Alternate Operation of Two Motor Pumps
If the frequency of operation of pumping liquid into a tank is to frequent, too much stress is subjected to a single motor pump. In such case the life span of the motor may not last long. To avoid to much stress to a single motor pump, it is wise to add another motor pump. The two motor are design to operate alternately. Figure (A) illustrate two motor pumps that alternately pumps liquid into tank. Control Operation Figure (B) illustrate the schematic diagram of the control circuit of the “Alternate Operation of a Two Motor Pump”. Closing the toggle switch SW will place the control circuit ready for operation. As the liquid level in the tank drops to the lower limit LL as shown in figure (A). The float switch* contact FS (1-2) will close, see figure (B). Contactor M1 (A-B) is energize by the current that flows from the line L1, toggle switch SW, float switch FS (1-2), contact M2 (11-12), contact R (11-12), contactor M1 (A-B) and to line L2. contact M1 (13-14) will close to maintain con...