Japan Yaskawa inverterAt present, it is very common in our country, which mainly depends on the strong quality and performance of Yaskawa inverter. They are widely used in various mechanical equipment. Shenzhen Oudejie Technology Co., Ltd. specializes in the sale of original imported Yaskawa inverter, and promises to sell products are new original imported, while providing our customers with quotation, selection, product information and other services. The following is to share some common fault maintenance methods of Yaskawa inverter, I hope it will be useful.

1. The switching power supply is damaged

Switching power supply damage is the most common fault in many inverters, usually caused by the load switching power supply short circuit caused by the switching power supply, in the many circuit design of the inverter, Yaskawa inverter is because of more success. The 616G3 uses a two-way switching power supply, somewhat similar to the Fujifilm G5, and the DC voltage of the DC link of the first stage switching power supply changes from more than 500 volts to more than 300 volts. Then through the high-frequency pulse transformer secondary coil output 5V, 12V, 24V and other low voltage for the inverter control board, drive circuit, detection circuit as a power supply. When designing the secondary switch of Yaskawa power supply, a controllable voltage regulating device named TL431 is used to adjust the switching duty ratio to achieve the purpose of stabilizing the output voltage. The LG converter we talked about in previous installments uses a similar control approach. Because the switch tube QM5HL-24 and TL431 are relatively easy to damage the components. In addition, in use should be heard by the pulse transformer issued a harsh scream, it is likely to be the output switching power supply side short circuit. We can find the fault from the output. In addition, when there is no display, no voltage control terminal, DC12V, 24V fan does not turn, we must first consider whether the switching power supply is damaged. This is coming from a pulse transformer, most likely a short circuit on the output switching power side. We can find the fault from the output. In addition, when there is no display, no voltage control terminal, DC12V, 24V fan does not turn, we must first consider whether the switching power supply is damaged. This is coming from a pulse transformer, most likely a short circuit on the output switching power side. We can find the fault from the output. In addition, when there is no display, no voltage control terminal, DC12V, 24V fan does not turn, we must first consider whether the switching power supply is damaged.

2. The SC is faulty

SC failure is relatively common in Yaskawa inverters. IGBT module is damaged, which is one of the causes of SC fault alarm. In addition, the drive circuit is damaged, which is easy to cause SC fault alarm. In the design of the drive circuit, the upper bridge uses the drive PC923, which is a coupler dedicated to the drive module IGBT amplifier circuit, and the lower bridge Yaskawa drive circuit uses the optocoupler PC929, which is an internal amplifier circuit and detection circuit, optocoupler. In addition, motor jitter, three-phase current, voltage imbalance, frequency display but no voltage output, these phenomena may be IGBT module damage. There are many reasons for IGBT module damage, the first is the external load failure causes IGBT module damage, such as load short circuit, blocked rotation and so on.

3. OH overheating

Overheating is usually a problem. In this case, the first thing that comes to mind is that the cooling fan is running, observe the outside of the machine to see whether the fan is running, in addition to the machine above 30kW, the machine is also equipped with a cooling fan, the reason why the fan will damage the alarm.

4, UV undervoltage fault

When the undervoltage fault, we should first check whether there is a lack of phase input power supply, if there is no problem with the input power supply, we should check whether there is a problem with the rectifier circuit, if there is no problem, we can see whether there is a direct current detection circuit problem. When DC bus voltage is lower than 190VDC, machine 200V level, UV alarm; The machine is 400V level, and the fault alarm occurs when the DC voltage is lower than 380VDC. Mainly check whether the circuit has step-down resistance.

5, GF -- ground fault

Fault grounding fault is usually encountered, after eliminating the cause of the motor grounding problem, it is likely that the fault is part of the Hall sensor, the sensor due to temperature, humidity and other environmental factors, the operating point is prone to drift, resulting in GF alarm.

The above content is about Yaskawa inverter common fault maintenance methods.