The appearance and application of the inverter makes the complicated control simple and makes the production process more convenient and faster. However, the inverter, like other control devices, inevitably has a problem in the application. In the process of using the inverter, the inverter trip is a common fault. When the inverter has such a fault problem, how can we deal with it quickly? Today, Meijiewei will introduce in detail the common trip faults of the inverter.
1, power failure handling
If the power supply is temporarily powered off or the voltage is low, the “undervoltage” display, or the “overvoltage” display of the instantaneous overvoltage will cause the inverter to trip and stop, and then restart after the power is restored.
2, external fault handling
If the input signal is open, the output line is open, phase-out, short-circuit, grounding or insulation resistance is very low, the motor is faulty or overloaded, etc., the inverter will display “external” fault and trip and stop. After the fault is eliminated, it can be re-enabled.
3, internal fault handling
If the internal fan is open or overheated, the fuse is open, the device is overheated, the memory is faulty, the CPU is faulty, etc., it can be switched to the power frequency operation without affecting the production. After the internal fault is eliminated, the inverter operation is resumed.
In the event of an internal fault in the inverter unit, such as during the warranty period, the manufacturer or manufacturer is required to be responsible for the warranty.
Perform the following checks based on the category and data displayed by the fault:
After opening the chassis, first observe whether there are any broken wires, solder joints, burnt odors or deterioration of components inside, if any, it should be handled in time.
Use a multimeter to check the resistance of the resistor and the on-resistance of the diode, switch, and module to determine whether to break or break down. If yes, replace it with the original nominal value and the withstand voltage value, or replace it with the same type.
The waveform of each working point is detected by a double trace oscilloscope, and the fault location and components are judged by the stepwise elimination method.
Issues to be aware of during maintenance:
Strictly prevent the false welding, virtual connection, or wrong welding, continuous welding, or wrong connection, especially do not mistakenly connect the power cord to the output.
Power-on static check indicator, digital tube and display are normal, and the preset data is appropriate.
If there are conditions, a small motor can be used for the simulation dynamic test.
With load test.
4, the function parameter setting is improperly handled
When the parameters are preset, the no-load test is normal, and an “overcurrent” trip occurs after loading. It may be that the starting torque is not set enough or the acceleration time is insufficient. After some operation, the moment of inertia decreases, causing the "overvoltage" to trip during deceleration, modifying the function parameters, and increasing the acceleration time appropriately.