micro-trak MT-3405F II, Справочное руководство

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29
Troubleshooting
(cont)
Checking Console Inputs
If there is no response from any of the following tests, refer
to the main wiring diagram to locate the next connector
in line to ward the con sole and repeat the test at that con-
nec tor. If there is a response at that connector, the problem
may be in the cable between the two connectors (or the
con nec tors themselves).
SPEED INPUT
Turn rotary switch to speed po si tion and dis con nect the
speed sensor (yel low tie) from the main harness. Check
for 12 volts between pins B (white) and C (black) of the
main harness speed cable (yellow tie). Using a clip lead
or other jumper wire (such as a paper clip bent in a “U”),
several times rap id ly short to geth er pins A (red) and C
(black) of the 3-pin connector
(See Illustration 16).
The
console should respond with some speed read ing.
FLOW INPUT
Turn rotary switch to VOLUME/MINUTE and disconnect
the flow sen sor (green tie) from the main harness.
Check for 12 volts be tween pins B (red) and C (orange)
of the main harness flow cable (green tie). Using a clip
lead or other jumper wire (pa per clip bent in a “U”),
several times rapidly short together pins A (brown) and
C (orange) of the 3-pin connector. The con sole should
re spond with some flow rate reading.
REMOTE RUN/HOLD INPUT
Grounding the grey run/hold wire should turn on the
“HOLD” icon on the console’s left display, and display
“HOLD” on the console’s right display. Disconnecting
the grey wire should remove the “HOLD” messages
(console run/hold switch in “RUN”).
FLOWMETER
Shaking the Flowmeter end to end should pro duce a
“rattling” sound (shaft end play). Blowing in the meter from
either end should spin the turbine freely. If the turbine spins
freely but the meter will not register flow with a known
working sensor, the turbine may be defective.
See Flow me-
ter Assembly and clean ing on page 46 and page 60-61 for
details.
SERVO VALVE CONTROL SIGNAL
With the console turned ON, put the console in MANUAL
mode, place the remote Run/Hold switch in the RUN
position and turn at least one boom switch to ON. Using
a voltmeter or simple test light, check from a good frame
ground to each of the servo wires on the main harness
connector. You should get 0 volts on each wire. Holding the
“+” button should cause one wire to pulse toward 12 volts
(light will pulse). Holding the “-” button should cause the
other wire to pulse toward 12 volts (light will pulse).
SERVO VALVE
The best way to test the servo valve is with a known
working console. Turn console ON, put the console in
MANUAL mode, place the remote Run/Hold in the RUN
position, turn the rotary switch to RATE and turn at least
one boom switch to ON. With the servo valve connected
to the servo valve lead on the main harness, holding the
“+” button should close the servo valve and holding the
“-” button should open the servo valve NOTE: assuming
you are in bypass configuration (provided the console has
passed the Servo Valve Control Signal test). The servo valve
should operate smoothly in both directions, from fully open
to fully closed.
You may also use a 12-volt battery or a 9-volt battery.
Connecting the battery to each terminal on the servo
valve should cause the servo valve to run in one direction.
Reversing the battery connections should cause the servo
valve to run the other direction. The servo valve should
operate smoothly in both directions, from fully open to
fully closed.
PLUMBING
Proper plumbing is a very important factor in obtaining
optimal performance from your MT-3405F™ II system. The
chart on the next page will help you determine what area of
the plumbing may be causing your problem. At this point, it
is assumed that your plumbing basically matches that of the
system diagram and that the servo valve and flowmeter are
known to be installed correctly and functioning properly. In
addition, make certain that you have selected and installed
the correct spray tips for the application, speed and spray
rate that you intend to maintain. Don’t forget the obvious
such as leaky fittings and hoses, pinched hoses and plugged
or worn nozzles. If you need more detail than the chart
provides, please refer to Plumbing Guidelines on pages
37-38.
C B A
Illustration 16
Three-Pin Connector