![]() ![]() ![]() Then your pressure switches have a logic block that simply triggers a Lead, then a Lag if the Lead pump can't keep up, and whichever is not being used as Lead or Lag is left as Standby. Each pump control circuit has logic for it to operate as the Lead pump, or the Lag pump, or the Standby. With all three pumps in operating condition, your triplex logic is "Lead-Lag-Standby". But if you want to implement it in PLC logic, it's easy once you break it down to this: It's not "rocket science", this has been implemented in relay logic for decades and there are now standardized triplexing alternator relays that do this. What you are describing is an industry standard called a "Triplex pumping system".
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