Raven SCS 450 Installation & Service Manual page 53

Issue
Cannot vary the RATE in automatic or
manual operation.
The sprayer pressure is correct, but the
RATE is low.
TOTAL VOLUME does not register.
TOTAL VOLUME registers the flow
inaccurately.
Motorized control valve rotates more than
1/4 turn.
There is water inside the cover of the
motorized control valve.
Boom solenoids will not function.
Manual No. 016-0159-831
Preventative Maintenance & Troubleshooting
Corrective Action
Check the cabling to the motorized control valve for breaks in
1.
the line.
Verify the cable connections are clean.
2.
Verify that there is voltage to the valve connector.
3.
Turn the Master switch ON.
a.
Switch the RATE 1/RATE 2/MAN switch to MAN.
b.
Turn the POWER switch ON.
c.
Manually operate the INC/DEC switch to verify voltage.
d.
Verify that the valve is turning. If not, replace the motorized
4.
control valve.
Verify that the nozzle strainer screens and check valves are not
1.
plugged.
Verify that the pressure at each boom is the same.
2.
Verify that all nozzles are of the correct and same orifice size.
3.
Refer to the Calculate the Rate 1 and Rate 2 Cal Values section
on page 8 for the proper method to determine nozzle size.
Check the flow meter cable for breaks and shorts. Refer to the
1.
Testing Flow Meter Cables section on page 44.
Clean, adjust, and check the flow meter parts. Refer to the Flow
2.
Meter Preventative Maintenance and Adjustment section on
page 43.
Replace the flow meter transducer.
3.
Verify that the arrow on the flow meter is pointing in the direction of the
flow. Refer to the Flow Meter Preventative Maintenance and Adjustment
section on page 43 and the Recalibrating the Flow Meter section on
page 45.
Replace the motorized control valve.
Replace the isolation flange assembly and coupler shaft.
1.
Replace the entire motorized control valve if the PC board or
2.
motor is corroded and will not run.
Check the cable for wires with breaks or shorts.
1.
Verify that the cable connections are clean.
2.
Verify that the boom switch and Master switch function properly.
3.
Replace the boom valves.
4.
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