Delta inverters still have a certain influence in the industry, but even if the reputation is good, it will inevitably show some failures. Let's take a look.
First, the inverter repair must first check whether the sound in the operation of the motor is abnormal, including, whether the motor operation is causing a sensation.
2. Check whether the natural environment of the inverter installation has changed. For example, whether the operating temperature is normal. Anyone who understands the maintenance of Delta's inverter should know that the operating temperature of the inverter is generally specified in the range of -10°C to +40°C, and it is advisable to go up and down 25°C.
3. Check whether the inverter heat exhaust fan is in normal operation, for example, whether the inverter heat exhaust safety channel is unobstructed, and whether the main parameters of the inverter on the indicated control panel are normal.
Fourth, the inverter repair also has to check whether the inverter is high temperature. You can use an infrared thermometer to check whether the radiator of the inverter is high temperature or whether it has a strong odor. It is also necessary to check whether there are common fault alarms in the operation of the inverter.
5. The protection and maintenance of Delta's inverter should also ensure that the filter screen of the air inlet pipe inside the low-voltage complete set of equipment is lifted on time on a daily basis. Long-term maintenance of the control box and inverter in excellent finishing condition. Because that can reasonably remove the area dust on the inverter, but also prevent the dust from entering the inverter, reasonably remove the oil stains of the inverter fan, and reduce the generation of heat exhaust problems.
Delta's DVP-1 22KW inverter has no reflection when powered on, no display on the actual operation control panel, and the 24V operating voltage of the control terminal is 0. Identify the common faults of the power supply system circuit of the switching power supply circuit or the switching power supply circuit. There is no 530V communication voltage at both ends of the energy storage capacitor of the direct current circuit.
Further check that the circuit breaker FU of the pre-charging circuit has already melted, resulting in the switching power supply circuit unable to get the input power supply, and the whole machine strikes. The reason for the full consideration of melting is that the thyristor in the three-phase rectifier circuit is not triggered to open and off, and the pre-charged power supply circuit is subjected to current impact, so the FU is melted.
After replacing the FU with a new one, the power is turned on, and the communication voltage cannot be checked at the trigger terminals of the three thyristors. When the short contact is with VT3 in the power generation circuit, the trigger terminals of the three thyristors are all triggered by the operation voltage, and the three thyristors are turned on. Check that the collector junction of VT3 has long been destroyed by open circuit, and after replacing VT3 with power transistor BU406, the common fault is resolved.
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