8/17/2012 4:34 PM | |
Posts: 74 Rating: (3)
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Hello vinaymaithani
You have a team of Siemens support at www.siemens.com/automation/support-request However, I can make a few suggestions. Since Iron ore is a high dK material, the LR will be more sensitive to build-up than with (for example) cement. So first is to check the horn and especially in the emitter area (the little white pyramid in the smallert part of the horn) is clean. If this area is building up, it may be necessary to purge (timed purge with clean air). One thing to realise is that if there are flow problems in the silo, you may have multiple levels and that may confuse the instruement. Other tips: Make sure the instrument has a clear shot to the material level, no obstructions and not in the path of material filling. Are you mounted close to the silo wall and are we seeing any joints? If there are obstructions, you may want to "learn" the instrument past the obstruction. Note that it may also be helpful to learn the instrument at least out to 1 m or beyond the outlet of any nozzle. Check the manual http://support.automation.siemens.com/WW/view/en/26095962regarding Auto False Echo Supression (AFES). If in the material fill path, you should consider moving it. It it usualy best to either point the unit straight down or towards the draw point. Try adding a little 3.5.2.5 Reform of about 5. The LR460 uses First echo as a default algorithm. You could try cahnging 3.5.2 to bLF to see if anything improves but please do this last. Note that First algorithm is weighted towards firdt. It will pick the second echo if it is significantly larger, for example. Your tool for troubleshooting (without Simatic PDM) is signal strength and confidence. 3.5.2.1 and 3.5.2.2. In worst case conditions (filling) Confidence should be above 10 most of the time. Before you get back to us let us know when the symptoms occur and the above readings when the instrument is reading correctly and in error. Best Regards Toppie [ |:) |
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