Theory of operation
2-46
10070389 Rev. A
Puritan Bennett™ 700 Series Ventilator System Service Manual
2.3.2 Internal battery
The lead-acid internal battery (Figure 2-33) provides a backup for the AC power. Figure 2-34
shows the internal battery installed in the ventilator. The battery pr21 to +26 V to
supply the ventilator’s electrical components. The ventilator operates from the internal
battery if the power supply output is unacceptable and the external battery is not installed or
not adequately charged (see Section 2.7). The battery charges automatically while the
ventilator is connected to AC power and the power switch is on (including when in the
standby mode). A new, fully charged internal battery can operate the ventilator for
approximately 2.5 hours under nominal conditions (tidal volume 0.6 L, respiratory rate
15 breaths/min, PEEP/CPAP 5 cmH
2
O, peak flow 60 L/min, plateau 0 s; average peak pressure
30 cmH
2
O, average mean pressure 8 cmH
2
O).
The battery is housed in a nonmetallic container vented to ambient air and sealed from the
interior of the ventilator.
Through the ventilator’s user interface, you can view the charge level of the internal battery.
A menu function lets you see the approximate hours of internal battery life remaining. The
internal battery replacement interval is approximately every two years.
Warning
Do not use the ventilator unless it has at least one minimally charged battery. The
ventilator may not be protected from power dropout in the absence of a battery.
Figure 2-33. Internal battery
7-00138
Summary of Contents for Puritan Bennett 700 Series
Page 1: ...Service Manual Puritan Bennett 700 Series Ventilator Systems TM...
Page 439: ......
