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Operation: Getting Started
20
Warnings and Faults
Pump Stall
This fault indicates that the expected motion of the piston axis does not match the
actual motion. This is a critical fault and requires operator intervention.The valve is
set to the expiration position and the machine is commanded to STOP. The user is
always notified via a visual alarm and also by an audible alarm (if enabled).
Valve Stall
This fault indicates that the expected motion of the valve axis does not match the actu-
al motion. This is a critical fault and requires operator intervention. The machine is
commanded to STOP. The user is notified via a visual alarm and audible alarm (if
enabled).
Motor Drive Fault
This fault indicates a problem with the step motor drive. This is a critical fault and
requires operator intervention. The machine is commanded to a STOP state.
Airway Over-Pressure
This fault indicates that an overpressure condition has been detected in the airway.
The user is always notified via a visual alarm and also by an audible alarm (if enabled).
An overpressure in Volume Control mode is defined as a pressure greater than the aver-
age measured peak pressure (averaged over 10 samples, not counting sigh breaths)
plus 10 cmH 2 O, or 67cmH 2 O, whichever is smaller.This limit is adjusted during sigh
breaths to 150% of the average value or 67 cmH 2 O, whichever is smaller.The option-
al user-entered inspiration pressure limit is used as a secondary pressure check. The
default limit is 35 cmH 2 O. If the average pressure should rise up and exceed this
value, the user is notified via a visual alarm and also by an audible alarm (if enabled).
Airway overpressure conditions cause the inspiration stroke to stop; the machine
immediately cycles to expiration. After completing expiration, the machine will con-
tinue to run the current respiration profile, repeating the above steps if the overpres-
sure condition continues. If the fault is cleared, the alarms (visual and audible) will self-
clear. Otherwise, the alarms will continue, requesting operator intervention.
Publication 5404-001-REV-C
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