| 摘要 |
<p>Hydraulically operated equipment, e.g., cranes or the like, may be accurately controlled by a remote control coupled by a fiber optic link to hydraulic valve control servo circuitry at the equipment site. Analog input voltage levels representing various functions and/or motor positions are pulse position modulated for transmission through the fiber optic link, and are reconverted into analog signals for controlling selected motors and valve actuating solenoids, Novel safety features are incorporated for stopping and delaying all control if a deadman switch is released or if a function is incorrectly selected, and a standby power pack automatically neutralizes all motors and functions in the event of failure of the main power source.</p> |
