2
Servo Ventilator 300/300A
Description of functions
E382 E380E 061 01 03 01
Siemens-Elema AB
65
8.15 Flow calculator
The flow depending signal from 8.13
DELTA
PRESSURE
AMPLIFIER
and the absolute supply
pressure depending signal from 8.11
PRESSURE
CALCULATOR
are used to generate a
linearized actual gas flow signal (
AIR
FLOW
).
This flow signal is a flow measurement
referenced to standard barometric pressure
(1013 mbar, 760 mm Hg). For conversion to
ambient pressure, see section "Conversion
for flow and volume to achieve reference to
ambient pressure" in the Operating Manual.
8.16 Flow I control
Controller block comparing actual
AIR
FLOW
and desired
AIR
FLOW
REF
. The actuating
output signal is used to influence the block
8.17
COMPENSATION
±5%.
8.17 Compensation ±5%
The output signal corresponds to the input
signal
AIR
FLOW
REF
with an adjustment
controlled by the block 8.16
FLOW
I
CONTROL
.
The adjustment (compensation) is limited to
a maximum of 5%.
8.18 Valve position calculator
This function is an additional compensating
element for the regulation where the actual
absolute supply pressure value from the
block 8.11
PRESSURE
CALCULATOR
and the
desired
AIR
FLOW
REF
signal compensated in
the block 8.17
COMPENSATION
±5% generate
an activating signal which is used as a basic
reference for
POSITION
of the inspiratory valve.
8.19 Flow PI control
Controller block comparing actual
AIR
FLOW
from the block 8.15
FLOW
CALCULATOR
with
desired
AIR
FLOW
REF
signal compensated in
the block 8.17
COMPENSATION
±5%. The
actuating output signal is added as a final
adjustment to the basic position signal from
the block 8.18
VALVE
POSITION
CALCULATOR
generating the desired
POSITION
REF
signal for
the block 8.20
POSITION
PD
CONTROL
.
8.20 Position PD control
Controller block comparing actual
INSP
.
VALVE
POS
. value from the position sensor in the
block 8.7
INSPIRATORY
SOLENOID
WITH
POSITION
SENSOR
and desired
POSITION
REF
signal
mentioned in the block 8.19
FLOW
PI
CONTROL
.
The actuating output signal (together with a
signal compensating for the supply
pressure) is used as the desired
INSP
.
VALVE
CURRENT
REF
signal in the block 8.21
CURRENT
CONTROL
.
8.21 Current control
Consists of the board PC 1585
CURRENT
CONTROL
.
Controller block regulating the current going
to the block 8.7
INSPIRATORY
SOLENOID
WITH
POSITION
SENSOR
according to the desired input
signal
IINSP
.
VALVE
CURRENT
REF
from the block
8.20
POSITION
PD
CONTROL
. The actuating
output signal is a pulse train with constant
frequency of 30 kHz and pulse width
modulation used in the block 8.22
CURRENT
POWER
.
Содержание Servo Ventilator 300
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