Duplex & Triplex Pump Control Logic
Lead/lag alternation and simultaneous operation logic that balances wear and handles peak flow.
Lead/lag alternation automatically rotates which pump runs first on each cycle, distributing wear evenly across multiple pumps rather than running one unit continuously while a backup sits idle.
A high-level condition typically triggers simultaneous operation of both (or all) pumps to handle peak inflow that a single unit can't keep up with alone.
Pump run-time totalizers, tracked per unit, are the simplest tool for confirming alternation logic is actually working as intended rather than assuming it from the control panel design.
A station where one pump consistently shows dramatically higher run hours than its alternating partner usually indicates a failed alternation relay or logic fault, not just uneven flow distribution.
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