The ways to reduce the soft fault of the inverter are: 1. Detect the overvoltage and undervoltage of the inverter; 2. Detecting overcurrent is the most frequent phenomenon of frequency conversion alarm.
Generally, the overvoltage alarm is generally presented 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 common problem we encounter in use. First of all, the main circuit voltage is too low (220V series is lower than 200V, 380V series is lower than 400V), the primary reason: a rectifier bridge is damaged or there is abnormal operation in the three thyristors, which may lead to the presentation of undervoltage faults, and secondly, the main circuit contactor is damaged, resulting in DC bus voltage loss on the charging resistor, which may lead to undervoltage. In addition, the voltage detection circuit fails and the undervoltage problem occurs.
The main manifestations of overcurrent are as follows:
(1) When restarting, it will trip 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 restarting, it does not trip immediately but when accelerating, 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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Ambient temperature - 10 °C - 40 °C;
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