Repair of Delta inverter problemsView items

Daily inspection item 1 of Delta's inverter problem repair:

Check whether there is any abnormal change in the sound of the motor during operation, including whether oscillation occurs during the operation of the motor.

Repair of Delta inverter problemsView items

Repair of Delta inverter problemsView items

Routine inspection item 2 of Delta inverter problem repair:

Check if the environment in which the inverter is installed has changed. For example, whether the ambient temperature is normal. Those who are familiar with the repair of Delta inverters should know that the operating temperature of inverters is generally required to be in the range of -10°C to +40°C, with about 25°C being the best.

Routine inspection of Delta inverter problem repair item 3:

Check whether the inverter cooling fan is operating normally, for example, whether the heat dissipation channel of the inverter is unblocked, and whether the current, voltage and frequency of the output of the inverter on the display panel are normal.

Routine inspection of Delta inverter problem repair item 4:

Check to see if the inverter is overheating. Regarding 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 a 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:

The repair and maintenance of Delta's inverter should also be done on a daily basis, and the filter screen of the air inlet duct inside the electrical control cabinet should be regularly sorted out. The control cabinet and frequency inverter are in an excellent state of 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, and 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 measurement 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 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 open and damaged, and the problem is eliminated after replacing the VT3 with the power transistor BU406.

Repair of Delta inverter problemsView items

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