Design and build a control system to operate two parking lot pumps at a petroleum facility. The control system is to consist of simple components, no programmable controllers, to alternate two pumps for load sharing and have hand off auto switch for both pumps to operate one at a time in auto or manually. Additionally, the system is to include two motor starters, high and low floats, and meet the facilities sight requirements.


Along with providing an electrical schematic, EASI also provided a system which included the following key components:

  • (2) motor starters for 40 HP pumps in stainless steel enclosure (NEMA 4X) with heater to eliminate condensation
  • Controller enclosure to load share the two 40 HP pumps
  • NEMA 4X
  • Hand Off Auto for each pump
  • Emergency stop push button
  • Reset button
  • Heater to eliminate condensation
  • Relays, no programmable devices