Common faults of PLC control cabinet and their solutions

Common faults of PLC control cabinets and their treatment methods include:

1. Unable to start: Check whether the power input is normal, whether the output is normal, and check the control circuit around the PLC to see if there is a short circuit or bare wire causing power shock.
2. Poor control accuracy: Check whether the regulating valve is stuck, check whether the signal line is open, and check whether the servo amplifier is damaged.
3. Abnormal output signal: This may be due to interference or PLC internal circuit problems. Check whether the PLC peripheral circuits and their connections are normal.
4. Abnormal input signal: This may be due to interference or signal line impedance mismatch. Check whether the signal line is open or short-circuited.
5. Abnormal display of the display: Check whether the display is displayed normally and whether the power supply is stable; check whether the PLC input address and display address match, and whether the signal line is short-circuited.
6. Program abnormality: If the program is wrong or lost, the correct program needs to be uploaded again.
7. Hardware failure of the PLC itself: The PLC needs to be replaced or repaired.

In addition, when the control cabinet cannot be powered on, it is necessary to check whether the power module is working properly and whether the power output voltage is within the range; when the running speed is unstable, it is necessary to adjust the PID parameters and ensure that there is no external interference; when the movement direction cannot be switched or the switching process is slow, it is necessary to check whether the contacts, resistors and other components are normal.