The scenario
A three-phase water pump motor is controlled by a float switch using a direct-on-line starter. The control circuit includes start/stop pushbuttons and an auxiliary holding contact to maintain operation.
What is in this drawing
Read the decisions behind it.
01
Use a star-connected motor model with inductors for each phase.
02
Include thermal overload relay with auxiliary NC contact in control circuit.
03
Float switch wired in series with the control circuit to stop the pump when water level is high.
This DOL starter circuit is suitable for small to medium three-phase motors in applications such as water pumps, fans, and conveyors where the mechanical load can withstand full voltage starting.
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