When an explosion-proof electric hoist is not working, the following steps can be taken to troubleshoot and resolve the issue:

1. Power Supply Check

Verify Voltage: Use a multimeter to measure the input voltage at the terminal block to ensure it is normal, balanced, and free from phase loss.

Check Fuses and Circuit Breakers: Inspect the thermal relays, fuses, and motor protection devices for tripping or melting. Reset or replace as necessary.

2. Control System Inspection

Control Circuit Check: Examine the control circuit for loose connections, damaged buttons, relays, or contactors. Test the continuity of the control wiring.

Remote Control Functionality: Test the remote control or pendant controller to ensure all buttons are responsive and functioning correctly.

3. Mechanical Component Examination

Manual Rotation Test: Disconnect the power and manually rotate the motor shaft using a tool (e.g., wrench) to check for mechanical binding or damage to bearings, load, or windings.

Hook and Chain Inspection: Check the hook for deformation, cracks, or excessive wear. Ensure the lifting chain is free from kinks, fraying, or broken strands.

4. Motor and Winding Assessment

Winding Resistance Measurement: Use a megohmmeter to measure the insulation resistance between windings and ground, and a multimeter to check the DC resistance of the three-phase windings for balance and continuity.

Overheating Check: Inspect the motor for signs of overheating, such as discoloration or burnt insulation, which may indicate winding faults.

5. Safety Device Verification

Overload Protection Test: Verify that the overload protection device activates when the hoist is subjected to a load exceeding its rated capacity. Reset or replace if faulty.

Limit Switch Functionality: Check that the upper and lower limit switches are functioning correctly by manually operating the hoist and ensuring it stops at the designated limits.

6. Environmental and Operational Factors

Hazardous Area Compliance: Ensure the hoist is used in an environment classified for its explosion-proof rating (e.g., Class I, Division 1 for explosive gases).

Load Capacity Check: Confirm that the actual load does not exceed the hoist's rated capacity to prevent overloading.

7. Professional Maintenance and Repair

Qualified Personnel: Engage certified technicians with expertise in explosion-proof equipment to perform repairs or maintenance.

Component Replacement: Replace damaged or worn-out parts, such as motors, control boxes, or chains, with genuine components that meet explosion-proof standards.

8. Documentation and Compliance

Maintenance Records: Keep detailed records of all inspections, maintenance activities, and repairs for future reference and compliance audits.

Certification Verification: Ensure the hoist has valid explosion-proof certification and complies with relevant standards (e.g., ATEX, IECEx, NEC).

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment