If you want to reduce the fault rate of Delta inverter, it is necessary to check it daily, and what are the detailed items?
Daily inspection item 1 of Delta inverter fault repair:
Check whether there are any abnormal changes in the sound during the operation of the motor, including whether vibrations occur during the operation of the motor.
Routine inspection of Delta inverter fault repair item 2:
Check if there is any change in the environment in which the drive is installed. For example, whether the ambient temperature is normal. Anyone who understands Delta inverter repair should know that the operating temperature of inverter is generally required to be in the range of -10°C to +40°C, and about 25°C is preferred.
Routine inspection of Delta inverter fault repair item 3:
Check whether the inverter cooling fan is operating normally, for example, whether the inverter's heat dissipation channel is unblocked, and whether the current, voltage, frequency and other parameters of the inverter's display output on the display panel are normal.
Routine inspection of Delta inverter fault repair item 4:
Check to see if the inverter is overheating. For the check of the overheating of the inverter, you can use an infrared thermometer to first detect whether the heat sink of the inverter is overheated, or whether there is any peculiar smell. It is also necessary to check whether there is a fault in the operation of the inverter, and the alarm is displayed.
Routine inspection of Delta inverter fault repair item 5:
During the repair and maintenance of Delta's inverter, the filter screen of the air inlet duct inside the electrical control cabinet should be cleaned regularly. The control cabinet and frequency converter are kept in an excellent state of cleanliness for a long time. Because this can effectively clean the surface dust on the inverter, it can also avoid dust from entering the inverter, and effectively remove the oil stain of the inverter cooling fan to reduce the occurrence of heat dissipation problems.
Delta's inverter has no response when powered on, no display on the operation panel, and the 24V voltage of the control terminal is 0, which can be judged as a power supply circuit defect of the switching power supply or switching power supply. There is no 530V DC voltage at both ends of the energy storage capacitor of the power-on detection DC circuit, and the fuse FU of the pre-charging circuit is now fused, resulting in the switching power supply not getting the input power supply, and the whole machine is not working.
Considering that the fuse is due to the fact that the thyristor in the three-phase rectifier circuit is not triggered to conduct, the pre-charge circuit is fused due to the impact of the operating current. After replacing the FU with a new one, the DC voltage cannot be detected at the trigger terminals of the three thyristors.
When the Delta inverter in the power generation circuit is briefly touched, the trigger terminals of the three thyristors have trigger voltage input, and the three thyristors are turned on. Check that the collector junction of Delta's inverter is now damaged by open circuit, and the problem is eliminated after replacing the VT3 with the power tube BU406.
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