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Frequency converter maintenance

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Name：Sinusoidal inverter maintenance

Model：EM303A

Sine inverter without display, lack of phase, over current, over voltage, under voltage, overheating, overload, grounding, parameter errors, there is no output, module damage, fault code, etc.. Jia Hong Wei repair sinusoidal EM100/EM303A/EM303B/EM500/EM600 series inverter maintenance. Please call the service hotline 0755-28916839, 13640994287, we have a professional customer service staff to quickly respond to your needs.

Description

Sinusoidal inverter maintenance
Model: EM303A-02R2G
Fault: boot display "SC" alarm failure analysis: SC fault is a sine inverter more common fault. IGBT single tube damage, this is one of the reasons for SC fault alarm. In addition drive circuit damage is also easy to cause SC fault alarm. In the sinusoidal driving circuit design, the bridge used PC923 driver, which is dedicated to a single IGBT drive amplifying circuit of a optocoupler, under the bridge sine driving circuit is adopted in optocoupler PC929, this is an internal with amplifier circuit and detection circuit, optocoupler. In addition, motor jitter, three-phase current, voltage unbalance, frequency display without voltage output, these phenomena are likely to be single damage IGBT. There are many reasons for IGBT single damage, the first is the external load failure caused damage to the IGBT tube such as load short-circuit, blockage etc.. Followed by the driving circuit aging may also lead to the drive waveform distortion, or drive voltage fluctuations are too large and lead to IGBT damage, resulting in SC fault alarm. The measurement for phase UW single "SC" alarm caused damage. Repair: the replacement of IGBT single power on normal operation.
Jia Hong Wei repair service hotline: 0755-28916839, 13640994287 Shaw

Description

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