Battery Backup - Andrew Node C837 User Manual

5 Functional Description
5.4.1.3

Battery Backup

In case power fails, a battery backup system for controller and modem has been
implemented. This provides enough power for the controller that is integrated into the
downlink DCM and the modem to operate for a limited period of time (see chapter
7.2.3 Specifications for Optional Equipment for battery backup time). Within this time,
the Node C will initiate a call to the OMC and alert the operator that power has been
lost. All other functions will cease to work in case of power failure.
The battery packs are protected from deep discharge by use of a low voltage
disconnect unit. When performing preventive maintenance, make sure that all circuits
are voltage free by disconnecting the battery cable (C1) from its connector (C2). In
case of a power cycle, it is sufficient to press the "Battery disconnect button" to
interrupt the voltage supply. After mains is connected again, the battery will be
charged and the battery backup function will be activated automatically.
Battery pack
C1; to C2 of
charge module
The battery charge module is plugged directly onto the distribution & alarm board of
the Interface Unit through connector C3.
The battery pack should be discharged at regular intervals of about three months to
optimize its service life. This service discharge may be activated via software
depending on the software version. The time required for the discharge varies
depending e.g. on the charge status of the battery pack. A fully charged battery may
require up to some hours to be completely discharged. Consider this when activating
the discharge and also observe the following note.
Note: Please be aware that the backup function is not available during
discharge. Thus, a primary voltage failure in that time will result in
a complete system shut-down.
It is recommended to replace the battery pack of the battery backup option after two
years of usage as a preventive measure. The nominal lifetime of the battery pack is
approx. two years under normal environmental conditions.
ID No: 161692
LED
figure 5-17 Battery backup module, exemplary
PRELIMINARY
Battery charge module
C3 connector
Battery
disconnect button
C2 connector
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