Engineering machinery electrical control system maintenance precautions - Solutions - Huaqiang Electronic Network

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As the electrical systems in construction machinery become increasingly complex, even small oversights during maintenance can lead to major failures, resulting in costly repairs and downtime. To ensure safe and effective maintenance, follow these essential guidelines:

1. Always disconnect the power supply before working on any wiring or connectors. Failing to do so may cause damage to wires, fuses, or even result in dangerous short circuits that could lead to serious accidents.

2. Properly identify wire colors. Imported equipment often uses a color-coding system to differentiate between wires. For example, "R" stands for red, "W" for white, "L" for blue, and so on. Understanding this code is crucial for accurate troubleshooting and repair.

3. When handling terminal connectors, always grasp the connector itself, not the wire. Make sure to release any locking mechanisms before pulling apart the connection. For waterproof connectors, avoid moisture exposure and dry thoroughly before reconnection.

4. Use circuit testing instruments correctly. Before measuring voltage or current, familiarize yourself with the device's operation and select the appropriate range. Avoid damaging the meter by ensuring proper setup and calibration.

5. Understand the electrical schematic diagram. This document shows how components are connected and how the system operates. Recognizing the function of each part helps prevent unnecessary disassembly and speeds up the diagnostic process.

6. Identify all ground points accurately. In construction machinery, the negative terminal of the battery is typically grounded, and the machine’s frame also serves as a ground. However, with modern electronics, some components may have their own internal grounding, which should be considered during measurements.

7. Keep detailed records during repairs. Many parameters are measured during maintenance, and without proper documentation, it's easy to lose track of important data. Keeping a log ensures better troubleshooting in the future and provides valuable technical history.

8. Handle wiring harnesses with care. Avoid sharp bends or folds that could damage the cables. Keep them away from moving parts, oil, and water to prevent wear and tear.

9. Inspect and replace damaged wires promptly. If a wire is worn or frayed, wrap it with insulation tape or replace it entirely. Water-resistant tape is recommended for added protection in wet conditions.

10. Use the correct fuse specifications when replacing fuses. Never substitute with copper wire unless absolutely necessary, and use the thinnest possible wire to prevent further damage in case of a fault.