D20/D200
Installation and Operations Guide
GE Energy
994-0078-2.00-7 General
120
Full
Servicing, continued
Batteries
The D20ME/ME II Main board has two lithium batteries located near the front of the
board. These maintain the contents of the NVRAM in the event that power is
removed from the module. See “D20ME Main Module: Board Layout” page 42.
Battery
life should exceed five years:
• If the D20ME is never powered down, or
• If the batteries are disconnected, by removing jumper JP8
Battery life is shortened if they are left connected while the D20ME is powered
down for extended periods.
Battery
Checking
To check battery voltage, use a meter or other measuring device that has high input
impedance. (10MΩ or higher)
The batteries have a nominal voltage of 3.6 volts. Batteries with a voltage of 3.0
volts or less should be changed.
!
• If you remove one or both of the batteries from the D20ME, configuration data
and any other database information stored in NVRAM is lost.
• You have to download the configuration file after battery changing to restore
operation.
Cleaning &
Handling of
Batteries
• Use non-conductive cleaning solution to prevent battery performance
deterioration.
• Dry batteries at a temperature below 85° C to prevent seal deformation, which
may result in leakage.
• Avoid:
− inversion of polarity
− exposure to high temperatures, such as soldering or spot-welding
− excessive force to terminals
• Wear gloves or finger caps when handling batteries to keep them clean.
• For long-term storage,
− keep at temperatures and humidity below normal
− avoid shorting or loading while stored.
!
• There are many electronic components near the battery that are sensitive to
electrostatic discharge
• Observe extreme caution and proper procedures when servicing components that
are sensitive to electrostatic discharge
To Next Page
Loading...
