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π Real-World Use & Application Scenarios (Open Strong)
The GE IC693ACC302B is an essential, high-reliability accessory widely used across all industrial sectors employing the robust GE Fanuc Series 90-30 PLC platform, including water/wastewater treatment, packaging lines, and discrete manufacturing. Unlike the primary power supply or processor, this component is not directly involved in executing control logic; rather, its function is purely data preservation during power outages. It is deployed in every PLC installation where the loss of memory containing the control program, configuration parameters, and accumulated data is unacceptable.
Engineers rely on the GE IC693ACC302B to provide backup power for the volatile CMOS RAM inside the CPU module.1This critical application scenario arises whenever the main $5 \text{ VDC}$ power supply to the CPU is lost, either due to a facility-wide power failure, a tripped breaker, or when the PLC system must be completely de-energized for planned maintenance. Without a functioning battery like the GE IC693ACC302B, the PLC would lose the entire control program, I/O configuration, and all stored data values (timers, counters, holding registers) upon power loss, necessitating a full download before the process can be restarted. This would lead to unacceptable downtime. Therefore, installing and maintaining the GE IC693ACC302B is a non-negotiable best practice for maintaining the integrity and high-availability of any automation system using the Series 90-30 architecture.
π¬ Product Introduction & Positioning
The GE IC693ACC302B is a Battery Assembly designed specifically to provide memory retention backup power for various CPU modules within the GE Fanuc Series 90-30 PLC family, such as the CPU311, CPU313, CPU351, and others.It is an auxiliary component that connects directly to the CPU board via a dedicated terminal or connector inside the main rack or the CPU housing itself.
Its role in the system architecture is strictly protective. It acts as an emergency power source, continuously monitoring the main system voltage. When the primary power dips below a critical threshold, the IC693ACC302B automatically engages to supply the low current required to maintain the data state within the CPU’s memory chips. It is not designed to power the entire rack or maintain I/O operation. What makes the GE IC693ACC302B valuable is its pre-packaged, rugged designβit combines the necessary battery cells (typically Lithium Thionyl Chloride, known for long shelf life and stable voltage) and a connector in a durable assembly, simplifying installation and replacement while ensuring the correct voltage and current are supplied for reliable RAM retention.
- IC693ACC302B
- IC693ACC302B
π Key Technical Features & Functional Benefits
The functional strength of the GE IC693ACC302B lies in its chemical composition and engineered capacity. It typically utilizes a Lithium-based chemistry (like Lithium Thionyl Chloride), which provides a stable, long-term voltage output (often aroundΒ $3.0 \text{ VDC}$) necessary for low-power RAM retention circuits.This chemistry delivers a very low self-discharge rate, allowing the battery to maintain its full capacity over a storage life that can exceed five years, and an operational life often spanning several years within the PLC.
In terms of hardware design, the IC693ACC302B is built as a single, self-contained unit with a molded plastic housing and a factory-terminated connector cable. This construction is crucial for long-term reliability in industrial environments, protecting the cells from moisture, dust, and minor vibration. The connector ensures correct polarity and a secure electrical connection to the CPU board, preventing intermittent contact issues that could result in program loss. The primary benefit the GE IC693ACC302B offers is zero maintenance during its service life; unlike rechargeable batteries, it requires no charging circuits or monitoring beyond the CPU’s own low-battery fault reporting. When the CPU signals a low battery, the entire GE IC693ACC302B assembly is simply replaced.
π Detailed Technical Specifications
| Parameter | Value |
| Model | IC693ACC302B |
| Brand | GE Fanuc / Emerson |
| Type | Memory Retention Battery Assembly |
| Battery Chemistry | Lithium (e.g., Lithium Thionyl Chloride) |
| Nominal Voltage | 3.0 VDC |
| Typical Capacity | $\sim 1800 \text{ mAh}$ |
| Application | Backing up CPU RAM in GE Series 90-30 |
| Estimated Service Life | $2 \text{ to } 5 \text{ Years}$ (Application dependent) |
| Operating Temperature | $0^\circ\text{C}$ to $60^\circ\text{C}$ |
| Mounting | Internal to CPU or Rack (Plug-in Connection) |
| Connector Type | Dedicated Plug (Factory Terminated) |
| Important Note | Non-Rechargeable Primary Cell |
𧩠Related Modules or Compatible Units
IC693CPU311 β One of the base Series 90-30 CPU modules that uses the GE IC693ACC302B to retain its operational program and data.
IC693CPU351 β A higher-performance Series 90-30 CPU that also relies on the IC693ACC302B for non-volatile memory backup.
IC693PWR321 β A standard $120/240 \text{ VAC}$ Power Supply used in the same rack that the GE IC693ACC302B is designed to supplement during power loss.
IC693ACC301 β The older or alternate battery assembly for the Series 90-30, potentially with a slightly different capacity or form factor.
IC693CHS397 β A 5-slot rack/chassis that houses the CPU and I/O modules, where the IC693ACC302B is internally installed.
IC693ACC303 β An alternative battery type or assembly often used for newer or different GE PLC models.
π οΈ Installation Notes & Maintenance Best Practices
When replacing the GE IC693ACC302B, it is critical to perform the procedure while the PLC CPU module is powered on. This is the single most important pre-installation consideration, as maintaining power prevents the RAM from losing its content during the swap. The replacement should be executed quickly but carefully, ensuring the new battery assembly’s connector is fully seated into the mating receptacle on the CPU board. Once the battery is replaced, the CPU’s low-battery fault LED should clear.
Maintenance expectations are straightforward: the only required task is replacement. The longevity of the GE IC693ACC302B is often monitored by the CPU itself, which generates a system fault and illuminates a dedicated low-battery LED when the voltage drops to a critical level. Once this alarm is triggered, the battery should be replaced immediately, even if the system is currently powered, as memory retention is no longer guaranteed when power is removed. Integrators should set up a preventative maintenance schedule to replace all $90-30$ batteries every three years as a proactive measure, regardless of the low-battery alarm status, to mitigate the risk of catastrophic program loss.
