...，UC3903的三个OC门输出可以吸收超过30mA的负载电流，这三个OC门输出分别对应过压（OV）、欠压（UV）和电源工作正常（Power OK）三种情况。
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同时提供电源工作正常 Power Okay
当输出电压超过40v时，产品进入保护状态，当故障排除或重新起机时，电源工作正常。
When the output voltage is over 40v the product is protected. When the fault is excluded or is start working again the power supply is working normally.
当变频器及PLC发生故障时，自动切换到原软启动柜工频电源运行，以保证压缩机的正常工作。
When frequency converter and PLC is at fault, automatic switch to the original soft start work frequency power operation, ark to ensure the normal work of the compressor.
该逆变器电源电压相同的条件下正常工作。
The inverter supplies a voltage identical to that under normal operating conditions.
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