1C31181G04 Emerson Programmable controller

1C31181G04 Emerson Programmable controller

Brand：Emerson                                   Model number：1C31181G04 

Country of origin: United States          Product weight：  1.42kg

HS code：8517623990

Product Dimensions：

In a typical scenario, the user would determine the voltage required to null the servo spool; 

i.e., overcome the mechanical bias adjustment. Let,s assume the value is –200 mV. The 

user would then set exitSeatVal to –200 mV plus an arbitrary amount in the direction of 

valve closure, 100 mV perhaps. So, the user would set exitSeatVal to –100 mV. Also, 

assume the user leaves the other associated constants to their default values. When 

seating is entered, the servo output goes to +10 volts and will remain there for at least 10 

seconds. When the 10 second timer expires, and when position feedback is within 2 

percent of the target position (probably 0), the servo output ramps from 10 volts to –100 mV 

at 10% per second. Ten volts is about 50% of output range, so the servo output would return 

to –100 mV after 5 seconds. At –100 mV, the servo spool is letting a small amount of fluid 

escape, thus closing the valve.

If the target position went higher, thus removing the RSR from seating, the servo output 

would be readily available to begin to move the valve, and would not rely on integral action 

to bring it from 10 volts back to 0.

When the RSR is moving between these various modes, the PI tracks the output when it is 

begin driven by one of the non-normal modes such as seating. Therefore, the transition 

back to normal operation is bumpless.

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