MEGA Corp. MSC-OPS-1 - Manual (Page 15)

MSC/MST-OPS-1
31 Dec 2013
SECTION 2
System Description
2-6
The joystick box functions operate as follows:
BASIC SYSTEM THEORY OF OPERATION
Spray system power is provided by chassis 12/24 volt
DC power. Power is routed to cab controllers and
logic control panels by turning on the switched
power via the ignition key switch.
When the chassis ignition switch is turned ON, the
master switch box will undergo a functional self-test.
During this process, ALL LEDs will first turn ON, then
off. While this is occurring, the water level indicator
lights will initially register a FULL tank, and will then
decrease down to EMPTY. The EMPTY light will blink,
and then the water level indicator will count up to
register the current water level of the tank.
Cab control power is then activated by turning the
cab control POWER switch ON while logic controllers
are switched on when the chassis ignition switch is
turned ON.
The spray system will function normally when cab
control power is applied (cab control POWER switch
ON) and sufficient water level (water level EMPTY
light not flashing) is present. Activation of a specific
function is accomplished by depressing the selected
function switch on the master switch box or joystick
box.
Depressing the switch sends a signal to the logic
control panel in the solenoid box to activate a given
function. The logic control then receives the signal
and provides an output command to the given coil or
function.
Once the logic control panel output is processed, the
logic control sends a feedback signal back to the cab
control box to illuminate the LED on the selected
function switch. If the switch LED does not illuminate,
a malfunction may exist in the logic control, wiring
harness or cab control box.
If a function switch is depressed with no
corresponding switch LED, check to ensure system
power switch is ON and the water level empty LED is
not flashing. If the switch LED is not illuminated, a
malfunction may exist.
If the selected function switch LED illuminates and
the component on the water tanker is not
functioning, the component (water-way valve, spray
head or water cannon) may have malfunctioned.
As functions are turned on and off, the water pump
switch will remain illuminated unless all spray system
functions (water-way valves, spray heads or water
cannon) are turned off. The logic control will
automatically turn the water pump off if all valves are
closed to prevent over-temp of the water pump
volute case. As the water level of the tank drops and
the EMPTY LED begins to flash, the logic controls will
deactivate the water pump to prevent cavitation or
dry running of the water pump.
HOSE Controls activation of hose reel func-
tion ONLY.
SUCTION LOAD Controls activation of suction load
station ONLY.
LT VSS Opens or closes left vertical side
spray head.
DRAIN Opens or closes tank drain BFV.
DUMP BAR Opens or closes dump bar BFV.
RT VSS Opens or closes right vertical side
spray head.
LT REAR Opens or closes left rear spray head.
LT CENTER Opens or closes left center rear spray
head.
RT CENTER Opens or closes right center rear
spray head.
RT REAR Opens or closes right rear spray
head.
Control Function
Joystick
(LEFT-RIGHT-UP-
DOWN) Sends command signals to the
hydraulic control valve assembly to
move the water cannon.
FOAM Open or closes the foam concentrate
tank in-line control valve.
NOZZLE Adjusts water cannon nozzle from
FOG to STREAM.
BFV Opens or closes the water cannon
butterfly valve.
Control Function