Overhead Crane Electrical System Maintenance and Troubleshooting Methods
Crane electrical systems is a more complex part of the overhead crane maintenance, electrical in the impact, vibration and oscillation of the working conditions of the operation, easy to eot crane electrical failure, especially in the high temperature, dusty, humid and other harsh environments, it is more likely to fail and may cause accidents. When maintaining the bridge crane electrical system, we need to pay attention to all aspects to ensure the reliability and safety of the equipment.
Crane electrical system failure causes and maintenance
| Failure Phenomenon1: Close the power switch, press the button, the contactor is not absorbed, the crane can not be started | |
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Cause of Failure:
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Maintenance treatment:
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| Maintenance measures:Check whether the contact of each electric appliance (cam controller or master command controller, linkage controller and contactor, etc.) is normal, whether the current passes normally, and whether the handle position is returned to the position. | |
| Failure Phenomenon2: After closing the power switch, press the button, the contactor is absorbed, but the overcurrent relay operates | |
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Cause of Failure: Cam controller has a ground fault |
Maintenance treatment: Use a multimeter and megohmmeter to check cam controllers one by one, to find and eliminate ground faults |
| Maintenance measures:Check whether the cam controller contacts have burnt hair phenomenon, if necessary, must be timely with metallurgical sandpaper grinding and even replace the contacts after use. | |
| Failure Phenomenon3: The power supply has been turned on, the contactor has been operated to absorb, but the motor does not rotate after the cam controller is awesome zero position. | |
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Cause of Failure:
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Maintenance treatment:
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| Maintenance measures:Check whether the contacts of each electric appliance (cam controller or master command controller, linkage controller and contactor, etc.) have burnt hair phenomenon, if necessary, it must be promptly sanded with metallurgical sandpaper and even replace the contacts after use. | |
| Failure Phenomenon4: Motor brushes produce sparks exceeding the specified level or the slip rings are burnt. | |
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Cause of Failure:
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Maintenance treatment:
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| Maintenance measures:Regularly check the slip ring, carbon brush holder, long time use will appear collector ring or brush abnormal wear and tear, brush vibration and produce sparks and other ills | |
| Failure Phenomenon5: High sparks and severe burns between the movable and static contacts of the cam controller | |
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Cause of Failure: Improper contact pressure or burrs on cam controller moving and static contacts |
Maintenance treatment: Adjust contact pressure, deal with burrs, or replace movable or static contacts. |
| Maintenance measures:Check whether the contacts of each electric appliance (cam controller or master command controller, linkage controller and contactor, etc.) have burnt hair phenomenon, if necessary, it must be promptly sanded with metallurgical sandpaper and even replace the contacts after use. | |
| Failure Phenomenon6: Insufficient motor output, slow speed | |
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Cause of Failure:
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Maintenance treatment:
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| Maintenance measures:Check whether the dragging motor of each organization is overheated at any time, and observe the operation of the motor frequently to see if there is any abnormality. | |
| Failure Phenomenon7: Armature does not reset after the solenoid is de-energized | |
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Cause of Failure:
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Maintenance treatment:
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| Maintenance measures:Clean internal parts, observe wear and tear on motor parts (e.g., brush holders and slip rings), and check for abnormal sounds during operation. Check and repair controls and switch contacts as needed. | |
| Failure Phenomenon8: Problems such as the crane not being able to stop during operation or swaying when stopped | |
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| Cause of Failure:Brake failure | Maintenance treatment:Replacement of brakes |
| Maintenance measures:Check the working condition of the brake and replace it if there is any problem. | |
The above recommendations should be adapted to the specific bridge crane model and manufacturer’s recommendations. When carrying out maintenance, please ensure that the work is performed in accordance with the relevant safety regulations and standard operating procedures. Degong Crane has professional electrical engineers, so if you have any problems, you can seek help from us.
Zora Zhao
Expert in Overhead Crane/Gantry Crane/Jib Crane/Crane Parts Solutions
With 10+ years of experience in the Crane Overseas Export Industry, helped 10,000+ customers with their pre-sales questions and concerns, if you have any related needs, please feel free to contact me!