Near Intersection of I-35 & I-90 Southern Mn. | johndeere76 - 1/21/2017 11:42
Yes, lots of ways to do it depending on your controller. Just have to find a motor that will turn the meters and the rest is the same concept as your seed drives. Once calibrated you should be good to go. Only limitation would be your meters, you won't have a different range then you currently have now without changing the rollers. You can't just spin the shaft faster and expect to put on more product, at some point it will not fill the cups full before dispensing the fertilizer.
The above is correct and true for most any type granular delivery system. With a liquid system where the flow is measured with a flow meter this can work out nicely. Within limits, the electrical pulses that the flow meter creates are directly proportional to the quantity moving through the flow meter. For example at 10 Gallons/minute, the flow meter will produce a certain number of pulses/minute. At 20 Gallons/minute that flow meter will produce twice as many pulses/minute. So the system can accurately measure the output over a fairly wide range. If the flow rate is too slow, the turbine stops and no pulses are produced, at higher than recommend rates there are problems with reduced flow. This is why flow meters are made in a variety of sizes. The ranges typically overlap so in many situations there may be more than one choice
In a granular system, the quantity is usually measured by use of a shaft sensor. The system will operate under the assumption that the number of pulses it sees is in direct proportion to the flow of the product. The number that converts these pulses to gallons or pounds is the meter cal. Here's where a problem can come in. With many granular systems the output is not in direct proportion to the shaft speed. Turning the shaft twice as fast does not necessarily deliver twice the product. This is due to the type of dispensing system (metering wheels, auger etc.). Another potential problem is flowability. The same product may not flow as easily one day as another due to humidity etc. Within limits this approach can be used if one is careful and alert to this potential problem.
As the above post mentions, if the metering system runs too fast it may actual deliver less product than when running slower as metering wheels etc. may not have enough time to get full.
Edited by tedbear 1/21/2017 14:25
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Granular fertilizer drives
