Maquet Servo ventilator 900 C, Руководство по обслуживанию

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Reference level
The main block REFERENCE LEVEL generates the
DESIRED VALUE for each regulating system, corre-
sponding to the settings on the front panel.
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Regulation of inspiration
The regulation of inspiration is done by means of the FLOW
SERVO LOOP in the following modes: VOL. CONTR. VOL.
CONTR. + SIGH. MAN., each mandatory inspiration during
SIMV + PRESS. SUPPORT and each mandatory inspiration
during SIMV.
The actual value for the controller in this loop comes
from the FLOW TRANSDUCER in the inspiratory channel.
The regulation of inspiration is done by means of the
PRESSURE SERVO LOOP in the following modes: PRESS
SUPPORT. PRESS. CONTR., CPAP, each spontaneous
inspiration during SIMV + PRESS.SUPPORT and each
spontaneous inspiration during SIMV.
The actual value for the controller in this loop comes
from the PRESSURE TRANSDUCER in the inspiratory
channel.
The ERROR SIGNAL from the controller in use (flow
or pressure), is fed to a converter, common to both
inspiratory servo loops, which delivers the valve
control signal to the inspiratory valve (positioning).
For both servo loops, the inspiratory valve is the
controlling element in regulation of inspiration.
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Timing
Reference timing pulses (START SIMV CYCLE, CLOCK,
INSP.TIME and EXP.TIME) are generated in this main block.
The TIMING gets some command variables from the
front panel settings.
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Monitoring
The monitoring of all values that are displayed on the panel
meters and the digital display takes place in this main
block.
Some of the readings are compared with preset alarm
limits and visual and audible alarms are acti vated if the
preset limits are exceeded.
The monitoring system is independent of the
regulating systems.
The pressure limiting system is included in this
main block.
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Regulation of expiration
The regulation of expiration is done by means of the
PRESSURE SERVO LOOP during expiration in all modes
when using PEEP.
The actual value for the controller in this loop comes
from the PRESSURE TRANSDUCER in the expiratory
channel.
The error signal from the controller is fed to a con-
verter which delivers the valve control signals for the
expiratory valve (positioning).
The expiratory valve is the controlling element in
regulation of expiration.
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Power supply
The four regulated supply voltages are; +5V, ±15V and
+24V.
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Input/output
Output signals are buffered in this main block.
Some of the functions of the ventilator can be
externally controlled via inputs in this block.
= Not valid for SV 900 D = Not valid for SV 900 E
Principle diagram