ABB SDCS-POW-4 Power Supply: The Foundation for Advant and Symphony Plus Controller Availability

In a sprawling liquefied natural gas (LNG) export terminal, the DCS controlling the cryogenic processes and safety shutdown systems must operate with zero unexpected downtime. A single power supply failure cannot compromise the system. Here, multiple ABB SDCS-POW-4​ modules are deployed in a redundant (N+1) configuration within each critical controller cabinet. They are connected to separate, independent AC feeders. If the primary AC source fails or a SDCS-POW-4​ unit itself malfunctions, the redundant unit instantaneously and seamlessly picks up the full load without any interruption to the 24V DC bus. This ensures that the Advant controllers, I/O modules, and network switches continue to operate flawlessly, preventing a catastrophic process trip and maintaining the plant’s safety integrity level (SIL). The SDCS-POW-4​ directly addresses the core pain point of power source vulnerability in critical infrastructure.