Why is the fire pump, the control box to the pump through 4 wires, each of which is what role?
The three phase lines include the A phase, the B phase and the C phase, which generate magnetic force to the motor and cause rotation of the rotor. The ground wire is used to protect the safety of the body and the safety of the equipment when the motor is out of circulation.
Fire pump control box to pump the 4 wires, of which there are three lines, and one is the ground wire.
The first thing to make clear is that your pump is a three-phase AC motor that requires three-phase AC power to operate.The three-phase AC motor works as follows: the stator is fed into the three-phase alternating current to produce a rotating magnetic field. The magnetic field cuts the rotor and induces the current in the squirrel cage rotor coil. The induced current builds up the magnetic field again. There is a mutual force between the rotating magnetic field of the stator and the magnetic field created by the rotor, so the motor rotates.The ground wire is used to protect personal safety.
