información sobre el co2

906-0002-00 Rev 9 EN 2002 Rofin-Sinar UK Ltd. ROFIN SC x10

Operating Manual

ROFIN SC x10

OEM CO2 Slab Laser


This manual is copyrighted with all rights reserved. Under copyright laws, thismanual may not be copied in whole or part or reproduced in any other mediawithout the express permission of Rofin-Sinar UK Ltd. Permitted copies mustcarry the same proprietary and copyright notices as were affixed to the original.Under law, copying includes translation into another language.

Please note that while every effort has been made to ensure that the data givenin this document is accurate, the information, figures, illustrations, tables,specifications and schematics contained herein are subject to change withoutnotice. The most recent additions and supplementary information is given in theAdditional Information Section – Appendix 2.

Rofin-Sinar UK Ltd.York WayWillerbyKingston upon HullU.K. HU10 6HD

Tel: 44 (0) 1482 650088Fax: 44 (0) 1482 650022

August 2002

906-0002-00 Rev 9 EN 2001 Rofin-Sinar UK Ltd SC x10 Contents

Contents

PageSection 1 Safety Instructions and Precautions

1.0 General Information 1-11.1 Laser Radiation Safety Standards 1-11.2 Intended Use for the Laser Equipment 1-21.3 Equipment Safety Standards 1-31.4 Training 1-31.5 Recommended Administrative Precautions 1-31.6 Laser Radiation Hazards 1-41.7 Fume and Vapour Hazard 1-61.8 Electrical Hazard 1-61.9 Safety Precautions 1-71.10 Additional Recommended Safety Precautions 1-71.11 Safety Warning Labels 1-8

Section 2 General Description

2.0 Description of Operation of ROFIN SC x10 2-12.1 Laser Head Layout 2-22.2 Technical Specification 2-32.3 Cooling Water Specification 2-7

2.3.1 General Information 2-72.3.2 Requirements and Additives 2-7

2.4 Purge Gas 2-92.5 Fuses 2-102.6 Enquiries 2-102.7 Warranty Information 2-102.8 Warranty Shipments, Returns and Adjustments 2-112.9 Service and Repair 2-11

Section 3 Installation and Operation

3.0 Delivery Check 3-13.1 Unpacking 3-13.2 Installation 3-1

3.2.1 Power Supply Installation 3-33.2.2 Water Cooling 3-43.2.3 Purge Gas 3-5

3.3 Electrical Interfacing 3-53.3.1 DC Power Supply Lamps & Enable Switch 3-93.3.2 RF Cable 3-10

3.4 Additional Info on RF Pulse Width & Duty Cycle 3-113.5 Safety Shutter Mechanism 3-113.6 Back Reflection of the Laser Beam 3-12

906-0002-00 Rev 9 EN 2001 Rofin-Sinar UK Ltd SC x10 Contents

Section 4 Maintenance

4.0 General Information 4-14.1 Optical Surfaces 4-14.2 Output Window 4-24.3 Optics Cleaning Materials 4-24.4 Cleaning Optical Surfaces 4-24.5 Purge Gas Supply 4-34.6 General Cleaning 4-3

Appendix 1 Safety Labels

Appendix 2 Additional Information


Section 1

Safety Instructions and Precautions

906-0002-00 Rev 9 EN 2002 Rofin-Sinar UK Ltd Safety 1 - 1

Section 1 – Safety Instructions and Precautions

1.0 General Information

It is strongly recommended that any personnel who are involved with theinstallation, operation or maintenance of this laser equipment should firstread and fully understand the contents of this manual and in particularSection 1 on Safety Instructions and Precautions.

If there are any questions or doubts on any of the safety aspects of theequipment, then do not hesitate to contact your nearest ROFIN sales orservice office or distributor for advice before proceeding.

The installation, operation, maintenance and repair of this laser equipmentmust only be carried out by ROFIN service personnel or trained staff whohave received correct instruction concerning the hazards associated withthis particular equipment.

Take extensive precautions to prevent exposure of laser energy to the eyeand skin from either direct or diffusely reflected laser beams. In addition,precautions must be taken to prevent the hazards of fire, electrical injuryand pollution.

The information and precautions given in the following sections areextensive but may not be complete. Laser users are advised to supplementthis information with information regarding current technological advancesas they become available.

All safety critical instructions contained within this documentationare framed with a border and printed in bold italic typeface. Inaddition, the safety warning symbol shown on the left indicates thatcare should be taken when working with or on the laser equipment.

Strict compliance with the safety precautions set out and referred to in thismanual and extreme care in use are essential to minimise the chance ofaccidental damage to the equipment or personal injury. ROFIN does notaccept liability for any damage or injury howsoever caused or arising.

The symbol given on the left is also used on the equipment and indicatesthat the user should refer to the Equipment Operator’s Manual for moreinformation on the safe operation or installation of the equipment.

1.1 Laser Radiation Safety Standards

a) The European standard for the Radiation Safety of Laser Products isEN60825. The ROFIN SC range of carbon dioxide lasers areclassified as Class 4 lasers and as such, the user should appoint aLaser Safety Officer and should be familiar with the content ofEN60825.


b) Special attention is drawn to section 3 of the EN60825 User’s Guide,clauses 10 to 13.4.

c) The United States guidelines for the manufacture and subsequentsale of laser equipment are governed by the Centre for Devices andRadiological Health (CDRH). The laser safety requirements arecovered in subchapter J of the Radiation Standards, 21 CFR. Thislaser product is designated solely for use as a component laser andtherefore does not meet all the requirements of 21 CFR 1040.10. Inthe United States it is the responsibility of the buyer of thesecomponents to ensure that the final system sold to an end usercomplies with all the relevant laser safety requirements prior to thesale of that system. The buyer is also required to provide a systemreport filing to CDRH before the system is shipped to an end user.

d) The average output power, peak power per pulse, the pulsedfrequency, the wavelength of the radiation and other specifications forthe particular carbon dioxide (CO2) laser covered by this manual canbe found in the Technical Specification in Section 2.

This is a Class 4 (Class IV) laser product. All precautions relevant tothis class of laser product should be strictly observed. Use ofcontrols or adjustments or performance of procedures other thanthose specified herein may result in hazardous radiation exposure.Strict compliance with the safety precautions set out and referred toin this manual and extreme care in use are essential to minimise thechance of accidental damage to the equipment or personal injury.ROFIN does not accept liability for any damage or injury howsoevercaused or arising.

1.2 Intended Use for the Laser Equipment

The CO2 laser equipment described in this documentation is intended to beused for processing materials in an industrial environment. The laser is asource of radiation and as such forms part of a laser processing system.The intended use of the laser is therefore determined by the type of lasersystem into which it is incorporated (e.g. cutting, welding, marking, surfaceworking) as well as by the manufacturer’s instructions.

The use of the laser equipment for applications other than theintended one constitutes misuse and the laser manufacturer, ROFIN,does not accept liability for any damage or injury howsoever causedor arising.

In addition, ROFIN does not accept liability for any damage or injuryhowsoever caused or arising where the laser equipment has beenmodified without the prior written permission of Rofin-Sinar UK Ltd.

Do not use the laser beam to heat foodstuffs as this may cause injuryand can produce poisonous substances, fumes or vapours.

Work on organic materials, such as wood or plastics may also bedangerous. Before working on any material with a laser beam, ensurethat all personnel are familiar with the applicable safety precautions.


1.3 Equipment Safety Standards

The ROFIN SC range of CO2 laser systems are manufactured to thefollowing Safety Standards:

I) The United States guidelines for the manufacture and subsequentsale of laser equipment are governed by the Centre for Devices andRadiological Health (CDRH). The laser safety requirements arecovered in subchapter J of the Radiation Standards, 21 CFR. Thislaser product is designated solely for use as a component laser andtherefore does not meet all the requirements of 21 CFR 1040.10. Inthe United States it is the responsibility of the buyer of thesecomponents to ensure that the final system sold to an end usercomplies with all the relevant laser safety requirements prior to thesale of that system. The buyer is also required to provide a systemreport filing to CDRH before the system is shipped to an end user.

II) EN60825 European Standard for the Radiation Safety of LaserProducts – Class 4 laser equipment

III) 73/23/EEC Low Voltage Directive EN60950 – Class 1 Appliance, mustbe connected to an electrical earth. Note that when the laserequipment is incorporated into other machinery, eg. a laser cuttingsystem, then the full machinery installation may have to conform toEN60204 and/or EN292 (Machinery Directive EN89/392/EEC) andany other applicable standards.

iv) 89/336/EEC Electro-Magnetic Compatibility DirectiveEN50082-2 – EMC immunity for industrial environmentsEN55011 – EMC emissions for equipment that include RF generators

1.4 Training

Training of installation, operator and maintenance personnel is mandatory.ROFIN, or its authorised distributors, can provide training on theinstallation, operation and maintenance of the ROFIN SC product range.

1.5 Recommended Administrative Precautions

i) Ensure that operators are given regular safety instruction (at leastonce per year) and have read and understood this manual.

ii) Ensure that operators have a copy of this safety information for easyreference.

iii) Observe all accident prevention regulations that are in force in thework place.

iv) Attach the correct hazard warning plates and labels to the laserequipment.

v) Ensure that untrained or unauthorised personnel do not have accessto the laser system.

vi) Ensure that the ‘laser designated area’ is properly marked out andlabelled.

vii) Combustible or flammable gases, liquids or solids can ignite whenirradiated with the laser beam. Remove any such materials from thelaser designated area.

viii) Some materials, such as metals or plastics, can give off toxicdecomposition products when processed using the laser beam.Investigate the hazards associated with the materials that are beingprocessed. Professional bodies can provide this information.

ix) Ensure that all objects which may accidentally reflect the laser beamare removed from the laser designated area.


x) Always check the safety of the laser system before beginning anywork, especially any safety shutters, beam delivery devices andnozzle systems.

1.6 Laser Radiation Hazards

The wavelength of the output beam from a Carbon Dioxide (CO2) laser canbe in the range 9.3µm to 11.5 µm. The wavelength range is invisible to thehuman eye and is in the infra-red part of the electromagnetic spectrum.

The ROFIN SC CO2 laser emits a high-power beam infra-red radiationwhich is invisible, but behaves in most other respects like visible light.

The beam is powerful enough, when focused, to cut materials such asplastic, but is potentially dangerous even without focusing.CO2 laser radiation can be absorbed by most dielectrics such as water,biological tissue, glass and plastic and is instantly absorbed by the firstabsorbent material it contacts.

CO2 laser radiation can be reflected from smooth metallic surfaces, eventhough they may be blackened.

CO2 laser radiation can be focused with lenses in order to be useful forcutting or marking applications. Beyond the focal point the laser beamrapidly diverges, causing dissipation of the energy density or intensity ofthe beam.

The Laser Aperture is clearly marked with a label stating 'LASERAPERTURE'. Avoid eye or skin exposure to direct or scattered laserradiation.

The ROFIN SC laser output beam characteristics are described in section2 (Technical Specification) of this manual.

i) Eye Protection

If laser radiation enters the eye, even after reflection from a metalobject, it can burn the surface of the eye causing permanent damage.

Because the CO2 laser beam is highly absorbed by water, the corneaand the sclera are the predominant ocular structures at risk for injuryand may suffer irreversible damage and scarring as a result of director indirect exposure to the CO2 laser beam. Severity of injury to thesestructures depends on how concentrated or diffuse the beam is andthe length of exposure time.

PERMANENT EYE DAMAGE MAY RESULT IF LASER RADIATIONIS ALLOWED TO ENTER THE EYE EITHER DIRECTLY OR BYREFLECTION FROM A METALLIC SURFACE DURINGPROCEDURES INVOLVING ACCESS TO THE LASER OUTPUT.

ALL PERSONNEL MUST WEAR SAFETY SPECTACLESSUITABLE FOR USE WITH CARBON DIOXIDE LASERS WHENTHE LASER IS IN A CLASS 4 OPERATIONAL STATE.

PERSONNEL NOT SO PROTECTED MUST BE EXCLUDED FROMTHE AREA OR ROOM CONTAINING THE LASER.


The following precautions are pertinent for protection from 9.3 - 11.5micron (µm) wavelength CO2 laser energy only.

1. As a precaution against accidental CO2 laser exposure to the outputbeam or its reflection, anyone within the area should wear theappropriate protective goggles with side shields.

2. The appropriate plastic prescription glasses may be substituted forprotective goggles at the individual's own risk since they do not haveside shield protection. (Glass can be shattered by a high powerdensity laser beam)

3. Contact lenses and reading (half) glasses do not provide sufficientprotection.

4. Glass windows normally provide sufficient protection from CO2 laserenergy, to any outside 'passer-by'.

5. Never look directly into the carbon dioxide laser light source orscattered laser light from reflective surfaces.

6. The working area must be shielded with metal, acrylic orpolycarbonate, and should incorporate a safety interlocked door.

7. The door interlock should be used to automatically disable the laserwhen the guard door is opened. In addition, the door interlock circuitshould be designed or configured such that operator intervention isrequired before the interlock circuit is remade, when the guard door isopened and then closed by the operator.

ii) Skin Protection

If laser radiation is exposed to the skin it can burn and cut the fleshcausing temporary or permanent damage.

The following precautions are pertinent for protection from 9.3 - 11.5micron (µm) wavelength CO2 laser energy only.

1. Do not place hands or any other object in the pathway of the CO2

laser beam.

2. The laser beam should never be turned on without a target toabsorb the energy.

3. Metallic objects will reflect the CO2 laser beam. Blackened metallicobjects may also be reflective to the laser beam. Objects that arebrushed or dimpled will diffuse the laser beam. Items that absorbthe laser beam will become hot.

4. In the event of an emergency (laser or non-laser related), thelaser should be shutdown immediately. Some criteria foremergency shutdown include the following:

• Faulty shutter operation• Water leaking from the laser or its power supplies• Fire• Misuse of the laser• Unauthorised use of the laser


iii) Protection against Fire

Combustible objects which are placed in the laser beam path can beset on fire.

1. A CO2 laser can ignite most non metallic materials.

2. Never operate the laser in the presence of flammable gases orliquids.

3. Never operate the laser in the presence of explosive materials.

4. Ensure the laser system is installed with the correct level of safetyinterlocking.

1.7 Fume and Vapour Hazard

Laser induced reactions can release hazardous particulate and gaseousmatter. These by-products may be poisonous. Before working on anymaterial with the laser beam, ensure that all the applicable safetystandards are being followed.

The laser beam provides the user with a ‘hot’ beam that can be used as acontrolled method of heating or burning the surface of certain materials –like a very fine flame torch.

Some materials break down chemically when they are heated and thesematerials can emit hazardous fumes in the form of gases or particulatematter eg. polyvinyl chloride (PVC) and polycarbonate.

Standard materials handbooks or the manufacturer of the material shouldbe contacted before attempting to process such materials with a laser.

In addition, fume extraction is recommended for removing the smokeplume. Specialist filters can also be used to filter the fume in the workplace.Filters must be cleaned and/or replaced in accordance with safetyregulations to prevent environmental pollution.

1. Do not attempt to process a material with a laser beam unless theheating characteristics of the material have been fully investigatedand understood.

2. Provide a method for safely shielding and extracting the fumeproduced by the laser process.

3. If you are cutting plastics, filter the cutting vapours downwards.

4. Do not cut PVC (polyvinyl chloride) with a laser beam. Thechemical heat reaction in combination with the humidity in the airwill produce hydrochloric acid. Hydrochloric acid is hazardous tothe operator and the laser system.

1.8 Electrical Hazard

Any installation, service or repair work must be undertaken by qualifiedROFIN personnel or by skilled engineers after consultation with therelevant local ROFIN Service Department. If in doubt contact the ServiceDepartment at the phone number given at the beginning of this manual.


1. Do not remove the covers from the laser or its power supplies.Removing these covers will expose voltages. In addition,removing internal covers from around the laser or its correctionoptics may allow leakage of laser light.

2. The area around the laser and its power supplies should be keptdry.

3. Never operate the laser if there is any sign of leakage of waterfrom the system. Call the local Service Department.

4. Do not operate the laser if the mains cable is faulty or frayed.

5. The laser should undergo routine inspection and maintenanceaccording to ROFIN’s recommendations, as detailed in section 4of this manual.

1.9 Safety Precautions

The ROFIN SC range of lasers incorporate various safety features asrequired by EN60825 and CDRH radiation safety standards. The end userwill be required to utilise these functions within a full system installation tomeet these safety standards. These are as follows:

i) Safety Interlocks

No sections of the laser’s protective housing can be easily openedwithout special tools. The CO2 laser has no user serviceable partswithin the protective housing and does not contain any access panelwith Safety Interlocks within the meaning of EN60825 section 4.3.

ii) Laser Radiation Emission Warning Lamp

It is to be assumed that for the purpose of safety, that if the laseremission lamp is illuminated, then laser radiation output from thesystem is possible. The laser emission lamp is located on the rearflange of the laser housing.If the emission lamp fails during operation of the system, then anemission lamp failure signal is provided for the systems integrator.See section 3 of this manual for details of the signal.

iii) Safety Shutter

A solenoid driven Safety Shutter is incorporated into all ROFIN SCsystems. This allows the user to block or dump the laser output beamwith a reflective mechanical blade. There are also two positionsensors for the Shutter Open and Shutter Closed positions for safetymonitoring.For details of the inputs and outputs required to operate the Shutterand monitor its position, see section 3 of this manual.

1.10 Additional Recommended Safety Precautions

In addition, the end user will also be required to add the following functionswithin a full system installation to meet the CDRH, EN60825, MachineryDirective EN89/392/EEC (EN60204 and EN292) and NFPA 79 safetystandards:


i) Emergency Shut Off Switch

It is recommended that the end user adds the facility for anemergency shut off switch for the laser equipment to the control panel.This switch should be of the red mushroom type with force make/forcebreak contacts and approved to the relevant electrical standards.

ii) Power On/Off Key Switch

It is also recommended that the end user adds the facility for a poweron/off key switch, such that the system can be switched off and thekey removed when the laser in not in operation.

iii) Manual Restart

It is a statutory requirement of 21 CFR 1040.10 that the laser outputshould not be restored automatically if the mains power fails or aninterlock is broken and then reset. The end user must provide for amanual restart mechanism under these circumstances.

1.11 Safety Warning Labels

In accordance with the requirements of EN60825, appropriate warninglabels are positioned in specific locations on the system to indicateconditions under which the user could be exposed to laser radiation. Inaddition, for systems supplied into the USA the product identificationlabel carries a statement on the requirements of 21 CFR 1040.10.

Except for the laser warning symbol, which has no written words, alllabels are written in the language specified by the user. Reproductionsof these labels and their positions are given in Appendix 1.

The applicable year for EN60825 is given in Appendix 1.


Section 2

General Description

906-0002-00 Rev 9 EN 2002 Rofin-Sinar UK Ltd General Description 2 - 1

Section 2 – General Description

2.0 Description of Operation of the ROFIN SC x10

The ROFIN SC x10 laser is a high-frequency excited, diffusion-cooled CO2

Slab Laser, designed for industrial use as a cutting, welding or markingtool.

Figure 2.0-1 shows the principle of operation of the Slab laser. A laser gasdischarge (active zone) (8) is established between the waveguidingelectrodes (9) by a radio frequency voltage (5, 10). The rear mirror (7) andoutput mirror (3) form the optical resonator. The laser beam (1) is producedwithin the resonator and is emitted through a window (2). Water (4, 6) isused to cool the electrodes.

Figure 2.0-1 Diffusion Cooled Slab Laser Layout

Due to the nature of the electrodes in a slab laser, the emitted laser beamdiverges at different rates in the x (free space) and the y (waveguide)directions. In order to make the beam round it is necessary to reshape theoutput beam using reflective correction optics. This can be achieved byusing single optical elements or a combination of cylindrical and sphericaloptics.


Depending on the configuration of the resonator, there may also bediffraction effects due to the output optic of the resonator. This can producesecondary lobes on the main output beam that need to be scraped orfiltered out. This is achieved by the use of a spatial filter.

After beam correction and spatial filtering the beam quality from a slablaser is ideal for any material processing operation that requires excellentmode quality and stability.

2.1 Laser Head Layout

Figure 2.1-1 shows the layout of the inside of the laser head housing. Afterexiting the Laser Tube (1), the laser beam is turned through 45 degrees bya plane turning mirror and is directed into the Beam Correction Module (2).

Inside the Beam Correction Module, a second plane turning mirror directsthe laser beam towards an angled spherical reflective element, whichcorrects the shape of the beam to make it round and also focuses thebeam into the spatial filter. The spherical mirror then deflects the beamtowards a plane mirror, which directs the beam into the Spatial FilterModule (3).

The Spatial Filter scrapes off any unwanted secondary lobes on the laserbeam. After exiting the Spatial Filter the beam enters the Safety ShutterModule (4). The Safety Shutter is used to block off any unwanted laseroutput using a rotary solenoid and a reflective blade. When in place, theSafety Shutter deflects the beam into a thermal dump.

Figure 2.1-1 Laser Head Layout (not to scale)

When the laser beam exits the Safety Shutter Module it is directed towardsthe Final Output Window (5). Depending on the specific requirements ofthe customer, this transmissive element can be either a plane window or alens.

The Laser Tube, Spatial Filter and Shutter Module are all water cooled andthe water flow is monitored by a Flow Switch (6).


2.2 Technical Specification

a) Laser Head Details

Laser Tube: Sealed Cavity, RF excited, DiffusionCooled, Slab Carbon Dioxide Laser

Excitation Frequency: 81 MHz

Tube Lifetime: > 10,000 hrs continuous running

Output Power: 100 WattsGuaranteed at 20oC coolant temperature 400µspulse width and 50% duty cycle. Allow 0.8% peroC power decline for coolant temperatures up to40oC.

Power Range: 5 – 100 Watts

Peak Power: 60 – 230 Watts

Power Stability: ± 7%

Pulsed Frequency: up to 10kHz (for full modulation depth)(higher frequencies for quasi-CW operation)

Pulse Energy: 5 – 230mJ

Pulse Rise/Fall Time: <45µs

External Dimensions(mm): 791.0(L) x 170.7(W) x 223.6(H)

Weight: 32.0kg

b) Laser Beam Characteristics

M2 (K) <1.2 (>0.8)

Beam Divergence: <2.5mrad (full angle)

Beam Ellipticity: <1.2:1

Beam Pointing Stability: <200µrad (half angle)

Beam Diameter (1/e2): 7.5 ± 0.5mmFor standard beam correction

Wavelength: 10.4 – 11.2µm

Polarisation: Linear (perpendicular to base of laser head)

c) RF Power Supply

Output Frequency: 81MHz

Output Power: 1kW average (2kW peak)

Input Voltage: 48V dc ± 1%

Input Current: 35 Amps (max RMS)


Input VA: 1.7kW max

External Dimensions (mm): 227.5(L) x 371.0(W) x 80.0(H)

Weight: 9.5kg

Figure 2.2-1 External Dimensions for the Laser Head(note: all dimensions in millimetres)


Figure 2.2-2 External Dimensions for the RF Power Supply(note: all dimensions in millimetres)

d) RF Cable (connects between the Laser Head Module and RF PowerSupply)

Cable Type: T-COM 600

Cross Sectional Diameter: 15mm

Static Minimum Bend Radius: 152mm – for a static cable

Dynamic Minimum Bend Radius: 400mm – for a moving cable

RF connector torque setting: 4Nm (2.95 ft-lb)

Standard Length: depends on customer order. Ingeneral, specific lengths are availablefrom approximately 1 to 10m.

For more information on RF cable properties and lengths refer to therelevant sales data sheet which is available from your localROFIN/Distributor sales office.

e) DC Power Supply

Output Voltage: 48V dc ± 1%

Output Current (max): 40A

Input Voltage: 200 - 240 V ac ± 10%single or bi-phase(must be connected to ground (earth))

Average Input Current (max):< 10A RMS

Peak Input Current (max): 16A


Typical Power Consumption: 2.0kW at 230V ac input(400s pulse width and 50% duty cycle)

Power Factor: >0.9

External Dimensions (mm): 371(W) x 270(D) x 160(H)

Weight: 13.5kg(15.0kg with mounting bracket 105-0077-00)(15.3kg with mounting bracket 105-0076-00)

Figure 2.2-3 External Dimensions for the DC Power Supply– show with bracket 105-0077-00

(note: all dimensions in millimetres)

f) Coolant Requirements

Heat Load: 2000 Watts max.

Coolant flow rate: 4 litres/min (minimum)

Coolant temperature: 19 – 25oC (± 1oC from coolant setting)

Coolant pressure: > 2.2 bar (32 psi)< 6.0 bar (88 psi)

In line filter: 100µm

Connections: 8mm OD tubingor barb fitting for 3/8” ID tubing

For more detailed information on the Cooling Water Specificationsee section 2.3 below.

g) Environmental Specification

Ambient temperature: +5 to +40oC (+41 to +104oF)

Storage temperature*: -10 to +70oC (+14 to +158oF)

Humidity: 10 to 85% relative humidity(non-condensing)

Altitude: < 3000m


* note that when storing or transporting the system, the water coolingpipes must be drained and blown out with compressed air to preventthe possibility of freezing and damage to the cooling circuit.

2.3 Cooling Water Specification

2.3.1 General Information

The inlet and outlet of the cooling water supply are clearly markedand must not be confused.

Only use pipe work that is impervious to light to reduce thepossibility of the formation of germs in the cooling watersystem.

To avoid condensation forming on the resonator and beam deliveryoptics, the temperature of the cooling water must be kept above thedew point.

2.3.2 Requirements and Additives

To ensure trouble-free operation of the laser and to preventcorrosion in the cooling circuit, the following requirements must becomplied with:

a) Quality of the Cooling Water

Use de-mineralised water whenever possible

Where de-mineralised water cannot be used, then the followingspecifications must be observed: If water is used with a hardness >0.1 mol/m3 (Ca++, Mg++), hardness stabilizers have to be added toprevent boiler scale deposit. However, the overall hardness must notexceed 2 mol/m3 (Ca++, Mg++)

Conductivity of the water with additives: < 1000 µS/cmChloride content of the water: < 50 mg/lpH value of the water: 7 - 8

b) Suspended Particles

To remove particulate contamination, a filter with a pore size of 100µm must be used. The filter should be located as close as possibleand in line with the cooling water inlet of the laser head.

c) Corrosion Inhibitor

To prevent corrosion of the cooling water circuit an appropriatecorrosion inhibitor must be added. Use a multi-metal corrosioninhibitor which will ensure effective protection against corrosion withstainless steel, copper, copper alloys and tin.

Pay particular attention to the instructions of the additivemanufacturer.

To prevent corrosion of the cooling water circuit, ROFIN recommendsthe use of the organic corrosion inhibitor VARIDOS LASERCOOLGLS manufactured by Messrs. Schilling-Chemie. VARIDOSLASERCOOL GLS works simultaneously as a bacteriostatic andwater hardness stabilizer. No additional substances are necessary.


The amount of VARIDOS LASERCOOL GLS to be used dependsupon the water quality:

1 % (10.0 kg/m3): de-mineralised water with reverse osmosis water.The water should not exceed a max. hardness of 2 mol/m3 (Ca++,Mg++)

Check both the concentration of VARIDOS LASERCOOL GLS withthe Schilling-Chemie test kit and the pH value as below:

• during initial installation• Approx 4 weeks from initial installation• Every 6 months thereafter

Carefully follow all the instructions provided by the manufacturerVARIDOS LASERCOOL GLS.

d) Germ Formation in the Cooling Water

The addition of VARICID T removes germs (algae and slime) from thecooling water and the cooling water circulation. The concentration ofVARICID T to be used is: 0.02 % - 0.05 % (0.2 - 0.5 kg/m3).

Please note:

• Make sure that the two additives (VARIDOS and VARICID) aremixed well with the cooling water and avoid over dosing!

• The cooling water must be changed after about 2 to 8 days.• Do not operate the laser continually with VARICID T in the cooling

water.

Pay attention to the instructions of the VARICID T manufacturer.

If VARIDOS LASERCOOL GLS is not available (e.g. in the USA), theinhibited anti-freeze Dowtherm SR-1 produced by Dow Chemical canbe used in a concentration of 20 % - 35 % by volume. Do not use lessthan 20 % by volume as the corrosion protection will not be effective.Concentrations of less than 10 % by volume can lead to the formationof highly corrosive glycol acids. If Dowtherm SR-1 is used, there is noneed to add biocides and hardness stabilizers.

If none of the above additives is available, a comparable product fromalternative suppliers can be considered provided that it meets therequired specification to protect against the formation of corrosion,boiler scale deposit and algae growth. We would strongly advise thatyou check with ROFIN prior to using alternative suppliers.

e) Frost Protection

If you wish to add anti-freeze to the cooling water, please note that theaddition of additives will affect the cooling characteristics of the waterand can reduce the effectiveness and efficiency of any chiller that isused. (Pay particular attention to the instructions of the anti-freezemanufacturer). In this case, please consult ROFIN. A combination ofanti-freeze and corrosion inhibitors may result in undesirable chemicalreactions. ROFIN recommends VARIDOS LASERCOOL GLS mixedwith pure ethylene glycol or the use of an inhibited anti-freeze basedon glycol. Please consult ROFIN for further information and advice onfrost protection.


2.4 Purge Gas

The ROFIN SC x10 Laser Head is sealed with a rubber gasket materialbetween the main structure and the external and internal system covers. Inrelatively clean environments, these seals will normally prevent dust, fumeand debris contamination of the optics and other parts inside the LaserHead.

If the internal or external beam delivery is contaminated with fume, watervapour or debris then these contaminants can absorb the laser energy andcause laser power fluctuations and steering of the laser beam.

Where contamination is suspected to be an issue, the system may requirea clean, dry and non-flammable purge gas supply for slight pressurisationof the Laser Head and/or the external beam delivery.

The purge gas can also be used to prevent condensation on the watercooled optics and other parts inside the Laser Head.

Note that when using a chiller for cooling the system, the watertemperature should be set to avoid condensation on pipe work, etc. ie. setabove dew point. Where this is not possible, then the purge gas can beused to prevent condensation inside the Laser Head.

The purge gas should be clean, dry and non-flammable eg. nitrogen, air,etc.

The purge gas should be supplied at a pressure of approximately 2 psi,and at a rate of approximately 1 litre per minute, using 6mm (or 1/4”)polyethylene tubing. The tubing connects directly to the ‘push in’ type fittingon the front panel of the Laser Head (where fitted).

Note that the ‘red’ blanking plug should not be removed from the‘push-in’ fitting where purge gas is not used. Removal of the plug willexpose a contamination path into the Laser Head.

The inlet to any air compressor system should be kept away from any fumeor debris contamination sources such as the laser processing zone or theexhaust port of any process gas/debris extraction unit.

Nitrogen Purge Gas Specification:

Purity: ≥ 4.6

Pressure: 1 to 3 psig (0.07 to 0.21 bar)

Flow Rate: 1 to 2 l/min

Air Purge Gas Specification:

Oil: ≤ 0.005 mg/m3

Water: ≤ 0.05 g/m3

Particles: ≤ 0.05 µm

Pressure: 1 to 3 psig (0.07 to 0.21 bar)

Flow Rate: 1 to 2 l/min


For more information on air purification options contact the localROFIN/Distributor sales department.

2.5 Fuses

There is only one user accessible fuse on the system which is on the DCPower Supply Module. This fuse is used to protect the small control boardin the laser head and the power supply for the laser’s pre-ioniser.

FAUX 500mA, anti-surge, 20 x 5mm

2.6 Enquiries

Every effort has been made to ensure that the information in this manual iscorrect, however components may be subject to design changes andupgrading, from time to time.

Please direct any questions or comments on this manual to Rofin-Sinar UKLtd, Customer Services Department, stating the part number and revisiongiven at the bottom of this page.

Immediate response, to any service enquiries, can be achieved bycontacting the relevant ROFIN/Distributor Service Office.

Always identify the instrument, by both the model number and the serialnumber, in all correspondence. This information is contained on the serialnumber panel, which is located on the rear flange of the Laser HeadHousing.

2.7 Warranty Information

ROFIN warrants that the product will be free from defects in material andworkmanship for twelve (12) months from delivery, if a warranty for theindividual product is not specified. All special warranty terms, eg. Lasertubes, etc., are contained in the ROFIN SC System warranty terms that arecurrent when the system is purchased. Copies of the ROFIN SC SystemWarranty Terms can be obtained from ROFIN. ROFIN only warrants to theoriginal purchaser and only at the original location.

Major sub systems manufactured by other firms but integrated into ROFINsystems are covered by the original manufacturer's warranty. In order tocomply with this warranty, all internal adjustments or hardware/softwaremodifications and servicing of the system must be made by a ROFINcertified field engineer or with the express written permission of Rofin-SinarUK Ltd., Service Department.

The warranty does not cover misuse of the equipment, negligence oraccidental damage. Please also note that damage due to laser beamback reflection, insufficient water cooling flow, corrosion, condensation orfreezing of water pipes is also not covered by the warranty for thesystem. Please consult the section on Installation and Operation (section3) for more information on these issues.

The liability of ROFIN, under valid warranty claims, is limited to repair orreplacement at ROFIN’s plant or purchaser's place of business (or, ifpracticable, a refund of the purchase price), all at the discretion of ROFINunless otherwise specified by law in the country where the equipment wassold.


ROFIN cannot accept liability for any other costs associated with down timedue to misadjustment, failure or servicing of the system.

2.8 Warranty Shipments, Returns and Adjustments

Warranty claims must be made promptly and must be received by ROFIN,during the applicable warranty period.

If it becomes necessary to return a product for repair and/or adjustment,authorisation from ROFIN for the return and instructions as to how andwhere these products should be shipped must be obtained from theService Department.

Service DepartmentRofin-Sinar UK Ltd.York WayWillerbyKingston upon HullHU10 6HDU.K.

Telephone: 44 (0) 1482 650088Fax: 44 (0) 1482 650022

Note: Drop the 0 for international calls (UK country code is 44)

2.9 Service and Repair

Servicing or calibration of the system can only be carried out by trainedROFIN Service Engineers, or customers who have undertaken and passeda ROFIN approved service training course. Details of training courses andservicing can be obtained from the local ROFIN/Distributor Service Office.


Section 3

Installation and Operation

906-0002-00 Rev 9 EN 2002 Rofin-Sinar UK Ltd Installation & Operation 3 - 1

Section 3 – Installation and Operation

3.0 Delivery Check

An itemised list of the ordered equipment is provided by ROFIN. Ondelivery, check the equipment against the list to ensure that all items arepresent. If any equipment is missing, inform ROFIN immediately.

Check the outside of the packing box for obvious signs of damage orchange of the shock or tilt labels.

If any damage to the packaging or change to the tilt or shock labels hasoccurred in transit, inform both ROFIN and the relevant shipping company,before taking any other action.

3.1 Unpacking

a) Cut the bands on the outside of the packing box. Open the box lid andremove the cables, spares kit and documents in the top section. Removetop section of the support packaging to reveal the Laser Head, the RFPower Supply and the DC Power Supply.

b) Check all the components for signs of damage. If any damage hasoccurred in transit, inform both ROFIN and the relevant shipping company,before taking any other action.

c) Carefully lift each component out of the packaging. Note that this mayrequire two people due to the weights involved.

d) Place each component on a clean, flat, dry surface in preparation forinstallation.

3.2 Installation

It is strongly recommended that any personnel who are involved with theinstallation, operation or maintenance of this laser equipment should firstread and fully understand the contents of this manual and in particularSection 1 on Safety Instructions and Precautions.

This is a Class 4 (Class IV) laser product. All precautions relevant tothis class of laser product should be strictly observed. Use ofcontrols or adjustments or performance of procedures other thanthose specified herein may result in hazardous radiation exposure.Strict compliance with the safety precautions set out and referred toin this manual and extreme care in use are essential to minimise thechance of accidental damage to the equipment or personal injury.ROFIN does not accept liability for any damage or injury howsoevercaused or arising.


The Laser Head, RF Power Supply and DC Power Supply should bemounted and bolted into the appropriate positions within the processingmachinery. See section 2 (Figure 2.3-1) of this manual for dimension andfixing information.

Figure 3.2-1 Recommended fixing for the Laser Head(note: only fix the laser head with three of the support feet)

The Laser Head should be secured using three of the five feet on thebase of the module, with the M8 bolts, large flat washers and springwashers. Assume an available thread depth of 15mm. See Figure 3.2-1 forthe recommended holes to use for fixing the Laser Head.


Do not use all five feet to bolt the unit down as this may distort orbend the base. This, in turn, may distort the optics alignment withinthe unit, which could lead to poor output mode and low power fromthe Laser Head.

3.2.1 Power Supply Installation

The power supplies for the ROFIN SC x10 are designed to bemounted within a housing or the control cabinet on the processingmachinery. There are three mechanical mounting options for the watercooled DC Power Supply.

The mounting frames described below have been designed forsecuring the DC Power Supply into a static material processingsystem. The frames are not designed to secure the Power Supplyduring transportation or movement of the system. Usesupplementary fixings or packing during shipment ortransportation.

a) The first option is a dedicated mounting frame (part no.105-0077-00 – see attached drawing) that is designed tobolt onto a plate or frame within the processing machinery.Referring to the drawing, the ‘C’ through holes aredesigned to take 6mm (or ¼”) threaded screws to attachthe mounting frame. Note that the latch levers on themounting frame should be visible from the front of PowerSupply.

When the frame has been bolted into the machine, the DCPower Supply can be placed over the M6 button headscrews located in holes ‘A’ and then slid forward andlatched into position (see drawing no. 900-0018-00 forreference). There should be a clearance of 100mm at thefront of the DC Power Supply for hose and cableconnections. The RF Power Supply should be mountednext to or above or below the DC Power Supply.

b) The second option is a combined mounting frame (part no.105-0076-00 see attached drawing) that can be used tocombine the RF and DC Power Supplies into one powersupply unit.

Referring to the drawing, the ‘C’ through holes aredesigned to take 6mm (or ¼”) threaded screws to attachthe mounting frame. Note that the latch levers on themounting frame should be visible from the front of PowerSupply.

When the frame has been bolted into the machine, the RFPower supply can be slid into the lower compartment andbolted into position using four M5 bolts and holes ’B’. TheDC power supply can be fitted into position as described ina) above. The attached drawing (900-0017-00) shows thefully assembled unit – note that there should be a clearanceof 100mm at the front of the Power Supply for hose andcable connections.


c) The third option for mounting the DC power supply is to usethe ‘A’ hole pattern as shown on drawing 105-0076-00 or105-0077-00.

The ‘A’ hole pattern can be repeated in the mountingposition on the machine and these holes should be drilledand tapped for M6 bolts. M6 button head screws shouldthen be screwed into the holes and locked into position with1.5mm clearance between the under side of the buttonhead and the face of the mounting plate.

The DC Power Supply can now be slid into position as withthe mounting frame described in a) above. A simple ‘L’bracket can be fitted at the front of the DC Power Supply tohold it in position.

3.2.2 Water Cooling

The Laser Head, RF Power Supply and DC Power Supply all requirewater cooling. The cooling specification is given in section 2.2f andsection 2.3. Use 8mm O.D. tubing – spare fittings are supplied in thespares kit. The recommended route for the water cooling is given inFigure 3.2.2-1.

To remove particulate contamination, a filter with a pore size of 100 µmmust be used. The filter should be located as close as possible and inline with the cooling water inlet of the laser head.

Figure 3.2.2-1 Water Coolant Flow Direction

The Laser Head, RF Power Supply and DC Power Supply have ‘WaterIn’ and ‘Water Out’ labels to indicate which connections to use – thewater flow is monitored by a direction sensitive flow switch locatedinside the Laser Head.

Note that where a water chiller is used, corrosion inhibitors should beused – more details are given in section 2.3.


Cooling water should be maintained at or above the minimum requiredflow rate to ensure sufficient cooling of the laser and its power supplies.In addition, the cooling water temperature should be adjusted andmaintained above the dew point to avoid condensation on the laseroptics and electronic parts.

The Laser Head and its Power Supplies should always be drained ofany water cooling fluid before shipping or transportation of the system.This will prevent possible freezing of the liquid and the consequentialdamage to the internal water pipes inside the Laser Head and thePower Supplies.

Damage due to insufficient water cooling flow, corrosion, condensationor freezing is not covered by the warranty for the laser system.

3.2.3 Purge Gas

For the purge gas requirements and specification please refer tosection 2.4 of this manual.

Where used, the purge gas should be supplied at a pressure ofapproximately 2 psig and at a rate of approximately 1 litre per minute,using 6mm (or 1/4”) polyethylene tubing. The tubing connects directly tothe ‘push in’ type fitting on the front panel of the Laser Head.

Note that the ‘red’ blanking plug should not be removed from the‘push-in’ fitting where purge air is not used. Removal of the plugwill expose a contamination path into the Laser Head.

For more information on air purification options contact the localROFIN/Distributor sales department.

3.3 Electrical Interfacing

The Laser Head, RF Power Supply and the DC Power Supply areconnected together by various cabling and connectors. The customer willneed to supply control signals to operate the laser. Details of the wiring andthe required signals are given in Figure 3.3-1.

When connecting the mains supply to the DC Power Supply ensure thatthe supply, fusing and any isolation switch meets the specification given insection 2.2 e) DC Power Supply. The DC Power Supply must also beconnected to earth.

The ROFIN SC range of products are Class 1 Appliances, as definedby 73/23/EEC Low Voltage Directive EN60950, and as such, must beconnected to an electrical earth (ground). For more information onelectrical safety, see section 1 (Safety) of this manual.

Drawing no. 005-0020-00 gives details of the mains wiring for single andbi-phase supplies. The DC Power Supply must be disconnected from themains supply before any attempt is made to remove the wiring accesscover or re-wire the unit for single or bi-phase operation. The drawing givesdetails of the position of the wiring access cover.

The water cooled DC Power Supply main covers should never beremoved as this may subject the user to hazardous energy levelsfrom energy storage capacitors inside the unit. There are no userserviceable parts inside the power supply.


Figure 3.3-1 Cabling Connection Diagram

The tables below give the connection details for the 9 way and 15 wayUser Interface Cables (Remote Connectors).

Essential signal inputs to operate the laser are:

15 Way D-TypePin 6 RF Power Supply EnablePins 4 & 5 Modulation Input – for laser output

For pulse width & duty cycle limitsSee section 3.4 below

9 Way D-TypePin 1 Shutter Solenoid Drive

to open the shutter

In addition, to meet the requirements of the Laser Radiation Safety StandardEN60825 and CDRH standards:

9 Way D-TypePins 2 & 3 Shutter Closed and Open Sensors

to continuously monitor the status of the Shutter

Pin 9 Emission Lamp OK signal

Emergency Shut Off Switch

It is recommended that the end user adds the facility for anemergency shut off switch to the control panel for the laserequipment. This switch should be of the red mushroom typewith force make/force break contacts and approved to therelevant electrical standards.

48V DC

+

_

DC POWER SUPPLY R.F. POWER SUPPLY

LASER HEAD

USER CONTROL

R.F. Cable

R.F. Cable

15 way D type cable

25 way D type cable

9 wayD type cable

Mains Power Input

Ground


Power On/Off Key Switch

It is also recommended that the end user adds the facility for apower on/off key switch, such that the system can be switchedoff and the key removed when the laser in not in operation.

Manual Restart

It is a statutory requirement of 21 CFR 1040.10 that the laseroutput should not be restored automatically if the mains powerfails or an interlock is broken and then reset. The end user mustprovide for a manual restart mechanism under thesecircumstances.

It is also recommended that the other inputs/outputs are usedfor complete fault monitoring eg. water flow, laser not struck,etc.

9 Way D-Type (Remote Connector) Wiring Details – to DC Power Supply

Pin 1 Shutter Solenoid Drive 5 - 24V dc (1mA) Input

Pin 2 Shutter Closed Sensor Open Collector Output(active low - 220Ω source impedance)

Pin 3 Shutter Open Sensor Open Collector Output(active low - 220Ω source impedance)

Pin 4 DC Power Supply OK Common Output (volt free relay contacts)

Pin 5 DC Power Supply OK Normally Closed Output(volt free relay contacts)

Pin 6 External Emission Indicator Open Collector Output(active low – 1KΩ source impedance)

Pin 7 Ground Connection

Pin 8 Ground Connection

Pin 9 Emission Lamp OK Open Collector Output(active low – 220Ω source impedance)

Figure 3.3-2 Open Collector Output

The circuit diagram for the ‘open collector’ outputs on the 9 way D-typeconnector is shown in figure 3.3-2. Item 1 is the source impedance and the‘active low’ state is achieved when the transistor (2) is turned on. Item 3 is theoutput pin.


15 Way D-Type (Remote Connector) Wiring Details – to RF Power Supply

Pin 1 VSWR Status Output Inverted Output: -ve RS 422See VSWR Status below

Pin 2 VSWR Status Output True Output: +ve RS 422See VSWR Status below

Pin 3 Over Modulation Output TTL Output: +5VSee Over Modulation below

Pin 4 Modulation Input Inverted Modulation Input: -ve RS 422

Pin 5 Modulation Input True Modulation Input: +ve RS422

Pin 6 RF Supply Enable + 5V to enable power supply(500 ms delay before supply turns on)

Pin 7 VSWR Forward Output 0 – 12 V output(see VSWR Forward & Reflected below)

Pin 8 VSWR Reflected Output 0 – 12 V output(see VSWR Forward & Reflected below)

Pins 9-15 are all Ground connections.

VSWR Status – Pin 1 & 2

The RF Power Supply is specified for operation into loads of up to 1.6:1VSWR (Voltage Standing Wave Ratio). However, internal monitoring of thereflected power protects the power supply from potentially dangerous loadconditions – eg. the laser will not strike. The trip point is set to a VSWR ofapproximately 2.5:1. Once tripped, the power supply average power islimited. The pulse width is limited to approximately 100µs and the dutycycle to 10%, with a self reset after 1ms. The state of the VSWR trip isoutput on pins 1 & 2 of the 15 way D type connector.

Over Modulation Status – Pin 3

The maximum duty cycle for the power supply is limited to 50% with amaximum pulsed on time of 1ms. If the modulation input for either of thesevalues is exceeded, then the RF output power will be limited to a safeoperating level. The state of the over modulation trip is output on pin 3 ofthe 15 way D type connector – see section 3.4 below for more information.

VSWR Forward and Reflected Power Monitor – Pins 7 & 8

The signals that drive the internal VSWR protection circuit are available onpins 7 and 8. Diode peak detectors used to demodulate the RF envelopepulses, together with the base emitter junction (of emitter follower buffers,driving pins 7 & 8) cause a drop of approximately 1.6V, from the RFenvelope.

RF Enable – Pin 6

A 5V dc level is required to enable the RF Power Supply. Note that afterthe signal is applied there is a 500ms delay before the power supply isenabled. This signal can be used to switch off the power supply,irrespective of the state of the modulation input eg. for safety interlocks. Innormal operation, the 5V dc level must be applied at least 500ms beforeany modulation input to ensure the required laser output. Note that therecan be no laser output, without the modulation input signals.


Suggested Circuit for Interfacing to Modulation Input

The differential signals used for driving the RF Power Supply can beachieved in a number of ways. The following is a suggested circuit forproducing the signals from a single square wave modulation input signal.Note that the circuit also supplies the 5V dc RF Enable signal.

The device used, DS8921 is an RS422 driver from NationalSemiconductor.

Figure 3.3-3 Modulation Input Circuit

3.3.1 DC Power Supply Lamps and Enable Switch

The front of the water cooled DC power supply is equipped with anumber of status lamps and a power supply enable switch. The functionof these is described below:

a) Enable Switch This switch can be used to enable ordisable the power supply. The ‘arrow’on the label indicates the direction toenable the Power Supply.

b) Supply OK lamp The Lamp is illuminated for mainssupply OK.

c) Output OK lamp The Lamp is illuminated when theoutput is between 44 and 52 Vdc.

d) Over Temp. lamp The Lamp will illuminate and the PowerSupply will be disabled when there isan over temperature fault on the PowerSupply.

e) PSU Enabled lamp The Lamp is illuminated when thepower supply is enabled ie. switch inenable position. If the switch is in theenable position, and the lamp is notilluminated then the Laser Head mayhave an interlock fault ie. water flow orover temperature problem.


3.3.2 RF Cable

The RF cable is manufactured to a matched cable length and cannot bealtered by the customer. A variety of different lengths are available toorder from ROFIN. If the standard length supplied is not suitable,please contact your nearest ROFIN Sales Office or Distributor withdetails of your preferred cable length.

As a general rule, cables are available in various lengths up toapproximately 10m. Longer cables can also be supplied at larger crosssectional diameter. More information on the RF Cable is given in thespecification section 2.2d or on the relevant RF Cable Data Sheetwhich is available from the local ROFIN/Distributor sales office. Notethat right angle RF connectors and/or converters are also available.

For applications where the RF cable remains static e.g. a fixedinstallation, the system integrator should ensure that any bends in thecable are not reduced below the minimum bend radius specified for theparticular RF cable used.

For applications where the Laser Head is moving e.g. roboticinstallation, the RF cable will have a finite lifetime which depends on thenumber of bends that the RF cable experiences and the smallest bendradius that is required. As the bend radius is reduced, the lifetime of thecable will become shorter. In these cases the system integrator shouldallow for RF cable replacement as a maintenance requirement.

When installing RF cables, the following general good practiceguidelines should be observed:

a) Use the shortest length of RF cable possibleb) Allow as large a bend radius on the cable as possible. Pay

close attention to the minimum bend radius specification for thecable

c) When the cable is connected to the RF Power Supply and theLaser Head, ensure that the connectors at either end of thecable are not over stressed i.e. do not try to bend the cable assoon as it exits the connector. Note that right angle RFconnectors and/or converters are available for the cable andmay help to alleviate this installation issue

d) Do not hard clamp the RF cable with ‘cable ties’ or otherclamping devices – allow free movement of the cable

e) Do not run the RF cable with other cables or water pipes – usea separate cable track

f) Always ensure that the RF connectors are tightened to therequired torque setting

g) In addition, for moving applications:i) Ensure that the RF cable can move freely over the

full range of motion of the system with no danger ofabrasion to the cable

ii) Where possible, allow the RF cable to move andbend freely to avoid repeated bending of the cablein the same position

iii) Ensure that the RF cable is oriented or positionedto avoid twisting of the cable along its axis


3.4 Additional Information on RF Pulse Width and Duty Cycle

The modulation input signals should be adjusted for the desired outputpower as shown in the Output Power vs Duty Cycle graph included with thewarranty documentation for the system.

The modulation signals should be adjusted to remain within the followinglimits:

Pulse width limits: 5µs to 400µs

Duty cycle: up to 50% maximum

Frequency: up to 100kHz

The maximum duty cycle for the power supply is limited to a predeterminedvalue (eg. 50%) with a maximum pulse on time (eg. 400µs). If themodulation input for either of these values is exceeded, then the RF outputpower will be limited to a safe operating level.

The following rules are applied:

a. any pulses > maximum allowed pulse width are truncated to 400µsb. any pulses < minimum allowed pulse width are blocked ie. there will

be no laser output for pulse widths that are less than the minimumallowed pulse width

c. any modulation frequency > maximum allowed frequency is blockedie. there will be no laser output for frequencies greater than themaximum allowed frequency

d. Any pulse that is > (1/f) x maximum duty cycle is truncated to (1/f) xmaximum duty cycleEg. working frequency = 25kHz, required pulse width = 25µs andmaximum duty cycle = 0.5 (ie. 50% duty). In this case the maximumpulse width allowed would be 20µs.

The Over Modulation Status is output on pin 3 of the 15 way D typeconnector on the RF Power Supply. If, due to any of the conditions statedabove, the modulation input is modified (ie. the laser output is modified),then the output on pin 3 is a logic low level ie. normal operation is a logichigh level.

3.5 Safety Shutter Mechanism

The Safety Shutter incorporated into the Laser Head Module can beoperated to block off the laser beam so that it is not transmitted through thefinal output window/lens of the system. The Shutter is intended to be usedas a safety device and has not been designed to operate as a processcontrol shutter.

When the Safety Shutter is operated a copper blade deflects the beam intoa water cooled beam dump inside the Laser Head Module. As the copperblade does absorb some of the energy from the laser beam, it can get hot ifthe laser is run continuously with the shutter in the closed position.

It is therefore not recommended to use the Safety Shutter as a processmanagement device to control the laser beam output from the system. Thistype of control can be achieved by using the ‘modulation’ and ‘enable’control signals described above.


As a general guide, the laser beam should not be run into the shutter formore than approximately two minutes at any one time followed by a 15minute cooling period.

3.6 Back Reflection of the Laser Beam

Laser light can be reflected back from a work piece or its supporting fixtureon material processing equipment. For example, if plastic sheet is cut onan aluminium backing plate, a large fraction of the laser beam power couldbe reflected from the supporting aluminium back into the beam deliveryand the laser head once the laser has cut through the plastic sheet. Theseback reflections can damage beam delivery optics and, even worse,destroy the cavity optics of the laser itself thereby rendering the laserinoperative.

Systems that are used to cut metals or other reflective materials or whichhave a metal supporting fixture for the work piece should be fitted with aback reflection optical isolator that prevents reflected beams from enteringthe laser head. Back reflection optical isolators are commercially availablefrom beam delivery component suppliers. Please contact the local ROFINoffice or its Distributor for more details on optical isolators.

Please note that back reflection damage is not covered by the warranty forthe laser system and as such, it is the responsibility of the systemintegrator to protect the laser from back reflection.


Section 4

Maintenance

906-0002-00 Rev 9 EN 2002 Rofin-Sinar UK Ltd Maintenance 4 - 1

Section 4 – Maintenance

4.0 General Information

The ROFIN SC range of systems have been designed to be lowmaintenance processing lasers. There is no requirement for internal routinemaintenance procedures.

The system's sealed construction and limited moving parts ensures troublefree and reliable operation.

One external item that will require periodic inspection and cleaning is thefinal optical element which is located on the output flange of the LaserHead Module. The frequency of inspection and cleaning will depend onhow the system is integrated into the customer’s machine and moreimportantly, how well the final optic is protected from dust andcontamination.

Always ensure that the system is switched off and isolated from the mainssupply before attempting any cleaning procedures.

4.1 Optical Surfaces

The information contained in this section is intended to be used as ageneral guideline for cleaning optical grade materials.

It is strongly recommended that a thorough understanding of thissection be attained before any optic cleaning or handling proceduresare attempted.

Peak performance and efficiency of optical systems is only possible whenthe surfaces of the optical components are absolutely free ofcontamination.

For example, a film of oily substance or specks of dust can substantiallyreduce the performance of the system. In most cases this will be seen as agradual deterioration in the intensity of the beam on the target material ie.slower cutting speed.

Optical surfaces can be irreparably damaged by seemingly harmlessdebris or lint.

This section is designed to introduce correct and safe methods for thecleaning of optical components.


4.2 Output Window

The only externally exposed optical surface on the ROFIN SC system isthe output window or lens.

The most common sources of surface contaminants are fingerprints andairborne contaminants (dust, lint, smoke, etc.).

If allowed to remain on optical surfaces, such contaminants will causeabsorption and light scattering and in extreme cases this may permanentlydamage the optic and its coatings.

If removed improperly, they can cause permanent damage.

Switch off the laser system and isolate from the mains supply.

Remove any beam delivery or beam shroud which is attached to the frontflange of the Laser Head and inspect the output optic. Clean if necessary,observing the methods described in the following sections 4.3 and 4.4.

Leave the optic in its holder during the cleaning process.

4.3 Optics Cleaning Materials

Lens tissue (first quality)

Tissues (non perfumed for rough work, wiping hands, etc).

Disposable lint-free gloves.

Solvents (highest purity, preferably anhydrous):

Methanol, Ethanol, Isopropyl Alcohol

Photographic blower brush

Containers of various sizes, stainless steel or glass, of volume appropriateto the objects being cleaned.

4.4 Cleaning Optical Surfaces

Hands should be thoroughly washed to remove all oils, perspiration andgrit. The hands should then be rinsed free of soap. Lint free gloves can beused for added protection of the optic.

If there is visible dust, lint or other solid matter on the optics surface, gentlyblow it off with a photographic blower brush.

Coated optics require careful handling, even the type labelled 'hard-coated'.

If the surfaces are not badly contaminated, cleaning can be done fairlyeasily, a fresh sheet of lens tissues folded to form a pad several layersthick. Its size will be a compromise between fully covering the diameter orwidth of the surface and being too large to clean evenly.

Enough optical grade solution to just dampen the pad should be appliedwith a medicine type dropper.


The pad should then be drawn across the surface in one smooth stroke,using very light pressure. The soiled pad must then be discarded.

Repeat as necessary, using a clean pad for each stroke. Using new padseach time will minimise the possibility of scratching the optical coating.

When the optic is clean, replace the optic and lens shroud and reconnectthe compressed air.

Where severe contamination has permanently damaged the optic, replacewith a new component of the correct specification.

4.5 Purge Gas Supply

A purge gas supply may be required where there is a possibility ofcontamination of the optics and other parts inside the Laser Head when thesystem is operated in humid or very dusty environments. Contamination ofthe optics will result in optics damage and a reduction in the optical outputpower from the Laser Head.

If the internal or external beam delivery is contaminated with fume, watervapour or debris then these contaminants can absorb the laser energy andcause laser power fluctuations and steering of the laser beam.

To prevent this contamination, a clean, dry and non-flammable gassupply is recommended in humid or very dusty environments to provideslight positive pressure on inside the Laser Head. The purge gasrequirements and recommended specification are given in section 2.4 ofthis manual.

Refer to the relevant manufacturer’s instructions for maintenance of the purgegas supply and any associated equipment.

4.6 General Cleaning

Always ensure that the system is switched off and isolated from the mainssupply before attempting any cleaning procedures.

The external surfaces of the system can be cleaned with a mild detergent.It is advisable to use a damp cloth to facilitate the cleaning of the externalcabinets, etc.

Take care not to allow entry of water into any of the electrical cabinets.


Appendix 1

Safety Labels

906-0002-00 Rev 9 EN 2002 Rofin-Sinar UK Ltd Safety Labels A1 - 1

Appendix 1 – Safety Labels

ROFIN SC Series Safety Labels

As required by EN60825, appropriate warning labels have been positionedin specific locations on the system to indicate conditions under which theuser could be exposed to laser radiation. The following gives details of thoselabels, their part numbers and their specific positions on the system.

A1.1 Laser Hazard Symbol – 905-0018-00

The Laser Hazard symbol is intended to warn the operator of the possibilityof hazardous laser radiation.

A1.2 Class 4 Laser Warning Label - 905-0011-00


A1.3 Laser Technical Data Label – 905-0019-00

A1.4 Laser Aperture Label – 905-0013-00

A1.5 Non Interlocked Panel Label – 905-0014-00(label used inside the Laser Head Module)

A1.6 Cover Warning Label – 905-0015-00

A1.7 230V AC Warning Label – 905-0016-00


A1.8 Voltage Hazard Label – 905-0017-00

A1.9 Product Identification Label – 905-0004-00

A1.10 Emission Warning Lamp – see A1.11 for position

A1.11 Position of Labels on Laser Head Module(the other labels are positioned either inside the Laser Head Module or on the

Power Supplies)


Appendix 2

Additional Information

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____________________________________________________________________________________________________________906-0012-00 Rev 1 1999 Rofin-Sinar UK Ltd Rofin SC System

ROFIN SC System

TTL – RS422 Converter Mk11 (Part No. 009-0020-00)

PLEASE READ AND ENSURE YOU UNDERSTAND THISDOCUMENT THOROUGHLY PRIOR TO USING THE

EQUIPMENT

1. Overview

The RF Power Supply used to drive the Laser Head is fitted with aspecialised interface. This is a 15 pin male “D” type connector and carriesall the signals required to drive the laser and monitor the status of the RFPower Supply. In order to provide maximum immunity from ambient noisesome of these signals are in what is known as a differential two wireformat. The purpose of the converter is to allow the user to be able tocontrol the drive to the laser by means of simple TTL level 5V signals.

The converter is shipped with two cables:-

Part No. 091-0103-00 has a 15 pin Female “D” type connector whichattaches to the RF Power Supply. At the other end of the cable the 15 pinMale end mates with the female connector on the converter.

Part No.091-0104-00 has a 15 pin Female “D” type connector fitted to oneend but is not terminated at the other. This is a screened 12-core cable andis intended to be connected to the user’s pulse generation and monitoringcircuitry.

2. Minimum Signal Requirements

In order to drive the Laser, the following signals MUST be supplied by theuser as a minimum requirement :-

5V supply for the converter

The converter needs powering from a 5v dc stabilised power supply.

Laser modulation signal

This signal is the user-generated waveform required to drive the Laser. Itneeds to be a TTL level signal and is active high. The signal must meet therequirements of the RF Power Supply for pulse width and duty cycleotherwise it will be over-ridden by the monitoring electronics within the RFPower Supply itself. For further details on this see the relevant OperatingManual.

RF POWERSUPPLY

TTL – 422CONVERTER

091-0103-00 091-0104-00


Signal ground

There are four connections provided. As they are all internally connectedwithin the converter, the user is free to select whichever they wish whendriving the Laser.

Chassis ground

This connects to the chassis of the converter and to the chassis of the RFPower Supply.

Pin Number Wire Colour Function1 RED Output VSWR Status (inverted output)2 BLUE Output VSWR Status (normal output)3 GREEN Output Over-modulation output4 YELLOW Input Modulation signal for laser5 WHITE Input 5v supply to converter at approximately 50 mA6 BLACK Input: User supplied RF Enable input signal TTL level

(Active High)7 BROWN Output RF Forward power8 VIOLET Output RF Reflected power9 ORANGE Ground Signal ground10 PINK Ground Signal ground11 TURQUOISE Ground Signal ground12 GREY Ground Signal ground13 Not Connected14 Not Connected15 CABLE SCREEN Ground Chassis ground of RF Power Supply

Wiring Details (15 pin male on converter unit)

IMPORTANT

It must be understood that if the system is powered up and the minimum signalsas detailed previously are supplied, Laser Radiation will be produced. Allsafety procedures as detailed in the relevant Operator's Manual must beimplemented and followed.

This is a Class 4 (Class IV) laser product. All precautions relevant to thisclass of laser product should be strictly observed. Use of controls oradjustments or performance of procedures other than those specifiedherein may result in hazardous radiation exposure. Strict compliance withthe safety precautions set out and referred to in this manual and extremecare in use are essential to minimise the chance of accidental damage tothe equipment or personal injury. Rofin-Sinar does not accept liability forany damage or injury howsoever caused or arising


3. Additional Signals

Inside the converter unit is a two-position jumper. The Factory setting is in theON position. If switched to the OFF position, an RF ENABLE signal must alsobe provided by the user. This Signal (PIN 6 on 15 Way D-Type) is also TTLlevel and is Active high. Without this signal there can be no Laser emission. Theuser may wish to take advantage of this as a further safety feature.

RF ENABLE ON/OFF Switch

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información sobre el co2

Documents

rofinsinar uk

safety instructions

safety labelsappendix

rofin sc x10section

equipment safety standards

rofin sc x10this manual

safety warning labels

safety shutter mechanism