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Answer Posted / carl_ellis
Burn-out is a fail-safe setting, normally associated with
control equipment, but also used on monitoring devices like
recorders to indicate the loss of a valid input signal. For
controllers, burn-out drives the calculated output to a
condition that is considered safe for the process, typically
to a state where energy is not put into the process.
Burn-out is configured to go up scale (full scale), or down
scale (full scale).
For control purposes, when a signal that is a process
variable in a control loop goes full upscale, the
controller's output will drop to zero in a reverse action
controller.
Similarly, when a signal goes full scale down scale, a
controller's output will drop to zero in a direct action
controller.
Carl Ellis
Measure First
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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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