Common Faults And Maintenance Methods Of Fully Automatic Shrink Packaging Machines

1, PLC malfunction: PLC malfunction mainly includes output point relay contact adhesion. If this point controls the motor, the fault phenomenon is that the motor runs after receiving a signal to start the motor, but when a stop signal is issued, the motor of the fully automatic shrink packaging machine does not stop running, only when the PLC loses power and the motor stops running. If this point controls the solenoid valve. The fault phenomenon is that the solenoid valve coil is not powered off and the cylinder is not reset. If external force is used to impact the PLC to separate the adhesive points, it can help determine the fault.

There are two ways to repair PLC output point faults. It is more convenient to use a programmer to modify the program, replace damaged output points with backup output points, and adjust the circuit at the same time. If point 1004 controlling the solenoid valve is damaged, the backup point will become point 1105. Programmers can find relevant statements at 1004, and keep (014) 01004 is keep (014) 01105. Control motor 1002 point is damaged, change to backup point 11061002 point related statement out 01002 to out 01106, and adjust the wiring at the same time.

If there is no programmer, a more troublesome second method can be used, which is to remove the PLC, dismantle the PLC, remove the output relay of the backup point, and replace it with a damaged output point. Then install according to the original line number.