Power supply of the inverter switching power supply should be taken from - News - Global IC Trade Starts Here Free Join
It is often necessary to perform separate power-on maintenance on the control board in the maintenance of the inverter. Whether it is to detect the motherboard or to repair the power supply A driver board, it is necessary to first make the switching power supply work, and provide conditions for the detection of each part of the circuit. Therefore, it is necessary to know where the power supply of the switching power supply circuit is taken, and then replace it with an external maintenance power supply. The power supply of switching power supplies generally has the following sources: 3) The power supply of the switching power supply is not connected to the DC circuit, but another 380V/220V voltage is used, which is obtained from any two phases of the inverter power supply input terminals R, S and T, and then sent to the switch after rectification and filtering. Power supplies, such as Fuji, Yaskawa, TECO inverter models. The function of the AC terminal power supply in Figure 3-2a is as follows:
RJ45 We are manufacturer of RJ45 3U Gold in China, if you want to buy Gold Flash Plated,8P8C with Shield,Shield with EMI please contact us.
The connection sequence of RJ-45 line in common B standard is orange white, orange, green white, blue, blue white, green, brown white and brown. When connecting different equipment, use standard a. the connection sequence is green white, green, orange white, blue, blue white, orange, brown white and brown. Generally, the pressing method of b-mark is commonly used. If you want to make a cross line, one side is a standard, and the other side is b standard.
Working in the data link layer, the switch has a high bandwidth back bus and internal exchange matrix. All ports of the switch are connected to the back bus. After the control circuit receives the data packet, the processing port will look up the address reference table in memory to determine which port the NIC (network card) of destination MAC (hardware address of network card) is attached to. The data packet is quickly transmitted to the destination port through the internal exchange matrix. If the destination MAC does not exist, it will be broadcast to all terminals After the receiving port responds, the switch will "learn" the new address and add it to the internal MAC address table. The switch can also "segment" the network. By comparing the MAC address table, the switch only allows the necessary network traffic through the switch. Through the filter and forward of switch, the conflict domain can be effectively reduced, but it can not divide network layer broadcast, that is, broadcast domain. The switch can transmit data between multiple port pairs at the same time. Each port can be regarded as an independent network segment, and the network equipment connected to it can enjoy all the bandwidth without competing with other devices. When node a sends data to node D, node B can send data to node C at the same time, and these two transmissions enjoy the full bandwidth of the network and have their own virtual connections. If a 10Mbps Ethernet switch is used here, the total flow flux of the switch is equal to 2 × 10Mbps = 20MBps, and the total flow flux of a hub will not exceed 10Mbps when using 10Mbps shared hub. In a word, switch is a kind of network equipment based on MAC address recognition, which can encapsulate and forward data frames. The switch can "learn" the MAC address and store it in the internal address table. By establishing a temporary exchange path between the originator and the target receiver of the data frame, the data frame can reach the destination address directly from the source address. RJ45 3U Gold,Gold Flash Plated,8P8C with Shield,Shield with EMI ShenZhen Antenk Electronics Co,Ltd , https://www.antenkcon.com
1) Take the two ends of the DC circuit directly from the main circuit of the inverter, that is, both ends of the storage capacitor, in the inverter circuit, the manufacturer is often marked as P (or P1, power supply + terminal), N terminal (power supply - terminal) ), the DC voltage between P and N is about 530V, as shown in Figure 3-1a. Most of the power supply for the inverter's switching power supply is taken here. For example, Delta, Dongyuan, Taian, Kangwo, Fuji and other inverters of some models of switching power supply, are taken from the DC circuit 530V DC voltage.
2) The storage capacitor of the DC loop, due to the withstand voltage relationship, is connected to the DC loop by two series, and the two capacitors form a voltage dividing point for 530V, and the voltage of the voltage divider is about 265V. Some inverter switching power supply is taken from point A (see Figure 3-1b), and the power supply voltage is reduced to 1/2. For example, the switching power supply of the INVT-79 series low-power inverter is taken from the 265V partial voltage of the DC circuit. 
From the power supply mode of the three inverter switching power supply circuits in Figure 3-1, you can make a simple maintenance power supply (see Figure 3-2) and place it in a position on the maintenance workbench. This maintenance power supply can be used. Power-on inspection of the inverter for disassembling, power-on inspection after the installation is completed, and offline maintenance of the CPU board and power supply 7 driver board. 
1) After the user repairs the inverter and measures the main wiring terminal without short-circuit fault, the AC terminal power supply of Figure 3-23 can be connected from the R and T power input terminals of the inverter to power on the inverter and perform preliminary inspection. The operation display panel has no display,
The control terminal has no voltage, etc., that is, the town determines that the fault is in the switching power supply circuit. The operation panel has a display, which can be used to adjust the fault record (some inverters do not have this function), start and stop the inverter, observe the operation and alarm (fault code), further determine the fault location, and provide the basis for disassemble detection. Note that:
1 As shown in Figure 3-1c, the AC terminal voltage should be connected to the S and T power input terminals of the inverter. Otherwise, the internal switching power supply of the machine cannot work due to the lack of working power. Measure the resistance value of only a few tens of ohms between the T and S terminals. It is necessary to carefully check and observe it. It is not necessarily a short circuit fault of the rectifier module. It may be that the power terminal is connected to the primary winding of the internal transformer.
The two parts of the inverter have a three-phase power input detection circuit, which is connected to the single-phase power supply. When the power is turned on, it will jump the "input phase failure" fault. It is necessary to find the relevant circuit in the circuit board and cut off or shield this alarm signal. (See Chapter 6 Fault Circuit Repair).
3 high-power inverters (such as models above 55KW), because the capacity of the storage capacitor of the DC circuit is large, the transient charging current of the capacitor is too large, so that the circuit breaker in the maintenance power supply trips. At this time, the AC terminal can be connected in series. Power resistors (such as 100 ohms / 400W for current limiting charging).
4 The maintenance department has three-phase power supply, which can be directly used for three-phase power supply.
2) After the inverter is repaired, after the whole machine is assembled, it can be fed into the AC terminal power supply in Figure 3-2a above, and the load terminal is connected to the 2.2KW three-phase motor, and the power is tested. Although the transformer TK1 has strong overload capability, it is necessary to adjust the frequency of the inverter in time so that the output current value is larger (such as 4A), and the time is shorter, limited to less than 10s to ensure the safe operation of the transformer.
The maintenance department has a three-phase power supply, and this test procedure does not require maintenance power.
The role of the DC terminal in Figure 3-2a is as follows:
When the DC terminal power supply is connected, the three-phase rectifier circuit and the DC circuit in the original inverter are all disconnected, and the power supply is used instead. In a certain sense, the DC terminal power supply is also a kind of safety inspection power supply. First, the power supply isolation function of the transformer itself, in case of touching the strong electric part during maintenance, there is no harm to the human body due to the absence of the ground circuit. Touching both power terminals at the same time can cause people to get an electric shock). Second, the power supply is a small-capacity power supply, and a series of 2A fuses. Even if there is a short-circuit fault in the machine circuit, the rectification and inverter modules will not be damaged due to the limitation of the power supply capacity and the function of the fuse.
1) When the power driver board and the CPU board are separately repaired, the DC terminal can be directly connected to the power supply terminal of the switching power supply to provide working power for the switching power supply, and the IGBT main board circuit and the driving circuit are checked.
2) When the whole machine is tested, this power supply can be used instead of the original DC circuit to supply power to the inverter output circuit, and the inverter circuit can be tested and inspected.
It should be noted that:
For large and medium power inverters, the storage capacitors have a large capacity and are generally assembled in a single container. During the overhaul process, it must be removed. When the inverter circuit, the drive circuit and the switching power supply are abnormal, the stored energy stored in the storage capacitor is enough to burn the expensive inverter module in an instant. The DC terminal power supply can directly supply power to the inverter circuit and the switching power supply circuit. It is strictly forbidden to connect the original large-capacity storage capacitor to the inverter power supply. After the electrical repair of each department is completed, load the storage capacitor when the whole machine is assembled.
For low-power inverters below 7.5KW, the storage capacitors are often directly soldered to the circuit board. If it is convenient to remove, it is best to remove it. If you can't remove it, you need to? The terminal cuts off the power supply to the inverter circuit, and then connects to the 1A or 2A fuse, and then picks up the person? Power supply at the end. The DC terminal power supply can be directly connected to the DC circuit of the low power inverter below 7.5KW.
The AC terminal power supply in Figure 3-2b can be used for power-on and repair of 220V AC-powered inverters before and after disassembly; DC terminal power supply can perform CPU board, power supply/drive board for inverters of this power supply level. The power-on maintenance; can be used as the power supply of the circuit switching power supply shown in Figure 3-16, which is convenient for power-on maintenance of the circuit board.