29
2018
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08
Manufacturing and debugging process of electric control system
Author.
3. Fabrication of control cabinet and on-site construction
1) When making the control cabinet, the engineer shall first draw the power incoming wiring diagram of the PLC and the power supply wiring diagram of the output actuator;
2) Draw the layout of components in the electrical cabinet and the mutual wiring diagram; Draw the layout of control panel components.
3) If the power supply of PLC has interference, filter and isolation transformer shall be set. In addition, the engineer shall separate the signal line, power line and power line and use trunking or metal pipe for wiring.
4) Special attention shall be paid to the safe, correct, reliable, reasonable and beautiful installation, and the grounding of PLC shall be properly handled. Meanwhile, attention shall be paid to improving the anti-interference ability of the system, and attention shall be paid to fire and explosion prevention!
5) Selection of communication system:
PROFIBUS field bus has a long communication distance and is easy to expand, but the communication speed is slow and the amount of communication data is small; Industrial Ethernet has fast communication speed and large amount of data exchanged, but it has large communication distance and attenuation in long distance! The engineer finally integrates the lower computer and the upper computer into a DCS system!:
1) When making the control cabinet, the engineer shall first draw the power incoming wiring diagram of the PLC and the power supply wiring diagram of the output actuator;
2) Draw the layout of components in the electrical cabinet and the mutual wiring diagram; Draw the layout of control panel components.
3) If the power supply of PLC has interference, filter and isolation transformer shall be set. In addition, the engineer shall separate the signal line, power line and power line and use trunking or metal pipe for wiring.
4) Special attention shall be paid to the safe, correct, reliable, reasonable and beautiful installation, and the grounding of PLC shall be properly handled. Meanwhile, attention shall be paid to improving the anti-interference ability of the system, and attention shall be paid to fire and explosion prevention!
5) Selection of communication system:
PROFIBUS field bus has a long communication distance and is easy to expand, but the communication speed is slow and the amount of communication data is small; Industrial Ethernet has fast communication speed and large amount of data exchanged, but it has large communication distance and attenuation in long distance! The engineer finally integrates the lower computer and the upper computer into a DCS system!:
4. System commissioning
It mainly includes the following contents:
1) Cable wiring (coordinated construction with civil engineering in early stage)
2) Installation of instruments and sensors
3) Installation of local control cabinet and PLC cabinet
4) Wiring
5) Wiring inspection
6) Power on test shall be carried out for each equipment in the system one by one.
7) Set and calibrate the parameters of instruments and sensors.
8) Program simulation debugging
9) Program online debugging
10) Program parameter optimization and program archiving.
5. Preparation of technical documents
After successful system commissioning and operation test, the engineer will sort out technical data, prepare technical documents, including electrical schematic diagram, component list, software list, operation instructions, etc., and provide them to the owner!
6. Training customers
In order to facilitate customer operation and necessary maintenance, engineers will train customers at the end of each project until users can operate independently;
7. After sales service and transformation
The engineer shall provide the user with the fastest and most considerate service. At the same time, it shall be noted in the contract: "The engineer generally provides a two-year warranty period and lifetime maintenance. During the warranty period, if it is confirmed that the quality problem is, the engineer shall replace and repair it for free!".
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