Unitek Miyachi LW250 Manual

USER'S MANUAL NO. 990-605
REVISION B: May, 1997
OPERATION, MAINTENANCE
AND SERVICE MANUAL
FOR THE
LW250 PULSED Nd: YAG LASER
Copyright © 1997
Unitek Miyachi Corporation
All Rights Reserved
1820 South Myrtle Avenue, P.O. Box 5033, Monrovia, CA 91017-7133
Telephone: [phone] FAX: [phone]

LW250 Pulsed Nd: YAG LASER
990-605 REV B: May, 1997 i
Copyright © 1997, Unitek Miyachi Corporation
The engineering designs, drawings and data contained herein are the proprietary work of
UNITEK MIYACHI CORPORATION and may not be reproduced, copied, exhibited or
otherwise used without the written authorization of UNITEK MIYACHI CORPORATION.
Printed in the United States of America
Revision Record
Revision EO Date Basis of Revision
A 16887 1/97 Original publication
B 17016 3/97 Add steam-distilled water
applicability. Moderate changes
to water drainage procedures.

LW250 Pulsed Nd: YAG LASER
990-605 REV B: May, 1997 ii
CDRH COMPLIANCE STATEMENT
The Unitek Miyachi Corporation LW250 Pulsed
Nd:YAG Laser is certified to be fully compliant with all
applicable standards and regulations as set forth by the
United States of America's Health and Human Services
(HHS), Food and Drug Administration (FDA), Center for
Devices and Radiological Health (CDRH), standard 21
CFR 1040.10 for Class IV laser devices. Please refer to
CDRH Accession #9311157-03.

LW250 Pulsed Nd: YAG LASER
990-605 REV B: May, 1997 iii
FOREWORD
Thank you for purchasing a Unitek Miyachi Corporation
LW250 Pulsed Nd: YAG Laser.
Upon receipt of the LW250 Laser, please thoroughly
inspect it for shipping damage prior to it's installation.
Should there be any damage, please immediately contact
the shipping company to file a claim, and notify Unitek
Miyachi Corporation at:
Unitek Miyachi Corporation
1820 South Myrtle Ave.
Monrovia, CA 91017-7135
Phone: [phone]
FAX: [phone]
The contents of this manual are subject to change without
notice.
If you have any questions about the contents of this
manual, or find any errors or omissions in it, please
notify Unitek Miyachi Corporation.
Unitek Miyachi is not responsible for any losses due to
improper use of this product.

LW250 Pulsed Nd: YAG LASER
990-605 REV B: May, 1997 iv
CAUTION
This instruction manual describes how to operate, main-
tain and service the LW250 Laser, and provides instruc-
tions relating to it's SAFE use. Procedures described in
this manual MUST be performed as detailed by QUALI-
FIED and TRAINED personnel.
For SAFETY, and to effectively take advantage of the
full capabilities of the LW250 Laser, please read this
instruc-tion manual and the Laser Safety Manual
thoroughly before attempting to use the LW250 Laser.
Procedures other than those described in this manual or
not performed as prescribed in this manual, may expose
personnel to electrical hazards and/or laser radiation
hazards.
After reading this manual, retain it for future reference
when any questions arise regarding the proper and SAFE
operation of the LW250 Laser.

LW250 Pulsed Nd: YAG LASER
990-605 REV B: May, 1997 v
CONTENTS
CHAPTER 1: Precautions
Prior to Using The LW250 Laser .......................................... 1-1
Installation Site and Electrical Supply ...................................... 1-1
Carrying The LW250 Laser .............................................. 1-1
HandlingTheFiberOpticCables ......................................... 1-1
Removal of Oscillator Head Hold Down Brackets ............................ 1-3
OperationinColdWeather .............................................. 1-3
LaserOperationArea................................................... 1-4
OperatingtheLaser .................................................... 1-4
LaserSafetyOfficer.................................................... 1-4
CautionsandWarningIndications......................................... 1-4
Cleanliness ........................................................... 1-4
DesignIntegrity ....................................................... 1-4
Maintenance.......................................................... 1-4
CHAPTER 2: System Description
SystemFeatures ....................................................... 2-1
ExternalControlsandIndicators .......................................... 2-2
StatusPanel .................................................... 2-2
EmergencyStopButton ........................................... 2-3
DoorLatch ..................................................... 2-3
` MainPowerSwitch .............................................. 2-3
ControlKeySwitch .............................................. 2-3
ControlPendant ................................................. 2-3
InternalControlsandIndicators .......................................... 2-5
Coolant System Components and Controls .................................. 2-6
ExternalPanels ....................................................... 2-8
Laser Oscillator Head .................................................. 2-9

LW250 Pulsed Nd: YAG LASER
990-605 REV B: May, 1997 vi
CONTENTS (continued)
DisplayScreenDescriptions ............................................ 2-11
Schedule/MonitorScreen......................................... 2-11
MaintenanceScreen ............................................. 2-12
StatusScreen .................................................. 2-13
MonitorScreen ................................................ 2-14
CHAPTER 3: I/O SIGNAL INTERFACE
Input Signals ................................................... 3-1
ContactSignals ........................................... 3-2
TransistorSignals ......................................... 3-3
Input Signal Specifications, EXT. I/O Connector (1) .............. 3-3
Input Signal Specifications, EXT. I/O Connector (2) .............. 3-7
RemoteInterlockConnector ................................. 3-7
OutputSignals .................................................. 3-7
OutputSignalCircuits ............................................ 3-8
OutputSignalSpecifications ....................................... 3-8
OutputSignalSpecifications,EXT.I/OConnector(1) ............. 3-8
OutputSignalSpecifications,EXT.I/OConnector(2) ............ 3-10
CHAPTER 4: SYSTEM TIMING
Operation from the Control Pendant: Simultaneous Splitting of the
LaserBeamIntoTwoBranches........................................... 4-1
Operation from External Signals: Simultaneous Splitting of the
LaserBeamIntoTwoBranches........................................... 4-1
Operation from External Signals: Simultaneous Time Periods and
Simultaneous Splitting of the Laser Beam Into Two Branches ................... 4-3
Repeat Operation: Simultaneous Splitting of the Laser Beam Into Two Branches .... 4-4
Repeat Operation at High Speed (25 PPS Minimum) .......................... 4-5
CHAPTER 5: GETTING STARTED
Removing the Laser Head Oscillator Fittings ................................ 5-1
PowerCableConnections ............................................... 5-1
PreparingtheCoolingSystem ............................................ 5-2

LW250 Pulsed Nd: YAG LASER
990-605 REV B: May, 1997 vii
CONTENTS (continued)
Water Supply Replenishment ............................................ 5-2
OpticalFiberConnection................................................ 5-3
ConnectionoftheInterlockSignalCable ............................. 5-3
BeforeConnectingtheFibers ...................................... 5-3
ConnectingFibertotheFocusingUnit ............................... 5-3
Input Focusing Adjustment, Z-Axis ................................. 5-5
Input Focusing Adjustment, X-Y Axes ............................... 5-5
ConnectiontoFinalFocusingUnit .................................. 5-5
CHAPTER 6: Operating Instructions
PreparationforOperation ............................................... 6-1
TurningPowerONandOFF ............................................. 6-1
WaveformControl ..................................................... 6-5
LaserOutput ................................................... 6-5
High Speed Operation, FLASH1 FLASH2 .......................... 6-6
High Speed Operation, FLASH1 FLASH2 .......................... 6-7
Applying Multiple Weld Schedules .................................. 6-8
SettingtheOpeningandClosingofShutters................................ 6-11
SelectionWiththeControlPendant................................. 6-11
SelectionWithExternalControl ................................... 6-12
Simultaneous Laser Beam Splitting ................................. 6-12
Laser Beam Time Splitting ....................................... 6-12
LaserBeamTimeSharing ........................................ 6-12
Emitting the Laser Beam ............................................... 6-12
Chapter 7: User Maintenance
Precautions ........................................................... 7-1
CoolerMaintenance .................................................... 7-1
Air Filter Cleaning ............................................... 7-1
Water Draining Occasions ......................................... 7-2
Replacing the Ion Exchange Resin Cartridge and the
Deionized or Steam-Distilled Water ........................... 7-2
Draining the Deionized or Steam-Distilled Water ...................... 7-2

LW250 Pulsed Nd: YAG LASER
990-605 REV B: May, 1997 viii
CONTENTS (continued)
Cleaning or Replacing the Small Water Filter .......................... 7-3
ReplacingtheIonExchangeResinCartridgeandCoolantWater........... 7-4
ReplacingtheExistingFlashLamp .................................. 7-5
Replacing the Existing Deionized or Steam-Distilled Water .............. 7-5
Coolant Water Draining: For Long Term Storage; When Transporting
TheLaser;orWhenTemperatureDropsBelow0°C ............... 7-6
CleaningtheSolenoidValveStrainer ................................ 7-7
DrainingCoolingWater........................................... 7-8
ReplacingtheFlowrateController .................................. 7-8
Chapter 8: Service
Precautions ........................................................... 8-1
FlashLampRepalcement................................................ 8-1
AlignmentoftheBanIntotheFiberOpticCable ............................. 8-4
Preparation ..................................................... 8-4
Z-AxisAdjustment............................................... 8-5
X-YAxesAdjustment ............................................ 8-7
CleaningtheOptics .................................................... 8-9
Optical Component Cleaning Tools and Materials ...................... 8-9
Removing the Input Focusing Unit Optics ............................ 8-9
CleaningaDustyorDry-DirtCoatedOptic ......................... 8-10
CleaningaContaminatedOptic.................................... 8-11
Reassembling the Optical Components .............................. 8-11
OpticalFiberCleaning........................................... 8-11
Power Supply Service ................................................. 8-12
Backup Battery Replacement ...................................... 8-12
Fuse Replacement .............................................. 8-13
Troubleshooting ...................................................... 8-13
MalfunctionIndications.......................................... 8-13
MalfunctionCheckList .......................................... 8-13
RepairService ....................................................... 8-17
APPENDIXA:TECHNICALSPECIFICATIONS ................................ A-1
APPENDIXB:EXTERNALCOMMUNICATIONSINTERFACESPECIFICATIONS ....B-1
APPENDIXC:LASERSCHEDULEDATATABLE ...............................C-1
ALPHABETICALSUBJECTINDEX ......................................INDEX-1

LW250 Pulsed Nd: YAG LASER
990-605 REV B: May, 1997 ix
ILLUSTRATIONS
Figure Title Page
1-1 Oscillator Head Hold Down Brackets ................................ 1-3
2-1 ExternalControlsandIndicators .................................... 2-2
2-2 ControlPendantControls.......................................... 2-3
2-3 InternalControls ................................................ 2-5
2-4 Cooling System Components and Controls ............................ 2-7
2-5 BackCover..................................................... 2-8
2-6 TopCovers..................................................... 2-8
2-7 Laser Oscillator Head ............................................ 2-9
2-8 BranchUnitCoverPlate ......................................... 2-10
2-9 TypicalSchedule/MonitorScreen .................................. 2-11
2-10 TypicalMaintenanceScreen ...................................... 2-13
2-11 TypicalStatusScreen............................................ 2-13
2-12 TypicalMonitorScreen .......................................... 2-14
3-1 Input Contact Signals on Connector EXT. I/O (1) ...................... 3-2
3-2 Input Contact Signals on Connector EXT. I/O (2) ...................... 3-3
3-3 Input Transistor Signals on Connector EXT. I/O (1) ..................... 3-4
3-4 Input Transistor Signals on Connector EXT. I/O (2) ..................... 3-5
3-5 OutputSignalsontheEXT.I/O(1)Connector ......................... 3-9
3-6 OutputSignalsontheEXT.I/O(2)Connector ........................ 3-10
5-1 Laser Oscillator Head Fittings ...................................... 5-1
5-2 PowerCableConnections ......................................... 5-1
5-3 CoolingSystemPreparation ....................................... 5-2
5-4 InterlockSignalCableConnection .................................. 5-3
5-5 OpticalFiberInstallation .......................................... 5-4
5-6 FiberConnectorFastening......................................... 5-4
5-7 FinalFocusingUnitConnection .................................... 5-5
6-1 ScreenSelection................................................. 6-4
6-2 Waveform Composition ........................................... 6-5
6-3 CapacitorBankSwitching ......................................... 6-5