Mitsubishi inverter fault detection method

1. The output side of the inverter is short-circuited, such as the connection line between the output end and the motor, or the short circuit inside the motor, etc.;

2. The inverter itself is not working normally, such as the two inverter equipment of the same bridge arm in the inverter bridge are constantly alternating in the working process. For example, due to the high ambient temperature or the aging of the inverter equipment itself, the parameters of the inverter equipment change, resulting in the alternation process, one equipment has been turned on, while the other equipment has not yet had time to shut down, resulting in the "straight through" of the upper and lower two devices of the same bridge arm, so that the positive and negative poles of the DC voltage are in a short circuit condition. 2. When the inertia of the load is large, and the time of the increase is set too short, it means that in the process of speed-up, the working efficiency of the inverter rises too fast, and the synchronous speed of the motor rises quickly, and the speed of the rotor of the motor cannot keep up because of the load inertia, and the result is that the speed of the speed-up current is too large. 3. Overcurrent in the speed reduction.

Mitsubishi inverter fault detection method

Mitsubishi inverter fault detection method

3. The current faulty circuit board is generally tightly structured, the degree of integration is very high, the signal flow is scattered and complex, and any equipment damage may form a fatal problem. Because the equipment is highly integrated, the maintenance personnel are required to pay more attention to the common sense of equipment and equipment test compared with the common sense of circuits.

4. There are many strange problems in the circuit board, such as: deterioration of integrated IC characteristics, functional failure, false soldering of pins, short circuit, broken circuit board connection, electromagnetic signal disturbance, environmental dust influence and program loss, etc., can lead to problems, so all kinds of situations need to be considered. Because the problem is complex, it is not only necessary to analyze and test the equipment, but also require the repair personnel to enhance the comprehensive judgment ability of the problem. To sum up, today's excellent circuit repairers are by no means the so-called craftsmen who "are unwilling to do it, and Lai Han can't do it" in the past, but compound repair experts who have high requirements for all aspects of their essence.

Anything that seems complex has a regularity to its connotation, and the same is true for circuit board faults. For example, when you encounter a fuse burning problem, you will naturally think that there may be a short circuit in the power supply. Because a large current is required to blow a fuse, the power supply circuit is closely connected to the fuse, which is first of all questionable. The phenomenon of the problem and the cause of the formation have a connotative connection in this way, and it has its own regularity.

Mitsubishi inverter fault detection method

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