How to solve the problem of the crane motor burned out?

1, jib crane  motor phase reasons:

A, contactor frequent start soon ablation, spring contacts, the contact at the burning plastic deformation which would make contact position enough, resulting in phase.

B, fuses

1, phase reasons:

A, contactor frequent start soon ablation, spring contacts, the contact at the burning plastic deformation which would make contact position enough, resulting in phase.

B, causing fever blown fuse is too small phase;

C, power supply caused by poor contact phase;

D, poor motor line contactor.

E, install automatic empty open higher sensitivity and thermal overcurrent protection devices, installation phase controller can effectively prevent it.

2, in addition to the gantry crane  motor phase, there are reasons for burning motor

A, the load is too heavy

B,  eot crane  motor bearing damage;

C, brakes not working, when in operation, there is no solenoid disengaged or poor contact, causing sometimes down, locking brake drum.