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MODEL 44-50
VIBRATORY
DRIVER/EXTRACTOR
VI.
ELECTRICAL CIRCUITRY
C. SAFETY CONTROL SYSTEM
The heart of the safety system is the shutdown reset, which is normally closed, thereby
providing current to operate the HOUR METER and to energize the FUEL SOLENOID.
Energizing the fuel solenoid opens the injector pump and allows fuel to flow to the diesel
engine. The shutdown reset must remain closed so that fuel continues to flow to the diesel
engine.
If the coil in the shutdown reset is energized, the shutdown reset will open, shutting off the
fuel to the diesel engine. The engine will stop. The coil may be energized by either of the
following devices:
1. ENGINE OIL PRESSURE GAGE - If oil pressure is below 15 PSI, contacts in the gage
will be closed providing current to energize the shutdown reset coil. On start-up, the
reset button of the shutdown reset (on the control panel) must be held in until oil pressure
exceeds 30 PSI.
2. ENGINE WATER TEMPERATURE GAGE - If water temperature exceeds 210°F(99°C),
the contacts of the gage will close energizing the shutdown reset coil.
3. Pushing the EMERGENCY STOP BUTTON on Control Pendent energizes the shutdown
reset coil.
4. Return Filter Switch - if the hydraulic return filter is clogged, the return filter switch
(PS3) will close energizing the shutdown reset and turning on the indicator light. The
Return Filter Shutdown is disabled if the Temperature Switch Contacts (TS1) are opened
by oil temperature less than 100°F(38°C).
5. Hydraulic Level Float Switch - If the hydraulic fluid level drops below the float switch
(about 30 gallons), the contacts of the switch will close energizing the shutdown reset
coil. This also will turn on the HYDRAULIC FLUID LEVEL LOW light.
6. Hydraulic Oil temperature Gage -if the temperature of the hydraulic oil exceeds
160°F(71°C), the hydraulic oil temperature gage switch will close, energizing the
shutdown reset coil. This will also turn on the indicator light.
A system of safety controls shut off the fuel supply, which stops
the diesel engine in the event that engine water temperature is
too high or engine oil pressure is too low.
VI-2
OPERATING
INSTRUCTIONS
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