Overhead Crane Electrical System Failures and Repair: Electrical Equipment, Electrical Control and Circuit

Overhead cranes are widely used in industrial settings, and the failures and repairs of overhead crane electrical systems are of critical importance. The performance of these systems is directly tied to the safety and efficiency of crane operations. This article will explore the common causes of overhead crane electrical system failures and repair methods. By understanding these issues, operators can better prevent and address potential problems, ensuring stable equipment operation and smooth production processes.

Overhead Crane Electrical Equipment Failures and Repair

This section covers the failures and repairs of AC motors, AC electromagnets, AC contactors, and relays.

1. AC Motor Failures and Repair

2. AC Electric Magnet Failures and Repair

Overheat of loop

• Cause: Overload of magnetic iron force
• Repair: Adjust the spring pulling force
• Cause: The fixed part and stationary part of the closed circuit have a gap
• Repair: Eliminate gap
• Cause: Loop voltage and power voltage do not match
• Repair: Replace loop or change connection method

Too noisy when working

• Cause: Magnetic iron overload
• Repair: Adjust the spring
• Cause: Dirt on the magnetic flow circuit surface
• Repair: Clean dirt
• Cause: Deflection of magnetic system
• Repair: Adjust mechanical part of brake and eliminate deflection

Unable to overcome the spring force

• Cause: Magnetic iron overload
• Repair: Adjust the main spring of break
• Cause: Spring force is too big
• Repair: Adjust the main spring of break
• Cause: Low voltage
• Repair: Stop working

3. AC Contactor and Relay Failures and Repair

Overheat of loop

• Cause: Loop overload
• Repair: Reduce the pressure that the movable terminal acts on the fixed terminal
• Cause: Magnetic flow movable part cannot come into contact with fixed part
• Repair: Eliminate deflection jamming, dirt, or change loop

Contact too noisy

• Cause: Loop overload, dirt on magnetic flow surface
• Repair: Reduce contact pressure, clean dirt
• Cause: Magnetic flow self-adjust system jamming
• Repair: Eliminate jam

Contact overheat or burned

• Cause: Contact lacks pressure
• Repair: Adjust pressure
• Cause: Contact is dirty
• Repair: Clean or replace

Main contact cannot connect

• Cause: Switch not closed, EM switch not closed
• Repair: Close switch
• Cause: Upper door switch not closed
• Repair: Close switch
• Cause: Control stick is not at 0 position
• Repair: Put lever to 0 position
• Cause: Control circuit fuse burned
• Repair: Check or replace fuse
• Cause: No power in circuit
• Repair: Check if voltage is on

Power-off protection happens frequently

• Cause: Contact pressure is not enough
• Repair: Adjust contact pressure
• Cause: Contact burned
• Repair: Replace or grind contact
• Cause: Contact is not clean
• Repair: Clean
• Cause: Working overload, over current
• Repair: Reduce current load
• Cause: Slide wire is not parallel, loose contact between current collector and slide wire
• Repair: Adjust the rail or wire

Contact too slow

• Cause: Clearance of magnet pole surface is too large
• Repair: Shorten pole surface clearance
• Cause: Upper part of base plate is more protruding than lower part
• Repair: Install parts vertically

Overhead Crane Electrical Control and Circuit Failures and Repair

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Overhead Crane Electrical System Failures and Repair

In conclusion, maintaining the electrical system of an overhead crane is crucial for ensuring smooth and efficient operations. Regular inspections and timely repairs of electrical equipment, control systems, and circuits help minimize downtime and extend the lifespan of the crane. By addressing issues promptly and using quality components during repairs, companies can significantly reduce the risk of unexpected failures. A proactive approach to crane maintenance, including electrical system upkeep, not only improves safety but also enhances productivity, ultimately supporting the overall efficiency of operations in various industries.