Problems: Automatic chemical supply system stops due to unknown causes. System recovers automatically approximately 5 seconds after stopping. The PLC and other devices, however, need to be restarted. The line is operating for 24 hours, making it difficult to determine the specific cause. One factor is the Switching Power Supply’s output stopping (overcurrent protection function). Propose investigating the inrush current of the device’s load, and using a redundant power supply system and an S8TS for redundant operation. Implement redundant operation with a set of S8TS.