UC4: Notify operator of validation errors.
UC 4：通知操作员校验失败。
Therefore, it is to shut down axial fan conveyor motor and turn off power after finished products with freeze, as well as notify the operator at ammonia compressor and keep telephone records.
货将冻结完毕，关闭轴流风机及传送电机，切断电源。通知氨压缩机操作人员，并做好电话记录。
Therefore, it is to shut down axial fan conveyor motor and turn off power after finished products with freeze, as well as notify the operator at ammonia compressor and keep telephone records.
货将冻结完毕，关闭轴流风机及传送电机，切断电源。通知氨压缩机操作人员，并做好电话记录。
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