FIGURE 1 shows part of a control system used to maintain the water level in a…

FIGURE 1 shows part of a control system used to maintain the water level in a

sump between the levels high and low. Two transducers (HIGH and LOW) are

used to monitor the level. The water is pumped out by two pumps, P1 and P2.

The water level in the sump is to be controlled as follows:

? If the level reaches high one pump will start to pump out.

? If the level does not reach low within about 30 seconds, the second pump

will come into action. If the level does reach low before 30 second

pumping should stop.

? If the level does not reach low within about 30 seconds of the second

pump starting, an alarm is given. The alarm is sounded until the level

reaches low. If the level does reach low before 30 seconds the pumping

should stop.

? The pumps will stop when low is detected.

? To give even loading of the pumps they are to be used alternately, e.g. if

on one pump cycle P1 starts first and P2 is the ‘back up’ then on the next

cycle P2 will start first and P1 is the ‘back up’.

 

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