1. Voltage circuit breaker problem
The contact is overheated, you can smell the power distribution control cabinet, by checking that the moving contact is not completely inserted into the static contact, and the contact pressure is not enough, resulting in a decrease in the switching capacity, causing the contact to overheat. At this moment, the operating organization should be adjusted so that the moving contact is completely inserted into the static contact.
When the power is on, the flashing arc explosion is caused by the load being too heavy for a long time, the contact is loose and the contact is poor. To repair this problem, we must pay attention to safety and strictly prevent the harm of arc to people and equipment. After overhauling the load and contacts, the no-load power is normal, and then the load can be brought to check the operation until it is normal. This problem must pay attention to the daily maintenance of the equipment to avoid unnecessary harm.
2. Problems with contactors
Contact phase break, due to a phase contact contact is not good or the screw on the terminal is loose, so that the motor runs out of phase, although the motor can rotate at this moment, but it makes a buzzing sound. The vehicle should be parked immediately for maintenance.
The contact is fusion welded, and the "abort" button is connected, and the motor does not stop, and there may be a buzzing sound. This kind of problem is the fusion welding phenomenon caused by the large overload current of the two-phase or three-phase contact, which should be powered off immediately and the contactor should be replaced after checking the load.
The energized armature does not engage. If there is no vibration and noise after checking the power-on, it means that the moving part of the armature is stuck along the edge, and only the coil is broken. The coil can be removed and wound from scratch according to the original data, and then dipped in paint and dried.
3. Thermal relay problems
If the thermal work equivalent element is burned, if the motor cannot be started or there is a humming sound when it is started, it may be the fuse wire in the thermal element of the thermal relay. The cause of this problem is that the frequency of operation of the thermal relay is too high, or an overload occurs on the negative side. After eliminating the problem, replace the appropriate thermal relay and adjust the setting value from scratch after paying attention.
The thermal relay "misoperates". The reasons for this problem are generally as follows: the setting value is small, resulting in action without overload; The motor starts for too long, so that the thermal relay acts during the start-up process; The frequency of operation is too high, so that the hot element is often subjected to shocks. Adjust the setting value from scratch or replace it with a suitable thermal relay treatment.
The thermal relay "does not" act. This kind of problem is usually that the current setting value is too large, resulting in overload for a long time and still does not act, and the setting current should be adjusted according to the load operation current.
Thermal relays have been used for a long time, and their operational reliability should be checked regularly. When the thermal relay trips, it should be reset after the bimetal sheet has cooled down. Press the reset button not too hard, otherwise it will damage the operating tissue.
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