Near Intersection of I-35 & I-90 Southern Mn. | Trimble Man - 10/8/2013 04:31
Make sure "Rate Snapping" is set to "On". This will make the Ez-Boom behave more like other controllers. Most controllers actually fluctuate like this, except their displays don't change the decimal place, so it will read as the closest single digit, giving the appearance that it is holding a stable Rate.
If you feel it is still moving around, try reducing the "Allowable Error". This is the percentage "Off Rate" it has to be before it will try to correct. You can also try increasing the "Valve Response 2" setting. This adjusts how quickly the valve responds when it is close to its target rate.
If you go too far with either of these settings, your rate will really start to fluctuate. This can be seen sooner if you have a pressure gauge connected. Disabling Rate Snapping will also help when fine tuning the system, but don't forget to reenable once done.
Raven systems have the ability to have "Display Smoothing" ON or OFF. With it ON, the displayed applied rate will be the Target rate unless the system is considerably out of tolerance and then the actual applied rate is shown. With "Display Smoothing" OFF, the results of the various calculations are shown and it is common that the values would jump around somewhat. This feature was added several years ago when NH3 control became very popular. Since the NH3 numbers are typically larger and NH3 is more difficult to control, the feature was added to make the applied rate appear more solid. This gave inexperienced operators the "piece of mind" that all was well. One of our customers who wanted to be "unhappy" called it a coverup.
Since the EZ-Boom was made to copy a Raven, they offered this feature also but call it "Rate snapping". As the above Quote indicates, changing the Allowable Error and Valve Response 2 may improve your situation but then again they may actually make it worse. Using smaller orfices or tips would also provide more back pressure which may tend to stabilize the rate as long as the rate can be met without extreme pressure. The variation that you see seems reasonable and as you have said "I wouldn't worry about it".
Edited by tedbear 10/8/2013 07:22
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EZ Boom actual GPA accuracy - jumps around
