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QUBE
T HEORY
The primary protection circuit also provides over-temperature
protection and prevents the battery from discharging at
temperatures =>75º C. Then, once the battery temperature has
cooled to <=65º C, it allows discharging again. If the battery reaches
85º C for any reason, the secondary protection circuit blows the
in-line power path logic fuse. The fuse is non-resettable, which
renders the battery pack nonfunctional.
The primary protection circuit also provides continuous over-current
protection and prevents the battery from discharging at Current()
<= -6.25 A. Then, Once the Average Current() >= -200 µA for 70 sec,
the battery will retest the overcurrent condition, and again allow
discharging.
If a short-circuit is placed across the battery + / - terminals, the
primary protection circuit prohibits the discharge of the battery.
When the Average Current >= -1 µA for 70 sec, the battery retests
the short-circuit condition, and again allows discharging. The pack is
designed to withstand reasonable in-rush currents without resetting
the electronics and without interrupting the discharge cycle.
A thermal fuse is fitted in series with the charge/discharge path to
protect the battery from over temperature. This device goes open
circuit if the cell case temperature reaches the fuse's temperature
rating of 93° C (+0° C, -5° C). The fuse cannot be reset, which
renders the battery pack nonfunctional.
A current slow-blow fuse is assembled in series with the battery
pack to protect the battery pack against abusive overcurrent
overload. The hold current is rated at 12 A for 4 hours (minimum @
25C). The fuse is non-resettable, which renders the battery pack
nonfunctional.
Warning:
Make sure that a functional Li-Ion battery SLHC P/N 146-0142-xx is
installed in the unit as part of safety checks. Gas, BISx, and SvO
2
modules
do not have battery backup of alarm settings, and alarm settings reset to
defaults if monitor power is interrupted for more than three minutes.
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