TeeJet TASC-6600 - Manual (Page 72)

D-4
TASC-6000, 6300, 6600 98-05010
Rev. - 1
D.2.3. HANDGUN MODE, SPECIAL CONSIDERATIONS:
A. Pump Calibrations: The speed of the injection pumps during calibration is determined by the programmed test speed
("gallons per minute" or "liters per minute") and the programmed chemical application rate ("ounces per 100 gallons"
or liters per 1000 liters") or ratio ("gallons per gallon" or liters per liter). Set these numbers to your typical operating
conditions before doing the pump calibrations.
B. The injection pumps will operate at the speed necessary to apply the correct amount of chemical according to the
programmed carrier application rate, regardless of small variations in the actual carrier flow rate. (Large variations in
the actual flow rate lasting more than 5 seconds will cause an error shutdown of the sprayer). Thus, chemicals will
always be applied correctly, even if there is variation in the carrier output. (If the carrier rate is set to 0.0, see the
Manual Override of Flow Control Valve, Section D.2.5.)
C. Booms are not used in the handgun mode. If the TASC senses a boom "ON" condition it will indicate an "Err" and
will stop the injection pumps and close the flow control valve.
D. The initial response of the flow control valve to the selection of the handgun mode is to open fully. Once application
has started, the response of the flow control valve to the flow switch "OFF" condition is to "HOLd" the valve in the
partially open condition. The CLOSE valve response is not selectable while operating in the handgun mode.
E. The values programmed into the TASC console while in either the Handgun or Normal mode will remain in console
memory, even when the opposite mode is selected.
F. If operating with a flowmeter, selecting TEST SPEED on the TASC console, while in the "OPERATE" mode, will
cause the flow control valve to adjust flow to the test rate selected and the injection pumps to control to the pro-
grammed test rate.
D.2.4. HANDGUN MODE, TYPICAL OPERATION:
A. Set the Normal/Handgun switch to "Handgun", the Boom switch to "Auto", and the Ground Speed Override Switch to
"OFF".
B. Select "SET-UP" for the TASC console mode selector. Program the TASC console as necessary (See SET-UP Mode,
Section D.2.1).
C. Zero the accumulated rates and set the desired carrier flow rate as necessary.
D. Select "OPERATE" with the TASC console mode selector switch. The initial response of the flow control valve is to
drive fully open.
E. Turn "ON" the desired chemical injection pumps.
F. Close the valve leading to the spray boom.
G. Be sure the carrier pump is operating. Turn on the handgun. As soon as the flow switch senses flow, the console will
begin to adjust the flow control valve (after a short delay to allow flow to stabilize) to achieve the desired flow in
gallons per minute. At the same time the chemical injection pumps will be activated at the speed necessary to apply
the desired rates of ounces per hundred gallons, according to the programmed target carrier rate. There is no delay to
the control of the injection pumps. (NOTE: the carrier flow rate is the sum of the carrier and the injected chemicals.)
H. Turn off the handgun. The chemical injection pumps will stop immediately. The flow control valve will hold its
position so that flow will be immediately available at the proper rate when the handgun is again activated.
I. Set the Normal/Handgun switch to "Normal" and the flow control valve will automatically go closed. Open the valve
leading to the spray boom. The TASC console will then be ready for the previously programmed broadcast spraying
operations.