Spray Controller Troubleshooting
Contents
1. fluctuations may be normal for 2 5 seconds only when changing speed or rates fluctuates more than 2 Check SPEED readout is stable at a constant driving speed Check all calibrations are set correctly Check if flow sensor is giving a stable pulse rate as follows Activate section controls With pump running and stationary enter the flush mode Adjust the flow in L MIN using the up and down arrows to set a small rate such as 20L MIN Place a container under the section to capture spray Start timing for a minute After a minute measure the volume of liquid it should be 20L If not the flow sensor is either faulty or requires cleaning Check the nozzle manufacturers spray chart to see if the rate selected is compatible with the nozzles and driving speed If nozzles are too large for the intended rate and speed then the proportional valve will hunt for the right setting Increase rates or get the right nozzles for the job If SPEED and L MIN RATE fluctuating follow section flow sensor service procedure Fluctuation could be caused by a faulty pressure relief valve that dumps pressure prematurely this will cause a continuous self defeating response from the spray controller as it tries to compensate Water hammer could be the reason Check if air is entering the system 12 Rate low alarm Indicates target rate selected is not achievable or can t reach maximum speed Check2. menu Disconnect wheel sensor from cable and use a short length of wire to short circuit across connector plug to wheel sensor cable black amp white wires Controller in cab should beep continuously whilst wires are short circuited Now wriggle all connections from wheel sensor plug back to controller to try and make beep sound fail thereby isolating cause of fault If wiring and controller can not be faulted replace sensor If no audible response in TEST WHEEL menu from shorting out wiring at wheel sensor connection short out the relevant pins in the Deutsche breakaway L amp P pins at the breakaway for the Primo 400 A amp Q pins for the 24V1 If no audible response problem is in the sprayer loom If no audible response problem is in the tractor loom or controller 7 Wheel sensor test procedure USE A MULTIMETER ONLY TO TEST THE WHEEL SENSOR Disconnect wheel sensor from cable Switch Multimeter ON and select OHMS scale Touch test probes together and meter needle should read zero 0 Q resistance Connect test probes to wheel sensor pins If meter goes immediately to zero without magnet then sensor is short circuit faulty If meter stays to left of scale hold wheel magnet in front of sensor meter should go straight to zero If meter fails to change then sensor is open circuit faulty 8 Total and Trip area incorrect Check SPEED readout is correct and steady if not this will af
3. min 600 FARMSCAN
4. FARMSCAN December 2002 Spray Controller Troubleshooting Problem Cause Remedy 1 Controller does not turn on Fuse on loom has blown Internal poly fuses have blown Disconnect controller from power and wait After poly fuses reset connect power again and turn on If not repeat and wait longer Check that connections to battery are clean and tight Try again with the engine running Disconnect controller s power cable and test voltage is 12 13 8V DC from battery Reconnect power to the controller and check that there is 12V between power wires Check that red wire is to positive and black wire is to negative Connect controller direct to another 12 Volt battery known to be in good condition 2 LCD display drops out If display rectifies when engine running this indicates battery is in poor condition or connections to battery are poor If problem persists when engine running then voltage supply is low or low current is a problem due to poor connections at battery or corroded inline fuse holder on loom Clean battery terminals and power cable connections Connect controller directly to an independent battery to prove if controller is OK Disconnect proportional control valve if problem goes away then this confirms insufficient current available from power cable 3 Controller looses calibration values Controller not connected directly to battery Connect black from loom directly to negative and red to p
5. fect the area totals Recheck WIDTH calibration is set correctly in metres 9 Total and trip area won t record Check that SPEED readout is working At least one section valve must be switched on Flow sensor must be working OK Check that L MIN or G MIN is working FARMSCAN FARMSCAN December 2002 Problem Cause Remedy 10 Rate readout a Check SPEED readout stays at zero b Use a multimeter to check for 12 volts between red and black wires on loom to flow sensor Check for 12 volts at the relevant pins of the breakaway plug on the tractor loom O amp P at breakaway for the Primo 400 A amp B pins for the 24V1 Flow sensor wiring Primo 400 24V1 Description Brown Red Red 12 V White Black Black Ground Green White Black Grey Signal c Enter TEST FLOW menu d Disconnect flow sensor plug and use a short length of wire or long nose pliers to short out between the pins corresponding to the white and green wires of the flow sensor connector plug feeding back into the loom e Acontinuous beep should be heard from the spray controller Now wriggle all wiring and connections from flow sensor plug to rear of spray controller and listen if the beep can be made to drop out f If no beep heard then repeat test by shorting out the relevant pins at the Deutsch breakaway If no audible response then controller or tractor loom may have fault 11 Rate readout Big
6. manufacturer s spray chart to see what rates should be achievable at maximum pressure Check inline filters and nozzle filters which may be blocked causing restriction to achievable flow rates Check flow sensor inlet for debris causing restriction FARMSCAN FARMSCAN December 2002 Problem Cause Remedy 13 Flow sensor Make sure flow direction arrow points in direction of flow inaccurate If no diaphragm or piston pump make sure pump is not hammering Remove flow sensor and chek inlet strainer on flow sensor is clear Follow flow sensor calibration and make sure correct flow cal factor is set Follow FLOW SENSOR SERVICING PROCEDURE 14 Control valve 1 Check WIDTH calibration factor is correctly entered and make sure boom control switches won t open are activating sections automatically 2 Check FLOW cal factor is set 3 Check WHEEL cal factor is set 4 Check rates are set Check 25 way connector at rear of spray controller is inserted properly and check implement breakaway connection making sure pins on male side are contacting properly Check ground speed readout is working correctly If no pressure make sure pump is working correctly 15 Valve keeps Check speed readout is working accurately opening while spraying Check flow sensor operation Read nozzle manufacturer s spray chart and make sure the intended rate can be delivered at the speed required within the minimum recom
7. mended operating pressure 16 Valve response If switching spray OFF regularly you must use MASTER section control to instantly start too slow to start stop spray spraying You must switch OFF master switch whilst still travelling at working speeds If you shut OFF too late the valve will have opened to bypass If centrifugal pump when shutdown pump must be able to cycle some material back to tank otherwise cavitation may cause loss of pressure If wheel cal figure is greater than 2 metres then additional magnets may be required to improve response at slow working speeds 17 Rate high alarm Check proportional valve operation activates for more than 2 3 Check that you are not operating within the slow hold parameters seconds 18 Pressure too Check all calibration factors are correctly entered low under auto control Make sure significant pressures available Run sprayer and check hoses for split after proportional control valve Make certain nozzles are correct for the job FARMSCAN FARMSCAN December 2002 Summary of Alarms RATE TOO HIGH Speed too slow to control to rate set RATE TOO LOW Speed too fast to control to rate set UNIT ON HOLD Monitor stopped accumulating data and product is returned to back to the tank UNIT OFF HOLD Monitor is returned to the normal spray mode Flow Rate Calculation MAX L Ha x kph x WIDTH m L min 600 eg _1500 x 8 x 4 80 L
8. ositive side of battery Do not share power with any other devices such as foam markers using the controller loom 4 Speed readout too fast or too slow Incorrect wheel calibration factor Repeat wheel calibration procedure 5 Speed readout jumpy Make sure magnet is facing sensor correctly as shown in Wheel Sensor Installation Use of an alternative magnet may cause problems due to wrong orientation of magnet Check that wheel magnet is present and the magnet is 10 15 mm away from wheel sensor as they pass Magnet too close can cause jumpy speed If the readout is jumpy it indicates that the pulses from the wheel sensor are inconsistent Check for poor or intermittent connections to sensor Check sensor cable for physical damage making sure cable has not rubbed through to the chassis due to sharp edges If fault can not be found enter TEST WHEEL menu Drive slowly forward and listen to the beeps The sound should be rhythmic at a fixed speed If the sound is jumpy and wiring is OK then replace sensor FARMSCAN FARMSCAN December 2002 Problem Cause Remedy 6 Speed readout intermittent or stays at zero a b Fault is probably a broken or intermittent connection to wheel sensor or perhaps a faulty sensor Check all connections first Make sure clearance between wheel magnet and wheel sensor is 15 20 mm Check for the correct sensor it should be black Enter TEST WHEEL
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