Chapter 2. CPU Features & SpecificationsGFK-2222AD April 2018 75Real-Time Clock Battery CPE302/CPE305 & CPE310The CPE302, CPE305 and CPE310 are shipped with areal-time clock (RTC) battery (IC690ACC001) installed(Figure 25), and with an isolation barrier on thebattery. Remove the isolation barrier via its pull-tabbefore installing the CPE302, CPE305 or CPE310module; otherwise the battery will not function.There are no diagnostics or indicators to monitor RTCbattery status.The RTC battery has an estimated life of 5 years andmust be replaced every 5 years on a preventativemaintenance schedule.If the RTC battery fails, the CPU date and time is resetto 12:00 AM, 01-10-2000 at startup. The CPU operatesnormally with a failed or missing RTC battery; only theinitial CPU TOD clock information will be incorrect.Note: Battery replacement on CPE330 isdifferent. Refer to Figure 20.Figure 25: Accessing Real-Time Clock Battery(CPE302, CPE305 and CPE310)Replacing the Real-Time Clock Battery in CPE302/CPE305/CPE310The replacement battery must be IC690ACC001 from GE Automation & Controls, or an equivalent, suchas Rayovac Lithium BR2032 Coin Cell 3V 190mAh -40°C to +85°C.WarningUse of a different type of battery than that specified here maypresent a risk of fire or explosion.Battery may explode if mistreated. Do not recharge,disassemble, heat above 100°C (212°F), or incinerate.CautionTo avoid damage from electrostatic discharge, use proper precautionswhen performing these procedures:▪ Wear a properly functioning antistatic strap and be sure that you arefully grounded. Never touch the printed circuit board, or componentson the board, unless you are wearing an antistatic strap.▪ Any surface upon which you place the unprotected circuit boardshould be static-safe, facilitated by antistatic mats if possible.Extra caution should be taken in cold, dry weather, when static charges caneasily build up.
