Limit switch and micro -switch (also known as the itinerary switch) are common small current cam controller household electrical appliances. Utilizing the impact of energy components to complete the connection or disconnection of the control circuit to achieve a certain manipulation purpose. Generally, this switch is used to limit the location or itinerary of the molecular heat movement, so that the machinery and equipment of the fitness movement can automatically stop, reciprocate, change, or fully automatically move back and forth according to a fixed position. Limited switch is generally suitable for various CNC lathes and lifting equipment, which is used to control its itinerary and the positioning and protection of terminal equipment. In the control loop of the elevator car, the limit switch is also used to control the layer [door opening and closing speed, automatic door opening and closing position, and the upper and lower limit of the elevator car.
What are the three main points that need attention when using the limit switch?
1. Electric standard
The amount of communication and DC switching is very different. Use a limit switch in the rated category. DC quota, low control. This is because it does not have zero point, - Dan generates the arc to fade, and the arc has a long time. And the direction of the current is certain, so a touch transfer occurs, so that the touch will not be disconnected due to asymmetric.
2. Touch protection circuit
In order to extend the life of the limit switch, avoid noise, and reduce the arc caused by carbon or sodium cyanide, the contact should be used to protect the power circuit. But if the operation is wrong, the disadvantages may be greater than benefits.
3. Application environment
Do not use the limit switch separately when there is flammable or combustible gas mixture. The arc generated by the hot switch may cause fire or explosion. The switch is not a moisture -proof sealing structure. The protective cover should be used to prevent oil or water from overflowing, splashing or dust adheres to direct liquid.
