Switching power supply common fault repair - Database & Sql Blog Articles

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First, the fault phenomenon: The power-on indicator light does not turn on. Check the contents: Ensure that the power supply is properly connected, the circuit breaker is closed, and check for any phase loss in the three-phase power supply. Remedy: Reconnect the power supply and close the circuit breaker. Second, the fault phenomenon: The power indicator is normal, the fan is running, but the work indicator is off. Check the content: Verify if the start switch is in the correct position. Method of exclusion: If the start switch is in the start position but the system doesn’t operate, try switching it back and forth to reset. Third, the fault phenomenon: The work indicator is on, but the current and voltage cannot be adjusted. Check the contents: Confirm that the voltage limit, current limit, and steady voltage knob are set to the minimum position. Exclusion method: Adjust the knobs according to the plating process requirements to the appropriate positions. Fourth, the fault phenomenon: During operation, the current output suddenly stops, but the work indicator remains on. Check the content: Inspect the connection between the power output and the plating tank. Exclusion method: Replace or reconnect the cable if a disconnection is found. Fifth, the fault phenomenon: During operation, there is no current output, and the protection indicator flashes. Check the content: 1. Check if the working environment temperature is too high and whether the fan is operating normally. Exclusion method: Fix the fan failure and improve the ventilation conditions. Check the content: 2. Determine if the instantaneous overcurrent protection has been triggered. Method: Press the boot program to restart the machine and see if it operates normally. Check the content: 3. Ensure the input voltage is stable—check for overvoltage, undervoltage, or phase loss. Exclusion method: After fixing the power line issue, restart the system using the startup procedure. Check the content: 4. Inspect the power rectifier diodes for short circuits. Exclusion method: Replace the faulty rectifier diode. Check the content: 5. Check if the power device or input rectifier module is damaged. Exclusion method: Replace the same type of power device and check the drive circuit. If necessary, replace the input plating rectifier module. Sixth, the fault phenomenon: Even after following the normal operation procedure, the protection indicator still flashes. Check the content: 1. Check if the working environment temperature is too high and whether the fan is functioning properly. Exclusion method: Repair the fan and improve the ventilation. Check the content: 2. Determine if the instantaneous overcurrent protection is active. Method: Press the boot program to restart the machine and check if the power supply works correctly. Check the content: 3. Confirm that the input voltage is stable—no overvoltage, undervoltage, or phase loss. Exclusion method: After resolving the power distribution issue, restart the system using the correct startup procedure. Check the content: 4. Inspect the power rectifier for any short circuits. Exclusion method: Replace the rectifier if necessary. Check the content: 5. Evaluate the condition of the power device. Exclusion method: If the input rectifier module is damaged, replace it with the same model and check the drive circuit. If needed, replace the input plating rectifier module.

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