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what is difference b/w the solinoid volve and autodrain?
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Answer Posted / priyank sharma neb alwar rajas
solenoid is a electropneumatic device which flow the air
according to coil charge & discharge command. that coil may
be 24 vDC or 230 VAC.
autodrain is the elctROMECHANIC DEVICE which is the
combination of solenoid valve & control card.in that
solenoid passes the water at the coil charging command.it
uses in air receivers for drain the water.
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model question paper of instrumentation for Jindal GET 2010.plz reply sudhanshukumar08@yahoo.com
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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