S9185FA | Yokogawa | Battery Pack

Description

The Yokogawa S9185FA Battery Pack operates as a dedicated hardware component engineered to provide non-volatile memory backup power for SSC50D Duplexed Field Control Stations within Yokogawa CENTUM VP Distributed Control Systems.

Hardware Specifications

Memory Retention and Battery Backup Architecture

The S9185FA battery module functions as the primary power safeguard for the volatile static random-access memory (SRAM) banks inside the SSC50D processor nest. In the event of a total utility power failure or control rack de-energization, the 3.6 VDC lithium cell maintains the power rail required to preserve the active process control database, system configuration parameters, tuning coefficients, and real-time clock tracking. This prevents data corruption or loss of the control strategy, enabling a deterministic warm restart of the Field Control Station once main power is restored.

Frequently Asked Questions

Q: Can the S9185FA battery pack be safely replaced while the Field Control Station is powered and running? A: Yes. The battery pack can be hot-swapped while the SSC50D control station is fully energized by auxiliary rack power. The main power rails will sustain the volatile memory circuits during the swap procedure, preventing any data loss.

Q: What is the mechanical construction of the ER6V cell utilized within this assembly? A: The ER6V cell is a 3.6 VDC high-energy density lithium thionyl chloride battery equipped with a specialized industrial wire lead and keyed plastic connector plug that aligns explicitly with the SSC50D CPU board interface.

Q: What operational symptoms indicate that the battery pack requires replacement? A: The CENTUM VP system management software will trigger a diagnostic maintenance alarm indicating "FCS Battery Low Status." If this alert is ignored and a subsequent rack power cycle occurs, the station will suffer a complete database wipe, requiring a full application download.

Field Installation Guidelines

• Database Pre-flight Verification: If replacing the battery pack while the SSC50D station is completely offline or de-energized, verify that a fresh backup of the current control database has been uploaded to the Engineering Workstation (ENG) to guard against accidental initialization.
• Keyed Connector Alignment: When mating the S9185FA wire lead harness to the card-edge port, do not force the terminal plug. The plastic connector housing is physically keyed to enforce correct polarity. Forcing the connection backward will cause a dead short or damage the internal charging prevention diodes.
• Lithium Cell Handling Precautions: Do not crush, puncture, incinerate, or expose the cell to temperatures exceeding the factory boundary constraints. Shorting the positive and negative leads together will cause immediate overcurrent degradation, compromising the cell's total milliamp-hour storage capacity.
• Disposal Standards: Spent lithium thionyl chloride packs must be treated as hazardous chemical waste. Dispose of the assembly in accordance with local plant procedures and regional environmental regulations regarding industrial batteries.