Conduction angle requirements:

The module outputs a larger current when the conduction angle is small (that is, the module has a high input voltage, a low output voltage), which will cause the module to seriously heat up or even burn. This is because the current value measured by an ordinary instrument in a non-sine wave state is not an effective value. Therefore, although the current value displayed by the instrument does not exceed the nominal value of the module, the effective value will exceed the nominal value of the module. Times. Therefore, the module is required to work under a larger conduction angle (above 100 degrees). The maximum allowable output current ratio of the module under different output voltages can be seen in Table 1.

U real: the actual output voltage of the module; U mark: the highest voltage that the module can output;

I real: the actual output current of the module; I standard: the nominal maximum current of the module.

Example: 100A three-phase AC module, the power grid is 380V, corresponding to different output voltages, the maximum output current is shown in Table 2

other request:

(1) When the module controls the load of the transformer, if the transformer is unloaded, the output current may be less than the holding current of the thyristor chip, resulting in a large DC component in the loop, and the fuse will be burned in severe cases. In order to avoid the above situation, a fixed resistor can be connected to the output terminal of the module. Generally, the output current of each phase is not less than 500mA (specific data can be determined according to the test situation).

(2) The main electrode of the small-size module is not fastened with screws, and it is easy to be lifted and broken. When wiring, pay attention to avoiding external force or cable gravity to pull the electrode and break it.

(3) It is strictly forbidden to directly crimp the copper wire of the cable on the module electrode to prevent additional heating due to poor contact.

(4) The module cannot be used as an isolating switch. To ensure safety, an air switch is required in front of the input terminal of the module.

(5) When measuring the working case temperature of the module, the test point should be the radiator surface close to the center of the module bottom plate. Drill a deep hole horizontally below the surface of the radiator to the center of the radiator, and insert the thermocouple probe into the bottom of the hole. It is required that the temperature of the test point should be ≤80℃.