The main circuit analysis method starts from the main circuit of the frequency converter to analyze the causes and solutions of the faults. According to experience, in case of main circuit failure of ABB frequency converter, we can start from the following aspects.

2.1濾波電容所引起故障

2.1 fault caused by filter capacitor

故障原因：電網電壓不穩，和內部溫度過高，元件性能不好。

Fault cause: unstable grid voltage, high internal temperature and poor component performance.

解決方法：①主要是設備不穩，易受電磁干擾；

Solution: ① the equipment is unstable and vulnerable to electromagnetic interference;

② 更換優質元件，改善通風條件。

② Replace high-quality components and improve ventilation conditions.

2.2變頻器超溫

2.2 overtemperature of frequency converter

故障原因：風扇不轉、風道堵死。

Fault cause: the fan does not rotate and the air duct is blocked.

解決方法：①檢查風扇線圈是否損壞；

Solution: ① check whether the fan coil is damaged;

②清理冷風道積塵鬟爹如缺油卡死的應先加輕油、在加些固體潤滑脂；

② Clean up the dust accumulated in the cold air duct. If the servant father is stuck due to lack of oil, he should first add light oil and some solid grease;

③在更換新冷風風扇時，要注意有的風扇帶自動轉動信號，有的不帶風扇轉動信號，換原型號風扇。

③ When replacing a new cooling fan, it should be noted that some fans have automatic rotation signal and some do not have fan rotation signal. Replace the original fan.

2.3輸出電流過大

2.3 excessive output current

故障原因：輸出電流超過設定極限、跳閘。

Fault cause: the output current exceeds the set limit and trips.

解決方法：①檢查電機負載是否短路；

Solution: ① check whether the motor load is short circuited;

②檢查電機制動器是否完全打開；

② Check whether the motor brake is fully opened;

③檢查機械轉動裝置是否運轉靈活；

③ Check whether the mechanical rotating device operates flexibly;

④判斷異步電動機運轉過程中是否有溫升、有異味、有異響等現象；⑤在確定電機和繞組線圈故障后，更換時注意原有型號和參數。

④ Judge whether there is temperature rise, peculiar smell and abnormal noise during the operation of asynchronous motor; ⑤ After determining the fault of motor and winding coil, pay attention to the original model and parameters during replacement.

2.4制動器故障

2.4 brake failure

故障原因：制動器運轉不到位，到位信號限位不起作用，制動器機械故障。

Fault cause: the brake does not operate in place, the position signal limit does not work, and the brake has mechanical failure.

解決方法：

resolvent:

①檢查制動器供電是否正常；

① Check whether the brake power supply is normal;

②檢查制動器機械傳動是否正常；

② Check whether the mechanical transmission of the brake is normal;

③檢查制動器線圈故障；

③ Check the brake coil fault;

④檢查制動器限位及返回信號；

④ Check the brake limit and return signal;

⑤檢查接觸器是否正常；

⑤ Check whether the contactor is normal;

⑥接觸器主電故障，是由某一觸點接觸不好或是接觸端子螺釘松動，采取修復和更換新元件，制動器損壞應采取從新下線和更換，更換時注意原有型號和參數。

⑥ The main electrical fault of the contactor is caused by poor contact of a contact or loose screws of the contact terminal. Repair and replace new components. If the brake is damaged, it shall be removed from the line and replaced. Pay attention to the original model and parameters during replacement.

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2.5編碼器故障

2.5 encoder failure

故障原因：變頻器檢測到編碼器反饋回來的數據信號出錯或與通訊中斷。

Fault cause: the frequency converter detects that the data signal fed back by the encoder is wrong or the communication with the encoder is interrupted.

解決方法：

resolvent:

①檢查編碼器與電機或設備連接是否正常；

① Check whether the connection between encoder and motor or equipment is normal;

②檢查編碼器信號電纜是否完好；

② Check whether the encoder signal cable is intact;

③檢查編碼器與控制板的連接；

③ Check the connection between encoder and control board;

④檢查編碼器是否受周圍設備干擾；

④ Check whether the encoder is disturbed by surrounding equipment;

⑤校正編碼器位置，排除其它干擾。

⑤ Correct the encoder position to eliminate other interference.

2.6干擾故障

2.6 interference fault

故障原因：主要是傳導干擾和電磁感應干擾。

Fault cause: mainly conducted interference and electromagnetic induction interference.

解決方法：

resolvent:

①主要是檢查各接地線是否良好；

① Mainly check whether all grounding wires are in good condition;

② 檢查各屏蔽線是否連接正常。

② Check whether all shielded wires are connected normally.