Datex-Ohmeda Aestiva 7900 SmartVent, Technical Reference Manual

Page: 139 / 204

5 Troubleshooting
1006-0453-000 05/04 5-23
Alarm Message footnotes:
(1) These alarms will de-escalate to low priority following user acknowledgment by pressing the alarm silence switch.
(2) These alarms also have associated text displayed in the user messages window.
(3) These alarm messages do not have an elapsed time indication.
(4) This alarm is enunciated at the maximum volume level and is not silenceable.
(5) Serial connection to the RGM suppresses audio for these alarms
(6) All minimum system shutdown alarms have high priority audio characteristics.
• If the user presses the alarm silence key, the high priority audio is silenced for 120 seconds.)
• If the shutdown condition occurs during non-mechanical ventilation with the Bag/Vent switch in Vent or during mechanical
ventilation and the user moves the Bag/Vent switch to Bag, the high priority audio is silenced for 120 seconds.
• If the Bag/Vent switch is moved from Bag to Vent while a shutdown condition is active and the audio silenced, the high priority audio
is generated (once again).
(7) The software will try to cause a reset of the processor after the user presses the control wheel (in response to the shutdown message).
(8) All minimum system monitoring alarms have medium priority audio characteristics.
(9) All messages appear in the user messages window.
(10) Flow sensors are also used to measure pressures.
(11) The sustained pressure threshold is calculated from the pressure limit setting. When mechanical ventilation is on, the sustained limit
is calculated as follows: for pressure limits < 30 cmH
2
O, the sustained pressure limit is 6 cm H2O; for Plimit between 30 and 60 cmH
2
O,
the sustained limit is 20% of the pressure limit (Plimit); for pressure limits >60 cmH
2
O, the sustained pressure limit is 12 cm H
2
O.
If both PEEP and Mechanical ventilation are on, the sustained pressure limit increases by PEEP - 2 cmH
2
O (the compensated weight of
the bellows). When mechanical ventilation is off, the sustained pressure limit is calculated as follows: for pressure limits ≤60 cmH
2
O,
the sustained pressure limit is 50% of the pressure limit (Plimit); for pressure limits >60 cm H
2
O, the sustained pressure limit
is 30 cmH
2
O.
V
TE
> Insp V
T
(2)
low In-range flow data
available V
TE
> larger of (V
TI
+
0.3 ⋅ V
T
or V
TI
+ 100) for 6
consecutive mechanical
breaths in circle system
Check flow sensor connections.
Check ventilator settings.
Check the breathing circuit and flow sensor
connections.
Perform flow sensor calibration.
Replace the flow sensors.
Check SIB to CPU cabling.
Replace the SIB board.
Replace the CPU board.
Four consecutive breaths measured with “correct
volume” seen by flow sensors
Message Alarm type/
Priority Enabling Criteria Alarm Condition Service Repair
Removal Criteria