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Theory of operation
2-78
10070389 Rev. A
Puritan Bennett™ 700 Series Ventilator System Service Manual
Figure 2-63. Power source switchover
7-00134
Power switch on
A
External battery
output ≥21 V?
No
Internal battery
output ≥21 V?
Yes
Yes
No
Is power supply
output ≥21 V?
No
Yes
Use external battery
Use external battery
B
Is power supply
output ≥21 V?
Is power supply
output ≥21 V?
B
B
Internal battery
output ≥21 V?
External battery
output ≥21 V?
No
Perform orderly
shutdown of the
ventilator and activate
total loss of power
alarm.
A
A
No
Yes
No
No
Yes
Yes
Yes
B
Set 3 second timer
User power supply
output
No
Yes
Is power supply
output ≥21 V?
Have 3 s
elapsed since
timer started?
No
A
Yes
Summary of Contents for Puritan Bennett 700 Series
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