What are the tips for choosing a time RF sensor?

　　1. Understand the requirements first

　　① The power supply voltage of the control circuit can provide the maximum current;

　　② Voltage and current in the controlled circuit;

　　③ The controlled circuit needs several groups and what form of contacts.

　　There are two ways to represent the contacts of the time RF sensor: one is to draw them directly on the side of the long box, which is more intuitive. The other is to draw the contacts into their respective control circuits according to the needs of the circuit connection, usually at the same time, the contacts of the RF sensor and the coil are marked with the same text symbol, and the contacts are numbered to show the difference. There are three basic forms of contact for time RF sensors:

　　1. Dynamic type (H type) coil is not powered on when the two contacts are disconnected, time RF sensor, skill, after power, two contacts are closed. It is represented by the alphabetic prefix "H".

　　2. The breaking type (D-type) coil is not powered on when the two contacts are closed, and the two contacts are disconnected after the power is powered on. It is denoted by the phonetic prefix "D".

　　3. Conversion type (Z type) This is the contact group. This contact group has a total of three contacts, that is, the middle is a moving contact, the upper and lower one static contact. When the coil is not powered on, the moving contact and one of the static contacts are disconnected and the other is closed. After the coil is powered on, the moving contact moves the selection, time RF sensor, and skill, so that the original disconnected state is closed, and the original closed state is disconnected to achieve the purpose of conversion. Such a group of contacts is called a transfer contact. It is represented by the pinyin prefix "z" of the word "turn".

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