Precautions when connecting the server

I have been engaged in industrial maintenance for many years, and customers often burn out the drive due to improper wiring. One of the most common problems is that when customers use PLC to pulse the servo, there is no series resistance between PLS (pulse signal) and DIR (direction signal) and the PLC, which causes the interface circuit of the Dongguan server to burn out. Analysis of Dongguan server repair manufacturers: Generally, PLCs are powered by 24V, while Panasonic Dongguan server has only a 500 ohm current limiting resistor, 24V/500 ohm, 48ma, which can run normally in a short time, but after a long time, the current limiting resistor It will burn out, some even burn out the copper skin and signal isolation optocoupler.

As a result, the equipment cannot be operated, causing losses to customers. Therefore, if the PLC signal power supply is 24V, a 1.5K resistor must be connected between the two signals and the PLC, and the resistor power should not be too small and should be about 1W. Some use 5V to power the PLC signal, so there is no need to connect a resistor in series.

Common sense and application precautions of IGBT in Dongguan server

2. Replacement of IGBT tube

Because the IGBT tube works in the state of high current and high voltage, the operating frequency is high, and the heat generation is large, its failure rate is high, and because of its high price, the following principles should be followed when replacing the IGBT tube: First, try to use The replacement of the original model is not only conducive to fixed installation, but also relatively simple. Secondly, if there is no tube of the same model, it can be replaced with an IGBT tube with similar parameters. Generally, a tube with a larger rated current is used instead of a tube with a smaller rated current. Use high withstand voltage instead of low withstand voltage. If the parameter has been worn out, it can be replaced according to its rated power.

Third, the preservation of the IGBT tube

The temperature and humidity of the place where the semiconductor components are stored should be kept at room temperature and humidity, and should not deviate too much from the general. The room temperature is specified as 5~35 degrees Celsius, and the room humidity is specified as 45%~75%. In areas that are particularly dry in winter, humidification is required. The container for installing IGBT tube module in machine humidification should choose a container without static electricity and try to keep it away from corrosive gas or dusty places. There may be dew condensation on the surface of the IGBT module in places where the temperature changes sharply. Therefore, the IGBT module should be Put it in a place where the temperature changes little.