from a Loadcell using a 2080-TC card. Although the 2080-TC is commonly used as a thermocouple card, it can also read millivolts which is the signal I require. By setting the TC as type K and referring to the Type K Thermocouple Reference Table, along with the formula: Connected Components Workbench software Data Count = (Temp (°C) + 270.0)*10, I have determined the counts needed for input (2700 for 0 mV and 7550 for 20 mV). The system I am working on resembles a large pulley. When the load is stable, the PLC reads a consistent value. However, when the pulley is in motion, the input value fluctuates from low to high continuously. Does anyone have any insights into what could be causing this issue? In addition, I have successfully implemented a similar setup using a Siemens PLC 1214 with AI1 x TC (6ES7 231-5QA30-0XB0). I also utilized an 0-20 mV calibrator to verify the channel, obtaining readings of 2700 counts at 0 mV and 7750 counts at 20 mV.
What is the frequency of mechanical variations in bearing stick/slip behavior and can it be correlated to mechanical factors?
Steve Bailey inquired about the frequency of variations and its potential correlation to mechanical factors such as stick/slip in the bearing. The frequency changes every second, unrelated to any mechanical aspects. Initially set at 16.7 Hz for data update rate, it was later adjusted to 10 Hz, but still experienced fluctuations every second.
Is it possible to display a chart showing the fluctuation in value over a specific period, while the load stays consistent?
Steve Bailey inquired about generating a graph displaying the value over time with a consistent load. The load measured approximately 6900 lb (1.5mV from the load cell with a gain of 4300 Lb per mV). Instead of using graph software, I captured a video showcasing the load values as the pulley moved. Through a previous test using the same Loadcell connected to a Siemens PLC with a TC card, I determined that the load remained around 69xx weight while the pulley was in motion. The graph shows 23 seconds of fluctuating values.
I will test the 2080sc-IF4u spectrum card to determine if it meets my requirements.
It sounds like the fluctuation in values could be due to vibrations or mechanical stress when the pulley is in motion, causing changes in the electrical output. Since load cells are highly sensitive to external forces, any additional inadvertent force can impact your readings. You might want to consider using a noise filter or dampening method to stabilize the load cell output. Additionally, make sure the electrical connection to your load cell is stable and interference-free. A fluctuating power source could also be causing the changes in values. You may want to cross-check it with another power source to be sure. Keep us updated on your progress!
From what you've described, it sounds like the fluctuations might be due to changes in the load or the tension on the pulley when it's in motion. This fluctuation could be triggering the changes in the mV readings on your 2080-TC card. Given that the system works well with a stable load, but starts fluctuating while in motion, you might want to consider mechanical factors that could be altering the load distribution or strain on the Loadcell. In terms of solutions, you could potentially use a load stabilizer or a more consistent mechanism to control the motion of your pulley. Alternatively, you might want to look into a kind of signal conditioning to filter out the noise.
It sounds like you're doing a great job with your setup! The fluctuation you’re experiencing when the pulley is in motion could be due to a few different factors. Mechanical vibration might be affecting the load cell readings, or there could be electrical noise introduced into the system. Consider checking the wiring for any loose connections or shielding to reduce noise, and if possible, try to implement some averaging in your software to smooth out the readings during movement. It might also help to physically isolate the load cell from any vibrating components if you haven't already. Good luck!
It sounds like you're on the right track with your setup! The fluctuations you’re observing when the pulley is in motion could be due to several factors. Mechanical vibrations or rapid changes in load can introduce noise to your readings, causing instability. Additionally, ensure that your grounding and shielding are adequate; any electrical interference can also lead to erratic behavior in the readings. Have you thought about implementing some sort of filtering or averaging in your software to stabilize the input while the system is in motion? That could help smooth out the fluctuations.
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Answer: Answer: To read 0-20mV Loadcell values with a 2080-TC card on a Micro850 PLC, you can set the TC as type K and refer to the Type K Thermocouple Reference Table. Utilize the formula: Connected Components Workbench software Data Count = (Temp (°C) + 270.0)10 to determine the counts needed for input (2700 for 0 mV and 7550 for 20 mV).
Answer: Answer: The fluctuation of the input value while the pulley is in motion could be caused by various factors such as vibrations, mechanical movement affecting the loadcell, or electrical interference. It is essential to check for any external influences affecting the loadcell readings.
Answer: Answer: Yes, the 2080-TC card can be used to read millivolts in addition to its primary function as a thermocouple card. By setting the TC as type K and following the necessary calculations, you can accurately read millivolt values with this card
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