Automatic input control circuit of water pump equipment

Factory cooling water pump rooms are often equipped with multiple water pumps, and one of them is used as a backup station (standby water pump). When a pump is shut down due to failure during operation, the backup unit is required to be automatically put into operation, and the number of pumps to be started is determined based on water consumption. The numbers of the operating unit and the backup unit are not fixed, and they can be used regularly or irregularly during normal operation. Switch to the standby station. As shown in the figure, in addition to meeting the above requirements, each water pump can retreat freely and participate in the "automatic input of standby" combination without affecting the original working status of other water pumps.