proportional band sentence in Hindi
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- While the gain is useful in mathematical treatments, the proportional band is often used in practical situations.
- The width of this range, in units of the error variable and therefore of the PV, is called the " proportional band " ( PB ).
- "Tuning " a control loop is the adjustment of its control parameters ( proportional band / gain, integral gain / reset, derivative gain / rate ) to the optimum values for the desired control response.
- So if K _ p, the Proportional Gain, is very high, the Proportional Band is very small, which means that the Band of Controller Output, over which the final Control Element, like a Control Valve, will go from minimum to maximum ( or vice versa ) is very small.
- In the example of the furnace above working at various temperatures, if the heat being applied does not bring the furnace up to setpoint, for whatever reason, integral action increasingly " moves " the proportional band relative to the setpoint until the PV error is reduced to zero and the setpoint is achieved.
- As the temperature approaches, say 30?below SP ( 60?proportional band ( PB ) ), the heat input begins to be reduced, the rate of heating of the furnace has time to slow and, as the heat is still further reduced, it eventually is brought up to set point, just as 50 % power input is reached and the furnace is operating as required.
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