PUMP SEQUENCE CONTROL RELAY

Float or Pressure switches are connected to pins 1, 11, 6 and common on 5. When the first switch closes, relay 1 energizes. When the second and third switch closes, the second and third relay energizes. There will always be as many relays energized as there is a input switches closed. When 1, 2 or 3 pressure switches open, 1, 2 or 3 relays will de-energize. The positions of the pressure switches do not matter, only how many are switched on at a time. When all switches open and no relays are energized, and a switch closes again, then relay 2 will be primary relay, that is the first relay to energize, then relay 3, and then relay 4 or 1. Every time the first switch closes, the next relay will be the first to energize. The currently selected primary relay is stored in non-volatile memory. The relay will remember which relay to energize first, even if the supply is disconnected.