MODEL 66-80 VIBRATORY DRIVER/EXTRACTOR
VI. ELECTRICAL CIRCUITRY
C. SAFETY CONTROL SYSTEM (CONTINUED)
4. Return Filter Switch - if the hydraulic return filter is clogged, the return filter
switch (PS3) will close energizing the timing delay coil (TD,C) and turning on
the indicator light (L4). The Return Filter Shutdown is disabled if Temperature
Switch Contacts (TS1) are opened by oil temperature less than 100°F (38°C).
5. Hydraulic Oil Level Switch - if the hydraulic oil level is low, the hydraulic oil
switch will close energizing the timing delay coil (TD,C) and turning on
indicator light (L5).
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 timing delay coil (TD,C) and turning on indicator (L6).
A diode (D1-D6) on each malfunction switch limits the flow of direct current to
prevent multiple lights coming on. Another diode (D8) prevents arcing in the
malfunction switches.
Emergency Stop - When the diesel engine is running, pressing the EMERGENCY
STOP button on the pendant, energize the coil on the SHUTDOWN RESET. The
Shutdown Reset opens and the engine and vibrator are stopped.
D. CLOSING HYDRAULIC CLAMP
With the diesel engine running, turning the clamp switch (OPEN-CLOSE) on the
control pendant to CLOSE energizes the close-clamp solenoid (CLOSE-SOL.).
This operates the clamp control hydraulic valve and closes the clamp.
When the pressure in the close-clamp hydraulic circuit reaches 5500 PSI (379
Bar), the pressure switch (PS1) opens and de-energizes the CLOSE-CLAMP
solenoid and turns on the CLAMP LIGHTS on the control pendant and control
panel. If close-clamp pressure falls below 5000 PSI (345 Bar), the pressure switch
closes and re-energizes the close-clamp solenoid to rebuild pressure. The
CLAMP LIGHTS go out. When pressure returns to 5500 PSI (379 Bar), the
pressure switch opens de-energizing the close-clamp solenoid and turns on the
CLAMP LIGHTS.
E. OPENING HYDRAULIC CLAMP
With the diesel engine running, turning the clamp switch (OPEN-CLOSE) to OPEN
energizes the open-clamp solenoid (OPEN SOL.). The clamp opens. Normally
Closed Contacts (R1C) in the Start Relay (R1), prevent the operator from opening
the clamp while the vibrator is running.
VI-2
