1. Environment and Cleaning Maintenance: Eliminating the Primary Cause
Dust and moisture are the primary causes of electrical faults in rewinding machines. Daily precautions include:
Cleaning the electrical control cabinet weekly. Use compressed air to blow away dust from the cabinet interior, PLC, frequency converter, and filter surfaces. Keep the cabinet dry and well-ventilated. During the rainy season, place desiccants inside the cabinet to prevent moisture buildup.
Regularly check the electrical control cabinet's seal to prevent production water and raw paper dust from entering the cabinet, thus preventing insulation degradation and short circuits.
2. Regular Inspection of Key Components: Early Detection of Potential Problems
Perform preventative inspections of core electrical components periodically:
Power Supply and Circuit Boards: Monthly inspection of the bridge rectifier and the area around the 7805 voltage regulator for discoloration or bulging. Replace any abnormalities promptly to prevent sudden faults. Test the photoelectric protection function monthly to confirm its effectiveness.
Core Components of the Electrical System: Weekly inspection of the wiring and operating status of the PLC, frequency converter, and sensors. Perform dust and moisture control to identify loose terminals early. Safety Devices: Test the effectiveness of emergency stop buttons and photoelectric protection weekly; check the overload protection and limit switch functions of the gantry crane monthly to prevent malfunctions and ensure safety.
Communication and Transmission Components: Inspect the appearance of communication cables and terminating resistors quarterly, measure the resistance value of terminating resistors, and replace them promptly if they deviate from the nominal value to avoid sudden communication interruptions.
3. Wiring and Parameter Standards: Reduce Interference and Human-Induced Malfunctions
Standardized Wiring: Keep high-voltage and low-voltage lines separate and do not mix them in the same conduit to avoid electromagnetic interference that could cause PLC and communication malfunctions; ensure a reliable grounding system connection to reduce interference.
Parameter Management: Record any modifications to communication, tension, and other parameters to avoid parameter errors during subsequent debugging that could lead to human-induced malfunctions.
New Component Testing: After replacing power supply components such as bridge rectifiers, do not operate at full load immediately. First, conduct a no-load test to confirm that the voltage is normal to avoid short circuits that could burn out the new components.
4. Regular Replacement of Wear Components: Preventing Aging Failures
DC devices and power supply components should undergo aging assessments every 3-5 years based on the operating environment. Components showing signs of aging or poor heat dissipation should be replaced promptly to prevent sudden overvoltage and overcurrent failures.
Tension sensors should undergo accuracy calibration annually to prevent signal deviations that could lead to tension instability and affect product quality.
