There are many soft problems in inverters, which are also one of the problems that generally exist in the operation of various types of inverters. So how can we reduce the occurrence of soft problems in inverters? This is a problem that all inverter manufacturers and users are very concerned about. More on that below.
The ways to reduce the soft problems of the inverter are: 1. Detect the overvoltage and undervoltage of the inverter; 2. Detection of overcurrent is the most frequent phenomenon of frequency conversion alarm.
Usually, the overvoltage alarm generally appears at the time of shutdown, and the primary reason is that the deceleration time is too short or there is a problem with the braking resistance and braking unit. Undervoltage is also a problem that we often encounter in application. First of all, because the main circuit voltage is too low (220V series is lower than 200V, 380V series is less than 400V), the primary reason: a rectifier bridge is damaged or there is abnormal operation in the three thyristor circuits, which may lead to undervoltage problems, and secondly, the main circuit contactor is damaged, resulting in DC bus voltage loss on the charging resistor, which may lead to undervoltage. There is also a problem of undervoltage due to the fault of the voltage detection circuit.
The main manifestations of overcurrent are as follows:
(1) When starting from the beginning, it trips as soon as the speed is raised. This is a very serious phenomenon of overcurrent. The primary reasons are: short circuit of load, stuck mechanical parts; The inverter module is damaged; The torque of the motor is too small.
(2) Jump when power on, this phenomenon generally cannot be reset, the primary reasons are: bad module, bad drive circuit, bad current detection circuit.
(3) When starting from the beginning, it does not trip immediately but accelerates, the main reasons are: the acceleration time is set too short, the upper current limit is set too small, and the torque compensation (V/F) is set high.
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