The device was subject to an on-site evaluation by a dräger service engineer.The reported issue of a ventilation shut down during use could be confirmed by log file analysis: the records stored therein indicate that the supervisor software detected a deviation between calculated and measured piston position.The piston hub defines the applied tidal volume and thus, to prevent from potentially hazardous output and/or from damages to the ventilator unit, the system is designed to shut down automatic ventilation and to alert the user to this condition by means of a corresponding alarm.The issue may be a "real one" related to wear and tear of the motor itself or a "virtual one" caused by issues with the piston position detection system - both conditions will result in the same log file entry.A differentiation is not possible without inspection of the hardware for which the entire device has to be disassembled.The customer has not responded so far upon the repair quotation and thus, neither was an in-depth investigation performed nor is a reliable conclusion in regard to the exact root cause possible.It can only be concluded that the device responded as designed upon the measured piston position divergence and has shut down automatic ventilation while posting a corresponding alarm.
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