Control system maintenance of spraying equipment
Customer: Huizhou Plastic Hardware Products Co., Ltd.
Name: spraying equipment control system
Model: SIEMENS S7-200 and weinview touch screen
Causes of failure: PLC and touch screen can not communicate
Failure analysis: customers call that the spraying equipment in the normal work of the touch screen alarm can not communicate. Is not sure to touch screen or PLC fault. To the scene after the observation of the normal voltage 24V. In the detection of communication lines is also normal. Description of the fault occurs on the PLC and touch screen. Back detection of the touch screen and PLC were on the electricity and PC PC communication found that the touch screen can communicate normally, SIEMENS PLC can not communicate. Description for PLC fault. Open the shell to find communication IC power supply voltage 5V normal. RS232 communication 3-4 pin without voltage measurement of static resistance is more than and 100 ohms. Change the voltage on the IC communication is normal, and touch screen connection after all normal. The spraying equipment for mobile phone shell spraying equipment, the main problems may be due to the cabinet ventilation fan does not turn, electric cabinet temperature is too high and the lack of maintenance, in 24 hours of non-stop work in the staff often open the electric door adjusting the frequency of transducer. The door opens to pull the communication line connecting the touch screen and the PLC. A relatively short time to pull the factory itself line PLC connection communication port often resulted in the failure of hot plug.
No show, short circuit trip, communication failure, program or frequency converter fault, no temperature control, alarm fault and other faults can be repaired.
Jia Hong Wei maintenance hotline: 13640994287 075528916839 Shaw