The electric gourd can only go down
Most of the faults are missing or broken Bad contact with a broken firearm. If the motor sound is abnormal, there is a lack of phase
Electric hoist is a cone-shaped motor, lack of phase, the motor rotor is not, of course, sling wheel, and you won't come wire roller will not turn, absolutely is not caused by lack of phase, the electric hoist motor line picked, just try to control, see if contactor action, and then measure the terminal voltage under the contact the main contact, especially the "up" contactor in line all measure, whether there is loose...
Then you can put the top limit short, let it temporarily lose its protective effect, and you can eliminate the problem of the limit. If it's like what you're talking about up the contactor. Do you see if the main loop of the ascending contactor is the same as the falling contactor? You have to have two swaps to reverse the motor. Is the voltage between the three lines 380 volts? Is that the ABC 3 phase?
The electric gourd will not only be inspected by the limiter. It is usually because the limiter cuts off two of these phases, not the upward movement. So we need to check the limit. Also, lack of phase is easy to judge!
