If the hydraulic proportional valve receives a 4-20 mA current loop signal to control the hydraulic cylinder that extends or retracts to set the position of the blade pitch between 0 and 90 degrees, what is the value of the electrical signal needs to be sent to the proportional valve to set the cylinder rod to extend to 75% so the blade pitch is set at 67.5 degrees?
What will be an ideal response?
The range of 4-20 mA is 16 mA.
16 mA/90 degrees = 0.178 mA/degree + 4 mA offset (0.178 mA x 67.5 degrees + 4 mA) = 16 mA.
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