TeeJet TASC-6600 - Manual (Page 43)

6-1
TASC-6000, 6300, 6600 98-05010
Rev. - 1
6.0. EMERGENCY OPERATIONS
MIDWEST TECHNOLOGIES has strived to make TASC as fool proof and reliable as possible. However, we realize
that problems can occur. If the operator is experiencing a failure of the ground speed sensor, the main flow control valve
or, the flow meter, the first step is to carefully check the wiring harnesses for obvious problems and follow the suggested
troubleshooting advice outlined in Section 5.0. in this manual. Assuming there is no success in getting the failed compo-
nent to respond, MIDWEST TECHNOLOGIES suggests the following procedures as a temporary measure until the
component can be fixed or replaced.
If the operator chooses to use any of the following procedures, he should recognize that the accuracy of applica-
tion is reduced. If this reduced accuracy is acceptable these procedures will allow the operator to continue on a
temporary basis.
6.1. GROUND SPEED SENSOR FAILURE
The TASC Control Console internally generates a speed signal when operated with the Ground Speed Override (GSO)
feature activated and the sprayer moving. When the unit is operated in the GSO mode, TASC establishes the rate as if
the vehicle were actually moving across the field at the programmed GSO speed. This feature can be used to operate the
sprayer in the event of a failure of the speed sensor. Application rate accuracy is reduced when operating under
these conditions.
A. With the vehicle stopped, set the console switches to the following positions:
All booms OFF
Power ON
Mode Selector SET UP
Display Selector SPEED
Using the INC/DEC switch, set the GSO speed for the normal spraying speed, (See Section 2.10 for
additional information).
B. Set the Mode Selector switch back to OPERATE and make sure the appropriate chemical injection switches
are selected to the desired rate. Start the vehicle and proceed to the application area, accelerating to normal
spraying speed (as close as possible to the GSO speed value). As the vehicle reaches the start of the desired
swath, turn on the booms and begin spraying.
C. TASC controls application of the carrier and the injected chemicals as if the vehicle were moving at the
established GSO speed. The actual accuracy of application therefore depends upon the ability of the operator to
maintain the desired vehicle speed. If the vehicle is traveling at exactly the established GSO speed, the applica-
tion is nearly exact. If the vehicle is traveling faster or slower than the established GSO speed, the application
rate is under or over the desired rate by a proportional amount.
D. All TASC functions, other than responding to speed changes, operate normally. The console still keeps track of
the total chemical and carrier applied by the sprayer, and the application rate responds normally to changes in
boom width. The readout of instantaneous application rate is meaningless under these conditions.
E. The console display continues to flash "Too Slow", and an audible alarm sounds ,to indicate abnormal opera-
tion.