If there is no ground wire, all three wires are live wires. The motor has forward and reverse rotation, and there are arrows on the pump. If it is reversed, simply adjust the position of. any two wires. You can connect it casually. The three three-phase electrical wires are live wires, so there will be no effect. The three wires are connected to the three-phase power supply respectively. For example, simply reverse and swap two power wires.
The three phases adopt a triangle connection or a Y-shaped connection, and the chassis is directly grounded without a neutral wire.
One of the four wires is the ground wire, which is usually marked with a colored wire and has a fine wire diameter. The other three are power cords. First connect the power and see how the water pump turns. If the direction is reversed, change the order of the phases. If the ground wire is not keyedairely marked, you can use a multimeter to find three wires that resist each other, with the remaining wire being the ground wire.
Detailed information:
When the three-phase alternator supplies the outside world, the three phase alternator The X, Y and Z ends of the group coil are connected together and a line is drawn from the connection point. This line is called the zero line, also called the neutral line. Next, pass a wire to the other ends A, B and C of the winding.
In each phase stator winding of a three-phase asynchronous motor, when a sinusoidal alternating current flows, each phase stator winding generates a pulsating magnetic field. Since the spatial positions of the three-phase windings placed in the core have a spatial phase difference of electrical angle of 120° relative to each other, the alternating currentsThree-phase tifs flow through the windings respectively and the currents of each phase are 120° different from each other. the other in time, so that they produce three three-phase currents at the same time. The total magnetic field synthesized by two pulsing magnetic fields in space becomes a rotating magnetic field.
The three-phase five-wire system refers to lines A, B, C, N and PE. Among them, the PE line is a specially designed protective earth wire, also called safety wire. used to connect to collateral such as equipment shells for electrical safety purposes. The PE line is connected to the N line on the power transformer side, but it cannot be used as the neutral line after entering the user side, otherwise it will be the same as the three-phase four-wire system after chaos. .
The N line and the PE line must be grounded several timestaken from the user side to improve reliability. However, repeated grounding is just repeated grounding. It can only be connected to the grounding point or somewhere close to the grounding, but that doesn't mean it can be connected to any place, especially indoors .
It is best to use standard/standard wire colors in the application: **for wire A, green for wire B, red for wire C, light blue for wire N and yellow-green for PE wire. .