Frequency converter tripping occurs during operation
If the frequency converter trips during actual equipment operation, it is regarded as a fault. There are several methods to deal with tripping faults:
1. Equipment power supply failure
For example, a momentary power outage or low voltage of the equipment, an "undervoltage" display, or an "overvoltage" display due to instantaneous overvoltage will cause the inverter equipment to trip and shut down. It can be restarted after the power supply returns to normal.
2. External fault of the frequency converter
If the input signal is disconnected, the output line is open, phase-open, short-circuited, grounded or the insulation resistance is very low, the motor fails or is overloaded, etc., the inverter equipment will display an "external" fault and trip and stop. After technical troubleshooting, it can be restarted. .
3. Internal fault of the frequency converter
In case of internal fan breakage or overheating, fuse breakage, device overheating, memory error, CPU failure, etc., it can be switched to power frequency operation without affecting production. After the internal fault is eliminated, variable frequency operation can be resumed.
If an internal failure occurs in the frequency conversion equipment, if it is within the warranty period, the manufacturer or local agent must be notified for warranty.
Carry out the following checks based on the fault display conditions and data:
1) After opening the case, first observe whether there are broken wires, weak soldering, burning smell, or deteriorated and deformed components inside. If there are any, they should be dealt with in time.
2) Use a multimeter to detect the resistance of the resistor and the on-off resistance of the diode, switch tube and module to determine whether it is broken or broken down. If so, replace it according to the original nominal value and withstand voltage value, or replace it with the same type.
3) Use a dual-trace oscilloscope to detect the waveforms of each operating point, and use the step-by-step elimination method to determine the fault location and components
Issues that should be paid attention to during maintenance:
1) Strictly prevent false soldering, wrong soldering, continuous soldering, or wrong wiring, especially do not connect the power cord to the output terminal by mistake.
2) Power on and statically check whether the indicator light, digital tube and display screen are normal, and whether the preset data is normal.
3) Qualified customers can use a small motor to conduct simulated dynamic tests.
4) Load test.
4. Handling improper function parameter settings
After the parameters are preset, the no-load test is normal, but an "overcurrent" trip occurs after loading. It may be that the starting torque setting is insufficient or the acceleration time is insufficient. In some cases, after running for a period of time, the moment of inertia decreases, causing an "over-voltage" trip during deceleration. This can be solved by modifying the functional parameters and appropriately increasing the acceleration time.
During the actual use of the inverter, it is still necessary to strictly follow the instruction manual or technical manual for operation. Avoid machine damage caused by unfamiliar operation.
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