Here's a professional translation of the content, maintaining technical accuracy and logical flow: For those who have used lifting machinery, it's no surprise that stage electric hoists may encounter faults. However, many novices feel at a loss when facing malfunctions. Tianjin Kemei will analyze three common faults of stage electric hoists and guide you on how to address them.
(1) Power Supply System Issues
- Check if power is supplied to the hoist: Use a test pencil to verify power input. If no power is detected, wait until the supply is restored before operating. - Faulty main/control circuit components or loose connections:
These can cut off power to the hoist motor. To fix this: - Disconnect the hoist motor from the power line to prevent phase loss (which could burn the motor) or sudden motor activation. - Only power the main and control circuits, then momentarily press the start/stop switches to inspect control appliances and wiring. - Repair or replace faulty components. Resume testing only after confirming the main/control circuits are fault-free.
(2) Motor Voltage Abnormality
- If the motor's terminal voltage is 10% lower than the rated voltage, the starting torque will be too low to lift the load. Use a multimeter or voltmeter to measure the voltage. If low voltage is the cause, wait for the system voltage to return to normal.
- Other potential causes when voltage is normal:
- Burned motor: Replace the motor.
- Rusted brake wheel and end cover:
If the hoist hasn't been maintained for a long time, the brake wheel may stick to the end cover, causing the motor to hum without rotating. Remove the brake wheel, clean the rusted surface, and retest.
- Severe core rubbing: Stop use immediately and overhaul or replace the motor.
- Overloading: If the hoist can't lift the load and the motor hums, immediately reduce the load to operate within the rated capacity-failure to do so may burn the motor or cause accidents.
Key Safety Notes:
- Always disconnect the motor from the power source during circuit repairs to prevent unexpected activation. - Use professional tools (e.g., test pencils, multimeters) for diagnostics and follow manufacturer guidelines for maintenance.