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The electrical system at an aluminum plant was upgraded with new PLC and GUI systems, replacing the old hardwired system. After spending $10 million on the upgrade, the automated system was working well. However, a minor voltage sag caused the PLC-based system to stop working correctly, unlike the old system. The plant manager was frustrated by the reliability issues and cost caused by the voltage sag event. PLC systems are often susceptible to voltage sags because the power supplies may shut down during ev

Author

Mouna Nj

Language

EN