Answer / rt langley

Interlock could be to protect equipment or personal. Boiler
loose water flow interlock shuts down boiler to prevent
damage. Flame eye in boiler loose signal interlock shuts off
gas to prevent explosion. Photo eye beam is broken garage
door returns to open position to keep from crushing you.

Answer / hansdas b.jaiswal

The system is design for the safty of personal and
protection of equipment during operation and maintenance.

any thing about plcs?

4 Answers  

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Absolute pressure is 700psi,what will be the gauge pressure?

1 Answers   IFFCO,

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how we calculate error in percentage when instrument calibrat

1 Answers  

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why we are using perforted cable tray for control cable and ladder tray for power cable

1 Answers  

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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.

0 Answers   MNC,

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how to commission furnace ( water heater)

0 Answers   Petrofac,

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T.x range -0.1 to 0.2 milibar,so how much mili ampear at 0.1 milibar?

7 Answers   Sugar Factory,

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Any body have know try work calculation ???

0 Answers  

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what is the differnt between open loop and close loop ?

5 Answers   India Cements,

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i want use pressure transmitter for flow ,how?

5 Answers   Gasco,

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why we use 24v dc in instrument rahter than 230vac????

4 Answers  

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Difference between dcs and plc including date processing and architecture.

0 Answers  

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