Moisture damage and malfunctions in the extruder electrical system during downtime can lead to costly repairs, production delays, and safety risks. This article outlines the symptoms, core causes, and solutions to address electrical system failures caused by moisture and aging.

I. Signs of Electrical System Failure in Twin-Screw Fish Feed Making Machine

Early identification of electrical failures caused by moisture and aging can prevent major operational disruptions.

1. Moisture and Malfunction Symptoms

Failure to start: The system cannot power up or starts erratically.
Control cabinet issues: The electrical cabinet trips or short-circuits unexpectedly.
Sensor malfunction: Temperature, pressure, and level sensors show abnormal readings or fail to function.
Motor and valve issues: Motors and solenoid valves do not respond properly to control signals.
Condensation and rust: Visible condensation and rust on wiring and terminals, leading to poor electrical contact and potential failure.

2. Aging and Abnormal Symptoms

Control interface issues: The control interface display becomes disorganized or loses parameters.
Inverter and PLC malfunctions: The inverter or PLC fails to adjust speed or temperature properly.
Component failure: Relays, contactors, and other electrical components stick or burn out.
Wiring degradation: The insulation on wires cracks or ages, leading to a higher risk of electrical leakage or fire.

📊 Summary Table: Symptoms of Electrical System Failures

Failure Type	Observed Symptoms	Impact
Moisture Damage	Failure to start, tripped cabinet, sensor malfunctions	Equipment failure, production downtime
Aging	Disorganized interface, inverter/PLC malfunctions, component burnouts	Reduced efficiency, safety risks
Rust/Corrosion	Condensation, rust on wiring	Poor electrical contact, possible failure

II. Cause of Electrical System Failure in Twin-Screw Sinking Fish Feed Making Machines

Understanding the underlying causes allows for effective moisture damage prevention and long-term system stability.

1. Humid Storage Environment (Most Important Cause)

High humidity (>70%): Condensation forms inside electrical cabinets, damaging components.
Exposure to rain: Equipment stored outdoors or without protection is directly exposed to water.
Temperature fluctuations: Large temperature changes cause condensation to accumulate on electrical parts.
Dust and corrosive gases: Environments with dust and corrosive gases accelerate wear and damage to electrical components.

2. Improper Protection and Maintenance

Unsealed electrical cabinets: Cabinets left open or improperly sealed allow moisture and dust to enter.
No moisture-proof devices: Lack of dehumidifiers or moisture-proof agents results in a prolonged humid environment.
Inadequate shutdown procedures: The main power supply is not disconnected, leaving components energized and accelerating aging.
Neglected inspections: Electrical cabinets were not regularly cleaned or inspected, leading to dust buildup and moisture absorption.

3. Natural Aging of Electrical Components

Long-term storage (>6 months): Extended downtime causes degradation of electronic components, leading to failure.
Worn insulation: Circuit insulation cracks and degrades, causing the loss of its insulating properties.
Oxidized components: Relays and contactor contacts oxidize and stick, leading to poor electrical contact.
Sensor drift: Sensors lose accuracy over time, leading to inaccurate readings and malfunctions.

4. Improper Shutdown Procedures

Open electrical cabinets: The doors and windows of the cabinet were left open during shutdown, exposing components to environmental elements.
Lack of protective treatment: Electrical systems were not treated with moisture-proof or dust-proof coatings.
Failure to power off: Failure to disconnect the main power supply caused components to stay energized, leading to moisture absorption.

📊 Summary Table: Causes of Electrical System Failures

Cause Category	Key Issues	Impact
Humidity	High humidity, exposure to rain, temperature fluctuations	Condensation, corrosion, system failure
Improper Protection	Unsealed cabinets, no moisture-proofing	Accelerated aging and degradation
Component Aging	Long-term storage, insulation wear	Malfunctions, safety hazards
Shutdown Errors	Open cabinets, failure to disconnect power	Moisture absorption, component failure

III. Targeted Solutions for Electrical System Moisture Damage and Malfunction

To prevent and repair moisture damage in electrical systems, these targeted solutions will ensure safe, long-term operation.

1. Emergency Repair for Moisture and Malfunction

Disconnect power immediately: Prevent further damage by disconnecting the power supply.
Dry the electrical cabinet: Open doors and windows, and use a dehumidifier or fan to dry the area.
Clean rust and dust: Use specialized cleaning tools to remove rust and dust from wiring terminals and components.
Replace damaged parts: Replace damp or damaged sensors, relays, and wiring.
Test insulation performance: After drying, test insulation to ensure it meets safety standards before applying power.

2. Electrical Protection and Drying After Shutdown (Core Prevention)

Seal electrical cabinets: Close all electrical cabinet doors and windows for protection.
Moisture-proof agents: Place desiccants and moisture-proof agents inside the cabinets to absorb excess moisture.
Disconnect the power supply: Disconnect the main power supply to prevent components from being energized.
Comprehensive inspection: Before long-term storage, conduct a thorough inspection of the electrical system, repairing any aging components.

3. Maintenance Measures for Twin-Screw Dog Food Maker Machines During Storage

Monthly system power-on: Run the system for 10–15 minutes monthly to remove accumulated moisture.
Bi-weekly cabinet inspection: Inspect the electrical cabinet every two weeks and replace the desiccant.
Dust cleaning: Regularly clean dust inside the electrical cabinet to ensure dry conditions.
Wiring inspection: Inspect wiring insulation for cracks or aging, and repair any damaged areas.

4. Long-Term Management Mechanism

Maintenance log: Keep a detailed log of all electrical system maintenance, including drying and testing status.
SOPs for moisture prevention: Develop and implement SOPs for electrical moisture control and regular power-on.
Training: Train operators on proper shutdown, maintenance, and dehumidification procedures.
Dehumidification devices: Install dehumidifiers and temperature control devices to optimize the storage environment.
Component replacement: Regularly replace aging electrical components to ensure the system remains stable.

📊 Summary Table: Solutions for Moisture Damage Prevention and Repair

Solution Area	Key Actions	Result
Emergency Repair	Disconnect power, dry, clean rust, replace parts	Restore functionality, prevent further damage
Protection After Shutdown	Seal cabinets, use moisture-proofing agents	Prevent moisture buildup, prolong component life
Regular Maintenance	Monthly power-on, bi-weekly inspection, dust cleaning	Maintain dry, operational environment
Long-Term Management	Maintain logs, train operators, install dehumidifiers	Ensure long-term system reliability

Conclusion

Damage to the electrical system of a small sinking fish feed extruder machine due to moisture or malfunctions during downtime can cause severe production disruptions.. By implementing effective moisture prevention, regular maintenance, and proper shutdown procedures, you can extend the lifespan of electrical components and reduce downtime.

Ensure proper sealing, use moisture-proof agents, and conduct monthly inspections to keep your system in top condition. A well-maintained electrical system ensures safe, reliable, and efficient operations.