Service manual

Servo Ventilator 300/300A Introduction
E382 E380E 061 01 03 01 Siemens-Elema AB 17
1
Inspiratory feedback control system (cont'd)
•ACTUAL VALUE is the INSP. PRESSURE signal
from the INSPIRATORY PRESSURE TRANSDUCER
• The actuating signal from the PRESSURE PID
CONTROL
block is used as a FLOW REFERENCE
signal going to the MIXER.
The rest of the controlling system, including
compensating elements, is the same as in
flow regulation.
Pressure regulation
Inspiratory pressure regulation is used only
during inspiration time in all modes except
when flow regulation is used as mentioned
previously.
When PRESSURE regulation is used, the
shadowed main forward path includes the
PRESSURE PID CONTROL block in the REFERENCE &
TIMING main block:
•DESIRED VALUE is the PRESSURE REFERENCE
signal from (the microprocessor module
MODE CPU within) the main block REFERENCE
& TIMING
Pressure
regulation
DESIRED PRESS.
VALUE
ACTUAL PRESS. VALUE
POSITION
SENSOR
INSPIRATORY
VALVE
CONTROLLED SYSTEM
VALVE
SOLENOID
PRESSURE
TRANSDUCERS
FLOW
ACTUAL CURRENT VALUE
FLOW CONTROL
INSP. VALVE POSITION
ACTUAL
SUPPLY
PRESS.
VALUE
GAS
FLOW
VALVE POSITION
CALCULATOR
REFERENCE
& TIMING
PRESS.
PID
CONTR.
FLOW
REF.
MIXER
DESIRED
POSITION
VALUE
CURRENT
CONTROL &
CURRENT
POWER
POSITION PD
CONTROL
FLOW PI
CONTROL
DESIRED
CURRENT
VALUE
ACTUAL POSITION VALUE
GAS
FLOW
REF.
ACTUAL
GAS FLOW
VALUE
DESIRED
GAS FLOW
VALUE
GAS
SUPPLY
PRESS.
INSP. PRESSURE
300-A10E
PRESSURE REF.
INSPIRATORY
CONTROL