TeeJet TASC-6600 - Manual (Page 57)

B-5
TASC-6000, 6300, 6600 98-05010
Rev. - 1
B.2.3. FLOW CONTROL VALVE
TASC requires a flow control valve in the main boom supply line to provide automatic carrier control. This valve
throttles the carrier flow in response to commands from the control console. To be effective in controlling carrier flow,
the valve must be fast acting and precise in its movements.
The flow control valve may take the form of a hydraulic flow control valve controlling the flow rate by controlling the
speed of the product pump.
Sometimes a sprayer is already equipped with an electronically controlled flow control valve. If the valve meets the
necessary speed and precision requirements, it can be adapted for use with TASC. Check with your MID-TECH dealer,
or the factory, regarding the adaptability of a specific valve.
B.2.4. GROUND SPEED SENSOR
TASC requires an accurate ground speed sensor. A magnetic pickup, wheel sensor is standard equipment. This sensor,
mounted on a non-driven wheel, has proven to be very accurate and dependable for most spraying operations.
An optional radar ground speed sensor is available from MIDWEST TECHNOLOGIES for applications where wheel
slippage and variations in ground conditions are a concern. The radar sensor does not depend on ground contact and is
unaffected by these variables.
Some sprayers may already be equipped with a ground speed sensor. If the speed sensor meets the accuracy require-
ments, it can be adapted for use with TASC. Check with your MID-TECH dealer, or the factory, regarding the adaptabil-
ity of a specific sensor.
B.2.5. BOOM INTERFACE
TASC needs to know when each boom section is activated, in order to adjust chemical flow rates appropriately. The
console recognizes the activation of each boom section, whenever it receives a positive voltage on the boom interface
connection corresponding to that boom position. The console is capable of sensing and responding to nine separate
boom sections. The console can also sense the operation of an independent, status switch which would result in a shut
down of all chemical injection pumps and a selectable response by the Flow Control Valve (position held or full clo-
sure). Finally, the Boom Interface can be equipped with an optional Ground Speed Override switch.
The standard TASC System is supplied with a five position boom interface cable. The cable plugs directly into the rear
of the TASC console and allows connection to up to five boom sections, an optional ground speed override switch and
an optional status switch. A nine boom interface cable is available for larger sprayers.
An optional boom control switch panel, with interface, serves those sprayers not already equipped with electrical boom
control devices. The switch panel can power up to nine boom control valves, and acts as an interface for an independent
status switch. The switch panel plugs directly into the back of the TASC Control Console and receives power from the
vehicle battery. Models are available to control both solenoid and rotating valves.
B.2.6. PRECISION INJECTION PUMPS
MID-TECH uses precision peristaltic pumps to meter individual chemicals into the main boom supply line of the
sprayer. Peristaltic pumps use rollers to squeeze a flexible tube, forcing a volume of fluid through the tube ahead of the
advancing roller. Each pass of a roller over the tube forces out a consistent volume of chemical. The inherent precision
and broad operating range of the peristaltic pump makes it work extremely well as the metering device used with TASC.
The pumps MIDWEST TECHNOLOGIES supplies with TASC include their own DC motor and motor control module.
The motor control module uses modern, solid state electronics to switch power to the motor directly from the battery.
Special, high torque motors are used to provide positive rotation at all speeds.