Daily inspection item 1 of Delta's inverter problem repair:
Check whether there are any abnormal changes in the sound of the motor during operation, including whether there is vibration during the operation of the motor.
Routine inspection item 2 of Delta inverter problem repair:
Check if there are any changes in the environment in which the inverter 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 problem 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 problem 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 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 problem repair item 5:
In the repair and maintenance of Delta's inverter, the filter screen of the air inlet duct inside the electrical control cabinet should be regularly sorted out on a daily basis. The control cabinet and the frequency inverter are in excellent cleanliness for a long time. Because this can effectively sort out the dust on the surface of the inverter, it can also prevent dust from entering the inverter, effectively remove the oil stain of the inverter cooling fan, and reduce the occurrence of heat dissipation problems.
Delta's inverter has no response when powered on, the operation panel does not appear, and the 24V voltage of the control terminal is 0, which can be identified as the 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 not working.
Considering that the fuse is due to the fact that the thyristor in the three-phase rectifier circuit is not triggered to turn on, the pre-charge circuit fuses the FU 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 in short contact, the trigger terminals of the three thyristors have a 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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