27
All MT-NH3
TM
II consoles, flowmeters and servo valves are
tested prior to packaging, so unless there has been damage
in shipment you can be confident that everything will be
operational when you receive it.
However, if you do encounter a problem that appears to
be related to equipment failure,
PLEASE DO NOT OPEN
THE CONSOLE.
Your system is protected by a warranty, and
Micro-Trak will gladly correct any defect.
Many problems are the result of mistakes in installation
or operation. Before returning any parts for service,
carefully check your installation and review the operating
instructions. For easy-to-follow guidelines, refer to the
troubleshooting section which follows.
WARNING: THE NURSE TANK SHOULD NOT BE
CONNECTED TO THE SYSTEM DURING THESE
PROCEDURES
.
ELECTRIC SHUT-OFF DOES NOT OPERATE
With console ON, check for constant power (12 VDC)
between pins “K” and “B” of the main harness 10-pin
connector.
Check for power between pins “K” and “J” of the main
harness 10-pin connector when Run/Hold Switch is in Run
position. If pin “B” has constant power, and pin “J” has
power when Run/Hold Switch is in Run position, shut-off
valve may be defective.
NO FLOW-RELATED READINGS
No readout of pounds (kg) of “N”, or pounds (kg) of “N” per minute
Check to see that the tool bar and nurse tank plumbing is
operating properly. Also check the flow sensor to be sure it
is screwed all the way into the flowmeter.
Check to see that a FLOW CAL number has been entered
in calibration of the console. Also check cable for breaks or
incomplete connection.
To test the flow sensor, unscrew flow sensor from
flowmeter. Using a Micro-Trak magnet, pass the magnet
by the tip of sensor alternating side of the magnet each
pass. If the console accumulates pounds (kgs) gallons, the
flowmeter turbine could be stalled. Stalls may occur due
to foreign material in flowmeter. Disassemble and clean
flowmeter. If console does not respond, unplug 10-pin
connector and several times rapidly short together pins “A”
and “C” on the main harness. If console responds to shorting
but not to magnet, sensor is defective. If console does not
respond to shorting, main harness may be defective.
CONSOLE APPEARS DEAD
Using your test light, check for 12 volts at the power source.
Also check for damaged power cable or reversed terminals.
Check for 12v between pins A and C of the 3-pin connector
coming out of the top of the master switch box. The switch
should be in the center position.
(Console requires 12 volts
for proper operation).
SPEED IS ALWAYS ZERO OR ERRATIC
Check for properly calibrated wheel circumference.
Review speed sensor installation. Check for proper
mounting, alignment and spacing of speed sensor in
relationship to magnet assembly. Make sure magnet
polarities are alternated. Also check cable for breaks or
incomplete connection.
For more suggestions on solutions to speed problems, see
Hall-effect inputs and console inputs on pages 28-29.
AREA COUNT IS INACCURATE
Implement width or wheel circumference was measured
incorrectly or programmed incorrectly. Go back through
the original procedures, make changes, and test for acre
(hectare) count again. Verify accuracy with formula:
Acres= Distance x Width in feet/43560
DISTANCE COUNT IS INACCURATE
Wheel circumference was incorrectly measured or entered.
Review calibration, readjust and test.
TOTAL NH3 USED IS INACCURATE
This may result from an incorrectly-entered “FLOW CAL”
value. Check the number stamped on the flowmeter tag,
and be sure this is entered in the console’s “FLOW CAL”
position. If the meter has been used for some time, wear
may have changed the Flow Cal value.
See Fine-Tuning
Flowmeter Calibration on page 34.
Check to see that the flow sensor is screwed all the way
into the flowmeter. The console displays total actual NH3
used. Scale tickets typically also read NH3.
Other causes may be inaccurate tank gauges, a flow rate
too low to register, or foreign material lodged in the
flowmeter.
CONSOLE IS ERRATIC IN OPERATION
If you have a two-way radio, it may be mounted too close
to the console. Keep all MT-NH3
TM
II cables away from the
radio, antenna, and power cable.
Ignition wires may be causing the console to malfunction.
Keep MT-NH3
TM
II cables away from ignition wires, or install
a noise suppressor.
Reroute all cable away from electric solenoids, air
conditioning clutches and similar equipment.
DISPLAYED MEASUREMENTS DO NOT MAKE SENSE
The console may be in the incorrect measurement mode
(English or metric).
See page 16 for instructions.
DISPLAY READS “OFL”
DISTANCE, AREA, and TOTAL NH3 will read OFL when they
have exceeded their maximum count. Reset to zero to
resume counting.
Troubleshooting
(cont)
General
