Hydraulic Control Panel Flashcards

1
Q

SYSTEM HYDRAULIC PUMP LOW PRESSURE lights

A
  • indicates low pump output pressure from ENG 1 or ELEC 2 pump
  • ENG LOW PRESSURE lights inhibited with fire handle pulled
    fluid flow to the associated engine driven pump is shut off
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2
Q

ENGINE DRIVEN PUMP switches

A

ON

  • the depressurization solenoid valve is not energized; this allows pump pressure to enter the hydraulic system
  • normally keep this switch in the ON position to prolong solenoid life
  • loss of normal electrical power to the control circuit does not affect the output of the pumps

OFF

  • energizes the depressurization valve to block pump output
  • re-routes hydraulic fluid to the case drain line and back to the reservoir
  • this does not stop the rotation of the pump or the internal pressure in the pump
  • the pump continues to be lubricated
  • not so if you pull the fire handle which closes the EDP supply SOV to block fluid flow to the pump - there is no case drain fluid in this condition
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3
Q

ELECTRIC MOTOR PUMP switches

A

ON

- provides electrical power to corresponding electric motor driven pump

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4
Q

Electric Driven Motor Pump Overheat lights

A
  • hydraulic fluid is used to cool and lubricate the corresponding EMDP
  • a temperature switch in the case drain line downstream of the pump monitors the EMDP case drain fluid for overheat
  • the OVERHEAT light illuminates when the case drain fluid temp increases to more than normal (> 225F)
  • there is also a temperature switch in the EMDP motor that will cause the OVERHEAT light to illuminate if the motor reaches a temperature more than normal
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