Drager_Savina_-_Service_manual

5664.9009036060Revision 9.0Technical Documentation

Savina Intensive Care Ventilator

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C o p y r i g h t r e s e r v e d .

K 5664900I E C I V Z .f m 28.04.08

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Contents

General

1Symbols and Definitions 62

Notes

6

Function Description

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General 101.1Functional principle ..............................................................................................................101.2Monitoring .............................................................................................................................101.3Block diagrams (122)

Principal components 142.1Electronics ............................................................................................................................152.2Control panel with black/white display ..................................................................................192.3Control panel with TFT display .............................................................................................202.4Pneumatic assembly (23)

Maintenance Procedures

1General notes

302Replacing the microfilter 313Replacing the dust filter set 334Replacing the O2 sensors 355Replacing the filter in the O2 inlet

366

Replacing the lead-gel battery (internal battery)

42

Schematics and Diagrams

1Front view, Savina 482Rear view, Savina

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3

Identification of PCBs 533.1O2 Valve PCB ......................................................................................................................533.2Control PCB .........................................................................................................................553.3Front Panel PCB ..................................................................................................................563.4O2 Diaphragm PCB ..............................................................................................................574Pneumatic diagrams 595

Tubing diagram

61

Annex

Parts catalog Test instructions (TL)Technical Information

C o p y r i g h t r e s e r v e d .K 5664900I E C I V Z .f m 28.04.084Contents

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General

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4.0_P r i n t e d o n _28.04.08_K 5664900_G e n e r a l.f m 65664.900General Savina 1Symbols and Defini-

tions 2Notes This Technical Documentation conforms to the IEC 60601-1 standard.

Read each step in every procedure thoroughly before beginning any test.

Always use the proper tools and specified test equipment.

The maintenance procedures described in this Technical Documentation may

be performed by properly trained service personnel only. These maintenance

procedures do not replace inspections and servicing by the manufacturer.

This Technical Documentation is for informational purposes only. Product

information contained in this Technical Documentation does not supersede

Product information provided in the Instructions for Use enclosed with the

product at the time of delivery.

WARNING

A WARNING statement provides important information about a poten-

tially hazardous situation which, if not avoided, could result in death

or serious injury.

CAUTION

A CAUTION statement provides important information about a potentially

hazardous situation which, if not avoided, may result in minor or moderate

injury to the user or patient or in damage to the equipment or other prop-

erty.

NOTE

A NOTE provides additional information intended to avoid inconvenience

during operation or servicing of the equipment.

Definitions:

Inspection =examination of actual condition

Maintenance =measures to maintain specified condition

Repair =measures to restore specified condition

Servicing =inspection, maintenance, and repair

CAUTION

If you deviate from the instructions and/or recommendations in this Techni-

cal Documentation, the equipment may operate improperly or unsafely, or

the equipment could be damaged.

CAUTION

Dr?ger recommends that only Dr?ger supplied repair parts be used for

maintenance. Otherwise the correct functioning of the device may be com-

promised.

5664.9004.0_P r i n t e d o n _28.04.08_K 5664900_G e n e r a l.f m 7Savina General NOTE

Unless otherwise stated, reference is made to laws, regulations or stan-

dards (as amended) applicable in the Federal Republic of Germany for

equipment used or serviced in Germany. Users or technicians in all other

countries must verify compliance with local laws or applicable international

standards.

NOTE

If the test values are not met, please contact your local service organiza-

tion.

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Function Description

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5664.900

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Savina Function description

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Function description 1.3.1

Savina with black/white display (b/w display)Fig. 1 Block diagram of the electronics with control panel (black/white display)

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Savina with TFT display Fig. 2 Block diagram of the electronics with control panel (TFT display)

2Principal compon-ents The Savina consists of the electronics, the control panel, and the pneumatic

assembly, containing the following principal components:

Electronics Control panel Pneumatic assem-

bly

Power supply unit Display:Control panel with

black/white display

Control panel with TFT dis-

play

Plug-in unit

Control PCB Valve block

Motor Commutation PCB

Inspiratory block

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2.1.2Control PCB The Control PCB is the central “control and monitoring unit” of the Savina. It

includes two separate processor systems, the master and front processors.

The program memories are flash EPROMs. The flash EPROMs can be pro-

grammed with a laptop connected to the serial port of the Savina (software

download).

An EEPROM is provided for each processor system for storage of change-

able, non-volatile data. The EEPROM of the master stores the calibration

data of the sensors, fan, etc. The EEPROM of the front processor stores

safety parameters, settings such as contrast, sound volume, etc., as well as a

“backup copy” of the operating hours. The EEPROM of the front processor is

plugged in and, if the board needs to be replaced, must be mounted on the

new board.

The board is provided with a real-time clock which is used to display the time

and to store the software options, the unit identification and the operating

hours. The real-time clock is buffered by a battery which is integrated in the

real-time clock. The real-time clock also holds the logbook. The real-time

clock is plugged in and, if the board needs to be replaced, must be mounted

on the new board.

The Control PCB contains the following functions:

–Processing of the signals from the sensors (O2, flow, pressure, tempera-

ture),

–Control of the blower and valves,

–Monitoring of the unit functions and the supply voltages,

–Actuation of the displays,

–Keypad interpretation,

–Provision of the internal and external interfaces.

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Control PCB block diagram

2.1.3Motor Commutation PCB The Motor Commutation PCB controls the motor of the blower. The entire

control functionality is located in a self-contained housing. The supply voltage

is +48 V, and is delivered by the power supply unit. The +48V on the Motor

Commutation PCB are protected with a fuse (6.3AT).

The input voltage range of the Motor Commutation PCB is 12 to 52.5 V. The

rotation speed is set by the Control PCB. The control voltage for the rotation

speed is 0 to +5.00 V, corresponding to a rotation speed of 0 to 12,000 rpm.

The rotation speed range is 4000 to 12,000 rpm.

The Motor Commutation PCB delivers the “actual rotation speed signal” to

the Control PCB. The “actual value signal” is 6 pulses per rotation. In the

event of discrepancies in the rotation speed the Control PCB adjusts the

speed according to the deviation.

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Fig. 4

Block diagram of the Motor Commutation PCB

2.1.4O2 Valve PCB The O2 Valve PCB holds the pressure sensors (2x absolute pressure S6 and

S7, 1x O2 supply pressure S5), the actuator for the O2 calibrating valve and

the nebulizer valve, and the actuator for the valve bank.

The signals from the pressure sensors are amplified and passed to the Con-

trol PCB. The +5 V voltage supply to the pressure sensors is generated on

the O2 Valve PCB.

The valves in the valve bank, the O2 calibrating valve and the nebulizer valve

can be operated inpidually by an electronic switch. They are actuated by the

Control PCB.

Fig. 5 Block diagram of the O2 Valve PCB

2.1.5O2 Diaphragm PCB The O2 Diaphragm PCB amplifies the signals from the O2 sensors and mea-

sures the temperature of the O2 sensors and of the respiratory gas in the

inspiration block. The temperature of the O2 sensors is required to compen-

sate for the temperature-sensitive O2 measurements. The calibration data

from the sensors are stored on the Control PCB in an EEPROM. The refer-

ence voltage of the O2 sensors is generated from the voltage of the

rechargeable batteries, and so is also available when the unit is switched off.

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The operating voltages of the O2 Diaphragm PCB are +5 V and +15 V.

Fig. 6 Block diagram of the O2 Diaphragm PCB

2.1.6Fan The fan takes in ambient air through the cooler of the blower and cools the

blower. The air flow also removes excessive oxygen from the device.

The voltage supply to the fan is +24V. The rotation speed of the fan is con-

trolled by the Control PCB.

Fig. 7 Fan control

2.2

Control panel with black/white display 2.2.1Control panel The control panel is the interface between the unit and the user. The ventila-

tion parameters are entered via the control panel and displayed on the

black/white display (b/w display).

Fig. 8 Block diagram of the control panel with black/white display

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The Front Panel PCB contains the 7-segment displays for the pre-set ventila-

tion parameters, the drivers for the key LEDs, the drivers for interpretation of

the keys and the shaft encoder, and the voltage generator for backlighting of

the black/white display. The voltage generation for the backlighting can be

switched on and off from the Control PCB.

Fig. 9 Block diagram of the Front Panel PCB

2.2.3Membrane keypad The membrane keypad features the control keys and the associated LEDs.

2.2.4Black/white display (b/w display)The black/white display (b/w display) displays the patient parameters and the

warning messages. The black/white display is actuated by the Control PCB;

the black/white display backlighting is actuated by the Front Panel PCB. The

resolution of the black/white display is 240x128 pixels. The voltage supply is

+5 V and -15 V.

2.2.5Rotary knob The rotary knob is used to set and acknowledge the ventilation parameters.

The rotary knob transmits square signals to the Front Panel PCB as it rotates,

and the signals are then evaluated by the Control PCB. The voltage supply is

+5 V.

2.3Control panel with

TFT display

2.3.1Control panel The control panel is the interface between the unit and the user. It is used to

enter and display the ventilation parameters.

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Fig. 10

Block diagram of the control panel with TFT display

2.3.2Front Panel 2 PCB The Front Panel 2 PCB contains the 7-segment displays for the pre-set venti-

lation parameters, the drivers for the key LEDs, and the drivers for interpreta-

tion of the keys and the rotary knob.

Fig. 11 Block diagram of Front Panel 2 PCB

2.3.3

Membrane keypad The membrane keypad features the control keys and the associated LEDs.2.3.4

TFT display The TFT display comprises the display, the Lucina 2 PCB, and the backlight-ing inverter.The TFT display has a resolution of 800x480 pixels.The Lucina 2 PCB (control board) is connected to the Control PCB by means of a 20-pin ribbon cable. The Lucina 2 PCB has a FPGA (field programmable gate array) which converts the 240x128 black/white picture into 720x384 color picture and displays it on the TFT display. One black/white pixel is dis-played as 9 (3x3) pixels on the color display. Color conversion is not carried

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