Installing the NAE/NIE Technical Bulletin
12
Batteries
The NAE uses two batteries, one for clock backup and another for data
protection. Battery life can be shorter than expected if your system
experiences the following conditions:
•
extremely high or low ambient temperatures
•
frequent power cycling
•
long periods of power loss
Clock Backup Battery
The NAE contains a battery on the circuit board that provides standby
power to the clock if power is lost. The Metasys system extended
architecture system uses Simple Network Time Protocol (SNTP) for
time synchronization, but the clock backup battery is still required to
keep clock time during a power loss/shutdown.
The life of the clock battery in typically is in excess of 10 years.
See
Troubleshooting the NAE/NIE Technical Bulletin (LIT-1201417)
for battery testing and replacement information. Replacing the clock
battery requires the intervention of specially trained service personnel
and is best done during a planned system shutdown.
Data Protection Battery
The NAE also contains a rechargeable and accessible battery to protect
the data in the NAE volatile memory in case of power loss. If power
fails, the NAE shuts down using battery power and saves field data to
the flash memory. The battery
does not
allow the NAE to function as
it would under regular power (for example, alarm messaging,
command execution, trend data collection). In critical environments,
connect the NAE to a backup power source or emergency generator to
ensure that the NAE continues its supervisory duties during a general
utilities power failure. The typical life of the data protection battery is
3 to 5 years.
See
Troubleshooting the NAE/NIE Technical Bulletin (LIT-1201417)
for battery testing and replacement information. The data protection
battery can be replaced in the field.
Mounting Feet
The mounting feet are designed to make mounting easier. If you mount
the NAE in the preferred wall mounting orientation, you can insert the
top fasteners into the mounting surface and hang the NAE until you
are ready to install the other two fasteners.
