Causes of electrical system failure

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Release time:

2021-10-28

Cause of electrical system failure

Because the crane in the normal operation, the resistance group in the resistance box is put into operation most of the time, which generates a lot of heat, so that the temperature of the resistance group is higher. In a high temperature environment, both the resistor itself and the resistor connection terminal are susceptible to deterioration. At the same time, the bridge crane in the working process of a variety of AC contactor switching frequency is particularly high, the contact is easy in the frequent switching damage, aging, resulting in part of the contact resistance becomes larger or lack of phase phenomenon, so that the motor winding series resistance value imbalance. As a result, the crane will cause damage to the motor when it is heavily loaded or working for a long time.

prevention and exclusion

Whether it is the main motor series resistance value imbalance or three voltage imbalance, the motor will appear or long or short, or strong or weak abnormal sound and other abnormal phenomena. If the drive motor produces a high temperature rise in a short period of time, the motor will shake violently, and the crane can produce a "weakness" phenomenon; the brake pads of the motor will collide with each other, issuing high-frequency, unstable friction sound, and the motor will be damaged over time. At this time, it should be stopped immediately for timely maintenance and inspection. In order to prevent such accidents, maintenance workers should be organized regularly to check and maintain the resistance box and control box. Strengthen the inspection of vulnerable parts of power supply sliding contact line system, timely repair or regular replacement of power receiver. Regularly or frequently check the sliding contact line guide rail and shift fork state, adjust the floating suspension clamp, so that the catheter can freely expand and contract. In addition, it is necessary to frequently check the fixing bolts and terminals of electrical components, install spring pads or anti-vibration rubber pads, reasonably arrange the power supply circuit of the crane during installation, and avoid connecting other power supply equipment with higher power on the dedicated circuit.

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