
3700 Series Flat Panel Industrial PC
Chapter 4 – Maintenance
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System Battery Replacement
The 3700 series AIM3 CPU board includes a coin cell type lithium battery that
maintains computer configuration, date, and time information when input power is
removed from the system.
If the AIM3 CPU board battery life is ended then the 3700 series computer will no
longer maintain the configuration information, date, or time and the battery will
need to be replaced. In this case, the following types of error messages will be
displayed on the screen at start-up time:
ERROR
0271: Check Date and Time Settings
Warning
0251: System CMOS Checksum Bad – Default Configuration
Used
Press <F1> to Resume, <F2> to Setup
BATTERY SPECIFICATIONS:
Part Number:
CR2032
Voltage:
3 V
Nominal Capacity:
220 mAh
This battery must be a UL Recognized component.
BATTERY LIFETIME:
Battery current is not consumed while input power is applied to the AIM3 CPU
board. However, electrolyte loss through the crimp seal will typically occur at the
rate of approximately 0.5% per year at 20 degrees C (68 F). This rate will increase
with higher temperatures.
The AIM3 CPU board will consume approximately 6 uA of battery current when
power is removed from the motherboard. At this rate, the battery will last
approximately 4.2 years in storage at 21 degrees C (70 F). This represents 100%
duty cycle, or ‘input power off time’. Example:
Battery Capacity = 220 mAh
IC Current Drain = 6 uA
Battery lifetime = (0.22 aH)/6 X 10
-6
= 36,666 hours = 4.2 years.
When input power is off at the rate of 12 hours per day continuously the battery
life should be approximately double the 100% duty cycle time, or 8.4 years at 21
degrees C (50% duty cycle). When input power is off at the rate of 16 hours per
day the lifetime should be approximately 12.6 years (33%) duty cycle. However,
the electrolyte loss through the crimp seal may reduce the 33% duty cycle lifetime
somewhat.
Battery lifetime is inversely proportional to the temperature of the battery. At
elevated temperatures the battery life will be decreased.
BATTERY REMOVAL:
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com