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7.2.2
PTU (Pressure Transducer Unit) Board
The PTU board contains sensors for air flow, and air outlet pressure. For redundancy
there are two air outlet pressure sensors.
7.3
Ventilator Switch-over Operating Conditions
The ventilator can run from four different power sources. The priority of the power
ources is:
•
Mains DC
•
External DC
•
Click-in battery
•
Internal battery
7.3.1
Mains DC Operation
If the Mains DC drops below 17.2 VDC, the ventilator will switch over to the next avail-
able power source.
7.3.2
External DC Battery Operation
If the external battery voltage drops below 12 V the ventilator will switch to the next
available power source. The ventilator will also issue an information message stating
that there has been a change of power source.
7.3.3
Click-In Battery Operation
The click-in battery has its own integrated processor and electronics that estimates the
battery
’
s state of charge and communicates with the ventilator main processor.
When the click-in battery is discharged it sends a signal to the ventilator main processor
which switches to the internal battery and issues an information message stating that
there has been a change of power source.
7.3.4
Internal Battery Operation
The internal battery has its own integrated processor and electronics that estimates the
battery
’
s state of charge and communicates with the ventilator main processor.
There will be an information message when the internal battery estimates that it has 50
percent of its capacity left.
When the internal battery estimates that it has 15 minutes of operation left, the ventila-
tor will issue a last power source low alarm.
When the internal battery is fully discharged the ventilator will issue a power fail alarm
and stop operation.
64 Electronics
Vivo 45/Nippy 4 Series Service manual
Doc. 007132 D-2
Summary of Contents for Nippy 4 Series
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