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How to ensure the credibility of the self-locking switch work?

How to ensure the credibility of the self-locking switch work?

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  • Time of issue:2021-03-05
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(Summary description)​In the application of self-locking switch, according to the characteristics and characteristics of the power switch electrical equipment, there is an indispensable application of normally closed and

How to ensure the credibility of the self-locking switch work?

(Summary description)​In the application of self-locking switch, according to the characteristics and characteristics of the power switch electrical equipment, there is an indispensable application of normally closed and

  • Categories:Company news
  • Author:
  • Origin:
  • Time of issue:2021-03-05
  • Views:0
Information

​In the application of self-locking switch, according to the characteristics and characteristics of the power switch electrical equipment, there is an indispensable application of normally closed and an indispensable application of normally open. Naturally, there is also a choice of either normally open or normally closed. It is necessary to dismantle and replace according to the original design plan, and do not make subjective judgments. The same is true for other self-locking switches. Both start and stop normally open and normally closed switches are available. Be sure to check when disassembling and replacing!

The self-locking switch must be "normally closed" whether it is operating the AC contactor or as the key-in point of the plc. Only in this way can the reliability of the self-locking switch work be ensured.

For self-locking switches, I think it is still possible to use the normally closed point, and the same goes for entering the PLC. When the normally open point is used to guide the route, the emergency stop power switch will fail, and the actual effect of the emergency stop will not be achieved. Nowadays, many emergency stops into the PLC use the normally open point, which is considered inappropriate. It should be the normally closed point + the program flow normally open point.

1. The function of self-locking switch

The self-locking switch is an automatic switch operated by a certain part of the body (usually a finger or palm) and is calibrated with elastic energy storage technology. It is one of the most common master household appliances. The allowable amount of current for the contact of the self-locking switch is small, generally not more than 5A. Therefore, under normal circumstances, it does not immediately manipulate the conduction of the main power supply circuit (large current power supply circuit), but transmits command data signals in the control loop (small current power supply circuit) to manipulate AC contactors, automobile relays and other household appliances. For electrical appliances, they then manipulate the conduction of the main power circuit, change of functions, or the interlocking of household appliances.

2. The basic principle and mark of the structure of the self-locking switch

The self-locking switch is generally composed of a self-locking switch cap, a calibration spring, a movable contact of an accumulation chain, a static contact, a supporting crankshaft and a casing.

The self-locking switch will not be subjected to external force (ie static data) when the contact is opened and closed. It is divided into termination self-locking switch (ie moving-off self-locking switch), starting self-locking switch (ie moving and closing self-locking switch) and composite type Self-locking switch (that is, a self-locking switch with a combination of moving on and off contacts).

When the self-locking switch is subjected to external force, the opening and closing conditions of the contacts change:

3. The meaning of the color of the self-locking switch

4. The model specification and meaning of the self-locking switch

5. Self-locking switch structure number

K—open type, embedded in the operation control panel;

H—Maintenance type, with a maintenance casing, which can prevent internal parts from being damaged by mechanical equipment or inadvertently touched by people to induce electricity;

6. Model specification and meaning of self-locking switch

S—moisture-proof type, with a sealed casing, which can avoid the intrusion of precipitation;

F—anti-corrosion type, which can avoid the entry of corrosive vapor;

J—emergency type, with red big mushroom self-locking switch (highlighted out), used for emergency disconnect switch power supply;

X-Knob type, use the knob to rotate to carry out the operation, there are two positions of on and off;

Y-lock key operation type, use the key to insert to carry out the operation, which can avoid misoperation or be operated by full-time personnel;

D—Mouse cursor self-locking switch. The self-locking switch is equipped with a signal indicator, which also serves as a data signal indicator.

7. The selection of self-locking switch

1. Select the type of self-locking switch according to the application place and actual main purpose. For example, the self-locking switch embedded in the operation control panel can choose the open type; the mouse cursor type that needs to display the operating status of the information; the key operation type should be used in the key places that must avoid the misoperation of the staff; where there is corrosive vapor Use anti-corrosion type.

2. Select the color tone of the self-locking switch according to the operating status indication and working conditions. For example, the starting self-locking switch can be white, gray, or gray-black, and milky white or emerald green can be preferred. The self-locking switch should be red. The termination self-locking switch can be selected in black, gray or milky white, gray-black is preferred, and red can also be used.

3. The total number of self-locking switches must be selected according to the control circuit. Such as single button, double button and triple button.

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