That tiny relay on the instrument – how is it used to drive an AC contactor in order to control the large water pump? I don’t know how to do it; who can teach me?
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How can that tiny relay in the instrument be used to drive an AC contactor in order to control a large water pump? I don’t know how to do it; who can teach me? . . Thank you. I am extremely grateful. . {:2_45:}{:2_45:}{:2_45:}
A low-voltage control electromagnet activates the high-voltage circuit.
The relay controls the on/off of the large water pump circuit, and it doesn’t require much effort.
Motor 10kw outside. . .
One side of the normally open contact of the relay is connected to a 220VAC power supply, while the other side is connected to the coil of the contactor. The start/stop signal is connected to the coil of the relay (usually pins 13 and 14). . . . . . . . . . . . . . If what I said is wrong, please don’t laugh: lol
Generally, a DCS or PLC outputs a digital signal to control the coil of the intermediate relay; the AC contactor in the electrical cabinet is connected to the normally open contact of the intermediate relay. Of course, a normally closed contact can also be used, depending on the requirements. The power supply for AC contactors is generally connected in series within the electrical cabinet.
What a joke – is there anything Pig Lord can’t do?
Disclaimer: Not an electrical professional, not a designer.
Just add an intermediate relay with an appropriate contact capacity in between.
An AC contactor uses its main contacts to control the circuit, while it employs auxiliary contacts (Figure 3) to enable the operation of the control circuit. The main contacts are generally normally open contacts, while the auxiliary contacts usually consist of two pairs of normally open and normally closed contacts. Small contactors are also often used as relay switches in conjunction with the main circuit. The contacts of AC contactors are made of silver-tungsten alloy, which offers good electrical conductivity and resistance to high-temperature ablation. The operation of an AC contactor is driven by the magnetic field generated when alternating current passes through a coil with an iron core. The electromagnet core is composed of two \"mountain\"-shaped sheets of silicon steel stacked together; one of these serves as a fixed core onto which the coil is wound, and various operating voltages are available. To stabilize the magnetic force, a short-circuit ring is added to the attracting surface of the core. After losing power, the AC contactor returns to its original position thanks to the spring. The other half is a movable core, which has the same structure as the fixed core and is used to drive the closing and opening of the main contacts and auxiliary contacts. Contactors of 20A and above are equipped with arc extinguishing covers that use the electromagnetic force generated when the circuit is disconnected to quickly interrupt the arc and protect the contacts. The contactor can operate at high frequencies; when used for controlling the on and off of power supplies, its maximum operating frequency can reach 1200 times per hour. Contactors have a very long service life; their mechanical life is typically several million to ten million operations, while their electrical life is generally in the range of hundreds of thousands to several million operations.