Water pump control. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Electrician

Water pump control. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Electrician's Handbook

It is used in summer cottages and in disadvantaged private sectors, when filling a tank with water using a pump, it is very convenient to assemble an automation circuit.

Water pump control
Fig. 1

The circuit consists of a 220/12 volt step-down transformer, a rectifier bridge made of D226B diodes, three contactors with a 12 volt coil, and three water levels.

Yiwu - the upper water level at which the pump is switched off.

SU - medium level, the pump is in operation, water fills the tank.

WELL - lower level, the pump continues to fill the tank, but the water flow is faster than the inflow, it is necessary to reduce the water flow and check the pump's serviceability.

In the control of contactors, it is applied safe voltage 12 volts.

After rectifying the voltage, minus serve on the body of a metal tank.

If the tank is made of another material, we lower a metal strip or profile along the inner wall with a cross section of at least 100 mm2

positive potential connect to contacts A1, contactor coils K1 (VU), K2 (SU) and K3 (WELL)

Second contact A2, connect to water level sensors.

Water level sensor made of flexible copper wire with a cross section of at least 6 mm2 with waterproof insulation (for example KG), at the end of which we attach a metal plate.

Sensors are installed at three water levels.

Upwhere it is necessary to stop filling the tank.

Bottom, to turn off the pump in case of water leakage from the tank or failure of the electric pump.

Average, is set below half the volume of the tank, to trigger an alarm at high water flow and low inflow, possibly due to damage to the pump.

Water pump control
Fig. 2

Consider a 220 volt pump control circuit using 12 volt sensors.

So our water tank is empty, the circuits are assembled correctly, the sensors are installed.

Push the button START, the pump turns on, the water fills up, you have to hold it for a while until the water reaches the lower level

Set the lower sensor to about 10 parts of the tank volume

Upon reaching the lower level, the pump will turn on, the light and sound alarms will turn on, the start button can be released.

Will work contactor K3, will close its open contact K3 and chain contactor K6, which in turn closes its contact K6 shunting the START button will turn on the pump.

You will have to wait a bit for the alarm to work until the water is filled to an average level.

Set the middle sensor to about 30 parts of the container volume.

When the tank is filled to an average level, the alarm is turned off, the pump continues to work, the indicator light for the average water level is on.

Turns on contactor K2, closes open contact K2, chain contactor K5, opens closed contact K2 chain contactor K6 and alarms.

Contactor K5 will close his contact K5, the pump continues to fill the container.

The tank will be filled to the upper level, set at 90 parts of the volume, after which the pump will turn off, indicating by a light alarm that the tank is full.

Turns on contactor K1, closes open contact K1, chain contactor K4, opens closed contact K1, chain contactor K5 the pump has turned off

Included contactor K4 opens closed contact K4, chain contactor K6, to prevent low level activation and alarm.

Publication: electro.narod.ru

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