Common faults and treatment methods in LG PLC maintenance - News - Global IC Trade Starts Here.
1. When comparing the input signal LGplc, first check the status shown on the LGplc programmer and compare it with the LED indications on the input module. If there is a discrepancy, replace the input module. If multiple modules are found to be faulty, inspect the I/O extension cables and their connections before replacing them. This ensures that the issue isn't due to a loose or damaged cable. 2. If the LGplc signal stops moving in one position, this often indicates that the output is active. The signal may be in an intermediate state. During repairs, identify the next possible cause—such as a timer, line Chuan, input, or drum controller—and use the programmer to check its on/off status. 3. If the input state matches the LED indication on the module, then verify the actual input device (like a button or limit switch) against the LED. If they don’t match, measure the input module for faults. If a problem is found, ensure the site is properly wired or powered before replacing the I/O device. Otherwise, replace the input module. 4. During LGplc maintenance, if the signal is "line" and the output doesn’t match the expected state or shows no output, use the programmer to check the output drive logic and review the program list. Inspect from left to right to find the first disconnected contact. If the issue is an input, follow steps 2 and 3. If it’s a line Chuan, proceed to steps 4 and 5. Always make sure the master control relay does not interfere with the logic flow. 5. If the signal is controlled by a counter, first check the reset logic, then verify the counter signal. Follow steps 2 through 5 accordingly. Common frequency settings include analog input, fixed frequency, and communication-based inputs. 6. If the LGplc signal is a timer and it stops at a value less than 999.9 but not zero, the CPU module must be replaced. This usually indicates a hardware failure within the CPU itself.
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