Philips V200 Manuel D’Utilisation

REF 1057983 A

Respironics V200 Ventilator Operator’s Manual

When the Respironics V200 ventilator is operating as a ventilator, it is 
constantly making reasonableness checks on the operation of the hardware to 
ensure that failures have not occurred and that the hardware appears to be 
operating normally. Also, while the microprocessor is operating, there is 
execution time available that is not required for ventilator operation. When 
execution time is available, the microprocessor runs many of the hardware 
tests that are run during POST. These include Program memory, RAM memory, 
and other measurements that can be tested without interfering with the 
operations of the ventilator.

The ventilator’s safety system of hardware checking software and software 
checking hardware means that the ventilator only operates as a ventilator if the 
extensive constraints of the safety system are met.

During normal operation, the ventilator performs background checks to ensure 
the integrity of the system. If a problem is detected, the ventilator enters the 
“restart” sequence, in which it opens the safety valve while it performs 
additional integrity checks. Restart is 10 to 20 seconds, depending upon the 
reason for the restart. The ventilator sounds an alarm and displays a visual 
message indicating the unit is in a restart sequence. In some cases, a 
countdown timer will display the number of seconds remaining until the 
ventilator completes the restart cycle. If, during the restart sequence, an 
actual problem is confirmed, the ventilator enters the “Vent Inop” state, in 
which it activates audible and visual alarms while the safety valve remains 
open. Alternatively, if at the end of the restart sequence the ventilator 
determines it is safe to continue operation, the unit will return to normal 
ventilation. 

NOTE: