AC contactor of the working principle and structural characteristics of
AC Russian contactor has four main components: ( 1) the electromagnetic system, including the attraction coil, a movable iron core and the static iron core; ( 2) the contact system, comprising three main contacts and a two normally open, two auxiliary normally closed contact, it and the movable iron core is connected together are linked with each other; ( 3) arc extinguishing device of large capacity, general AC contactor with arc extinguishing device, in order to quickly cut off the arc, from burning the main contact; ( 4) insulation casing and accessories, all kinds of spring, a transmission mechanism, a short circuit ring, wiring column.
Its working principle can understand so, when the coil is energized, a static iron core generates electromagnetic force, will be moving iron core is attracted, because the contact system and the movable iron core linkage, the movable iron core drives the three movable contact piece run at the same time, contact is closed, thereby connecting the power supply. When the coil is de-energized, suction disappeared, the movable iron core linkage relies in part on the reaction force of the springs and the separation, the main contact is switched off, cut off the power supply. The long distance open and control function.
With that of AC contactor coil voltage operation. AC contactor operating coil nominal voltage AC ( 36V, 110V, 220V, 380V, 660V ), DC ( 24V, 110V, 220V ) and other, for general use, many people think that the selection of 220V operating coil or a choice of 380V operating coil seemed merely conform to the original habit and control circuit, the actual not so.
Operating coil voltage of AC 220 V control line because of its working zero line and ground potential, working zero line are often designed as a multi-purpose bus, so that the control circuit wiring design more flexible control cable core wire, the required number is reduced, maintenance is convenient. So in either selection or maintenance needs to pay attention to.
Selection of AC contactor
For the experience of the person, has its own set of processes, and here I mainly that their own experience, if there is anything wrong, welcome everybody to discuss together:
The first type is clearly very few, operating voltage, manufacturers and other basic information, to avoid unnecessary trouble. Selection of the rated current should be considered when appropriate to put a little allowance. Contactor mechanical life in general are significantly higher than the electrical life of the contact, the ratio of roughly 5 than the 1. CJ12 series AC contactor arc shield, electromagnetic suction iron, the main contact, operating coil is the most easily damaged parts. CJ12 series AC contactor to always check the main contact action three-phase simultaneous, also should check the arc shield if it or affect contact work.
Selection is completed, after received the goods also need to confirm the quality of AC contactor. Usually pay attention to the following points: there is no smell smell, please check the winding and contact. Listen to see whether they have a very loud squeak - sound, such as may be low power supply voltage and the point of contact with dirt or dynamic and static iron core contact surface is dirty. If you hear the Kaka - contactor sucking not sound, for low supply voltage or contact with enough suction. After starting up, the contactor is attracted, such as compressor does not turn, you don't know the contact of a contactor is broken, please immediately contact the manufacturer for a replacement.
The above information is provided in electrical switch factory, for reference only, www.jiandq.com 15957745520