During the no-load trial operation of the asphalt mixer, the machine suddenly tripped, and the problem of starting again still existed. This can make users anxious, and the work process will be delayed. The problem must be overcome as soon as possible.

In this case, the only option is to try to replace the thermal relay of the asphalt mixer with a new one, but the problem is still not solved; and the contactor, motor phase resistance, grounding resistance, phase voltage, etc. are checked, but no problems are found; remove it The transmission belt and starting vibrating screen are all normal, which shows that the fault of the asphalt mixer is not in the electrical part.
I could only reinstall the transmission belt and restart the vibrating screen, only to find that the eccentric block was beating more violently. After replacing the vibrating screen bearing, installing the eccentric block, and restarting the vibrating screen, the ammeter indication became normal and the machine's tripping phenomenon disappeared.