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it is automatically switched to the 2 # standby line, and the 1 # main line is automatically switched back when it is restored, the power supply will have a short 3s interruption, the inverter is the equipment, will be in 0.5 s because the power supply lacks the phase to stop immediately, the inverter failure protection, causes a water cut off; when the artificial recovery inverter failure, 2 # standby line is running, 1 # main input line voltage recovery, and automatically switch back to the 1 # main line, switching process, and will cause a short-term power supply interruption, resulting in secondary water cut off. It can be seen that the double-circuit power supply of automatic switching power supply is also an important hidden danger of unstable water supply. Transformation target the transformation of the control mode of the system relates to the production of the whole plant. If it is simply pulled down and redone, it will surely result in the waste of the original equipment. The reconstruction of the system is not only over-invested, but also related to long-term water suspension, caused the factory to stop production, the loss is huge. In view of the above problem, this transformation localization is not stops the water to upgrade the stability transformation. Specific requirements: the renovation process can not stop water, the original equipment as far as possible, only do the key, node, bottleneck transformation, and strive to make small investment, quick effect, high stability. After on-site investigation and technical analysis, the following reform schemes are established: Centralized Monitoring, independent decentralized control, emergency power supply and water supply. Two independent control transformation and two centralized monitoring modification: Two independent control transformation is divided into emergency power supply water supply and inverter independent control transformation; two centralized monitoring is divided into PLC and configuration centralized monitoring program modification and improvement.