10 Questions
What component de-energizes the PSV torque motor to enable backup hydraulic power?
The REU and MCE de-energize the PSV torque motor.
What does the PSV do when de-energized?
The PSV connects the pump extend and retract control ports to the ram via the MSV and blocks hydraulic system pressure from the EHSV.
How is positional control provided in the electrical backup state?
By comparing the commanded ram position to the actual ram position.
What component demodulates the main ram LVDT signal to determine ram position?
The REU demodulates the main ram LVDT signal.
What does the REU generate based on the position error?
The REU generates an error signal based on the difference between commanded and actual ram position.
What component does the REU command based on the error signal?
The REU applies an electrical command current to the MCE based on the error signal.
What does the MCE command based on the REU input?
The MCE commands the electrical motor driving the pump proportional to the error signal.
How does the pump motor velocity change based on the MCE command?
The pump motor velocity increases proportionally (within limits) to the MCE command current.
What determines which cylinder ports get connected to the pump inlet/outlet?
The polarity of the pump motor command determines which cylinder ports (extend or retract) get connected.
What state provides damping in case of hydraulic/electrical power loss?
The EBHA damped bypass state provides damping in case of hydraulic/electrical power loss.
Test your knowledge about sensors within the manifold and hydraulic pressure sensors. Learn about EHSV position LVDT, compensator position LVDT, retract and extend cylinder pressure sensors, and more.
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