Siemens Servo Ventilator 300 User manual

Servo Ventilator 300/300A
Service Manual
E382 E380E 061 01 03 01
Adult
Pediatric
Neonate
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5
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19
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SIEMENS

2 Siemens-Elema AB E382 E380E 061 01 03 01
Servo Ventilator 300/300A
General
 Unless stated otherwise, the information
in this Service Manual is valid for:
 Servo Ventilator 300 (SV 300)
 Servo Ventilator 300A (SV 300A)
 The documentation for the Servo
Ventilator 300/300A consists of:
 Operating Manual
 Service Manual
 Circuit Diagram
 Spare Parts Catalogue
 Reference Manual, Computer Interface
 The Operating Manual is an indispens-
able complement to the Service Manual
for proper servicing
 In addition to the Important information
given here and in the related documents,
always pay attention to applicable local
and national regulations
 Responsibility for the safe functioning of
the equipment reverts to the owner or
user in all cases in which service or
repair has been done by a non-
professional or by persons who are not
employed by or authorized by Siemens,
and when the equipment is used for
other than its intended purpose
 Data on internal pressures in the Servo
Ventilator 300/300A are given in Pa (bar)
Airway pressures are given in cm H2O
1 hPa = 1 mbar 1 mbar = 1 hPa
1 kPa = 10 mbar 1 mbar = 0.1 kPa
1 kPa = 0.01 bar 1 bar = 100 kPa
1 kPa i 10 cm H2O 1 cm H2O i 0.1 kPa
1 kPa i 0.01 at 1 at ³ 100 kPa
1 kPa i 0.01 kgf/cm21 kgf/cm2 i 100 kPa
1 kPa i 0.01 kp/cm21 kp/cm2 i 100 kPa
1 kPa i 0.145 psi 1 psi i 6.9 kPa
Calibration and functional check
 After any service intervention in Servo
Ventilator 300/300A, perform a
Calibration and Functional check
according to instructions in the
Operating Manual
Hazard notices
 Before disassembling or assembling the
Servo Ventilator 300/300A, make sure
that the:
 Gas supply is disconnected
 Mains power cable is disconnected
 Mode selector is set to Ventilator off
If the mode selector is set in any other
position, the internal battery will
supply power to the PC boards
 The back-up batteries are disconnec-
ted when the power section is open
 All gas conveying parts are cleaned
according to instructions in the
Operating Manual
Service
 When working with ESD sensitive
components, always use a grounded
wrist band and a grounded work surface
Adequate service tools must always be
used
 Some parts in the Servo Ventilator 300/
300A are comprised by a spare parts
exchange system Your local Siemens
representative supplies factory
calibrated and tested exchange parts as
well as other spare parts indicated in the
spare parts catalogue
Important
Important

Servo Ventilator 300/300A
E382 E380E 061 01 03 01 Siemens-Elema AB 3
• The Servo Ventilator 300/300A must be
serviced at regular intervals by specially
trained personnel The service intervals,
1000 and 3000 operating hours, are
described in the Operating Manual Any
maintenance must be noted in a log
book provided for that purpose in
accordance with national regulations
We recommend that service is done as
a part of a service contract with
Siemens
• A 1000 hour overhaul must be performed
after 1000 hours of operation or, at the
lastest, every six months In addition,
the ventilator shall undergo a technical
safety check (Function check) twice a
year, at six months intervals or according
to national regulations
• A 3000 hour overhaul must be performed
after every 3000 hours of operation or,
at the latest, once every year
• The internal batteries shall be replaced
every 3 years according to instructions in
this Service Manual The stated battery
back-up time, approx 30 minutes, can
be guaranteed only if they are used as
power supply back-up at mains failure
• The battery on PC 1587 COMPUTER
INTERFACE shall be replaced every 5 years
according to instructions in this Service
Manual
Important
To the responsible service personnel
• The contents of this document are not
binding If any significant difference is
found between the product and this
document, please contact Siemens for
further information
• We reserve the right to modify products
without amending this document or
advising the user
• Only Siemens authorized personnel shall
be permitted to service or repair the
Servo Ventilator 300/300A Only
Siemens-Elema exchange parts or
genuine spare parts must be used PC
boards (spare or exchange parts) must
always be kept in a package for sensitive
electronic devices
• Siemens will not otherwise assume
responsibility for the materials used, the
work performed or any possible
consequences of same
• The device complies with the
requirements of the Medical
Device Directive 93/42/EEC
• Old non-functioning batteries
and O2 cells must be returned
to the place of purchase or to
a place where they can be
disposed of properly
Batteries and O2 cells must
not be disposed of with
ordinary waste
Important
Pb

4 Siemens-Elema AB E382 E380E 061 01 03 01
Servo Ventilator 300/300A
Notes
Notes

Servo Ventilator 300/300A
E382 E380E 061 01 03 01 Siemens-Elema AB 5
Contents
1.Introduction............................................................................7
2.Description of functions.......................................................21
3.Disassembling and assembling.........................................81
4.Service procedures...............................................................13
5.Troubleshooting.....................................................................19
6.Product change history........................................................113
7.Index........................................................................................115
8.Diagrams.................................................................................121
1
2
3
4
5
6
7
8
Contents

6 Siemens-Elema AB E382 E380E 061 01 03 01
Servo Ventilator 300/300A
Notes
Notes

Servo Ventilator 300/300A Intro uction
E382 E380E 061 01 03 01 Siemens-Elema AB 7
1
1. Introduction
Main units8
Basic principles12

8 Siemens-Elema AB E382 E380E 061 01 03 01
Intro uction Servo Ventilator 300/300A
1
Main units
The Servo Ventilator 300 can be divided into
two main units:
• Control unit (1) The control unit consists
of the panel section (2) and the control
section (3)
• Patient unit (4) The patient unit consists
of the pneumatic section (5) and the
power section (6)
The patient unit and the control unit are
connected to each other with the inter-
connection cable (7)
3
7
2
1
300-A00X
4
56

Servo Ventilator 300/300A Intro uction
E382 E380E 061 01 03 01 Siemens-Elema AB 9
1
Control unit
The control unit consists of the control
section which is a housing with a number of
PC boards The panel section, attached to
the control section, is the other part of the
control unit
With the panel section removed from the
control section, the following parts are
accessible:
• Front panel controls
• PC 1614 PANEL INTERFACE (1) with PC 1588
MICROPROCESSOR MODULE and PAN-PROM
• PC 1745 AUTOMODE PANEL INTERFACE (2) Only
for SV 300A
• PC 1617 CONTROL INTERCONNECTION (3)
1
300-A01X
2
3
300-A02X

10 Siemens-Elema AB E382 E380E 061 01 03 01
Intro uction Servo Ventilator 300/300A
1
All PC boards in the control section (except
PC 1617 mentioned above) are accessible
when the control section cover is removed
These PC boards are:
• PC 1605 REFERENCE & TIMING (1) with PC
1588 MICROPROCESSOR MODULE and REF-PROM
• PC 1616 INSPIRATORY CONTROL (2) with
PC 1588 MICROPROCESSOR MODULE and MIX-
PROM
• PC board (3);
– PC 1665 COMPUTER INTERFACE DUMMY or
– Optional PC 1587 COMPUTER INTERFACE (3)
with COM-PROM
• PC 1608 MONITORING (4) with PC 1588
MICROPROCESSOR MODULE and MON-PROM
Patient unit
The upper part of the patient unit is the
pneumatic section Under the lid of the
pneumatic section you will find the:
• Inspiratory channel (1) including O2 cell
• Expiratory channel (2) including flow
transducer
The inspiratory valves (gas modules) are
located in three different slots in the
pneumatic section:
• Inspiratory valve unit – AIR (3)
• Inspiratory valve unit – O2 (4)
• Inspiratory valve unit – Optional (5)
The valve dummy in the third slot can be
replaced by an inspiratory valve for
administration of e g NO gas or by
equipment for nebulizing drugs (Servo
Ultra Nebulizer 345) These products are
described in separate documents
34
2
1
300-A03X
345
2
1
300-A04X

Servo Ventilator 300/300A Intro uction
E382 E380E 061 01 03 01 Siemens-Elema AB 11
1
When the pneumatic section casing and the
cover plate is removed, the following parts
are accessible:
• PC 1615 EXPIRATORY FLOW LINEARIZATION (1)
with PC 1588 MICROPROCESSOR MODULE and
LIN-PROM
• Housing (2) containing PC 1585 CURRENT
CONTROL and PC 1586 CURRENT POWER
• Expiratory valve (3)
• PC 1622 VALVE CONTROL (4)
• PC 1611 EXPIRATORY PRESSURE AMPLIFIER (5)
• Safety valve (6) with PC 1613 SAFETY VALVE
DRIVER
• PC 1611 INSPIRATORY PRESSURE AMPLIFIER (7)
• PC 1607 PNEUMATIC INTERCONNECTION (8)
The lower part of the patient unit is the
power section With the pneumatic section
separated from the power section the
following parts are accessible:
• Mains power inlet (1)
• External battery inlet (2)
• Operating time meter (3)
• Batteries (4)
• Transformer (5)
• Capacitor (6)
• Auxiliary equipment outputs (7)
• PC 1618 POWER SUPPLY (8)
4
5678
3
12
300-A05X
3
5678
2
1
300-A06X
4

12 Siemens-Elema AB E382 E380E 061 01 03 01
Intro uction Servo Ventilator 300/300A
1
Basic principles
12
1
45 3
6
7
10
8
911
300-F71X
2

Servo Ventilator 300/300A Intro uction
E382 E380E 061 01 03 01 Siemens-Elema AB 13
1
Gas flow through the patient unit
Inspiratory flow
1 Gas inlet for air The connected air must
have a pressure between 200 and 650
kPa (2 and 6 5 bar)
2 Gas inlet for O2 The connected O2 must
have a pressure between 200 and 650
kPa (2 and 6 5 bar)
3 The flow of the gas delivered to the
patient system is regulated by the
inspiratory valves There is one inspira-
tory valve unit (gas module) for each
gas The inspiratory valves are regulated
by a feedback control system that is
described in this chapter
4 The gases are mixed in the inspiratory
mixing part
5 The pressure of the mixed gas delivered
to the patient (inspiratory pressure) is
measured by the inspiratory pressure
transducer The transducer is protected
by a bacteria filter
6 The inspiratory pipe leads the mixed gas
from the inspiratory mixing part to the
patient system The inspiratory pipe also
contains the safety valve, a holder for the
O2 cell and the inspiratory outlet The
springloaded safety valve will open in
case of a power failure and/or if the inspi-
ratory pressure exceeds 120 cm H2O It
will also open if the set upper pressure
limit is exceeded by 5 cm H2O
7 The oxygen concentration inside the
inspiratory pipe is measured by the O2
cell The O2 cell is protected by a
bacteria filter
Expiratory flow
8 The patient system's expiratory gas tube
is connected at the expiratory inlet The
expiratory inlet also contains a moisture
trap
9 The gas flow through the expiratory
channel is measured by the expiratory
flow transducer Patient trigger efforts,
indicated by a decreased continuous
flow, are sensed by this expiratory flow
transducer
10 The expiratory pressure is measured by
the expiratory pressure transducer The
transducer is protected by a bacteria
filter Patient trigger efforts, indicated by
a pressure drop, are sensed by this
expiratory pressure transducer
11 The pressure of the gas (PEEP pressure)
in the patient system is regulated by the
expiratory valve The expiratory valve is
regulated by a feedback control system
that is described in this chapter
12 The gas from the patient system leaves
the ventilator via this expiratory outlet
The outlet contains a non-return valve
which is a part of the patient triggering
system

14 Siemens-Elema AB E382 E380E 061 01 03 01
Intro uction Servo Ventilator 300/300A
1
Feedback control system – General
Any CONTROLLING SYSTEM may comprise one
single CONTROLLER or, for instance, a cascade
of more than one CONTROLLER Compensating
elements may also be added
CONTROLLER symbol used in
this chapter
In each CONTROLLER, the actual value normally
from a TRANSDUCER in the CONTROLLED SYSTEM is
compared to the desired value = REFERENCE
VARIABLE The difference between these two
input values results at the output of the
controlling system in an ACTUATING SIGNAL
Each CONTROLLER may comprise some
combination of the following parts:
• Proportional action, P
• Integral action, I
• Derivative action, D
P-action gives a continuous basic positioning
I-action gives a slowly varying positioning
compensation for small long time deviation
D-action gives a speed-up positioning
reaction at (fast) changes
The signals from these parts (from the parts
used in the actual combination) are added
The sum is the total ERROR SIGNAL which may
be converted before use as an ACTUATING
SIGNAL
Each CONTROLLING ELEMENT (in the ventilator:
inspiratory valves and expiratory valve) is
positioned by the ACTUATING SIGNAL from its
controlling system Feedback control, which
is synonymous with regulation, results in the
controlled valve being moved into such a
position that the ACTUAL VALUE is kept equal to
the DESIRED VALUE independently of
disturbance variables like changes in the
airway resistance or lung compliance
P
D
I
CONTROLLING
ELEMENT
"COMPENSATOR"
CONTROLLING SYSTEM
COMPARING
ELEMENT
CONTROLLED SYSTEM
TRANSDUCER
ACTUAL
VALUE
ACTUATING
SIGNAL
REFERENCE
VARIABLE DESIRED VALUE "ERROR
CALCULATOR"
ERROR
SIGNAL
CONVERTER
PID-CONTROLLER
300-A08E
SIGNAL AMPLIFIER (WITH SERVO)

Servo Ventilator 300/300A Intro uction
E382 E380E 061 01 03 01 Siemens-Elema AB 15
1
Inspiratory feedback control system
The inspiratory feedback control system
uses cascade control with a number of
controllers and compensating elements
Flow regulation
Inspiratory flow regulation occurs during
inspiration time in the modes Volume
Control and SIMV (Vol Contr ) and during
expiration time in all modes
When flow regulation is used, the
shadowed main forward path comprises the
following:
• The microprocessor module in the block
MODE CPU in the main block REFERENCE &
TIMING generates a FLOW REF signal
• The block MIXER, in the main block
INSPIRATORY CONTROL, splits the FLOW REF
signal into one GAS FLOW REF signal for each
inspiratory valve (AIR FLOW REF and O2 FLOW
REF ) Each GAS FLOW REF signal is used
(after a minor correction within ±5 %) as
DESIRED GAS FLOW VALUE (reference variable)
•ACTUAL GAS FLOW VALUE is generated by
signal converters (FLOW) using signals from
measuring TRANSDUCERS
• The actuating signal from the FLOW PI
CONTROL results in the DESIRED POSITION VALUE
(reference variable) for the POSITION PD
CONTROL The POSITION SENSOR at the
INSPIRATORY VALVE generates a valve position
signal which is used as the ACTUAL POSITION
VALUE in the POSITION PD CONTROL
• The actuating signal from the POSITION PD
CONTROL results in the DESIRED CURRENT VALUE
(reference variable) for the CURRENT CONTROL
& CURRENT POWER
• The ACTUAL CURRENT VALUE is an internal
feedback signal used in the CURRENT
CONTROL block
• The actuating signal from the output stage
of the CURRENT CONTROL & CURRENT POWER is a
voltage pulse train with pulse width
modulation used to actuate the INSPIRATORY
VALVE SOLENOID which generates a certain
opening of the INSPIRATORY VALVE
Flow
regulation
POSITION
SENSOR
INSPIRATORY
VALVE
CONTROLLED SYSTEM
VALVE
SOLENOID
PRESSURE
TRANSDUCERS
FLOW
ACTUAL CURRENT VALUE
ACTUAL POSITION VALUE
ACTUAL
SUPPLY
PRESS.
VALUE
GAS
FLOW
VALVE POSITION
CALCULATOR
REFERENCE
& TIMING
DESIRED
POSITION
VALUE
CURRENT
CONTROL &
CURRENT
POWER
POSITION PD
CONTROL
FLOW PI
CONTROL
DESIRED
CURRENT
VALUE
GAS
FLOW
REF.
MIXER
DESIRED
GAS FLOW
VALUE
ACTUAL
GAS FLOW
VALUE
INSP.VALVE POSITION
FLOW
REF.
GAS
SUPPLY
PRESS.
FLOW CONTROL
300-A09E
INSPIRATORY
CONTROL

16 Siemens-Elema AB E382 E380E 061 01 03 01
Intro uction Servo Ventilator 300/300A
1
In addition to the main forward path,
compensating elements are added as
described in both inspiratory feedback
control system pictures The compensating
elements in this system works as follows:
• Using the input information of ACTUAL
SUPPLY PRESSURE VALUE and DESIRED GAS FLOW
VALUE the VALVE POSITION CALCULATOR directly
generates a rough approximate POSITION
VALUE which helps to obtain the desired
position within minimum time
• The input information of ACTUAL SUPPLY
PRESSURE VALUE is used (inverted and
adequatly scaled) to create one small part
of the DESIRED CURRENT VALUE This small part
of the DESIRED CURRENT VALUE will – in
combination with the opening force of the
INSPIRATORY VALVE implied by the pressure of
the supplied gas – help to balance the
closing force on the INSPIRATORY VALVE
implied by the mechanical spring inside
the VALVE SOLENOID even in closed position
of the INSPIRATORY VALVE

Servo Ventilator 300/300A Intro uction
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

20 Siemens-Elema AB E382 E380E 061 01 03 01
Intro uction Servo Ventilator 300/300A
1
Notes

Servo Ventilator 300/300A Intro uction
E382 E380E 061 01 03 01 Siemens-Elema AB 19
1
xpiratory feedback control system
17
The expiratory feedback control system
uses cascade control It is active only during
expiration time in all modes It applies
PRESSURE regulation
•DESIRED VALUE is the PEEP LEVEL signal from
the PANEL SECTION (according to front panel
setting)
•ACTUAL VALUE is the EXP PRESSURE signal
from the expiratory PRESSURE TRANSDUCER
• The actuating signal from the PEEP PID
CONTROL block is the POSITION REF signal
used as DESIRED VALUE for the POSITION PD
CONTROL
•ACTUAL VALUE is the EXP VALVE POSITION signal
from the POSITION SENSOR in the EXPIRATORY
VALVE
• The actuating signal from the POSITION PD
CONTROL block is the EXP VALVE CURRENT REF
signal used as DESIRED VALUE for the CURRENT
CONTROL & CURRENT POWER block
• The ACTUAL CURRENT VALUE is an internal
feedback signal used in the CURRENT
CONTROL block
• The actuating signal from the output stage
of the CURRENT CONTROL & CURRENT POWER is a
pulse train with pulse width modulation
used to actuate the EXPIRATORY VALVE
SOLENOID which generates a certain
opening of the EXPIRATORY VALVE
POSITION
SENSOR
EXPIRATORY
VALVE
CONTROLLED SYSTEM
VALVE
SOLENOID
PRESSURE
TRANSDUCER
PEEP PID
CONTROL
CURRENT
CONTROL
&
CURRENT
POWER
POSITION PD
CONTROL
DESIRED EXPIRATORY
PRESSURE VALUE
EXP. VALVE
CURRENT REF.
PRESSURE CONTROL
ACTUAL POSITION VALUE
POSITION
REF.
ACTUAL
EXPIRATORY
PRESSURE
VALUE
PEEP LEVEL
EXP. VALVE POSITION
ACTUAL CURRENT VALUE
DESIRED
CURRENT
VALUE
DESIRED
POSITION
VALUE
EXP.
PRESSURE
300-A11E

18 Siemens-Elema AB E382 E380E 061 01 03 02
Introduction Servo Ventilator 300/300A
Principle diagram
M
+5V
±15V
+24V
O2
LM
V
M
C
MP
C
T
TI
M
M
O
M
A
W
X
P
G
H
11
9
8
7
6
5
4
3
2
1
10
12
TRANS-
DUCERS
TRANS-
DUCERS
TO
PATIENT
INSP. PRESSURE
POWER SUPPLY INTERNAL
BATTERY
EXT. BATTERY
MAINS POWER
AIR
O2CONC.
AMPLIFIER
PRESSURE
CONTROL
FROM
PATIENT
EXP.
FLOW
VALVE CONTROL EXPIRATORY
VALVE
O2CONC.
PATIENT UNIT
O2FLOW REF.
CONTROL UNIT
PRESSURE
PID CONTROL
Pressure
INSPIRATORY CONTROL
MODE CPU
Flow
SELECTION OF
PRESSURE OR
FLOW REGULATION
PRESSURE REF.
FLOW REF.
FLOW REF.
INSP. PRESSURE
COMPUTER INTERFACE
INPUT SIGNALS
INPUT SIGNALS
INPUT FROM
SV 300 INTERNAL
MICROPROCESSORS
EXTERNAL
CONTROL
SIGNALS
EXTERNAL
OUTPUT
SIGNALS
CONTROL
SIGNALS
MONITORING
REFERENCE & TIMING
MIXER
O2FLOW REF.
AIR FLOW REF.
PEEP LEVEL
O
2
CELL FLOW
CONTROL
INSPIRATORYVALVE UNIT - O2
FLOW
CONTROL AIR FLOW REF.
INSPIRATORYVALVE UNIT - AIR
PRESSURE
AMPLIFIER
PRESSURE
AMPLIFIER
EXP. PRESSURE
300-A12E