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if found error in magnetic flow meter?how can we adjust?
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Answer Posted / kumaran
1.The magnetic flow meter should not shows the error if it is properly grounded and properly terminated with transmitter.
2.Always the installation should be made like valves before and after the sensors. while showing error in the meter, you should close the downstream and upstream valves to check the zero. If it is shows zero then there is no error in the zero point.
3.Check the span error by weihging the flow. the sensor output pipeline should be connected to the tank and measure the tank area, fill the tank and check the span between tank capacity and the flow rate.
4.make sure that the observing coils inside the sensors are clean. else try to clean the same.
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A PLC is programmed to drive three motors A, B and C as follows : After running motor A for an hour, motor B should get ON and motor A should get OFF. And after running motor B for an hour, motor C should get ON and motor B should get OFF. And after running motor C for an hour, motor A should get ON and motor C should get OFF. (That is, a cyclic repetition with time period one hour) Now, the second condition is: If any motor gone faulty and is tripped, the consecutive motor should get ON and the faulty (tripped) motor should be eliminated from cyclic repetition. The remaining two motors should bear the cyclic repetition of one hour each. (For healthy motor take logic as high and for tripped motor take logic as low) Now, the third condition is: When motor A load(Amps) exceeds 60% of its rated load, motor B should get ON in parallel to motor A. And when both motors A & B are running in parallel, and if their load exceeds 60% of their rated load, motor C should also start in parallel to A & B. [Here the cyclic repetition is eliminated, until their loads become normal(40%)] [Take logic high(1) for load at 60% and logic low(0) for load at 40%] Now draw a flow chart or a ladder diagram to fulfill the above condition.
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