How to solve the failure of the PLC control system of the packaging machine?
The PLC fault mainly has the contact adhesion of the output point relay.
If this point controls the motor, the fault phenomenon is that the motor runs after a signal is given to start the motor, but the motor does not stop running after the stop signal is sent out, (tissue paper box packing machine wholesales china)and the motor stops running only after the PLC powers off. If the point controls the solenoid valve. The fault phenomenon is that the solenoid valve coil is continuously powered, and the cylinder does not reset. If the method of hitting the PLC with an external force to separate the adhesion points can assist in judging the fault.
There are two maintenance methods for the failure of the PLC output point. The more convenient one is to use a programmer to modify the program, modify the damaged output point to a spare output point, and adjust the line at the same time. If the 1004 point of the control solenoid valve is damaged,(coffee packaging machine for sale china) change it to the backup point 1105 point. You can use the programmer to find the relevant statements at point 1004, keep(014)01004 is keep(014)01105. The 1002 point of the control motor is damaged, change it to the spare point 1106, modify the related sentence of 1002 point out 01002 to out 01106, and adjust the line at the same time.
If there is no programmer, you can use the troublesome second method, dismantle the PLC, disassemble the PLC, remove the output relay of the backup point and replace it with the damaged output point. Then install according to the original line number.