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All about Motors
Duplex pump control |
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| Fully automatic control for two pumps |
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Starting sequence of pumps 1 and 2 can be selected by control switch S12
Control circuit wiring with two float switches for basic and peak loads (operation is also possible with two pressure switches)
P1 Auto= Pump 1 constant load, Pump 2 peak load
P2 Auto= Pump 2 constant load, Pump 1 peak load
P1 + P2= Direct operation independent of float switches (or pressure switches) |
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Float switch F7 closes before F8 Q11: Pump 1 mains contactor Q12: Pump 2 mains contactor
Method of operation. The duplex pump control is designed for operation of two pump motors M1 and M2. Control is via float switches F7 and F8.
Operating mode selector switch S12 in position P1 auto: The system operates as follows: When the water level in the storage tank falls or
rises, F7 switches pump 1 on or off (basic load). If the water level drops below
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Q11: Pump 1 mains contactor
the range of F7 (discharge is greater than intake), F8 starts pump 2
(peak load). When the water level rises again, F8 is deactivated. Pump 2 continues running until F7 stops both pumps. The operating sequence of
pumps 1 and 2 can be determined using operating mode selector switch S12: Position P1 auto or P2 auto. |
Q12: Pump 2 mains contactor
In position P1 + P2, both pumps are in operation, independent of the
float switches (Caution! Tank may possibly overflow).
On the version of duplex pump control with automatic load sharing (T0(3)-4-15915), S12 has a further position: the sequence of operations
is automatically reversed after each cycle. |
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