The series QPC is used where four pumps are required to alternate to provide equal run time on each. Alternating loads allows for equal wear on all pumps, lengthening their operation life. The series QPC has five inputs allowing the four outputs to operate properly even if one of the inputs fails to open or close. Four LED indicators show the load that is energised by the SPST output contacts.
The QPC is available in two sequence configurations: sequence-on-simultaneous-off (SOSO) and first-on-first-off (FOFO). In either sequence, the lead load position is advanced to equalise run time on each pump. An inrush delay on both models reduces line sags by preventing multiple loads from energising simultaneously.
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