VIASYS Vela Service Manual

Service Manual

Vela

Ventilator Systems

L1534 Revision B December 2004

Revision History

Date Revision Pages Changes

March 2002 X1 All Initial Draft

April 2002 X2 All Added Engineering Drawings,

Theory of Operation, Calibration
and PM procedures

June 2002 X3 All Added Extended Functions and

UVT Test Screens. Added Error
Codes.

August 2002 A All Final review & engineering

release. Modified OVP,
Calibration and screens.

December 2004 B 39 Replaced Figure 3.13 Umbrella

Check Valve with Figure 3.13
Umbrella Check Valve (P/N

21950)

L1534 Revision B December 2004

Service Manual 3

Warranty

THE Vela ventilator systems are warranted to be free from defects in material and workmanship and to
meet the published specifications for two (2) years or 8,000 hours, whichever occurs first. The turbine
only is warranted to be free from defects in material or workmanship for five (5) years or 40,000 hours
whichever occurs first.

The liability of VIASYS Healthcare, Critical Care Division, (referred to as the Company) under this
warranty is limited to replacing, repairing or issuing credit, at the discretion of the Company, for parts
that become defective or fail to meet published specifications during the warranty period; the Company
will not be liable under this warranty unless (A) the Company is promptly notified in writing by Buyer
upon discovery of defects or failure to meet published specifications; (B) the defective unit or part is
returned to the Company, transportation charges prepaid by Buyer; (C) the defective unit or part is
received by the Company for adjustment no later than four weeks following the last day of the warranty
period; and (D) the Company’s examination of such unit or part shall disclose, to its satisfaction, that
such defects or failures have not been caused by misuse, neglect, improper installation, unauthorized
repair, alteration or accident.

Any authorization of the Company for repair or alteration by the Buyer must be in writing to prevent
voiding the warranty. In no event shall the Company be liable to the Buyer for loss of profits, loss of
use, consequential damage or damages of any kind based upon a claim for breach of warranty, other
than the purchase price of any defective product covered hereunder.

The Company warranties as herein and above set forth shall not be enlarged, diminished or affected
by, and no obligation or liability shall arise or grow out of the rendering of technical advice or service by
the Company or its agents in connection with the Buyer's order of the products furnished hereunder.

Limitation of Liabilities

This warranty does not cover normal maintenance such as cleaning, adjustment or lubrication and
updating of equipment parts. This warranty shall be void and shall not apply if the equipment is used
with accessories or parts not manufactured by the Company or authorized for use in writing by the
Company or if the equipment is not maintained in accordance with the prescribed schedule of
maintenance.

The warranty stated above shall extend for a period of FIVE (5) years from date of shipment or 40,000
hours of use, whichever occurs first, with the following exceptions:

1. Components for monitoring of physical variables such as temperature, pressure, or flow are
warranted for ninety (90) days from date of receipt.

2. Elastomeric components and other parts or components subject to deterioration, over which the
Company has no control, are warranted for sixty (60) days from date of receipt.

3. Internal batteries are warranted for ninety (90) days from the date of receipt.

The foregoing is in lieu of any warranty, expressed or implied, including, without limitation, any warranty
of merchantability, except as to title, and can be amended only in writing by a duly authorized
representative of the Company.

L1534 Revision B December 2004

4 Vela Ventilators

Contents

Revision History ..............................................................................................................2

Warranty .........................................................................................................................................3

Limitation of Liabilities..................................................................................................................................3

Notices..............................................................................................................................9

Copyright Notice............................................................................................................................9

Trademark Notices.........................................................................................................................9

EMC Notice.....................................................................................................................................9

MRI Notice ....................................................................................................................................10

Intended Use Notice ....................................................................................................................10

Regulatory Notice ........................................................................................................................10

IEC Classification ........................................................................................................................10

Declaration of Conformity Notice...............................................................................................10

Safety Information .........................................................................................................11

Terms............................................................................................................................................11

Warnings ......................................................................................................................................11

Cautions .......................................................................................................................................12

Equipment Symbols ......................................................................................................13

Chapter 1 Introduction .................................................................................................15

General Instructions....................................................................................................................15

Recommended Tools & Equipment............................................................................................15

Recommended Maintenance Schedules....................................................................................16

Schedules..................................................................................................................................................16

Chapter 2 Theory of Operation.....................................................................................17

General Device Description ........................................................................................................17

Pneumatic System Overview ......................................................................................................17

Flow Delivery System ................................................................................................................................17

Exhalation System.....................................................................................................................................17

Safety System ...........................................................................................................................................18

Inspiratory Hold Valve................................................................................................................................18

Oxygen Blending System............................................................................................................18

Electronic Overview.....................................................................................................................18

L1534 Revision B December 2004

Service Manual 5

User interface module (UIM) .....................................................................................................................18

Power System ...........................................................................................................................................20

Main Controller System .............................................................................................................................20

The Watchdog Timer and Hardware Fault.................................................................................................21

Exhalation System..................................................................................................................................... 21

Flow Delivery System................................................................................................................................ 21

Oxygen Blending System ..........................................................................................................................22

Chapter 3 Disassembly & Assembly.......................................................................... 23

General Instructions and Warnings........................................................................................... 23

Required Tools ............................................................................................................................ 24

Disassembly and Reassembly Procedures............................................................................... 24

Power Cable..............................................................................................................................................24

Top Cover Part number 15893 .................................................................................................................. 25

Battery Tray Part Number 10633...............................................................................................................26

PCMCIA Cards............................................................................................................................. 28

Left Panel ..................................................................................................................................... 28

Right Panel Containing the Power PCB P/N 15894 .................................................................. 29

Front Panel Part number 15869.................................................................................................. 32

Parts List – Front Panel Part Number 15869.............................................................................................33

Main PCB (on Front Panel) P/N 52130 .......................................................................................34

Flow Sensor PCB assembly P/N 15991 .....................................................................................37

Exhalation Valve Assembly P/N 15871 ...................................................................................... 38

Inspiratory Hold Solenoid and Check Valve Assembly P/N 10346.......................................... 39

Manifold Base assembly............................................................................................................. 40

Oxygen Sensor part number 15972 ........................................................................................... 43

Rear Panel part number 15892................................................................................................... 44

Turbine and Muffler Assembly................................................................................................... 47

Over Pressure Relief Valve assembly ....................................................................................... 48

Turbine Motor Driver PCB part number 71597.......................................................................... 49

Muffler/Filter Assemblies part number 10364........................................................................... 50

Removal ....................................................................................................................................................50

Blender Assembly Part Number 15895...................................................................................... 51

Fan Assembly part number 15500 ............................................................................................. 53

Chapter 4 Operational Verification and Calibration ............................................... 55

L1534 Revision B December 2004

6 Vela Ventilators

Operational Verification Testing.................................................................................................55

Lamp Test..................................................................................................................................................56

Switch Test ................................................................................................................................................56

Alarm Test .................................................................................................................................................57

Filter Test...................................................................................................................................................57

Leak Test...................................................................................................................................................58

Exit.............................................................................................................................................................58

Extended Functions.....................................................................................................................59

Events........................................................................................................................................................60

Transducer Data........................................................................................................................................61

Transducer Tests.......................................................................................................................................62

Version Information ...................................................................................................................................64

Date & Time...............................................................................................................................................65

FiO2 Calibration.........................................................................................................................................66

Ventilator Setup .........................................................................................................................................66

Low Min Volume Off ..................................................................................................................................67

Locks Disabled ..........................................................................................................................................68

FiO2 Monitor Disabled...............................................................................................................................68

Altitude Adjustment....................................................................................................................................69

Language Selection...................................................................................................................................70

Verification tests..........................................................................................................................71

Vela Ventilator Performance Checklist ......................................................................................73

Calibration....................................................................................................................................75

Test Set-up................................................................................................................................................75

Power Up Verification/Service Verification Tests.......................................................................................75

Exhalation Pressure Transducer ...............................................................................................................77

Turbine Pressure Transducer....................................................................................................................78

Exhalation Flow Transducer Calibration ....................................................................................................80

Oxygen Pressure Transducer Calibration..................................................................................................81

Regulator calibration:.................................................................................................................................83

Oxygen Sensor Calibration.........................................................................................................86

Chapter 5 Maintenance & Troubleshooting ...............................................................89

Routine Maintenance Procedures ..............................................................................................89

Replacing the software PCMCIA cards .....................................................................................................89

Replacing the external A/C fuses. .............................................................................................................90

L1534 Revision B December 2004

Service Manual 7

The Annual 5000 hour P.M. Procedure...................................................................................... 91

Replacing the ambient air filter. .................................................................................................................91

Replacing the fan filter...............................................................................................................................91

Replacing the filter, retaining ring & check valve on the low pres O2 fitting ..............................................92

Replacing the filter, retaining ring and check valve on the hi pressure fitting ............................................92

Replacing the muffler and muffler filter assemblies ...................................................................................93

Replacing the left panel w/power PCB. .....................................................................................................95

Troubleshooting.......................................................................................................................... 96

If The Ventilator Does not Turn ON ...........................................................................................................96

Reviewing the Transducer Waveforms ..................................................................................... 97

Appendix A Contact & Ordering Information............................................................ 99

How to Call for Support .............................................................................................................. 99

Ordering Parts ........................................................................................................................... 100

Appendix B Diagrams & Schematics ........................................................................ 101

Appendix C Specifications........................................................................................ 105

Oxygen Supply .......................................................................................................................... 105

High Pressure Connector ........................................................................................................................105

Low Pressure Connector......................................................................................................................... 105

Electrical Supply ....................................................................................................................... 105

AC Power Supply ....................................................................................................................................105

DC Power Supply ....................................................................................................................................105

Data Input / Output.................................................................................................................... 106

Analog Inputs ..........................................................................................................................................106

Analog Outputs........................................................................................................................................ 106

Digital Communication.............................................................................................................................107

Printer......................................................................................................................................................107

Remote Nurse Call ..................................................................................................................................107

Video Output ...........................................................................................................................................107

Atmospheric & Environmental Specifications........................................................................ 107

Temperature and Humidity...................................................................................................................... 107

Barometric Pressure................................................................................................................................ 108

Physical Dimensions ................................................................................................................ 108

Overall Size .............................................................................................................................................108

Weight .....................................................................................................................................................108

L1534 Revision B December 2004

8 Vela Ventilators

Appendix D Service Event Codes ..............................................................................109

Appendix E Error Messages...............................................Error! Bookmark not defined.

Glossary .......................................................................................................................112

Index .............................................................................................................................114

L1534 Revision B December 2004

9 Vela Ventilators

Notices

Copyright Notice

Copyright © 2001 VIASYS Healthcare, Critical Care Division, California.

This work is protected under Title 17 of the U.S. Code and is the sole property of the Company. No part
of this document may be copied or otherwise reproduced, or stored in any electronic information
retrieval system, except as specifically permitted under U.S. Copyright law, without the prior written
consent of the Company. For more information, contact:

World Headquarters European Office

1100 Bird Center Drive Rembrandtlaan 1b

Palm Springs, CA 92262-8099 3723 BG Bilthoven

U.S.A. P.O. Box 299, 3720 AG Bilthoven

Phone: [phone] The Netherlands

[phone] Phone: [phone]

Fax: [phone] Fax: [phone]

www.ViasysCriticalCare.com

Trademark Notices

Vela is a registered trademark of VIASYS Healthcare, Critical Care Division in the U.S. and some
other countries. All other brand names and product names mentioned in this manual are trademarks,
registered trademarks, or trade names of their respective holders.

EMC Notice

This equipment generates, uses, and can radiate radio frequency energy. If not installed and used in
accordance with the instructions in this manual, electromagnetic interference may result. The
equipment has been tested and found to comply with the limits set forth in EN60601-1-2 for Medical
Products. These limits provide reasonable protection against electromagnetic interference when
operated in the intended use environments described in this manual.

The ventilator has been tested to conform to the following specifications:

MIL-STD-461D:1993, MIL-STD-462D:1993, EN55011:1991, IEC 1000-4-2:1994, IEC 1000-4-3:1994,
IEC 1000-4-4:1994, IEC 1000-4-5:1994, QUASI-STATIC:1993

This ventilator is also designed and manufactured to comply with the safety requirements of IEC 601-1,
IEC 601-2-12, CAN/CSA-C22.2 No. 601.1-M90, and UL 2601-1.

L1534 Revision B December 2004

10 Vela Ventilators

MRI Notice

This equipment contains electromagnetic components whose operation can be affected by intense
electromagnetic fields.

Do not operate the ventilator in a MRI environment or in the vicinity of high-frequency surgical
diathermy equipment, defibrillators, or short-wave therapy equipment. Electromagnetic interference
could disrupt the operation of the ventilator.

Intended Use Notice

The Vela Ventilators are designed to provide ventilator support for the critical care management of
infant, pediatric or adult patients with compromised lung function. They are intended to provide
continuous respiratory support in an institutional health care environment. They should only be

operated by properly trained clinical personnel, under the direction of a physician.

Regulatory Notice

Federal law restricts the sale of this device except by or on order of a physician.

IEC Classification

Type of Equipment: Medical Equipment, Class 1 type B

Adult/Pediatric/Infant Lung Ventilator

Declaration of Conformity Notice

This medical equipment complies with the Medical Device Directive,
93/42/EEC, and the following Technical Standards, to which
Conformity is declared:

EN60601-1
EN60601-1-2
ISO 9001, EN 46001

EU Notified Body:

BSI (Reg. No. 0086)

Tradenames:

Vela

If you have a question regarding the Declaration of Conformity for this product, please contact VIASYS
Healthcare, Critical Care Division at the number given in Appendix A.

L1534 Revision B December 2004

Service Manual Front Matter 11

Safety Information

Please review the following safety information prior to operating the ventilator. Attempting to

operate the ventilator without fully understanding its features and functions may result in unsafe
operating conditions.

Warnings and Cautions which are general to the use of the ventilator under all circumstances are
included in this section. Some Warnings and Cautions are also inserted within the manual where they
are most meaningful.

Notes are also located throughout the manual to provide additional information related to specific
features.

If you have a question regarding the installation, set up, operation, or maintenance of the ventilator,
contact VASYS Healthcare Customer Care as shown in Appendix A, Contact & Ordering Information.

Terms

WARNINGS identify conditions or practices that could result in serious adverse reactions or

potential safety hazards.

CAUTIONS identify conditions or practices that could result in damage to the ventilator or other

NOTES identify supplemental information to help you better understand how the ventilator

Warnings

Warnings and Cautions appear throughout this manual where they are relevant. The Warnings and
Cautions listed here apply generally any time you operate the ventilator.

• The Vela Ventilator is intended for use by a trained practitioner under the direction of a

• When the ventilator is connected to a patient, a trained health care professional should be in

• Alarm loudness must be set above ambient sound in order to be heard.

• Always have an alternate means of ventilation available whenever the ventilator is in use.

• The operator should not touch the electrical connectors of the ventilator or accessories, and

• Due to possible explosion hazard, the ventilator should not be used in the presence of

equipment.

works.

qualified physician.

attendance at all times to react to an alarm or other indications of a problem.

the patient simultaneously.

flammable anesthetics.

• An audible alarm indicates an anomalous condition and should never go unheeded.

• Anti-static or electrically conductive hoses or tubing should not be used within the patient

circuit.

• If a mechanical or electrical problem is recognized while running the Operational Verification
Tests, or while operating the ventilator, the ventilator must be removed from use and referred
to qualified personnel for servicing. Using an inoperative ventilator may result in patient injury.

L1534 Revision B December 2004

12 Vela Ventilators

• When a low gas supply alarm occurs, the oxygen concentration delivered to the patient will
differ from that set on the O2 control setting.

• A source gas failure will change the FIO2 and may result in patient injury.

• The functioning of this equipment may be adversely affected by the operation of other

equipment nearby, such as high frequency surgical (diathermy) equipment, defibrillators,
short-wave therapy equipment, “walkie-talkies,” or cellular phones.

• Water in the air supply can cause malfunction of this equipment.

• Do not block or restrict the Oxygen bleed port located on the instrument back panel.

Equipment malfunction may result.

• Electric shock hazard - Do not remove any of the ventilator covers or panels. Refer all
servicing to an authorized VIASYS Healthcare service technician.

• A protective ground connection by way of the grounding conductor in the power cord is
essential for safe operation. Upon loss of protective ground, all conductive parts including
knobs and controls that may appear to be insulated, can render an electric shock. To avoid
electrical shock, plug the power cord into a properly wired receptacle, use only the power cord
supplied with the ventilator, and make sure the power cord is in good condition.

Cautions

The following cautions apply any time you work with the ventilator.

• When replacing fuses, ensure that new fuses are of the same type and value as those being
replaced. Incorrect fuses can cause damage to the ventilator.

• A battery that is fully drained (i.e. void of any charge) may cause damage to the ventilator and
should be replaced.

• All accessory equipment that is connected to the ventilator must comply with
CSA/IEC601/UL2601.

• To avoid damage to the equipment, clean the air filter regularly.

The following cautions apply when cleaning the ventilator or when sterilizing ventilator
accessories.

• Do not sterilize the ventilator. The internal components are not compatible with sterilization
techniques.

• Do not gas sterilize or steam autoclave tubing adapters or connectors in place. The tubing will,
over time, take the shape of the adapter, causing poor connection and possible leaks.

• DO NOT submerge the ventilator or pour cleaning liquids over or into the ventilator.

L1534 Revision B December 2004

Service Manual Front Matter 13

Equipment Symbols

The following symbols may be referenced on the ventilator or in accompanying documentation

Symbol Source/Compliance Meaning

Symbol #03-02 IEC 60878 Indicates ATTENTION, consult ACCOMPANYING DOCUMENTS

Symbol #5016 IEC 60417

Symbol #5034 IEC 60417

Symbol #01-36 IEC 60878

Symbol #5035 IEC 60417

Symbol #01-37 IEC 60878

Symbol #5019 IEC 60417

Symbol #01-20 IEC 60878

Symbol #5021 IEC 60417

Symbol # 01-24 IEC 60878

Symbol # 5333 IEC 60417

Symbol #02-03 IEC 60878

Symbol #5032 IEC 60417

Symbol #01-14 IEC 30878

Symbol# 5049 IEC 60417

Symbol #5007 IEC 60417
Symbol #01-01 IEC 60878

Symbol #5008 IEC 60417
Symbol #01-02 IEC 60878

This symbol indicates a FUSE.

This symbol indicates INPUT.

This symbol indicates OUTPUT

This symbol indicates protective EARTH (ground).

This symbol indicates the EQUIPOTENTIAL connection used to
connect various parts of the equipment or of a system to the same
potential, not necessarily being the earth (ground) potential (e.g., for
local bonding).

This symbol indicates TYPE BH equipment, which indicates equipment
that provides a particular degree of protection against electric shock,
particularly with regards to allowable leakage current and reliability of
the protective earth connection.

This symbol indicates the equipment is suitable for alternating current.

This Symbol indicates the ON condition for a part of the equipment.
When pressed the ventilator will operate from the MAINS voltage (if
connected) or internal or external batteries if the battery charge is
within operating specifications.

Indicates ON (Power)

Indicates OFF (Power)

Horizontal return with line feed. Indicates ACCEPT entered values for
a specific field.

This symbol indicates CANCEL. Do not accept entered values. The
ventilator continues to operate at previous settings.

Pressing the button with this symbol will FREEZE the current display.

This symbol indicates a CONTROL LOCK.

ACCEPT

CANCEL

Symbol #0651 ISO 7000

Graphical Symbol in
general use internationally
for “DO NOT”

Symbol #5467 IEC 60417

Symbol #5569 IEC 60417

L1534 Revision B December 2004

14 Vela Ventilators

Symbol Source/Compliance Meaning

VIASYS Healthcare symbol

This symbol represents a NEBULIZER.

Symbol #5319 IEC 60417

Symbol #5307 IEC 60417

VIASYS Healthcare symbol

This symbol indicates ALARM SILENCE

This symbol indicates ALARM RESET

Increase OXYGEN

VIASYS Healthcare symbol

Symbol #5031 IEC 60417

Indicates VARIABLE ORIFICE FLOW SENSOR

This symbol indicates DIRECT CURRENT (DC)

Symbol #5546 IEC 60417

This symbol indicates the INTERNAL BATTERY STATUS display

VIASYS Healthcare symbol

This symbol indicates INSPIRATORY HOLD

VIASYS Healthcare symbol

This symbol indicates EXPIRATORY HOLD

VIASYS Healthcare symbol

This symbol indicates MANUAL BREATH

L1534 Revision B December 2004

Chapter 1 Introduction

General Instructions

When disassembling or assembling the Vela, refer to the pneumatic schematic, tubing diagram, and the
wiring diagram shown in Appendix B and the appropriate schematics and assembly drawings for each
assembly. The illustrations shown in this manual are for reference only, current revisions of these
diagrams and schematics are available to qualified personnel from VIASYS Healthcare, Critical Care
Division, Technical Support.

Always take standard ESD precautions when working on Vela ventilator systems.

Ensure the ventilator is disconnected from the AC power supply before performing and repairs or
maintenance. When you remove any of the ventilator covers or panels, immediately disconnect the
internal battery “quick release” connector (see figure 3.1) before working on the ventilator.

Recommended Tools & Equipment

Note

Before using any test equipment [electronic or pneumatic] for calibration procedures, the accuracy of the
instruments must be verified by a testing laboratory. The laboratory master test instruments must be traceable to
the NIST (National Institute of Standards Technology) or equivalent.
When variances exist between the indicated and actual values, the calibration curves [provided for each
instrument by the testing laboratory] must be used to establish the actual correct values. This certification
procedure should be performed at least once every six months. More frequent certification may be required
based on usage.

Long & short Philips screwdrivers

Flat bladed screwdriver

¼” Nut Dirver

5/16” Nut Driver

7/8” Nut Driver

11/32” Nut Drivel

Digital Volt Meter

Tack puller or Needle nosed pliers

Diagonal cutters

1” and ¾” open ended wrenches

Pressure Manometer (cmH2O and psig)

Adult Test Lung P/N 33754

Adult Patient Circuit P/N 10684

Variable Orifice Flow Sensor assembly P/N 15972

Valve Body P/N 20005

Tapered nipple P/N 00680

Hex nut P/N 00822

Regulator P/N 6754

1/8” ID Tubing tee P/N 00358 D (10pk)

1/8” ID silicone tubing P/N 04029 X (50ft)

L1534 Revision B December 2004

16 Vela Ventilators

Recommended Maintenance Schedules

Schedules

Every 500 hours , the fan and ambient air filters should be cleaned and replaced if necessary.

Every 5000 hours, VIASYS recommends that the following Preventive Maintenance procedure be

performed (see chapter 4 for instructions). This procedure includes:

• Replacement of the fan filter, the ambient air filter, the cone filters in the high & low pressure
gas inlets and the turbine mufflers/filter.

• Perform verification procedures described in Chapter 4

• Calibration of the transducers & solenoids if necessary.

Every 10,000 hours or every two years, whichever occurs sooner, the internal oxygen sensor should
be replaced.

Maintenance on the Vela should only be carried out by a trained and authorized service technician.
VIASYS Healthcare will make available to qualified technicians, service manuals and such items as
circuit diagrams, component parts lists, calibration instructions and other information to assist in repair
of those parts of the ventilator designated by the manufacturer as repairable items.

The drawings, diagrams and schematics included in this manual are for reference only and may be
updated separately from this manual after publication. For current revisions of all documentation,
contact VIASYS Healthcare Tech Support at the numbers provided in Appendix A.

L1534 Revision B December 2004

Chapter 2 Theory of Operation

General Device Description

The Vela Ventilator uses a revolutionary turbine gas delivery system with sophisticated microprocessor
control. Its Graphical User Interface provides support for pediatric to adult patients. The Vela can
deliver clinically advanced modes of ventilation like Pressure Support and can be powered with an
internal battery or AC power for an more extensive patient range.

Pneumatic System Overview

The Vela ventilator pneumatic system is electromechanical and is comprised of four major subsystems,
each containing several components. These systems are the flow delivery system, the exhalation
system, the safety system and the inspiratory hold valve. Individual subsystems are discussed in detail
below.

Flow Delivery System

This electromechanical system controls all inspiratory flow to the patient. The system delivers flow to
satisfy criteria for many breath types, including volume controlled, pressure controlled, and pressure
supported. The system comprises a turbine, differential pressure transducer, 2 auto-zero valves, and an
optical encoder speed transducer. When a breath is initiated, the controller controls the speed of the
turbine to achieve the required flow rate.

The speed and differential pressure transducer signals function as control inputs to ensure that the
proper flow rate is delivered even when backpressure varies. Periodically, the auto zero valves activate
to reference both sides of the differential pressure transducer to ambient pressure. The offset is
recorded by the controller, and is used as a correction for future pressure measurements. This
compensates for long term and temperature drift. Materials exposed to patient gases include
compatible plastics, aluminum, and plated steel.

Exhalation System

The exhalation system controls the flow of gas from the patient’s lungs during the exhalation phase of a
breath. This electromechanical subsystem is made up of an exhalation valve, a flow transducer, a
differential pressure transducer, an airway pressure transducer, and three auto zero solenoid valves.
During exhalation, the outflow of gases is regulated by the exhalation valve to achieve the set PEEP.
The exhalation valve is comprised of an electromagnetic linear actuator operating against a mechanical
poppet/seat. The gas flow travels through the flow transducer. The flow transducer is a variable orifice
type and creates a differential pressure proportional to flow. This differential pressure is transmitted to
the differential pressure transducer, which converts the pressure signal to an electrical signal. The
controller uses this signal for flow triggering and to monitor exhaled tidal volume. The airway pressure
transducer reads pressure in the exhalation leg of the patient circuit. This signal is used as a feedback
signal for controlling PEEP, pressure control, pressure support, and various pressure monitors.
Periodically, the auto zero valves activate to reference the differential and airway pressure transducers
to ambient pressure. The offset is recorded by the controller, and is used as an offset for future
pressure measurements. This compensates for long term and temperature drift. Materials exposed to
patient gases include compatible plastics, aluminum, and stainless steel.

L1534 Revision B December 2004

18 Vela Ventilators

Safety System

The mechanical safety system ensures that the patient can breath spontaneously from room air and
that the patient pressure is limited to a maximum preset value in the event of a ventilator malfunction.
This mechanical system consists of a pressure relief valve and a sub ambient relief valve. In the event
of a ventilator malfunction that results in high pressure, the pressure is limited by a relief valve. The
relief valve consists of a user-adjustable, spring-loaded poppet acting against a seat.

In the event the ventilator fails to deliver a breath, the patient may inspire spontaneously by drawing
room air through the sub ambient relief valve.

Materials exposed to patient gas are aluminum, compatible rubber, and compatible plastics.

Inspiratory Hold Valve

The inspiratory hold valve is an electromechanical solenoid valve. If activated, the inspiratory hold
valve blocks flow between the flow delivery system and the patient. This valve is activate during
inspiratory hold and maximum inspiratory pressure maneuvers. Materials exposed to patient gases are
aluminum and compatible rubber and plastic.

Oxygen Blending System

The optional oxygen blending system is made up of an O2 Inlet Transducer, five solenoid valves, five
flow orifices, an inlet filter, and an accumulator. When a breath is initiated, the turbine draws mixed gas
from the accumulator. Filtered air is drawn into the accumulator through the filter. Oxygen is supplied
to the accumulator through the solenoids and orifices. The controller opens and closes the valves as
required to supply the correct amount of oxygen to satisfy the O2 setting and the flow demand. The
signal from the O2 inlet pressure transducer is used to compensated delivered O2 for O2 inlet pressure
variations. Surfaces exposed to patient gas are constructed from compatible plastics, plated steel, and
aluminum.

There is also an optional oxygen inlet port, which allows for low-flow titration of oxygen into the gas
output of this device.

Electronic Overview

The Vela ventilator electronic system is comprised of several subsystems, each containing numerous
components. These subsystems are the GUI System, the Power System, the Main Controller System,
and the Exhalation and Flow Delivery systems. Individual subsystems are discussed in detail.

User interface module (UIM)

The UIM consists of a 10.4-inch, 800x600 active matrix LCD with an analog resistive touch screen
overlay, a back light inverter, a set of membrane key panels, an optical encoder, and a Control PCB.
Software and the touch screen provide a set of context sensitive soft keys. The membrane panel
provides a set of hard (permanent) keys for dedicated functions. Selecting the function with a soft key
and adjusting the setting using the optical encoder changes a parameter. The parameter is accepted or
canceled by pressing the appropriate membrane key.

L1534 Revision B December 2004

Service Manual Theory of Operation 19

(3 & 4)

LCD & TOUCHSCREEN

(1 & 2)

MEMBRANE PANEL WITH

(5)

EMBEDDED LED'S

BACK LIGHT AC VOLTAGE

DIGITAL

TOUCH

SCREEN

BACK LIGHT INVERTER

(6)

CONTROL PCB

(7)

DC-DC

CONVERTERS

24VDC

5V

5V, PRN PORT

3.3V, DIG LOGIC

HIGH SPEED

SERIAL

DIGITAL

UNIVERSAL SERIAL BUS (FUTURE)

PRINTER

RS232

RS232

RS232 (MIB)

(CRT)

Figure 1 -- User Interface Design Module Block Diagram

The UIM performs all ventilator control functions, gas calculations, monitoring and user interface
functions. The UIM uses a Graphical User Interface (GUI) via the active matrix SVGA LCD and resistive
touch screen to provide system and patient information to the user and to allow the user to modify
ventilator settings. The Monitor MCU handles all user interface requirements, including updating the
active matrix liquid crystal display (LCD), monitoring the membrane keypad, analog resistive touch
screen, and optical encoder for activity. The Monitor MCU also performs all the input/output functions of
the UIM, including RS-232, printer, video output, and IEEE 1073 Medical Information Bus (MIB).
Communication between the Control and Monitor MCU’s is accomplished via an 8 bit dual port SRAM.

Liquid Crystal Display

The liquid crystal display (LCD) provides graphical and digital feedback to the clinician. The panel is a

10.4” SVGA, 800x600 pixel, active matrix LCD. The LCD is used to implement the graphical user

interface (GUI). It provides all of the adjustable controls and alarms, as well as displays waveforms,
loops, digital monitors and alarm status in real time.

L1534 Revision B December 2004

20 Vela Ventilators

Touch Screen

The touch screen is a 10.4” analog resistive overlay on a piece of glass, which is placed over an LCD
screen. The touch screen and the LCD together provide a set of software configurable soft keys. The
software enables the keys to be context sensitive. The touch screen has a resolution of 1024x1024.
Physically, the touch screen consists of two opposing transparent resistive layers separated by
insulating spacers. Touching the screen brings the two opposing layers into electrical contact. The Y
coordinate is determined by applying a voltage from top to bottom on the top resistive layer. This
creates a voltage gradient across this layer. The point of contact forms a voltage divider, which is read
by the analog-to-digital converter. The X coordinate is determined by applying a voltage from left to
right on the bottom resistive layer. Again this creates a voltage gradient and the point of contact forms a
divider, which is read with an analog-to-digital converter.

Membrane Panel

The membrane panel provides a set of permanent dedicated keys, which enable control of ventilator
functions. The membrane panel also provides visual display using embedded light emitting diodes
(LEDs). The membrane panel consists of membrane switches, which are read by the monitor CPU. The
switches form a matrix of rows and columns. A key closure causes an interrupt to the monitor CPU,
which responds by scanning the key matrix to determine which key has been pressed.

Light Emitting Diodes (Leds)

Some of the membrane keys require LED’s to indicate when the key is active. The LED’s are
embedded into the membrane panels.

Optical Encoder

The optical encoder allows settings to be modified. The setting is selected by pressing a soft key on the
LCD and then modified by turning the optical encoder (data dial) to change the value. When the
encoder is rotated two pulse streams are generated, phase A and B. When the encoder is turned
clockwise, phase A leads B by 90 degrees. When the direction is counter clockwise, phase B leads A
by 90 degrees. The electronics uses the phase information to drive an up-down counter, which is read
by the monitor CPU. The optical encoder is not interrupt-driven and therefore must be polled by the
monitor CPU.

Back Light Inverter

The back light inverter converts 5 VDC into the high frequency AC voltage necessary to power the LCD
back light, which is used to illuminate the LCD.

Power System

The Power System conditions and controls electrical energy from the AC line input and the internal
battery. When energy is available from the AC line, the ventilator operates from this source, and also
recharges the internal battery. When AC line power is not available, the power system draws energy
from the internal battery. The power system uses energy efficient DC-to-DC converter technology to
convert energy from the AC line or battery to appropriate voltages and currents to supply power to
ventilator components and systems.

Main Controller System

The Main Controller System is comprised of three Pressure Transducers, an Analog-to-Digital
Converter, two Digital-to-Analog Converters, the Input-Output Processor, Solenoid Valves, and the
Watchdog and Hardware Fault Monitors.

L1534 Revision B December 2004

Service Manual Theory of Operation 21

One of the pressure transducers measures the patient circuit pressure. This pressure is an input to the
controller. A differential pressure transducer measures the pressure across the turbine. This pressure is
also an input to the controller. A second differential pressure transducer is used to measure the flow at
the outlet of the exhalation valve. This pressure is also an input to the controller.

Analog to digital converters are used to change the analog pressure signals into measured binary
numeric values for use by the microprocessor in the controller.

Digital to Analog converters are used to change the binary numeric commands generated by the
microprocessor in the controller into analog signals which drive the turbine and exhalation valve.

The Input-Output Processor is a small microcontroller which, under software control, performs several
repetitive tasks such as generating the refresh signals for the display system, cycling the A-to-D
converters through a pattern of measurements from the multiple signal sources, and scanning the
control panel for pressed buttons. Such repetitive tasks are thereby off loaded from the Main Processor.

Solenoid Valves and Valve Drivers (including the Auto Zero valves) are employed on the Circuit
Pressure transducer and on the Turbine Differential Pressure Transducer. These valves allow the
controller software to compensate for long term drift and temperature induced zero shift in the pressure
transducers by periodically rechecking the zero pressure readings. Similar solenoid valves are
employed in the Oxygen Blending System. The valve drivers for the Auto Zero and Blender valves are
similar.

The Main Processor is a 386-type CPU which controls all ventilator functions. All user settings for
alarms, controls, ventilation mode, waveform, and monitoried data are stored here and are combined
with measured pressure, flow, and speed data to cause the ventilator to function. The algorithms,
formulae, and control functions which define ventilator behavior are contained in the software program
executed by the CPU.

The Watchdog Timer and Hardware Fault

Monitors shut down the ventilator if a malfunciton is detected. The Watchdog Timer consists of two
timers and a PAL containing a state machine. The Main Controller CPU must communicate with a state
machine at intervals within a time window set by the two timers. The CPU must obtain a key from the
PAL and send the correct address and data response back to the state machine at each interval. If the
response is incorrect, or comes at an invalid time, the Watchdog shuts down the CPU and forces the
ventilator hardware to a safe state. The Hardware Fault Monitors check the status of the power supplies
to the ventilator electornics. If any is out of the safe operationg range, the ventilator will shut down and
cannot be made to operate until the fault is corrected.

Exhalation System

The electrical portion of the exhalation system is comprised of the Exhalation Valve Driver Circuitry.
The driver converts the low voltage signal output by a D-to-A converter into a controlled constant
current which energizes the linear solenoid positioner in the exhalation valve.

Flow Delivery System

The electrical portion of the flow delivery system is comprised of a 3 Phase Brushless Motor Driver, and
an Optical Speed Transducer.

The 3 Phase Brushless DC Motor Driver converts the low voltage signal output by a D-to-A converter
into three controlled currents which energize the three motor phases and cause the motor to create a
torque, resulting in motor rotation. The torque generated is a function of current, and therefore of the
control voltage from the D-to-A converter. The speed of rotation is monitored by the optical Speed
Transducer. The transducer outputs a train of pulses with a frequency proportional to the rotational
speed of the motor. This pulse train is a control feedback input to the controller.

L1534 Revision B December 2004

22 Vela Ventilators

Oxygen Blending System

The electrical portion of the optional oxygen blending system is made up of a safety solenoid, a
pressure regulator set to 40 PSI, an O2 Inlet Transducer, five Solenoid Valves, one Nebulizer solenoid,
and the driver circuitry for the solenoid valves.

The Oxygen Inlet Pressure Transducer measures the incoming gas pressure so that O2 delivery can be
compensated for inlet pressure fluctuations.

The Solenoid Valves are energized and deenergized under software control by the Main controller to
supply the correct amount of oxygen to satisfy the current O2 setting and current gas flow demand.

The driver circuitry translates the binary logic signals presented by the controller to larger voltage and
currents suitable for energizing the Solenoid Valves.

L1534 Revision B December 2004

Chapter 3 Disassembly & Assembly

General Instructions and Warnings

When performing the procedures in this chapter, refer to the Vela wiring and tubing diagrams.
Reference copies of these are located in Appendix B of this manual. Ensure that you follow these safety
warnings and precautions:

Figure 3.1 Battery Disconnect Molex Connector

WARNING

Always disconnect the main power cable before removing the instrument cover and disconnect the
battery once the top cover and battery tray have been removed to prevent injury and/or damage to the
VELA Ventilator System (see figure 3.1).

CAUTION

The Vela contains ESD susceptible components. Ensure you are properly grounded before performing
any service or maintenance procedures and store ESD susceptible electrical components in an anti­static bag to prevent damage to the component.

Note

When the batteries are disconnected, the system will automatically re-set the battery status memory and will
initiate an 18-hour re-charge cycle upon re-connect. During this period, the red DC status light will remain on.
If the DC status light remains lit after the initial charging period has expired, contact VIASYS tech support as
described in Appendix A for a replacement battery.

Note

Do not cut the main harness tie wraps since the entire harness is regarded as one component.

Note

The terms left and right refer to a view from the front of the unit looking towards the rear.

L1534 Revision B December 2004

24 Vela Ventilators

Required Tools

Long & short Philips screwdrivers

Flat bladed screwdriver

¼” Nut Dirver

5/16” Nut Driver

7/8” Nut Driver

11/32” Nut Driver

Digital Volt Meter

Tack puller or Needle nosed pliers

Diagonal cutters

1” and ¾” open ended wrenches

Disassembly and Reassembly Procedures

To perform a complete disassembly of the unit, follow all of the steps in each removal section, in the
order presented in this chapter. To reassemble the unit, follow all of the steps in each installation
section, starting with the last component and finishing with the power cable installation instructions.

Power Cable

Figure 3.2 Power Cable Connector with Guard

Removal

1. Remove the (2)Phillips pan-head screws in the top portion of the power cable guard at the rear of
the unit (see figure 3.2)

2. Remove the guard and unplug the power cable.

Installation

1. Plug the power cable into the rear of the unit.

2. Install the power cable guard with the (2) Phillips pan-head screws in the top portion.

L1534 Revision B December 2004

Service Manual Disassembly & Reassembly Procedures 25

Top Cover Part number 15893

Removal

1. Remove the power cable.

2. Remove the (3) Phillips pan-head screws in the upper rear of the front panel (if present).

3. Remove the (4) Phillips pan-head screws in the back panel.

4. Remove the (3) screws from the bottom of each side of the ventilator (if present).

Note

The configuration of the screws securing the cover will depend on the model of Vela that you are working with.

5. When all screws have been removed, slide the top cover towards the rear of the unit and lift off.

CAUTION

The SVGA output ribbon cable lies directly beneath the top cover assembly running from the front of the Vela to
the rear. It can be damaged if care is not taken when removing the cover. Make sure that the cover clears this
cable before sliding it back.

Installation

1. Install the top cover by sliding it toward the front of the unit, over the side rails, and snap into place.

2. Install the (4) Phillips pan-head screws in the back panel.

3. Do not re-install the (3) Phillips pan-head screws in the upper rear of the front panel if present.

They have been removed from later versions of the Vela.

4. Install the power cable.

Cover mounting screws
on rear of instrument

Figure 3.3 Cover Assembly from the rear

L1534 Revision B December 2004

26 Vela Ventilators

Battery Tray Part Number 10633

Removal

1. Remove the power cable and top cover.

2. Remove the (4) Phillips pan-head screws in the battery tray.

3. Lift the battery tray out of the unit.

4. Disconnect the batteries from the white Molex DC power connector (see figure 3.4

Figure 3.4 Large white Molex battery disconnect

To release connector, push in locking tabs

To attach push until locking tabs engage.

Tab

Note

When the batteries are disconnected, the system will automatically re-set the battery status memory and will
initiate an 18-hour re-charge cycle upon re-connect. During this period, the red DC status light will remain on.
If the DC status light remains lit after the initial charging period has expired, contact VIASYS tech support as
described in Appendix A for a replacement battery.

Installation

1. Connect the white Molex DC power connector.

2. Ensure the Molex connector is pushed down into the unit behind the muffler tubes and install the
battery tray. The tray is correctly installed when the wires run towards the rear of the unit.

3. Secure the battery tray to the left & right panels with (4) Phillips pan-head screws.

4. Install the top cover and re-connect the power cable and the power cable guard.

Battery Tray Parts List

Item Part number Description Qty UM

1 21363 Tray, battery 1 Ea
2 52000-00190 Grommet 11/16 id 0 Ea
3 21543 Battery 12v, 2.7 Ahr, ni-mh 4 Ea
4 15719 Cable assy, battery tray 1 Ea
5 20742 Bracket, capacitor 2 Ea
6 21068 Foam pad, capacitor bracket 2 Ea
7 64084 Capacitor elect 0.1f 63vdc 1 Ea
8 04383 Washer, lock int #6 4 Ea

9 07212 Nut, 6-32 x .093 depth 8 Ea
10 05038 Tie, strap 4 Ea
11 08231 Mounting bracket, cable tie 2 Ea
12 07803 Cable tie 2 Ea
14 09349x Tape, adh-2s,2" x .045" 0 Ft

L1534 Revision B December 2004

Service Manual Disassembly & Reassembly Procedures 27

Figure 3.5 Battery Tray and large capacitor assembly

L1534 Revision B December 2004

28 Vela Ventilators

PCMCIA Cards

The PCMCIA card is located inside the unit. It contains the Vela software.

Card release
button

Figure 3.6 PCMCIA Card in place

Removal

1. Remove the power cable, top cover, and battery tray.

2. Push in the button under the card to release. (see figure 3.6)

3. Gently slide the card out of its socket.

Installation

1. Slide the card into the socket in the direction of the arrow printed on the card.

2. Click card into place.

3. Install the battery tray, top cover, and power cable.

Left Panel

The left panel is structural only and has no components attached to it.

Removal

1. Remove the power cable, top cover, and battery tray.

2. Remove the (2) Phillips countersink screws at the rear of the panel.

3. Remove the (1) Phillips countersink screw in the upper front of the panel.

4. Lift out the left panel.

Installation

1. Slide the front of the left panel behind the lip on the front panel and align the back of the panel with
the rear panel edge.

2. Install the (2) Phillips countersink screws in the rear of the right panel.

3. Install the (1) Phillips countersink screw in the upper front of the right panel.

4. Install the battery tray, top cover, and power cable.

L1534 Revision B December 2004

Service Manual Disassembly & Reassembly Procedures 29

Right Panel Containing the Power PCB P/N 15894

Note

The internal battery fuse is located on the power PCB. Call Viasys if this fuse needs replacing.

Removal

1. Remove the power cable, top cover, and battery tray.

2. Remove the (2) Phillips countersink screws from the right side of the rear panel.

3. Remove the (1) Phillips countersink screw in the upper front of the right panel.

4. Remove the (1) Phillips pan-head screw in the lower center of the right panel.

5. Gently lift out the panel and the power PCB. Lay the panel flat and make the following

disconnections:

Ref on Pwr

PCB

J1 26-pin ribbon cable to J2 on main PCB P/N 15494
J2 3-pin to fan assembly
J5 14-pin to J5 on main PCB (in main harness)
J6 10-pin to P2 on turbine motor driver PCB
J7 small 2-pin to main power switch
J300 large 2-pin to battery DC power (in main harness)
J400 4-pin quick disconnect to SVGA PCB
P1-L/N AC line in to power (black-power, white-neutral) P/N 15890
to ground lug (ground)

Connector Desc Connection made

Cable Assy

P/Number

Note

Do NOT remove the connector from J4 of the power PCB.

Installation

Make the following connections to the Power PCB.

Ref on Pwr

PCB

J1 26-pin ribbon cable from J2 on main PCB P/N 15494
J2 3-pin from fan assembly
J5 14-pin from J5 on main PCB (in main harness)
J6 10-pin from P2 on turbine motor driver PCB
J7 small 2-pin from main power switch
J300 large 2-pin from battery DC power (in main harness)
J400 4-pin quick disconnect from SVGA PCB
P1-L/N AC line in to power (black-power, white-neutral) P/N 15890
from ground lug (ground)

Connector Desc Connection made

WARNING

Ensure that the power cables are correctly connected to prevent injury and/or damage to the unit.

Cable Assy

P/Number

L1534 Revision B December 2004

30 Vela Ventilators

CAUTION

Ensure that J5 is pinned properly since an incorrect connection could damage the power PCB.

6. Slide the right panel into the front panel, ensuring that it rests on the bottom rail.

7. Install the (1) Phillips pan-head screw in the lower center of the panel.

8. Install the (1) Phillips countersink screw in the upper front of the panel.

9. Install the (2) Phillips countersink screws in the side of the rear panel.

10. Install the battery tray, top cover, and power cable.

Note

The Vela right panel assembly with the power board attached is supplied as a single complete assembly part
number 15894. Do not attempt to disassemble or to replace individual components.

L1534 Revision B December 2004

Service Manual Disassembly & Reassembly Procedures 31

Figure 3.7 Right Panel and Power PCB

L1534 Revision B December 2004

32 Vela Ventilators

Front Panel Part number 15869

Removal

1. Remove the power cable, top cover, battery tray, right panel, and left panel.

2. Disconnect the following from the main PCB:
JP2 40-pin ribbon cable to JP1 on the SVGA out PCB
J301 12-pin to J301 on the blender PCB P/N 15497

Note

Disconnect the video cable from JP2 on the main PCB rather than from JP1 on the SVGA out PCB.

3. Disconnect the green oxygen nebulizer tube.

4. Remove the (2) Phillips pan-head screws behind the front panel at the lower left and right.

5. Disconnect the 1/8” silicone tube #4 from P2 and #5 from P1 on the exhalation differential
transducer, and #1 from the turbine.

6. Disconnect the 1/16” silicone tubes from the common (front) ports of the turbine outlet auto-zero
solenoid (to the main tubing harness), the turbine inlet auto-zero solenoid (to the turbine), and the
airway pressure auto-zero solenoid (Nafian tube to the exhalation valve receptacle).

7. Disconnect the following from the main PCB:
J4 8-pin to J1 on the FIO2 monitoring PCB
J900 2-pin (alarm loudness) to alarm potentiometer
J701 5-pin to turbine optic encoder and thermistor
J401 4-pin to exhalation valve
U719 fiberoptic to rear panel connector
J5 14-pin to J5 on power PCB
J302 2-pin to inspiratory hold solenoid on manifold base
J2 26-pin to J1 on power PCB P/N 15494
J905 3-pin to J2 on remote alarm (nurse call) PCB
AL901 (hard-wired) 2-prong to alarm cable connector

Installation

1. Connect the green oxygen nebulizer tube.

2. Connect the following to the main PCB:
J401 4-pin from exhalation valve
J701 5-pin from turbine optic encoder and thermistor
U719 fiberoptic from rear panel connector
J5 14-pin from J5 on power PCB
J2 26-pin from J1 on power PCB P/N 15494
J905 3-pin from J2 on remote alarm (nurse call) PCB

3. Slide the front panel into place and secure the (2) Phillips panhead screws behind the front panel
at the lower left and right.

4. Connect the following to the main PCB:
J302 2-pin from inspiratory hold solenoid on manifold base
J4 8-pin from J1 on the FIO2 monitoring PCB
J301 12-pin from J301 on the blender PCB P/N 15497
AL901 (hard-wired) 2-prong from alarm cable connector
J900 2-pin alarm loudness cable from alarm potentiometer

L1534 Revision B December 2004

Service Manual Disassembly & Reassembly Procedures 33

5. Connect the 1/16” silicone tubes to the common (front) ports of the turbine outlet auto-zero

solenoid (from the main tubing harness), the turbine inlet auto-zero solenoid (from the turbine), and
the airway pressure auto-zero solenoid (Nafian tube from the exhalation valve receptacle).

6. Connect the 1/8” silicone tube #4 to P2 and #5 to P1 on the exhalation differential transducer, and

#1 to the turbine.

7. Connect the following to the main PCB:

JP2 40-pin ribbon cable from JP1 on the SVGA out PCB

Note

Ensure that the fiber optic cable runs under the turbine muffler, that the tubing runs over the nebulizer line and is not
pinched in between the front and base panels, and that the cable from J701 is securely connected to the turbine.

Parts List – Front Panel Part Number 15869

Item Part Number Part Description Qty U/M

1 21374 PANEL, FRONT 1 EA

2 52130 PCBA, MAIN 1 EA

3 53002-16206 SCREW, 6-32 X 3/8 STL ZN PLT PPH PNH 12 EA*

4 52000 PCBA, VELA VIDEO (SVGA PCB) 1 EA

5 15532 IC, PAL, PROGRAMMED 1 EA

6 15868 DISPLAY MODULE ASSY 1 EA

11 21368 BEZEL, DISPLAY 1 EA

12 80435 SWITCH, MEMBRANE 1 EA

15 44027 NUT, 4-40,LOCKING, HEX, STEEL 2 EA*

16 71046 NUT, 1/4-28, E-KEPS 1 EA*

21 66100 TOUCHSCREEN, 10.4" RESISTIVE" 1 EA

23 52000-01177 TAPE FOAM .025 THK .31 WIDE TWO SIDED 0 RL*

25 56060-30011 OPTICAL ENCODER 1 EA

26 52000-00475 NUT HEX 1 EA*

27 53027-13802 WASHER, LOCK 3/8 1 EA*

28 20415 CONN, FTG 1/8 TUBE TAPER 1 EA

29 15991 CONN ASSY, FLOW SENSOR BHD, VELA 1 EA

30 15961 CABLE ASSY, FLOW SENSOR - MAIN BOARD 1 EA

31 15962 CABLE ASSY, VIDEO BOARD TO POWER 1 EA

32 15963 CABLE ASSY, VIDEO BOARD TO MAIN BOARD 1 EA

33 21560 KNOB, SPINNER-1.50 1 EA

34 53002-46204 SCR 6-32X1/4 SS PPH PNH 4 EA*

35 10632 TUBING ASSY, 1/8 X 1/16 3 EA

* Commonly found hardware items are not supplied by VIASYS Healthcare.

L1534 Revision B December 2004

34 Vela Ventilators

Figure 3.8 Front panel with main PCB

Main PCB (on Front Panel) P/N 52130

Removal

1. Remove the power cable, top cover, battery tray, right panel, left panel, and front panel.

2. Disconnect the following from the main PCB:
J801 20-pin to J801 on the flow sensor PCB (in harness)
J1210 5-pin (gray top, green) to the flow sensor PCB (in P/N 15961 harness)
J3 10-pin to the flow sensor PCB (in P/N 15961 harness)
J1211 5-pin (blue wire-top) to the SVGA PCB
J1 5-pin (orange wire) to SVGA PCB (position wire on 2
J1 5-pin (gray-left) to SVGA PCB
J601 5-pin to SVGA PCB

3. Loosen (7) Phillips pan-head screws on the main PCB.

4. Lift the main PCB out of the front panel.

Installation

1. Position the main PCB onto the standoffs in the front panel.

2. Tighten (7) Phillips pan-head screws on the main PCB.

nd

pin from right)

L1534 Revision B December 2004

Service Manual Disassembly & Reassembly Procedures 35

3. Connect the following to the main PCB:

J801 20-pin from J801 on the flow sensor PCB (in harness)
J1210 5-pin (gray top, green) from the flow sensor PCB (in P/N 15961 harness)
J3 10-pin from the flow sensor PCB (in P/N 15961 harness)
J1211 5-pin (blue wire-top) from the SVGA PCB
J1 5-pin (orange wire) from SVGA PCB (position wire on 2

nd

pin from right)
J1 5-pin (gray-left) from SVGA PCB
J601 5-pin from SVGA PCB

Note

The J1 position on the main PCB is located above the J601 connector and accepts two 5-pin connectors; the
connector with one wire above the connector with three wires.

4. Install the front panel, left panel, right panel, battery tray, top cover, and power cable.

L1534 Revision B December 2004

36 Vela Ventilators

Figure 3.9 Front Panel wiring diagram

L1534 Revision B December 2004

Service Manual Disassembly & Reassembly Procedures 37

Flow Sensor PCB assembly P/N 15991

Figure 3.10 Flow Sensor PCB assembly

Removal

1. Remove the power cable, top cover, battery tray, right panel, left panel, front panel, and main PCB.

2. Disconnect the (2) 1/16” ID tubes to the main tubing harness.

3. Disconnect the following from the flow sensor PCB:
J1 6-pin (grey) to main PCB P/N 15961

4. Remove the (2) 1/4” nuts on the flow sensor PCB.

5. Lift off the flow sensor PCB.

Installation

1. Position the flow sensor PCB onto the two standoffs.

2. Install the (2) 1/4” nuts on the flow sensor PCB.

3. Connect the following to the flow sensor PCB:
J1 6-pin (grey) from the main PCB P/N 15961

4. Connect the (2) 1/16” ID tubes from the main tubing harness, #2 and #3 (with a black line on it).

5. Install the main PCB, front panel, left panel, right panel, battery tray, top cover, and power cable.

L1534 Revision B December 2004

38 Vela Ventilators

Exhalation Valve Assembly P/N 15871

Dryer tube

Figure 3.11 Exhalation Valve Assembly

Removal

1. Remove the power cable, top cover, battery tray, right panel, left panel, and front panel.

2. Disconnect the following from the FIO2 monitoring PCB:
J2 2-pin (clear conn.) to oxygen sensor
J3 2-pin (blue conn.) to oxygen inlet solenoid on blender assembly
J4 2-pin (red conn.) to nebulizer solenoid assembly on upper rear of blender

3. Remove (2 Phillips pan-head screws on the valve cover.

4. Lift out the exhalation valve assembly.

Installation

1. Ensure the dryer tube is securely attached to the nipple on the exhalation valve assembly.

2. Seat the valve onto the standoffs, with the PCB towards the inside of the unit.

3. Install the valve cover using (2) Phillips panhead screws.

4. Connect the following to the FIO2 monitoring PCB:
J2 2-pin (clear conn.) from oxygen sensor
J3 2-pin (blue conn.) from oxygen inlet solenoid on blender assembly
J4 2-pin (red conn.) from nebulizer solenoid assembly on upper rear of blender

5. Install the front panel, left panel, right panel, battery tray, top cover, and power cable.

L1534 Revision B December 2004

Service Manual Disassembly & Reassembly Procedures 39

Inspiratory Hold Solenoid and Check Valve Assembly P/N 11382

Removal

1. Remove the power cable, top cover, battery tray, and

left panel.

2. If the front panel is installed, disconnect the cable from

J302 on the main PCB.

3. Remove (2) Phillips pan-head screws and lift out the

solenoid.

4. Lift out the spring and check valve assembly.

Figure 3.12 Inspiratory Hold Solenoid

Installation

Figure 3.13 Umbrella check valve (P/N 21950)

1. Place the spring (P/N 21971) into the center of the check valve (P/N 21950).

2. Slip the solenoid over the spring using the guide and seat into place.

3. Install (2) Phillips pan-head screws.

4. If the front panel is installed, connect the cable from J302 on the main PCB.

5. Install the left panel, battery tray, top cover, and power cable.

L1534 Revision B December 2004

40 Vela Ventilators

Manifold Base assembly

Replace three o-rings

Figure 3.14 Manifold base assembly (early model Vela units only),

Nut securing O2
sensorl

bottom panel & O2 hose removed

O2 sensor placed
horizontally for easy
access from rear of
ventilator

Figure 3.15 Manifold Base assembly showing horizontal O2 cell for easy removal.

L1534 Revision B December 2004

Service Manual Disassembly & Reassembly Procedures 41

Removal

1. Remove the power cable, top cover, and

battery tray.

2. Carefully turn the unit onto its side.

3. Remove (2) Phillips countersink screws that

hold the safety check valve guard, and remove
the guard.

4. Remove (4) rubber feet.

5. If the left panel is installed, remove (3) Phillips

pan-head screws on the left side of the bottom
panel, and if the front panel is installed,
remove (2) Phillips pan-head screws at the
front of the bottom panel.

Figure 3.15 Removal of safety check valve guard

6. Remove (7) Phillips pan-head screws on the outside of the bottom panel.

7. Gently remove the bottom panel.

8. Remove the three visible o-rings from the underside of the unit, part number 30018, 30023 and

04358see figure 3.X.

9. Pull off the oxygen diffuser tube from the nipple and remove it from the channel base, see figure

3.15

Figure 3.16 Removing the O2 diffuser tube

Installation

1. Carefully turn the unit upside down.

2. Attach the curved portion of the oxygen diffuser tube to the nipple and push into place. Place the

remaining portion of the tube inside the channel base in the underside of the unit.

3. Insert the three o-rings- into the underside of the unit, noting that each o-ring has a different shape.

4. Ensure that all three o-rings are in place and position the bottom panel over the three screw holes

at the front.

L1534 Revision B December 2004

42 Vela Ventilators

5. Install (7) Phillips panhead screws on the bottom panel.

6. If the left panel is installed, install (3) Phillips pan-head screws on the left side of the bottom panel,
and if the front panel is installed, install (2) Phillips pan-head screws at the front of the bottom
panel.

7. Install (4) rubber feet.

8. Install the safety check valve guard with (2) Phillips countersink screws.

9. With the unit upright, install the battery tray, top cover, and power cable.

L1534 Revision B December 2004

Service Manual Disassembly & Reassembly Procedures 43

Oxygen Sensor part number 15972

For early model Vela units do the following:

Removal

1. Remove the power cable, top cover, battery tray, left panel, and bottom panel.

2. Turn the unit on its side.

3. Remove the 1” mounting nut from the manifold base (see figure 3.14) and pull the sensor from the

manifold.

Note

To remove the O2 sensor only when complete disassembly is not required, simply grasp the sensor in
place and unscrew from the retaining nut leaving the nut in place in the base.

Installation

1. Ensure the o-ring is installed into the oxygen senor.

2. With the unit on its side, place the sensor into the manifold and install the 1” mounting nut.

3. Install the bottom panel, left panel, battery tray, top cover, and power cable.

For later model Vela units (usually 1400 series or later) do the following:

Removal

On the bottom rear of the Vela, unscrew the EMI shield containing the foam ambient air filter and lift out
the shield and filter together.

The O2 sensor is visible on the left . Using needle nose pliers, disconnect the O2 filter connector. Pull
firmly straight back on the O2 sensor to remove.

Installation

Seat the new O2 filter and re-connect.

Replace the EMI shield containing the foam ambient air filter and re-attach the screws securing it in
place.

L1534 Revision B December 2004

44 Vela Ventilators

Rear Panel part number 15892

Removal

1. Remove the power cable, top cover, battery tray, right panel, and left panel.

2. With the unit upright, disconnect the following from the turbine motor driver PCB:

P2 10-pin to main PCB and power PCB via main harness

3. Cut the two tie wraps that hold the main harness and the tie wrap that holds the blender cable to
the turbine.

4. Turn the unit on its side.

5. Remove (3) Phillips pan-head screws on the rear panel.

6. Slide the fiber optic cable from under the turbine muffler assembly.

7. Remove the rear panel from the manifold base.

Installation

1. Carefully place the unit on its side and run the fiber optic cable under the muffler tubes.

2. Direct the blender nipple on the rear panel through the hole in the manifold base.

3. Install (3) Phillips pan-head screws on the rear panel, ensuring that the blender nipple is centered.

4. With the unit upright, install the blender cable tie wrap to the turbine, and install the two tie wraps
that hold the main harness onto the tie mounts, noting that the tie wraps are positioned where the
wires all run parallel.

5. Connect the following to the turbine motor driver PCB:

P2 10-pin from main PCB and power PCB via main harness

6. Install the left panel, right panel, battery tray, top cover, and power cable.

L1534 Revision B December 2004

Service Manual Disassembly & Reassembly Procedures 45

L1534 Revision B December 2004

46 Vela Ventilators

Figure 3.17 Rear Panel views

L1534 Revision B December 2004

Service Manual Disassembly & Reassembly Procedures 47

Turbine and Muffler Assembly

Removal

1. Remove the power cable,
top cover, battery tray, right
panel, left panel, and
blender.

2. If the front panel is installed,
disconnect the cable from
J701 on the main PCB,
disconnect the green
oxygen nebulizer tube, and
disconnect the blender
cable.

3. If installed, use a 3/4"
wrench to remove the high
and low pressure oxygen
fittings from the rear of the
unit, noting that the high
pressure fitting is located
above the low pressure
fitting (see figure 3.18).

Figure 3.18 Turbine & Muffler assembly

4. Remove (5) Phillips pan-head screws.

5. Disconnect the gray silicone intake and output
elbows by gently pulling them out from the muffler
tubes.

6. Lift the assembly off the manifold base.

7. Gently pull up the elbows to remove.

Installation

1. Insert the elbows into the manifold base.

2. Set the turbine and muffler assembly onto the
manifold.

3. Install (5) Phillips pan-head screws.

Figure 3.19 High & low pressure
O2 fittings on back panel

4. If removed during this procedure, use a 3/4" wrench to install the high and low pressure oxygen
fittings to the rear of the unit, noting that the high pressure fitting is located above the low pressure
fitting.

5. Connect the gray silicone intake and output elbows by inserting them into the muffler tubes. Push
once in the center of each elbow to properly seat.

6. If the front panel is installed, connect the cable to J701 on the main PCB, connect the green
oxygen nebulizer tube, and connect the blender cable.

7. Install the blender, left panel, right panel, battery tray, top cover, and power cable.

L1534 Revision B December 2004

48 Vela Ventilators

Over Pressure Relief Valve assembly

Figure 3.20 Over Pressure Relief Valve assembly with o-ring

Removal

1. Remove the power cable, top cover, battery tray, right panel, left panel, and front panel.

2. Use a flat screwdriver to pry the valve from its location at the front left side of the manifold base.

3. Remove the o-ring (P/N 08963).

4. Using a flat screwdriver in the middle slot, unscrew the adjuster in the middle of the valve and
remove the two o-rings (P/N 30005 in the relief valve poppet and P/N 30017 on the brass adjuster).

Installation

1. Install the two o-rings (P/N 30005 in the relief valve poppet and P/N 30017 on the brass adjuster).

2. Slide the housing over the poppet and screw clockwise into the housing, tightening with a flat
screwdriver.

3. Slide the valve into place in the manifold base, ensuring that the adjustment screw is in the notch.

CAUTION

Do not adjust the screw in the relief valve, since it must be factory calibrated.

4. Push until the valve is seated into place.

5. Install the front panel, left panel, right panel, battery tray, top cover, and power cable.

L1534 Revision B December 2004

Service Manual Disassembly & Reassembly Procedures 49

Turbine Motor Driver PCB part number 71597

Removal

1. Remove the power cable, top cover, battery tray, right panel.

2. Disconnect the following from the turbine motor driver PCB:

P1 8-pin to the turbine
P2 10-pin to J6 on the power PCB

3. Remove the (2) keps screws.

4. Lift off the PCB.

Note

Do not remove the turbine from the turbine muffler assembly. They are supplied complete.

Installation

1. Position the turbine motor driver PCB on the right side of the turbine assembly, on top of the filter

holder, with the board toward the turbine.

2. Install (2) keps screws.

3. Connect the following to the turbine motor driver PCB:

P1 8-pin from the turbine
P2 10-pin from J6 on the power PCB

4. Install the right panel, battery tray, top cover, and power cable.

L1534 Revision B December 2004

50 Vela Ventilators

Muffler/Filter Assemblies part number 10364

Removal

1. Remove the power cable, top cover,
battery tray, and left panel.

2. Remove (6) Phillips pan-head screws on
the filter cover.

Figure 3.21

3. Remove the cover and the two o-rings (P/N

30020).

O-rings P/N 30020

Figure 3.22

4. Use needle-nosed pliers to pull out both the left
and right filter assemblies. The right assembly
has the filter sock

Figure 3.24

Figure 3.23

Installation

1. Insert the muffler (output) into the left tube (see
picture) and the sock filter (input) into the right tube.
The right and left muffler/filter assemblies are sold
together as part number 10365.

2. Install two o-rings (P/N 30020).

3. Install the cover using (6) Phillips pan-head
screws.

4. Install the left panel, battery tray, top cover, and
power cable.

L1534 Revision B December 2004

Service Manual Disassembly & Reassembly Procedures 51

Blender Assembly Part Number 15895

Removal

1. Remove the power cable, top cover, battery tray, and right panel.

2. If the rear panel is installed, remove the high and low pressure oxygen fittings from the rear panel

using a 3/4" wrench, noting that the high pressure fitting is located above the low pressure fitting.

3. If the rear panel is installed, disconnect the 40-pin ribbon cable from the SVGA out PCB.

4. If the front panel is installed, disconnect the green oxygen nebulizer tube.

5. Disconnect the following from the blender PCB:

J301, 12-pin connector to J301 on the main
PCB

6. Remove the bottom strip ambient air inlet filter

by pinching and pulling it out.

Figure 3.25 Ambient air filter

7. Remove (3) Phillips pan-head screws on the right side of the rear panel.

8. Use needle-nosed pliers to disconnect the oxygen diffuser tube as you remove the blender

assembly.

9. If the exhalation valve assembly is installed, disconnect the following from the FIO2 PCB:

J3 2-pin (blue conn.) to oxygen inlet solenoid on blender assembly
J4 2-pin (red conn.) to nebulizer solenoid assembly on upper rear of blender

Installation

1. If the exhalation valve assembly is installed, connect the following to the FIO2 PCB:

J3 2-pin (blue conn.) from oxygen inlet solenoid on blender assembly
J4 2-pin (red conn.) from nebulizer solenoid assembly on upper rear of blender

2. Position the blender assembly inside the unit.

3. Use needle-nosed pliers to feed the oxygen diffuser tube through the hole in the rear panel and

connect it to the blender nipple.

4. Install (3) Phillips pan-head screws on the right side of the rear panel.

5. Install the bottom strip ambient air inlet filter.

6. Connect the following to the blender PCB:

301 12-pin from J301 on the main PCB

7. If the front panel is installed, connect the green oxygen nebulizer tube.

8. If the rear panel is installed, connect the 40-pin ribbon cable to the SVGA out PCB.

9. If the rear panel is installed, install the high and low pressure oxygen fittings to the rear panel using

a 3/4" wrench, noting that the high pressure fitting is located above the low pressure fitting.

10. Install the right panel, battery tray, top cover, and power cable.

L1534 Revision B December 2004

52 Vela Ventilators

Figure 3.26 Blender Assembly

L1534 Revision B December 2004

Service Manual Disassembly & Reassembly Procedures 53

Fan Assembly part number 15500

Fan

EMI Shield Filter holder Filter Filter Grid

Figure 3.27 Fan Assembly blow out

Removal

1. Remove the power cable, top cover, and battery tray.

2. Use a 5/16” nut driver to remove the inside nuts and a short (#2) Phillips screwdriver to remove the

(4) Phillips pan-head outside screws on the fan assembly.

3. Remove the fan and ESD shield from the inside of the unit, and the filter grid from the rear of the

unit.

4. Disconnect the fan cable from J2 on the power PCB.

Installation

1. Place the fan filter inside the external fan cover. Align with 4 attachment holes, and hold it against

the rear panel.

2. Hold the ESD shield to the inside of the rear panel with the copper contact strips touching the rear

panel.

3. Place the fan onto the ESD shield with the label to the inside of the unit and the wire at the bottom.

4. Use a 5/16” nut driver to install the nuts from the inside and a short (#2) Phillips screwdriver to

install the (4) Phillips pan-head machine screws onto the fan assembly from the outside.

5. Connect the fan cable to J2 on the power PCB.

6. Install the battery tray, top cover, and power cable.

L1534 Revision B December 2004

54 Vela Ventilators

L1534 Revision B December 2004

Chapter 4 Operational Verification and

Calibration

Operational Verification Testing

Prior to using the Vela ventilator on a new patient the following checks should be carried out to ensure
optimum performance. Verification testing should always be performed “off patient”.

WARNING

Disconnect patient from the ventilator before performing verification testing.

Note

All personnel performing preventive maintenance and product repair must be trained and certified by VIASYS
Healthcare to service the product

Note

If any portion of the following performance check fails, and you are unable to correct the problem, contact your
VIASYS Healthcare Certified Service Technician.

First perform the User Verification Tests (UVTs). To access the UVTs, do the following’

1. After disconnecting the patient, turn the ventilator OFF (i.e., STANDBY).

2. Press and hold the Accept button.

3. While holding the Accept button, turn the ventilator ON. Continue to hold the button until the

ventilator completes the Power On Self Tests (POST).

4. Release the Accept button when the UVT menu appears in the screen. The Audible Alarm

sounds. Press Alarm Reset button to clear.

Figure 4.1 UVT Startup Screen

5. Press the Patient Removed touch screen icon, the UVT test selection screen displays (see

figure 4.2).

L1534 Revision B December 2004

56 Vela Ventilators

6. Press the appropriate touch screen icon to begin a test.

Lamp Test

Run this test to check the front lamps to make sure they are functioning properly.

1. Press the LampTest touch screen icon to start the test. The ventilator illuminates all front panel
LEDs.

2. Press the LampTest touch screen icon again to turn the LEDs off and exit the test.

Switch Test

Run this test to check the front panel membrane switches to make sure they are working properly.

1. Press the SWITCH TEST icon.

2. Press each membrane switch control in turn. Watch for the name of the control to appear in the
message bar at the bottom left of the touch screen as follows:

Figure 4 2 The UVT Screen with the Main screen in Service mode

L1534 Revision B December 2004

Service Manual Chapter 4 Operational Testing and Calibration 57

3. Press the SWITCH TEST icon again to exit the test.

Alarm Test

Run this test to check the audible alarm.

1. Press the Alarm Test touch screen icon to start the test. The audible alarm sounds.

2. Press the Alarm Test touch screen icon again to silence the audible alarm and exit the test.

Filter Test

Run this test to check the differential pressure across the turbine inlet filter. A high differential pressure
may indicate a dirty or occluded filter.

1. Press the Filter Test touch screen icon. The turbine accelerates flow to 140 lpm and checks the

where x.x is the average turbine differential pressure and P indicates the test passed.

If the test fails, the following message appears:

differential pressure to make sure it is within range. At the end of the test, the ventilator displays
a pass or fail message. If the test passes, the following message appears:

x.x Passed

x.x Failed

where x.x is the average turbine differential pressure and F indicates the test failed:

L1534 Revision B December 2004

58 Vela Ventilators

2. If the test fails, check the rotation of the turbine inlet filter to make sure that the seam is

horizontally oriented and run the test again. If the test fails again, contact a Bird Certified Service
Technician.

Leak Test

Note

This test should be performed with all circuit accessories installed (e.g., humidifier, water traps, and so on.)
Make sure al connections are secure and all openings occluded before beginning the test.

Run this test to make sure the patient breathing circuit is not leaking.

1. Attach a one-liter test lung (P/N 33754) at the patient breathing circuit wye.

2. Press the Leak Test touch screen icon to run the test. The test begins by increasing the

pressure in the patient breathing circuit to 60 cmH2O. The ventilator then displays the following
messages in sequence:

Leak test requested
Leak test in progress

3. The ventilator then waits 10 seconds and measures the circuit pressure again. If the difference

between the starting and ending measurements is less than or equal to 6 cmH2O, the test
passes and the ventilator displays the following message:

Exit

xx.x Passed

where xx.x is the ending measurement.

4. Otherwise, if the difference is more than 6 cmH2O, the test fails and the ventilator displays the
following message:

xx.x Failed

5. If the test fails, check all connections to make sure there are no leaks and repeat the test.

6. It the test fails again, refer to Chapter 5, for troubleshooting procedures

To exit the UVTs press the EXIT touch screen icon.

L1534 Revision B December 2004

Service Manual Chapter 4 Operational Testing and Calibration 59

Extended Functions

The Extended Functions menu may be accessed via the UVT Test Select screen as described in the
previous section. Press the EXTENDED FUNCTIONS icon from the UVT screen.

Figure 4.3 Accessing the Extended Functions Screen from the UVT menu

You can also access the extended functions screen via the Screens menu during normal operation.

Press the screen display area on the top center of the touch screen to activate Screen Select menu.

Figure 4.4 Accessing the Extended Functions screen from the Screen Select menu

Press the EXTENDED FUNCTIONS touch screen icon to display the Extended Functions screen.

L1534 Revision B December 2004

60 Vela Ventilators

Figure 4.1 Extended Functions screen menu

Events

To access the Events list, press the Events screen icon

Figure 4.2 Press the Events touch screen icon

A list of chronological events displays with the latest event at the top as shown in figure 4.11

Figure 4.3 The Events screen

L1534 Revision B December 2004

Service Manual Chapter 4 Operational Testing and Calibration 61

Transducer Data

Press the Transducer Data screen icon.

Figure 4.4 Press the Transducer Data screen icon

The Transducer Selection screen displays.

Figure 4.5 Transducer data selection screen

From here you can set the analog data display associated with each transducer. For example, if you
press the SET ANALOG 0 screen icon as shown in figure 4.X, the following options display in a drop
down menu.

Exhl Flow Diff Press
Exhalation Flow
Turbine Flow
Turbine Speed

Figure 4.6 Transducer data selection options

L1534 Revision B December 2004

62 Vela Ventilators

In this example, the transducer associated with Analog 0 is set to display Turbine Speed.

Set each analog value to one of the transducers in the drop down menu. Press EXIT to return to the
Extended Functions screen.

For instructions on how to view this data as a displayed waveform, see Chapter 5, Maintenance &
Troubleshooting.

Transducer Tests

To access the transducer test screen press the Transducer Tests screen icon.

Figure 4.7 Press transducer tests icon

The transducer tests screen appears with icons for the Turbine Differential, Exhalation Differential and
Circuit Pressure transducers.

Figure 4.8 Transducer test screen

Press the Turbine Differential (TURB DIFF) screen icon.

L1534 Revision B December 2004

Service Manual Chapter 4 Operational Testing and Calibration 63

Figure 4 9 Press TURB DIFF icon

The following messages appear in sequence in the message area at the bottom left of the touch
screen.

Turb Diff Pressure Xdcr Test – Requested

Turb Diff Pressure Xdcr Test – In Progess

Turb Diff: XXX Passed (where XXX is the transducer reading within range)

Or

Turb Diff: XXX Failed (where XXX is the transducer reading OUT of range)

Press the Exhalation Differential Pressure (EXHL DIFF) screen icon.

The following messages appear in sequence in the message area at the bottom left of the touch
screen.

Exhl Diff Pressure Xdcr Test – Requested

Exhl Diff Pressure Xdcr Test – In Progess

Exhl Diff: XXX Passed (where XXX is the transducer reading within range)

Or

Exhl Diff: XXX Failed (where XXX is the transducer reading OUT of range)

Press the Circuit Pressure (CIRC PRESS) screen icon.

The following messages appear in sequence in the message area at the bottom left of the touch
screen.

Circ Pressure Xdcr Test – Requested

Circ Pressure Xdcr Test – In Progess

Circ Press: XXX Passed (where XXX is the transducer reading within range)

Or

Circ Press: XXX Failed (where XXX is the transducer reading OUT of range)

L1534 Revision B December 2004

64 Vela Ventilators

Version Information

To access the software version information screen, press the VERSION INFO screen icon.

Figure 4.10 Press the Version Info icon

The Versions screen, showing the versions of all software installed on the machine, displays.

Note

The version information shown in figure 4.X is an example only. Your machine will have different versions of
software depending on the date of sale and the updates loaded.

Figure 4 11 Sample Version information screen

L1534 Revision B December 2004

Service Manual Chapter 4 Operational Testing and Calibration 65

Date & Time

The date and time can be set and the ventilator hours of use (Hour Meter) can be viewed by pressing
the Date/Time screen icon.

Figure 4.12 Press Date/Time icon

Figure 4.13 Date/Time and Hour Meter screen

To adjust the date and time, select by pressing the touch screen directly over the control to be adjusted
(see figure 4.X).

Figure 4.14 Select the month control

L1534 Revision B December 2004

66 Vela Ventilators

Adjust by turning the Data Dial clockwise to increase, or counter clockwise to decrease, the value.

Figure 4.15 Data Dial

FiO2 Calibration

See the Calibration section of this Chapter.

Ventilator Setup

To access the ventilator setup options, press the Vent Setup screen icon.

Figure 4.16 Press Vent Setup icon

L1534 Revision B December 2004

Service Manual Chapter 4 Operational Testing and Calibration 67

Figure 4.17 Ventilator Setup Screen

Low Min Volume Off

There are two ranges possible for the Low Minute Volume Alarm. They are OFF to 99.9 liters and 0.1
to 99.9 liters. The Low Min Vol Off Disable/Enable screen icon, allows you to toggle between the two
ranges.

Figure 4.18 Low Min Vol Off Enabled

L1534 Revision B December 2004

68 Vela Ventilators

Locks Disabled

Toggles the control Locks on and off.

Figure 4.19 Locks Enable/Disable

FiO2 Monitor Disabled

Disables or Enables the FiO2 Monitor Function.

Figure 4.20 Monitor enable/disable

L1534 Revision B December 2004

Service Manual Chapter 4 Operational Testing and Calibration 69

Altitude Adjustment

Allows for adjustment of altitude in feet or meters above sea level.

Figure 4.21 Altitude feet/meters

Figure 4.22 Altutude in Meters

To adjust the value, select the control,

The Altitude screen icon toggles between Feet and Meters
and the selection is reflected in the control label (see figure

4.22)

then adjust using the data dial.

L1534 Revision B December 2004

70 Vela Ventilators

Language Selection

A choice of 5 languages is available (see figure 4.23). Select a language by pressing the appropriate
screen icon. Press EXIT to leave the Ventilator Setup screen and return to the Extended Functions
screen

Figure 4.23 Exit Ventilator Setup

Press EXIT again to exit the Special Functions menu

Figure 4.24 Exit Special Functions

The ventilator will begin operation at previously selected settings.

Set up the patient and ventilator operational settings per the instructions your Operator’s Manual.

L1534 Revision B December 2004

Service Manual Chapter 4 Operational Testing and Calibration 71

Verification tests

1. Before attaching the Vela to a new patient, perform the following Operational verification checks.

2. Turn on the Vela, choose New Patient and Accept. This will return all settings to the defaults.

3. To check monitor performance, allow the ventilator to operate for two minutes. View the

monitored parameters. The values should appear as follows:

Parameter Value

Minute volume 6 L+ 1.2 L
Tidal Volume 500 ml + 100 ml
I:E Ratio 1:6.1 + 10%
Breath Rate 12 bpm + 2 bpm
PIP Should equal manometer display + 5 cmH2O
MAP N/A
PEEP 5 cmH2O + 2 cmH2O
Inspiratory Time 0.68 seconds + .05 seconds

3. Check the alarms as follows:

a. Power Fail Check

i. Remove the power cord from the wall. The ventilator should do the following:

1. Switch to battery power.

2. Sound the audible alarm.

3. Turn the AC Power Source indicator OFF.

4. Display the BATTERY ON message in the alarm window.

5. LED for internal battery will light.

ii. Press the Alarm Reset button to clear the alarm.

iii. Plug the AC power cord back into the wall socket.

b. High Pressure Limit Check

i. Lower the High Pressure Alarm setting to 5 cmH2O below the Peak Inspiratory

Pressure (PIP). When the ventilator cycles to inspiration and the high pressure
limit is violated, the high pressure alarm should occur. When this happens the
ventilator should:

6. Immediately cycle into the expiratory phase.

7. Sound the audible alarm.

L1534 Revision B December 2004

72 Vela Ventilators

8. Display the HIGH PRES message in the alarm window.

ii. Return the High Pressure Alarm setting to 5 cmH2O above PIP, and press the

Alarm Reset button to clear the alarm.

This completes the performance check. The following Ventilator Performance Checklist may be used to
document each Performance Check for your records.

L1534 Revision B December 2004

Service Manual Chapter 4 Operational Testing and Calibration 73

Vela Ventilator Performance Checklist

This checklist is for use during the Vela Operational Verification Procedure.

Serial Number_______________ Hours______________ Date_____________

Verification Steps:

Verification Step Check & Initial

1. Inspect the ventilator and components for appearance and cleanliness.
Confirm the Exhalation valve, diaphragm, and air intake filter and test lungs
are correctly installed. Wipe the ventilator clean if needed using a cloth
moistened with an approved cleaning solution.

2. Enter the User Verification Test (UVT). Press the Patient Removed touch
screen icon.

3. Test the alarm volume. Adjust as required.

4. Confirm the proper functioning of the front panel lamps and LEDs.

5. Confirm the proper functioning of the membrane switches.

6. Complete the internal filter performance check.

7. Check the patient breathing circuit on the ventilator and conduct a leak test.
Make sure all needed components are firmly attached in the circuit.

8. Exit the UVT and conduct performance test.

Set the parameters to the following recommended settings:

Mode

Tidal Volume

Peak Flow

A/C

500ml

60 lpm

Inspiratory Pause

Sigh

Square Waveform

OFF

OFF

OFF

Breath Rate

PEEP/CPAP

Sensitivity

Pressure Support

Pressure Control

% O2

12 bpm

5 cmH2O

OFF

OFF

OFF

21

Bias Flow

Altitude

Inspiratory Time

Termination Sensitivity

Variable Time Termination

Flow Termination

10 lpm

Current

0.3 sec

25%

3.0 sec

OFF

L1534 Revision B December 2004

74 Vela Ventilators

Set the variable alarm controls as follows:

Alarm Control Setting

High Pressure PIP plus 5 cmH2O

Low Pressure PIP minus 10 cmH2O

Low Minute Volume 4 Liters

High Breath Rate 16 bpm

Apnea Interval 20 secs

Verification Step Check & Initial

9. After at least two minutes of operation compare the displayed readings to the
following:

Display Reading

Minute Volume 6L +/- 1.2L

Tidal Volume 500ml +/-100ml

I:E Ratio 1:6.1 +/-10%

Breath Rate 12 bpm +/-2 bpm

PIP Equal to Manometer +/- 5

MAP NA

PEEP 5 cmH2O +/-2 cmH20

Inspiratory Time 0.68 sec +/-0.5 sec

Verification Step Check & Initial

10. Check alarms

A. Power Fail Check

B. High Pressure Limit Check

Signature: _____________________________________________________

Procedure Complete

L1534 Revision B December 2004

Service Manual Chapter 4 Operational Testing and Calibration 75

Calibration

Note

All personnel performing preventive maintenance and product repair must be trained and certified by VIASYS
Healthcare to service the product

Test Set-up

To calibration port

To pressure manometer
(0 to 60cmH2O)

To pressure manometer
O-60 psig

Figure 4.34 Callibration setup #1

High pressure gas
source (wall or bottled)
with 0-50 psig regulator
attached

To calibration port

Figure4.35 Calibration setup #2

Power Up Verification/Service Verification Tests

1. Remove the top cover and battery tray as described in Chapter 3.

2. Locate DIP Switch 1 on the Main PCBA on the rear of the front panel. Place it in the ON position,
as shown in figure 3.

L1534 Revision B December 2004

76 Vela Ventilators

PT 501

P1P1P2 P2

11

TURBINE EEPROM

S/N: XXXXXXXXXXXX

BIRD C 1995

PT 500

TBIRDTM 1995

PAL P/N 15532

3. Connect the Vela to a properly grounded AC source. Turn on power to the unit.

Figure 4.36 Main PCB

MeasurementMod

Turbine

Differential

Transducer

P1 P2 P1 P2

Exhalation

Pressure

Transducer

Exhalation

Flow

Transducer

Overrang

e

Underrang

e

12345678

ON

MANOMETER

GAS PRESSURE

Low

Range

20

cmH2O

250

cmH2O
185 mm

Hg

GAS FLOW RATE

Low

Range

5 lpm

2(%)/N2

O

5 lpm

Air

5 lpm

2(%)/N2O

O

e

PRESSURE

High

Range

20
psi

100
psi

5170

mmHg

High

Range

5 lpm

2(%)/N2

O

180 lpm

Air

20 lpm

2(%)/N2O

O

P-

VOLUME RATE/TIME

3 liters

2(%)/N2

O
3 liters

Air

Minute

2(%)/N2O

O

Lo
wPressur
eRang
e

4 psi

maxdifferenti

al

789

123

0

F
1

P
+

15
psima

x

Rate
BPM

inspirator y

T

expiratory

T

I:E

Ratio

8

7

6

5

4

3

2

1

ON

Zer

o

Peak

654

/Continuou
s

Rese

t

Ente

r

F
2

Hig

hPre ssur
eRang

P

P-

e

+

100 psi

maxdifferenti

al

100

psima

x

Lo

Hig

wFlo

hFlo

wRang

wRang

e

e

Clean,

Clean, dry

drygas

gasonl

only5

y180

lpmmax

lpmmax

.

.

Attach to the

tran sducer needin g

P/N 33903

calibration

Figure 4.37 Location of transducers

4. The ventilator performs its Power On Self Test. When the self-test is complete, the screen displays
“flat” waveforms and the ventilator makes no attempt to deliver a breath. This indicates that you are
in a “Service” mode

5. The audible alarm should sound, press the alarm reset button to silence alarm.

6. Press the MAIN icon at the top of the touch
screen

7. The SVT TEST SELECT screen displays.

8. Press CALIBRATION to access the
transducer calibration screen (see figure 4.7)

Figure 4.38 SVT Test Select Screen

L1534 Revision B December 2004

Service Manual Chapter 4 Operational Testing and Calibration 77

Figure 4.39 Calibration selection screen

Exhalation Pressure Transducer

1. Press the EXH PRESS XDCR touch screen icon from the CALIBRATION SELECT Screen. The

EXHL PRESS CALIB screen displays showing both pressures as “Pending” and with the
instruction “Apply 0 cmH2O and press button”.

Figure 4.40 Exhalation Pressure Transducer Calibration screen #1

2. Disconnect tubing from the exhalation pressure transducer before continuing with the procedure

(see figure 4.6 for location of the transducers ).With no tubing attached to the exhalation pressure
transducer, press the PRESSURE APPLIED touch screen icon for zero calibration.

3. When the calibration is complete, the screen legend changes to read “Apply 60 cmH2O, Press

Button” and the zero pressure value now says “OK” with an A/D value added.

Figure 4.41 Exhalation Pressure Transducer Calibration screen #2

5. Attach the calibration setup shown in figure 1 to the Exhalation Pressure Transducer port (see

figure 4 for location).

6. Turn the calibration syringe handle clockwise to generate positive pressure.

L1534 Revision B December 2004

78 Vela Ventilators

7. When the pressure manometer reads 60 cmH2O +/- 0.6 cmH2O, press the PRESSURE APPLIED
touch screen icon.

Figure 4.42 Exhalation Pressure Transducer Calibration screen #3

8. When the calibration is completed, the screen displays OK for both calibrations. SAVE
CALIBRATION and CANCEL CALIBRATION. Press SAVE CALIBRATION to save and return to
the transducer calibration selection screen.

CAUTION

Make sure that your pneumatic connection is to the Exhalation Pressure transducer before applying 60 cmH2O
pressure. If the 60.0 cmH2O pressure is inadvertently applied to the Exhalation Differential (Flow) transducer it

will permanently damage the transducer.

Turbine Pressure Transducer

1. From the CALIBRATION SELECT screen, press TURB PRESS XDCR.

2. The first Turbine Pressure calibration screen displays showing both calibration pressures as
pending and with the legend “Apply 0 cmH2O and press button”.

Figure 4.43 Turbine Pressure Zero calibration screen #1

2. Disconnect tubing from the transducer before continuing with the procedure. See figure 4.6 for
location of the transducers

3. With no tubing attached to the turbine pressure transducer, press the PRESSURE APPLIED touch
screen icon for zero calibration.

4. The screen legend changes to read “Apply 60 cmH2O, Press Button” and the status of the zero
calibration line now reads “OK” with a recorded A/D value.

L1534 Revision B December 2004

Service Manual Chapter 4 Operational Testing and Calibration 79

Figure 4.44 Turbine Pressure 60 cmH2O calibration screen #2

5. Attach the calibration setup shown in figure 1 (available as a kit from VIASYS Healthcare) to the

port P2 on the turbine pressure transducer (see figure 4.6 for location).

6. Turn the calibration syringe handle clockwise to generate positive pressure.

7. When the pressure manometer reads 60 cmH2O +/- 0.6 cm H2O, press the PRESSURE APPLIED

touch screen icon.

8. The screen displays OK for both pressures and SAVE CALIBRATION and CANCEL

CALIBRATION. Press SAVE CALIBRATION to save and return to the transducer calibration
selection screen.

Figure 4.45 Turbine Pressure 60 cmH2O calibration screen #3

9. Reconnect tubing to the port after calibration.

CAUTION

Make sure that your pneumatic connection is to the Turbine Differential transducer before applying 60 cmH2O
pressure. If the 60.0 cmH2O pressure is inadvertently applied to the Exhalation Differential (Flow) Transducer it
will be permanently damaged and require replacement..

L1534 Revision B December 2004

80 Vela Ventilators

Exhalation Flow Transducer Calibration

1. From the CALIBRATION SELECT screen, press EXL FLOW XDCR. The first Exhalation
Differential Pressure (Flow) calibration screen displays.

Figure 4.46 Exhalation Differential Pressure (Flow) screen #1

2. Disconnect tubing from the transducer before continuing with the procedure. See figure 4.6 for
location of the transducers

3. With no tubing attached to the transducer, press the PRESSURE APPLIED touch screen icon for
zero calibration.

4. When the calibration is complete, the status of the zero pressure line reads “OK” and an A/D value
is recorded. The screen legend changes to read “Apply 3 cmH2O, Press Button.”

Figure 4.47 Exhalation Differential Pressure (Flow) screen #2

5. Attach the calibration setup shown in figure 1 to the Exhalation Differential (Flow) Transducer port
P2 (see figure 4.6 for location).

6. Turn the calibration syringe handle clockwise to generate positive pressure.

7. When the pressure manometer reads 3 cmH2O +/- 0.6 cm H2O, press the PRESSURE APPLIED
touch screen icon.

8. When the calibration is complete, the status of the zero pressure line reads “OK” and an A/D value
is recorded. The screen displays SAVE CALIBRATION and CANCEL CALIBRATION. Press SAVE
CALIBRATION to save and return to the transducer calibration selection screen.

L1534 Revision B December 2004

Service Manual Chapter 4 Operational Testing and Calibration 81

Figure 4.48 Exhalation Differential Pressure (Flow) screen #3

9. Remove calibration setup from exhalation differential pressure (flow) transducer port and reconnect

tubing before continuing.

Oxygen Pressure Transducer Calibration

1. From the CALIBRATION SELECT screen, press O2 PRESS. The Oxygen Pressure Transducer

Calibration screen #1 appears.

Figure 4.49 O2 Pressure calibration screen #1

2. With no tubing attached to the Vela, press the PRESSURE APPLIED touch screen icon for zero

calibration.

4. When the calibration is complete, the status of the zero pressure line reads “OK” and an A/D value

is recorded (see figure 4.19). The screen legend changes to read “Apply 50 cmH2O, Press Button.”

L1534 Revision B December 2004

82 Vela Ventilators

Figure 4.50 O2 Pressure calibration screen #2

5. Attach the calibration setup tube to the
nebulizer port on the front of the Vela (see
figure 4.20).

6. Press the Nebulizer membrane button on the
front panel to open the solenoid.

7. Apply gas from the high pressure gas source
at 50 psig pressure.

8. When the pressure manometer reads 50
psig, press the PRESSURE APPLIED touch
screen icon.

9. When the calibration is complete, the status
of the 50 psig pressure line reads “OK” and
an A/D value is recorded (see figure

4.21).The screen displays SAVE CALIBRATION and
CANCEL CALIBRATION. Press SAVE CALIBRATION to
save and return to the transducer calibration
selection screen.

Figure 4.51 Nebulizer port on the Vela

Figure 4.52 O2 Pressure calibration screen #3

L1534 Revision B December 2004

Service Manual Chapter 4 Operational Testing and Calibration 83

psig

p

Regulator calibration:

Connect to high

High pressure gas
source (wall or bottled)
with 0-50 psig regulator
attached

pressure inlet on rear

Measure pressure at
Nebulizer

ort on Vela

Figure 4.53 Calibration setup for Regulator Calibration

To Pressure
Manometer 0-60

1. Enter the SVT mode as detailed in this procedure then press the MAIN icon. From the

CALIBRATION SELECT screen, press the SOLENOID touch screen icon to enter the solenoid
mode.

2. Connect gas source to the high-pressure port on the rear panel (see figure 18). Using a 0-50 psig

regulator, apply 50 psig gas pressure. In turn, press the O2-0, O2-1, and O2-2 solenoid touch
screen icons.

3. Using a calibrated manometer, measure the pressure at the Nebulizer port on the front of the

ventilator for each solenoid (see figure 17). It must read 40 psig +/- 1. Adjust the internal
adjustment regulator to achieve the correct pressure at the Nebulizer port (see figure 4.22)

High Pressure
O2 Port

Figure 4.54 Vela Rear Panel

3. Perform the Operational Verification Procedure described in this chapter once the calibration is

complete. .

L1534 Revision B December 2004

84 Vela Ventilators

Note

All personnel performing preventive maintenance and product repair must be trained and certified by VIASYS
Healthcare to service the product

Figure 4.56 Internal adjustment regulator location

L1534 Revision B December 2004

Service Manual Chapter 4 Operational Testing and Calibration 85

Figure 4.57 Location of O2 Blender solenoids

L1534 Revision B December 2004

86 Vela Ventilators

Oxygen Sensor Calibration

From the Special Functions menu, press the FIO2 MON CALIBRATION touch screen icon

Figure 4.58 Special Functions menu,

The following screen will appear.

Figure4.59 FiO2 Sensor Calibration Ambient Air

Attach 100% O2 at 50psig to the high-pressure inlet on the rear of the Vela.

Press the START AMB CALIBRATION touch screen icon. The machine will take 3-5 minutes to
perform the calibration and the following screen will appear while the calibration is in progress.

Figure 4.60 Ambient Calibration in progress.

L1534 Revision B December 2004

Service Manual Chapter 4 Operational Testing and Calibration 87

When calibration is complete, the following screen will appear showing the new ambient value.

Figure 4.61 Ambient calibration complete showing new value

Press the START 100% CALIBRATION touch screen icon. The calibration will take 3-5 minutes during
which time the following screen will appear.

Figure 4.62 100 %FIO2 calibration in progress

When the calibration is complete the following screen will appear.

Figure 4.63 FIO2 calibration complete, new values showing.

If the calibration values are acceptable, press EXIT to exit the calibration sequence.

L1534 Revision B December 2004

88 Vela Ventilators

L1534 Revision B December 2004

Chapter 5 Maintenance & Troubleshooting

Routine Maintenance Procedures

Replacing the software PCMCIA cards

Occasional software upgrades may require replacement of the internal PCMCIA card that drives the
Vela. This is easily access by removing the screws holding the ventilator cover and sliding the cover off
towards the rear as shown in figure 5.1.

Figure 5.1 Slide cover towards rear

CAUTION

The SVGA Output ribbon cable lies directly beneath the top cover assembly running from the front of the Vela to
the rear. It can be damaged if care is not taken when removing the cover. Make sure that the cover clears this
cable before sliding it back.

The card is located towards the front of the Vela beneath the right panel. To replace the card, refer to
figure 5.2 and do the following:

Card eject button

Figure 5.2 PCMCIA cards in place

L1534 Revision B December 2004

90 Vela Ventilators

Note

If a new version of software is installed, it can take up to two minutes for the software to download to the
ventilator. During this time the ventilator is inoperative and the audible alarm will sound. The ventilator will
resume normal operation once the download is complete.

1. Press the protruding button beneath the card to eject.

2. To install, make sure the arrow on the card is pointing up then push the card into the

applicable slot until it clicks into place.

WARNING

It is essential when working inside the ventilator to protect against static discharge, which can damage the
ventilator and cause it to become inoperative. ALWAYS take standard ESD precautions before removing the
ventilator cover.

Replacing the external A/C fuses.

Remove the power cord protective cover. Unplug the
A/C power cord.

Figure 5.3 Remove the power cord guard

The AC power module is a universal module for A/C
voltages from 100-240 volts. Using a flat bladed
screwdriver, pry open the cover. Using the same
screwdriver, loosen and pull out the red fuse holder as
shown in figure 5.4.

Remove the fuses from both sides of the fuse holder
and replace with fuses P/N 71612(available from
VIASYS Healthcare customer support.

Figure 5.4 Pry out the fuse holder

WARNING

It is important that the fuses are replaced with the same type and value as those removed. Failure to do so can
result in ventilator malfunction.

L1534 Revision B December 2004

Service Manual Chapter 5 Maintenance & Troubleshooting 91

To insert the fuse holder containing the new fuses, make sure
the 4 metal tabs are facing up as shown in figure 5.5 and
carefully push the fuse holder in to the A/C power module until it
seats

Figure 5.5 Insert fuse holder with metal tabs showing

The Annual 5000 hour P.M. Procedure

Replacing the ambient air filter.

The Ambient Air Filter is located at the rear of the ventilator below the rear panel. It is a high-density
foam insert. To remove it, pinch and pull away from the ventilator as shown in figure 5.6. The filter will
lift out. Replace with a clean filter. To prevent the entry of dust into the ventilator, press the filter in
around the edges to ensure a snug fit.

Figure 5.6 Remove high density foam ambient air fIlter

Replacing the fan filter

Pop out the fan filter retaining grid, using screwdriver.
Pinch & pull out the foam filter (see figure 5.7)

To install a new filter, carefully place the new filter over
the fan housing and place the retaining grid back onto
the fan housing. Check to make sure there are no
creases or folds in the foam filter as this will reduce its
efficiency and could allow contaminants into the
ventilator body. Push the retaining grid until all four
“tabs” click into place.

Figure 5.7 Pinch and remove foam fan filter

L1534 Revision B December 2004

92 Vela Ventilators

Replacing the filter, retaining ring & check valve on the low pres O2 fitting

Using a ¾ inch open-ended wrench, unscrew the low­pressure oxygen fitting from the back panel as shown in
figure 5.8.

Figure 5.8 Unscrew the low pressure O2 fitting

Remove the white cone filter and dislodge & remove the white Delrin
retaining ring (use needle nose pliers if needed).

Using needle nose pliers, the black duck billed check valve should come
out easily.

Figure 5.9 White Delrin retaining washer
and duck billed check valve

To replace, place the black duck billed check valve and insert it into the fitting. Tap lightly with the end
of a screwdriver to make sure it is seated then place the Delrin retaining ring over it with the “lip” facing
into the Vela as shown in figure X.X. Place the new cone filter onto the Delrin ring and push gently until
you are sure it has seated correctly. Replace the fitting and tighten down with the ¾ inch wrench.

Replacing the filter, retaining ring and check valve on the hi pressure fitting

Using a ¾ inch open-ended wrench, unscrew the two­piece high-pressure oxygen fitting. Remove the white
cone filter, the white Delrin washer & the black duck
billed check valve as described above.

Install the black check valve and make sure it is seated. Install the
white Delrin washer with the lip down as shown in figure 5.10.
Place the cone filter on the delrin washer and push gently to seat.
Replace and tighten down the fitting with a ¾ inch open-ended
wrench.

Figure 5.10 Installing the Delrin Washer

Figure 5.9 Unscrew the high pressure O2 fitting

L1534 Revision B December 2004

Service Manual Chapter 5 Maintenance & Troubleshooting 93

Replacing the muffler and muffler filter assemblies

Note

Always take precautions against static discharge when working with the
ventilator. Retain all hardware for re-assembly.

From the back panel, remove the power cord guard by
unscrewing the two retaining screws as shown in figure

5.11. Unplug the power cord.

Unscrew the screws holding on the Vela cover. Slide cover towards the rear of the machine and off.

Figure 5.11 Removing the power cord guard

Figure 5.12 Slide cover off towards the rear

Remove the 4 screws securing the battery tray & lift it, and the attached large capacitor assembly out.
Lean the battery tray and capacitor assembly against the left side of the Vela while you disconnect the
large white Molex DC power connector. Set the complete assembly aside.

Note

When the batteries are disconnected, the system will automatically re-set the battery status memory and will
initiate an 18-hour re-charge cycle upon re-connect. During this period, the red DC status light will remain on.
If the DC status light remains lit after the initial charging period has expired, contact VIASYS tech support as
described in Appendix A for a replacement battery.

Remove the right panel. There are two screws in the rear of the ventilator, one in the front top and one
on the lower left side in the center.

Pull the panel out from the rear first, then ease to the back & tilt out. Lay the assembly flat. The
Mufflers are now accessible.

L1534 Revision B December 2004

94 Vela Ventilators

Replacing the muffler/filter assemblies.

Silicone Elbow

To remove & replace the mufflers and filter, first ease out the two
silicone elbows from the muffler assembly front panel.

Loosen the 6 screws on the front plate,
& remove the front plate. Remove and
replace the two black o-rings on the
front panel.

Using needle nose pliers, firmly grasp the metal
grid inside the R side muffler/filter assy. Pull
firmly towards you and the muffler/filter should
slide out. Repeat with the left side muffler.

You will see that only the Right side muffler has a filter attached,
the L side has wire muffler only.

L1534 Revision B December 2004

Service Manual Chapter 5 Maintenance & Troubleshooting 95

To install the new filter/muffler
assemblies, push the left side
muffler (with no filter) firmly in and
make sure it is pushed all the way
into the housing. Insert the right
side muffler with the filter, ensure
that the seam on the filter lays
horizontally and press home.
Replace the front cover with the
new O-rings and reattach with six
screws.

Install the two silicone elbows into the muffler
cover and push in the center to make sure
they are seated.

Replacing the left panel w/power PCB.

1. Lean the right panel up to the Vela, slide in the front then push in the rear. Reattach the screws

on the rear (2), front (1) and at the lower edge of the right side (1).

2. To install the battery tray, re-attach the large white Molex connector and make sure it lays

between the muffler elbows as you replace the battery tray onto the Vela. This will ensure that
there is enough space for the large capacitor attached to the Battery tray. Re-attach the 4
screws holding the battery tray in place. Reconnect the ribbon cable.

3. Slide the cover in place from the rear and push the top front edge home under the lip. Attach the

screws.

4. Reattach the power cord and re-attach the power cord guard with the two screws.

L1534 Revision B December 2004

96 Vela Ventilators

Troubleshooting

If The Ventilator Does not Turn ON

If you turn the power switch ON and the ON indicator does not illuminate, perform the troubleshooting
procedures given in Table 5.1.

Table 5.1
Troubleshooting Power-Up Problems

PROBLEM POSSIBLE CAUSE ACTION

Ventilator plugged into an AC
source but does not power up.

Ventilator attached to alternate
external DC power source but
does not power up.

No power at AC outlet, or the
AC/DC select switch is in the ALT
PWR SOURCE position, or the AC
Line Voltage switch is set to the
wrong voltage.

If the external source is a battery,
the battery may not be charged, or
the AC/DC select switch may be in
the AC position.

Try connecting to a known good AC
power source. Make sure the AC/DC
switch is in the AC position. Make
sure, the voltage setting of the
ventilator matches the voltage of your
power source. Check the fuse
assembly if the ventilator still does not
power up, Contact your Bird Products
Certified Service Technician. Check
the DC voltage output supply from
transformer at J9. Check DC voltage
at J3. Black is ground. Red is 5 volts
DC and Yellow is 14.7 to 20 DC. If
voltage is not present, replace Power
Supply PCB.
Plug the ventilator into a known good
AC source, or to a known good
battery and see if it powers up. If
using a 12VDC power source, set the
AC/DC select switch to the ALT PWR
SOURCE position. Check the fuse
assembly. If the ventilator still does
not power up, contact your Bird
Products Certified Service
Technician. Check DC voltage at J3.
Black is ground. Red is 5 volts DC
and Yellow is 14.7 to 20 DC. If
voltage is not present, replace Power
Supply PCB.

L1534 Revision B December 2004

Service Manual Chapter 5 Maintenance & Troubleshooting 97

Reviewing the Transducer Waveforms

To review the transducer waveforms set in Chapter 4, in normal operational mode press the touch
screen immediately over the waveform heading display on the MAIN screen.

Figure 5.13 Select waveform displayed

A scrolling drop down menu displays all the possible waveform choices. To scroll through the choices
use the Data Dial.

Figure 5.14 Drop down menu

From the choices displayed, select the transducer you wish to review (in this case, transducer 0) and
press the Accept membrane button.

Figure 5.15 Selecting Xducr

L1534 Revision B December 2004

98 Vela Ventilators

The waveform immediately changes to display the signal associated with the selected transducer (in
this case it is Turbine Speed).

Figure 5.16 Turbine Speed waveform displayed

L1534 Revision B December 2004

Appendix A Contact & Ordering Information

How to Call for Support

To get help on performing any of the preventive maintenance routines, or to request service on your
ventilator, contact VIASYS Healthcare Customer Care:

Technical Support

Hours: 7:00 AM to 3:30 PM (PST) Monday through Friday
Phone: [phone]
Fax: [phone]

VIASYS Healthcare Customer Care Helpline

Hours: 24 hours, seven days a week

Phone: [phone] (From within the US)
Fax: [phone]

VIASYS Healthcare Critical Care
1100 Bird Center Drive
Palm Springs, CA 92262-8099
U.S.A.

Phone: [phone]
[phone]

Fax: [phone]

L1534 Revision B December 2004

100 Vela Ventilators

Ordering Parts

To obtain Vela ventilator parts contact customer service at:

Customer Service:

Hours: 7:00 Am to 3:30 PM (PST)

Monday through Friday

Phone: [phone]

[phone]

Fax: [phone]

L1534 Revision B December 2004