SharpShooter
®
with Rate Sync
®
- Turf Sprayer Edition
©2003, 2011, 2015 Capstan Ag Systems, Inc., All Rights Reserved | Version:
P-3.0
| 6/9/2016
9.0 - Troubleshooting
55
If the actual flow does not come close to the calculated flow, then either the flow meter calibration is incorrect, or the
flow meter is failing and needs to be replaced.
Recheck for the meter calibration number as noted on the flow
meter.
Flow Control Valve and Rate Controller:
1.
For a centrifugal pump: With the engine off and rate controller ON and in MANUAL Mode, toggle the manual INC/
DEC switch.
2.
Disconnect the flow control valve harness from the rate controller harness.
3.
A rate controller may work in MANUAL Mode, but not under load in the AUTOMATIC Mode. Using a test speed,
set the sprayer up to begin spraying. In the AUTOMATIC Mode toggle the INC/DEC switch. Tap into the signal
wire and again measure voltage to the control valve. If inadequate voltage, repair or replace the rate controller.
4.
For PWM driven diaphragm pump:
9.3.5 - Wet Test Pressure Control
This test evaluates the pressure side control of the SharpShooter with Rate Sync system with the flow control held
constant.
Perform the following steps:
1.
If not already, power up the SSRS Display and put in the AUTO Mode at 40 PSI.
2.
If not already, power up the rate controller and put in the MANUAL Mode. This locks for flow control to a constant
position.
3.
Set a test speed of 4.0 MPH, turn on the pump and section switches. Toggle the master switch to initiate boom
spraying. Using the INC/DEC switch adjust the rate to some acceptable value. Allow the sprayer to get to rate and
pressure. The SharpShooter with Rate Sync system should be pulsing. Note the SSRS Display duty cycle reading.
c.
If the sprayer rate is unstable at the low ends of the rate, speed and pressure ranges, AND/OR it can not
achieve normal maximum rate, speed or pressure, the issue is possibly a worn or damaged pump impeller
or bearings.
a. Note if you can see or hear the flow control valve respond, then at least a voltage signal is getting to the
valve from the rate controller.
a.
Using a Volt Meter, this test should yield a +12/-12 volt reading. If the voltage is not correct, the INC/DEC switch, Raven
harness and connections should be evaluated. If no defect is found, then the rate controller itself needs to be repaired.
a. With the rate controller in the MANUAL Mode check the harness to the PWM valve for a 0 to 12V signal. If no
voltage occurs, check rate controller harness, and connectors for issues. Ultimately it could be an issue with
the rate controller.
b. With the rate controller in AUTOMATIC Mode with a test speed and spraying, toggle the INC/DEC switch.
Observe the pump shaft for related change in RPM. If shaft doesn't spin, then the issue is likely with the rate
controller. If the shaft spins, but doesn't change in rpm with the INC/DEC, the issue could be either the PWM
valve or the rate controller.
