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