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2 Preparing for ventilation
2.12.1 Introduction
Backup batteries, both the internal battery and the optional
extended battery pack, protect the device from low or failure
of AC power. When AC mains fail to provide power during
ventilation, the ventilator power supply automatically switches
to backup battery without an interruption in ventilation. An
alarm sounds to signal the switchover. The alarm will continue
sound until you silence the alarm. Silencing the alarm confirms
operator notification of the power system change and resets
the alarm.
When the device AC power supply is interrupted the ventilator
shifts to the optional extended battery pack. If this is not avai-
lable or adequately charged, the ventilator power supply will
choose to switch to internal battery.
Important: The batteries power the ventilator until AC power is
again adequate or until the batteries are depleted.
As a further safeguard, the device provides a “low-battery”
alarm. The low-battery alarm is operated by a capacitor-driven
buzzer that sounds for at least 2 minutes when either type of
battery power is completely lost.
Both the internal and extended batteries power the ventilator
for a minimum of 1 hour each (for new, fully charged batteries
with the device at default settings and a 2 liter demonstration
lung).
When the ventilator is connected to the AC mains power, the
batteries are charged, with or without the ventilator power
being switched ON.
The power source symbols are displayed in the bottom right-
hand corner of the screen (Figure 2-18) indicating the available
power sources. A frame around a symbol indicates the current
ventilator power source (AC mains, internal battery, or
extended battery).
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