1. No output, the fuse is normal This phenomenon indicates that the switching power supply is not working or has entered the protection state. First of all, it is necessary to measure whether the starting foot of the power control chip has a starting voltage, if there is no starting voltage or the starting voltage is too low, it is necessary to check whether the starting resistance and the external components connected to the starting pin are leaking, at this time, if the power control chip is normal, then the fault can be quickly found through the above inspection. If there is a starting voltage, measure whether the output of the control chip has a jump of high and low levels at the moment of start-up, if there is no jump, it means that the control chip is bad, the peripheral oscillation circuit components or the protection circuit are problematic, the control chip can be replaced first, and then the peripheral components can be checked; If there is a trip, it is generally a defective or damaged switch.
2. Fuse burning or frying, mainly check the large filter capacitor on 300V, the diodes and switch tubes of the rectifier bridge, etc., and the problem of the anti-interference circuit will also lead to fuse burning and blackening. It should be noted that the fuse burn caused by the breakdown of the switch tube will generally burn out the current sense resistor and the power control chip. Negative temperature coefficient thermistors can also easily burn out along with the fuse.
3. There is an output voltage, but the output voltage is too high This fault usually comes from the regulated sampling and regulated control circuits. In the DC output, sampling resistor, error sampling amplifier such as TL431, optocoupler, power control chip and other circuits together form a closed control loop, any problem will cause the output voltage to rise.
4. The output voltage is too low, in addition to the voltage regulation control circuit will cause the output voltage to be low, there are also some reasons that will cause the output voltage to be low:
b. The failure of the rectifier diode and filter capacitor at the output voltage end can be judged by the substitution method.
c. The performance of the switch tube will inevitably lead to the failure of the switch tube to be turned on normally, which will increase the internal resistance of the power supply and decrease the load capacity.
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Model introduction of Tianyi cam switch
LW42 series
LW42 series cam switch and safety switch are another series of high-quality products announced by Shanghai Tianyi Electric Appliance Co., Ltd. to meet customer needs.
Device function: personal safety is paramount, LW42 series cam switch and safety switch unique terminal plan ...
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Tianyi switch button - the color meaning of the button and indicator light and the place of use
1. Buttons
1. Red
Operation in hazardous situations. It is often used for emergency stops
Stop and break. It is often used to stop all machines, stop one or more motors, stop a certain part of a piece of equipment, make the electrical components lose power, and have a stop function reset button.
...
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Tianyi switch - the difference between the dual power supply automatic transfer switch CB and PC grade
First, the principle is different
1. Class Cb automatic switch is an electronic product that converts one or more load circuits from one power source to another
2. PC-level automatic transfer switchgear is an electrical appliance that converts one or several load circuits from one power supply to another. ...
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Tianyi switch - a measure to reduce the ripple and noise voltage of the switching power supply
Reduces EMI interference
The metal shell is used as a shield to reduce the interference of external electromagnetic field radiation. To reduce electromagnetic interference from the power line input, an EMI filter is added to the power supply input.
At the output, capacitors with good high-frequency performance and low ESR are used
The use of polymer solids ...
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Tianyi switch - precautions for the use of proximity switches
1. If it is installed on metal, a certain space must be ensured to avoid interference between the proximity switch and the metal other than the detection object, resulting in failure. The metal parallel to the sensing surface must be 3 times the sensing distance from the sensing surface. The metal around the shaft of the proximity switch must be outside the cylinder, close to ...
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Tianyi switch - the difference between C type and D type of air switch
The meaning is different, the scope of application is different, and the role is different.
Air opening C represents the current, and the D model represents the power. The scope of use is different. If it is a household electricity, the air switch of the C model is generally chosen. The role is different. Type C it is used for home lighting use, Type D is suitable for ...
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Tianyi switch - the operation method of dual power automatic transfer switch
First, first place the dual power supply on the adjustment table, and the phase wire and the neutral wire (neutral line) are docked in place, and can not be connected wrongly.
Second, after the line is connected, it is necessary to check the installed line, and then turn on the main switch of the debugging station to turn on the common and standby working power supply.
Three, when the double ...
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Tianyi switch - the structural characteristics of high-voltage load switch
The load switch and combination electrical appliances are mainly composed of frames, isolation switches (the current limiting fuse of the combination is on the isolation switch), vacuum switch tubes, grounding switches, spring operating mechanisms, etc.
The product has compact structure, small size, long life, strong closing and breaking ability, and simple operation and maintenance.
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What are the common problems of Tianyi switch - disconnector?
1. What are the common faults?
Answer: The common faults of the disconnector are: (1) The contact part is overheated. (2) Porcelain insulation damage and flashover discharge. (3) Refuse to pull and close. (4) Wrong pulling and closing.
2. The overheating of the contact part of the disconnector during operation is caused by ...
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VTeam switch – how to operate a linear DC power supply correctly
1) Voltage Setting: Turn on the DC switch, adjust the voltage knob to adjust the voltage reading to the desired operating power connection. If you need to lower the voltage, turn the potentiometer slowly so that the drip rate of the voltmeter is compatible with the speed of the manual adjustment knob.
2) Constant Current Setting: Connect ...
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Tianyi switch - the difference between the use of cam switch and load isolation switch
T-cam switches and P-block switches are used in a wide range of standard circuits and currents, and the number of combinations of cam switches is virtually unlimited. Different designs, front panels and dedicated switches ensure optimum sensitivity to meet the requirements.
Q1: P switch and T switch have ...
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What requirements should be met by Tianyi switch - disconnector?
(1) The disconnector should have an obvious disconnection point, which is easy to identify whether the electrical appliance is disconnected from the power grid.
(2) There should be reliable insulation between the disconnect points of the disconnector, that is, there should be enough distance between the disconnect points of the disconnector to ensure that it can work reliably under harsh climatic conditions, and ...
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Tianyi switch - what is the difference between proximity switch PNP and NPN?
The so-called PNP and NPN proximity switches are for the type of DC three-wire proximity switch output transistor, and even though many proximity switch output stages use MOS transistors, they are still called the same.
Differences: PNP type proximity switch: The type of proximity switch output transistor is P...
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Tianyi button signal light - how to choose and use the button indicator light
How to use the indicator color correctly?
1. The indicator light (also known as the signal light) is mainly used to attract the attention of the operator or instruct the operator to carry out a certain operation in the way of bright indication, and as an indication that a certain state or instruction is being executed or has been executed.
2. General ...
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Tianyi switch - the characteristics of the disconnector are introduced
1. Provide an electrical interval and a visible disconnection point during electrical equipment maintenance to ensure the personal safety of maintenance personnel [3] .
2. The disconnector can not be operated with load: it cannot be operated with rated load or large load, and it cannot be divided and combined with load current and ...
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Tianyi switch - the role of the disconnector switch
1. After opening, establish a reliable insulation gap to separate the equipment or line that needs to be overhauled from the power supply with an obvious disconnection point to ensure the safety of maintenance personnel and equipment.
2. According to the operation needs, change the line.
3. It can be used to divide and combine small currents in the line, ...
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Tianyi switch - the environmental conditions of the high-voltage load switch
1. Altitude: 2000m and below;
2. Ambient temperature: -25°C-+40°C;
3. Relative humidity: the daily average value is not more than 95%, and the monthly average value is not more than 90%;
4. Places without conductive dust, corrosive gases and water vapors;
5. No fire ...
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Tianyi switch - the main accessory of the air switch
Internal accessories
Auxiliary contact: The auxiliary contact is the contact mechanically linked by the main circuit of the circuit breaker, which is mainly used for the display of the circuit breaker opening and closing status, and is connected to the control circuit of the circuit breaker through the opening and closing of the circuit breaker to control or interlock its related electrical appliances. For example, to ...
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Tianyi switch - the use of dual power transfer switch
1. Install the dual power transfer switch with the power supply to ensure the correct access of the power supply.
2. Adjust the handle of the dual power transfer switch to the "automatic" position, so that the power supply will automatically detect the state of the other power supply, when one of the power supplies fails, the other power supply will ...
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Tianyi Button Signal Light - Color Classification of Signal Indicator and Its Meaning
(1) Green (HG, GL)
What it means: stands for Safety, Normal, Readiness (i.e., an indication under safe operating conditions or the readiness of a mechanical device to start).
Function: It is often used to indicate the state of equipment ready to start, all auxiliary components are in a state of preparation for operation, and various parts ...
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