Siemens PXC Modular Series User Manual

Hardware Features
Compact Series Backup Batteries
24
| 100
Siemens Industry, Inc.
Technical Reference Manual
145-172
Building Technologies
Restricted
2018-09-25
of a power failure. The batteries only discharge during a power loss. They do not
recharge.
CAUTION
Only use a 3.6 Volt lithium battery in PXC Compact models with extended
temperature range operation.
Only use a 1.5 Volt alkaline battery in standard
PXC Compact models.
• The 3.6 Volt lithium battery is designed to operate at both high and low temperature
extremes, and it provides a long service life in an extended temperature environment.
• The 1.5 Volt alkaline battery is not guaranteed to provide backup protection in
models with extended temperature range operation, even if the controller is operating
in a room-temperature environment.
• If a 3.6 Volt lithium battery is used in standard PXC Compact
models, the battery
quickly discharges and provides much less backup protection than a 1.5 Volt alkaline
battery.
AA Battery
CAUTION
Batteries
Failure to change DEAD alkaline battery will eventually result in battery leakage,
causing permanent damage and loss of building control.
Failure to change a DEAD lithium battery will result in loss of trend and database if
not backed up, causing loss of data or building control.
Establish a preventative maintenance schedule based on expected battery usage and
life cycle.
● The AA battery maintains databases and volatile data, such as Trend, in RAM
when power to the controller is off.
● If reserve power in the AA battery is low, the battery status is reported as LOW or
DEAD and the red LOW BATT LED on the field panel is lit. When this occurs,
replace the battery; do not wait until it goes dead.
● Using PPCL and the $BATT point, the PXC Compact can be programmed to signal
an alarm printer and an operator terminal with a battery replacement message.
For more information, see the APOGEE Powers Process Control Language (PPCL)
User's Manual (125-1896).
Using Auto Restore and Database Backup to Flash
● RAM is cleared if the AA battery is dead, disabled, or missing when power to the
field panel is off. In this case, if Auto Restore and Database Backup to Flash have
been enabled, the database reloads in RAM when power returns; however, Trend
data is lost.
● If a power failure lasts longer than the protection offered by the battery, and Auto
Restore and Database Backup to Flash are not enabled, the information stored in
RAM must be either reloaded from an Insight workstation, Datamate Base or
Datamate Advanced, or entered again by an operator.

Siemens PXC Modular Series Specifications

General

Brand	Siemens
Model	PXC Modular Series
Category	Control Unit
Language	English