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Water pump motor anti-rundown protection circuit
Source: InternetPublisher:toothache Keywords: Motor protection circuit photocoupler Updated: 2021/09/30
If the water pump drains the water from the well and the water pump is still
running, it will not only waste electricity, but also may burn the motor
. The circuit in Figure 5-17 can avoid this situation.
The circuit uses TWH8778 power switch integrated circuit A
and photocoupler B as control components . When the water in the well
is drained, A is cut off, the triac V is
closed, the relay KA is released, and the water pump stops running.
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