GE Vernova IC695ACC302 Auxiliary Battery Module

Product Details

IC695ACC302 Product Description

The IC695ACC302 is not a standalone component — it is a precision-matched auxiliary element within the GE PACSystems RX3i distributed control architecture. Its primary function is to sustain CPU program memory, retentive data registers, and real-time clock values during planned or unplanned power interruptions, ensuring that the control system resumes operation without re-initialization delays or data loss.

In a fully integrated RX3i rack, the IC695ACC302 works in direct support of CPU modules such as the IC695CPU310, IC695CPU315, IC695CPU320, and IC695CPU330. These CPUs manage ladder logic execution, function block processing, and structured text programs across the entire automation platform. Without a properly maintained battery module, a power cycle event forces the CPU to reload firmware from flash — a process that introduces unacceptable downtime in continuous-process environments such as petrochemical refining, power generation, and water treatment.

The RX3i backplane — typically the IC695CHS012 or IC695CHS016 universal backplane — hosts the CPU alongside I/O modules such as the IC695MDL654 discrete input module and IC695ALG600 analog input module. These I/O modules feed real-time field signals into the CPU's scan cycle. The IC695ACC302 ensures that all accumulated process data, PID tuning parameters, and alarm setpoints stored in retentive memory remain intact across power events, eliminating the need for manual re-entry of engineering parameters after each restart.

Communication stability is equally dependent on memory retention. The RX3i platform commonly integrates the IC695ETM001 Ethernet interface module for SRTP and Modbus TCP communication, as well as the IC695PBM300 PROFIBUS master module for field device connectivity. When the CPU retains its communication configuration tables through the IC695ACC302, network re-establishment after a power event is automatic and immediate — no re-commissioning of device addresses or network parameters is required.

In redundancy architectures, the IC695ACC302 plays a critical role in both primary and secondary CPU modules within a Hot Standby Redundancy (HSR) configuration using the IC695RMX128 redundancy memory exchange module. Both CPUs must maintain synchronized retentive data to enable bumpless switchover. A depleted or missing battery in either CPU introduces a risk of data divergence between primary and secondary controllers, which can trigger unnecessary failover events or, worse, prevent a clean switchover during a genuine fault condition.

From an HMI and SCADA integration perspective, operator stations connected via iFIX, Cimplicity, or third-party SCADA platforms rely on consistent tag values and alarm histories stored in the CPU's retentive data area. The IC695ACC302 ensures that historical trend data, recipe parameters, and operator-defined setpoints are preserved, reducing the engineering effort required to restore a system to its pre-fault operational state.

Power supply modules such as the IC695PSA040 and IC695PSD040 provide the primary DC bus voltage to the RX3i rack. While these modules deliver regulated power during normal operation, they cannot sustain CPU memory during a power-down event — that function is exclusively handled by the IC695ACC302. Proper battery maintenance scheduling, combined with the CPU's built-in battery status diagnostic output, allows maintenance engineers to replace the IC695ACC302 proactively before memory retention is compromised.

Power Generation & Utilities: In gas turbine control panels and substation automation systems, the RX3i CPU must retain protection relay coordination parameters, load-shedding logic, and fault recorder data across scheduled maintenance shutdowns. The IC695ACC302 ensures that these critical parameters survive power cycling without requiring re-entry by protection engineers.

Petrochemical & Refining: Continuous process plants operating distillation columns, reactor vessels, and compressor trains cannot tolerate CPU re-initialization during turnaround maintenance. The IC695ACC302 preserves PID loop tuning, interlock logic states, and process historian tags, enabling rapid restart after planned outages.

Water & Wastewater Treatment: Municipal water treatment facilities rely on RX3i controllers for pump sequencing, chemical dosing, and SCADA data logging. Battery-backed memory retention through the IC695ACC302 ensures that flow totalizers, chemical consumption records, and alarm histories are maintained through power interruptions caused by grid instability or scheduled maintenance.

Mining & Metallurgy: Conveyor control systems, crusher automation, and smelter process controllers in mining operations require consistent program execution after power events. The IC695ACC302 supports rapid system recovery, minimizing production losses associated with CPU cold-start re-initialization in remote or harsh-environment installations.

Packaging & Discrete Manufacturing: High-speed packaging lines and assembly systems using RX3i controllers for motion coordination and vision system integration depend on retentive recipe data and production counters. The IC695ACC302 ensures that shift production totals, recipe parameters, and machine configuration data are preserved across line changeovers and power events.

Q1: Is the IC695ACC302 compatible with all PACSystems RX3i CPU modules? The IC695ACC302 is designed for use with the PACSystems RX3i CPU family, including the IC695CPU310, IC695CPU315, IC695CPU320, and IC695CPU330. It plugs directly into the battery slot on the CPU module faceplate. Compatibility should always be verified against the specific CPU firmware version and GE PACSystems RX3i Hardware Reference Manual (GFK-2314) before installation. Our team can assist with cross-referencing your existing CPU module revision to confirm fit.

Q2: How does the IC695ACC302 integrate into a Hot Standby Redundancy architecture, and what happens if the battery fails in one CPU? In an HSR configuration using the IC695RMX128 redundancy memory exchange module, both the primary and secondary CPU modules require a functional IC695ACC302 to maintain synchronized retentive data. If the battery in either CPU is depleted, the affected CPU may lose retentive data during a power event, causing a data mismatch between primary and secondary controllers. This can prevent a clean bumpless switchover. Best practice is to implement a scheduled battery replacement program — typically every 3 to 5 years depending on operating temperature — and to monitor the CPU's battery status diagnostic bit via the system configuration tool (Proficy Machine Edition) to receive advance warning before battery depletion.

Q3: What warranty and supply assurance does NANKMOS provide for the IC695ACC302? All IC695ACC302 units supplied by NANKMOS are covered by a 12-Month Warranty from the date of shipment. Each unit undergoes pre-shipment functional testing to verify battery voltage and physical integrity before dispatch. We maintain in-stock inventory of the IC695ACC302 and related RX3i auxiliary components to support rapid fulfillment for both planned maintenance schedules and emergency replacement requirements. For volume procurement, long-term supply agreements, or technical pre-sales consultation, contact our engineering team directly.