External electromagnetic interference can easily cause malfunctions
If there are interference sources around the inverter, they will invade the inside of the inverter through radiation or power lines, causing the control loop to malfunction, causing abnormal operation or shutdown, and even damage to the inverter in severe cases. It is necessary to take measures to suppress noise from the outside and eliminate the source of interference. The specific solutions are: first, try to shorten the wiring distance of the control loop and separate it from the main line; Second, the grounding terminal of the inverter should be carried out according to the regulations, and should not be mixed with electric welding and power grounding; Third, a noise filter is installed at the input end of the inverter to avoid interference introduced by the power supply inlet.
Failures caused by environmental issues
The inverter is an electronic device and has detailed requirements for the installation and use environment in its specifications. Vibration is the main cause of mechanical damage to electronic devices, and for occasions with large vibration impact, rubber and other vibration isolation measures should be used; Moisture, corrosive gases and dust will cause electronic devices to rust, poor contact, and reduced insulation to form short circuits; Temperature is an important factor affecting the life and reliability of electronic devices, especially semiconductor devices, air conditioning should be installed according to the environmental conditions required by the device or avoid direct sunlight.
It is essential to regularly check the air filter and cooling fan of the inverter. At present, the cooling fan of the inverter in use in the oil production plant is seriously damaged, and the working environment of some inverters is relatively poor, which seriously affects the heat dissipation and air circulation, resulting in the inverter is easy to trip and overheat in the high temperature season.
Parameter settings and failures caused by the equipment
The fault mainly occurs in the low-pressure inverter for the injection pump, and the fault is mainly manifested in the fact that it does not trip immediately when it starts, but trips during operation. Possible causes are:
(1) The working state of the pump is unstable;
(2) Excessive pipeline pressure;
(3) The ramp-up time is set too short;
(4) The speed reduction time is set too short;
(5) The torque compensation setting is large;
(6) Cause excessive space-load current at low speed;
(7) The electronic thermal relay is set improperly, and the action current is set too small, causing malfunction.
Faults in the motherboard and main circuitry
Due to the long service life and some unexpected reasons, the motherboard and the main circuit are damaged, and such failures will inevitably cause damage and scrap of components, which is the main consumption part of the inverter maintenance cost. The main ones are:
(1) Damage to the rectifier block;
(2) The charging resistor is damaged;
(3) The inverter module burns out;
(4) Damage to the filter capacitor;
(5) The motherboard and power board are damaged.
Failures caused by improper maintenance
In addition to the reason for the damage of the cooling system fan, there is also a major reason for the overheating alarm failure of most inverters, which is the lack of daily maintenance, and the dust accumulation of the inverter radiator is serious, which affects the heat dissipation.
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