Digi-Star GT460 - Manual (Page 23)

Re-Calibrating The Scale
Example Application 2: Grain cart with GT460 AutoLog
2
system is to
activate an alarm in tractor cab for 10 seconds to notify operator once
35,000 pounds is unloaded, so that the door can be closed. The operator
has a history of overloading the truck by 5000 pounds each time.
Set 477 ALP to ON. Set 406 RELAY to PRNOPA. Set 475 PAST to 10.0.
Set 442 to WEIGHT; TOLER to 5000. Press 35000 then ENTER to store
preset weight. Connect green DC Output wire to alarm +12VDC, black to
ground.
Operation: Start PTO, GT460 automatically loads 35,000 pound preset.
Open door to unload grain. Target weight is reached 5000 pounds early,
sounding alarm for operator to close the door. The preset is deactivated at
30,000 pounds to correct for overfill, and the data is logged when the PTO
is stopped.
RE-CALIBRATING THE SCALE
To re-calibrate the scale and make it even more accurate, document at
least 3 to 6 loads of varying sizes and measure the actual weight of all
loads on a certified scale.
• It must be assured that each truck is not losing grain in transit to a
certified scale.
• Weigh the truck immediately before unloading and immediately
after unloading to minimize errors due to changes in fuel etc.
In this example, six carts of grain are unloaded into four semi-trucks.
Example:
Cart Load A 51560
Cart Load B 33240
Cart Load C 17620
Cart Load D 50420
Cart Load E 38200
Cart Load F 12360
Total Indicator Weight 203400
Truckload #1 51920
Truckload #2 51320
Truckload #3 50720
Truckload #4 51070
Total Certified Weight 205030
D3804 GT460 AutoLog
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Operators Manual 23