Theory of operation
Puritan Bennett™ 700 Series Ventilator System Service Manual
10070389 Rev. A
2-47
Figure 2-34. Internal battery and main fan installed in ventilator
2.3.3 External battery
The optional lead-acid external battery (Figure 2-35), provides backup for the AC power. It
su21 to +26 V to supply the ventilator’s electrical requirements. The ventilator
operates from the external battery if the power supply output is unacceptable, provided the
external battery is installed and adequately charged (see Section 2.7). A new, fully charged
external battery can operate the ventilator for approximately 7 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 external battery is connected to the ventilator through the external battery connector
(Figure 2-34). This connector has a jumper that allows the ventilator to recognize the external
battery is installed. The external battery is enclosed in a separate case designed to mount
under the ventilator on a shelf.
The external battery replacement interval is approximately every two years. A menu function
lets you see the approximate hours of external battery life remaining. The battery contains a
replaceable fuse.
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
.
7-00139
External
battery
connector
Internal
battery
Main fan
Summary of Contents for Puritan Bennett 700 Series
Page 1: ...Service Manual Puritan Bennett 700 Series Ventilator Systems TM...
Page 439: ......
