Honeywell 51155996 RAM Charger Assembly

Overview

The Honeywell 51155996, also cataloged as the 51155996 RAM Charger Assembly / PLC-DCS Module, operates as a dedicated hardware component for memory backup power retention of C300 controller volatile RAM within Experion PKS C300 Controller Series. It provides regulated energy buffering for controller memory and configuration retention during supply interruption events, interfacing through the system backplane power distribution path. The unit supports multi-module memory support architecture for up to four controller or extension modules under defined chassis configuration.

Hardware Specifications

Backplane Power Retention and Memory Hold-Up Architecture

The 51155996 module interfaces directly with the C300 controller backplane power structure to maintain RAM state retention during transient or sustained supply disturbances. Energy storage and regulation circuitry are aligned with chassis-level distribution rules defined by the Experion PKS architecture. The module participates in coordinated retention behavior across installed controller and extension nodes, ensuring consistent memory state preservation boundaries within the supported module group.

Signal and system interaction is confined to internal power and control rails; no external process signal conditioning is performed. Module behavior is dependent on chassis backplane electrical integrity and defined slot allocation within the C300 controller rack structure.

Frequently Asked Questions

Q: Can the 51155996 be hot-swapped during controller operation?
A: Hot-swap capability is dependent on chassis configuration and system power state. In standard deployment, removal or insertion should follow controller maintenance isolation procedures to prevent backplane voltage disturbance.

Q: Does the module directly influence process I/O signals?
A: No. The module operates exclusively on memory backup power paths and does not interface with analog or digital process signal channels.

Q: What happens to RAM retention during module failure?
A: Loss of backup charging function results in loss of volatile memory retention capability during power interruption events, while non-volatile configuration storage remains unaffected by the module itself.

Field Installation Guidelines

Installation shall be performed with system power isolated from the controller rack backplane. The module must be inserted into the designated C300 chassis slot ensuring full connector engagement along the backplane interface. ESD grounding procedures are required during handling to prevent electrostatic discharge into memory retention circuitry.

Cable routing is not applicable, as the module does not use external field wiring. Verify mechanical seating integrity and chassis alignment before re-energizing the system. Removal should be performed using controlled extraction force aligned with rack guide rails to avoid backplane connector stress.

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