Información sobre el CO2

Operating Manual

ROFIN SC x10 OEM CO2 Slab Laser

906-0002-00 Rev 9 EN

 2002 Rofin-Sinar UK Ltd.

ROFIN SC x10

This manual is copyrighted with all rights reserved. Under copyright laws, this manual may not be copied in whole or part or reproduced in any other media without the express permission of Rofin-Sinar UK Ltd. Permitted copies must carry 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 given in this document is accurate, the information, figures, illustrations, tables, specifications and schematics contained herein are subject to change without notice. The most recent additions and supplementary information is given in the Additional Information Section – Appendix 2.

Rofin-Sinar UK Ltd. York Way Willerby Kingston upon Hull U.K. HU10 6HD Tel: Fax:

44 (0) 1482 650088 44 (0) 1482 650022

August 2002

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ROFIN SC x10

Contents Page Section 1

Safety Instructions and Precautions 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 1.11

Section 2

2.4 2.5 2.6 2.7 2.8 2.9

Description of Operation of ROFIN SC x10 Laser Head Layout Technical Specification Cooling Water Specification 2.3.1 General Information 2.3.2 Requirements and Additives Purge Gas Fuses Enquiries Warranty Information Warranty Shipments, Returns and Adjustments Service and Repair

2-1 2-2 2-3 2-7 2-7 2-7 2-9 2-10 2-10 2-10 2-11 2-11

Installation and Operation 3.0 3.1 3.2

3.3 3.4 3.5 3.6 906-0002-00 Rev 9 EN

1-1 1-1 1-2 1-3 1-3 1-3 1-4 1-6 1-6 1-7 1-7 1-8

General Description 2.0 2.1 2.2 2.3

Section 3

General Information Laser Radiation Safety Standards Intended Use for the Laser Equipment Equipment Safety Standards Training Recommended Administrative Precautions Laser Radiation Hazards Fume and Vapour Hazard Electrical Hazard Safety Precautions Additional Recommended Safety Precautions Safety Warning Labels

Delivery Check Unpacking Installation 3.2.1 Power Supply Installation 3.2.2 Water Cooling 3.2.3 Purge Gas Electrical Interfacing 3.3.1 DC Power Supply Lamps & Enable Switch 3.3.2 RF Cable Additional Info on RF Pulse Width & Duty Cycle Safety Shutter Mechanism Back Reflection of the Laser Beam

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3-1 3-1 3-1 3-3 3-4 3-5 3-5 3-9 3-10 3-11 3-11 3-12

SC x10 Contents

Section 4

Maintenance 4.0 4.1 4.2 4.3 4.4 4.5 4.6

General Information Optical Surfaces Output Window Optics Cleaning Materials Cleaning Optical Surfaces Purge Gas Supply General Cleaning

4-1 4-1 4-2 4-2 4-2 4-3 4-3

Appendix 1 Safety Labels Appendix 2 Additional Information

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SC x10 Contents

Section 1

Safety Instructions and Precautions

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ROFIN SC x10

Section 1 – Safety Instructions and Precautions 1.0 General Information It is strongly recommended that any personnel who are involved with the installation, operation or maintenance of this laser equipment should first read and fully understand the contents of this manual and in particular Section 1 on Safety Instructions and Precautions. If there are any questions or doubts on any of the safety aspects of the equipment, then do not hesitate to contact your nearest ROFIN sales or service office or distributor for advice before proceeding. The installation, operation, maintenance and repair of this laser equipment must only be carried out by ROFIN service personnel or trained staff who have received correct instruction concerning the hazards associated with this particular equipment. Take extensive precautions to prevent exposure of laser energy to the eye and skin from either direct or diffusely reflected laser beams. In addition, precautions must be taken to prevent the hazards of fire, electrical injury and pollution. The information and precautions given in the following sections are extensive but may not be complete. Laser users are advised to supplement this information with information regarding current technological advances as they become available. All safety critical instructions contained within this documentation are framed with a border and printed in bold italic typeface. In addition, the safety warning symbol shown on the left indicates that care should be taken when working with or on the laser equipment. Strict compliance with the safety precautions set out and referred to in this manual and extreme care in use are essential to minimise the chance of accidental damage to the equipment or personal injury. ROFIN does not accept liability for any damage or injury howsoever caused or arising. The symbol given on the left is also used on the equipment and indicates that the user should refer to the Equipment Operator’s Manual for more information on the safe operation or installation of the equipment. 1.1 Laser Radiation Safety Standards a)

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The European standard for the Radiation Safety of Laser Products is EN60825. The ROFIN SC range of carbon dioxide lasers are classified as Class 4 lasers and as such, the user should appoint a Laser Safety Officer and should be familiar with the content of EN60825.  2002 Rofin-Sinar UK Ltd

Safety

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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 subsequent sale of laser equipment are governed by the Centre for Devices and Radiological Health (CDRH). The laser safety requirements are covered in subchapter J of the Radiation Standards, 21 CFR. This laser product is designated solely for use as a component laser and therefore does not meet all the requirements of 21 CFR 1040.10. In the United States it is the responsibility of the buyer of these components to ensure that the final system sold to an end user complies with all the relevant laser safety requirements prior to the sale of that system. The buyer is also required to provide a system report filing to CDRH before the system is shipped to an end user.

d)

The average output power, peak power per pulse, the pulsed frequency, the wavelength of the radiation and other specifications for the particular carbon dioxide (CO2) laser covered by this manual can be found in the Technical Specification in Section 2.

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

1.2 Intended Use for the Laser Equipment The CO2 laser equipment described in this documentation is intended to be used for processing materials in an industrial environment. The laser is a source 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 laser system into which it is incorporated (e.g. cutting, welding, marking, surface working) as well as by the manufacturer’s instructions. The use of the laser equipment for applications other than the intended one constitutes misuse and the laser manufacturer, ROFIN, does not accept liability for any damage or injury howsoever caused or arising. In addition, ROFIN does not accept liability for any damage or injury howsoever caused or arising where the laser equipment has been modified without the prior written permission of Rofin-Sinar UK Ltd. Do not use the laser beam to heat foodstuffs as this may cause injury and can produce poisonous substances, fumes or vapours. Work on organic materials, such as wood or plastics may also be dangerous. Before working on any material with a laser beam, ensure that all personnel are familiar with the applicable safety precautions.

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Safety 1 - 2

1.3 Equipment Safety Standards The ROFIN SC range of CO2 laser systems are manufactured to the following Safety Standards: I)

The United States guidelines for the manufacture and subsequent sale of laser equipment are governed by the Centre for Devices and Radiological Health (CDRH). The laser safety requirements are covered in subchapter J of the Radiation Standards, 21 CFR. This laser product is designated solely for use as a component laser and therefore does not meet all the requirements of 21 CFR 1040.10. In the United States it is the responsibility of the buyer of these components to ensure that the final system sold to an end user complies with all the relevant laser safety requirements prior to the sale of that system. The buyer is also required to provide a system report filing to CDRH before the system is shipped to an end user.

II)

EN60825 European Standard for the Radiation Safety of Laser Products – Class 4 laser equipment

III) 73/23/EEC Low Voltage Directive EN60950 – Class 1 Appliance, must be connected to an electrical earth. Note that when the laser equipment is incorporated into other machinery, eg. a laser cutting system, then the full machinery installation may have to conform to EN60204 and/or EN292 (Machinery Directive EN89/392/EEC) and any other applicable standards. iv)

89/336/EEC Electro-Magnetic Compatibility Directive EN50082-2 – EMC immunity for industrial environments EN55011 – 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 the installation, operation and maintenance of the ROFIN SC product range. 1.5 Recommended Administrative Precautions i)

Ensure that operators are given regular safety instruction (at least once per year) and have read and understood this manual. ii) Ensure that operators have a copy of this safety information for easy reference. iii) Observe all accident prevention regulations that are in force in the work place. iv) Attach the correct hazard warning plates and labels to the laser equipment. v) Ensure that untrained or unauthorised personnel do not have access to the laser system. vi) Ensure that the ‘laser designated area’ is properly marked out and labelled. vii) Combustible or flammable gases, liquids or solids can ignite when irradiated with the laser beam. Remove any such materials from the laser designated area. viii) Some materials, such as metals or plastics, can give off toxic decomposition products when processed using the laser beam. Investigate the hazards associated with the materials that are being processed. Professional bodies can provide this information. ix) Ensure that all objects which may accidentally reflect the laser beam are removed from the laser designated area.

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x)

Always check the safety of the laser system before beginning any work, especially any safety shutters, beam delivery devices and nozzle systems.

1.6 Laser Radiation Hazards The wavelength of the output beam from a Carbon Dioxide (CO2) laser can be in the range 9.3µm to 11.5 µm. The wavelength range is invisible to the human eye and is in the infra-red part of the electromagnetic spectrum. The ROFIN SC CO2 laser emits a high-power beam infra-red radiation which is invisible, but behaves in most other respects like visible light. The beam is powerful enough, when focused, to cut materials such as plastic, 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 first absorbent material it contacts. CO2 laser radiation can be reflected from smooth metallic surfaces, even though they may be blackened. CO2 laser radiation can be focused with lenses in order to be useful for cutting or marking applications. Beyond the focal point the laser beam rapidly diverges, causing dissipation of the energy density or intensity of the beam. The Laser Aperture is clearly marked with a label stating 'LASER APERTURE'. Avoid eye or skin exposure to direct or scattered laser radiation. The ROFIN SC laser output beam characteristics are described in section 2 (Technical Specification) of this manual. i) Eye Protection If laser radiation enters the eye, even after reflection from a metal object, it can burn the surface of the eye causing permanent damage. Because the CO2 laser beam is highly absorbed by water, the cornea and the sclera are the predominant ocular structures at risk for injury and may suffer irreversible damage and scarring as a result of direct or indirect exposure to the CO2 laser beam. Severity of injury to these structures depends on how concentrated or diffuse the beam is and the length of exposure time. PERMANENT EYE DAMAGE MAY RESULT IF LASER RADIATION IS ALLOWED TO ENTER THE EYE EITHER DIRECTLY OR BY REFLECTION FROM A METALLIC SURFACE DURING PROCEDURES INVOLVING ACCESS TO THE LASER OUTPUT. ALL PERSONNEL MUST WEAR SAFETY SPECTACLES SUITABLE FOR USE WITH CARBON DIOXIDE LASERS WHEN THE LASER IS IN A CLASS 4 OPERATIONAL STATE. PERSONNEL NOT SO PROTECTED MUST BE EXCLUDED FROM THE AREA OR ROOM CONTAINING THE LASER.

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Safety 1 - 4

The following precautions are pertinent for protection from 9.3 - 11.5 micron (µm) wavelength CO2 laser energy only. 1. As a precaution against accidental CO2 laser exposure to the output beam or its reflection, anyone within the area should wear the appropriate protective goggles with side shields. 2. The appropriate plastic prescription glasses may be substituted for protective goggles at the individual's own risk since they do not have side shield protection. (Glass can be shattered by a high power density laser beam) 3. Contact lenses and reading (half) glasses do not provide sufficient protection. 4. Glass windows normally provide sufficient protection from CO2 laser energy, to any outside 'passer-by'. 5. Never look directly into the carbon dioxide laser light source or scattered laser light from reflective surfaces. 6. The working area must be shielded with metal, acrylic or polycarbonate, and should incorporate a safety interlocked door. 7. The door interlock should be used to automatically disable the laser when the guard door is opened. In addition, the door interlock circuit should be designed or configured such that operator intervention is required before the interlock circuit is remade, when the guard door is opened and then closed by the operator. ii) Skin Protection If laser radiation is exposed to the skin it can burn and cut the flesh causing temporary or permanent damage. The following precautions are pertinent for protection from 9.3 - 11.5 micron (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 to absorb the energy. 3. Metallic objects will reflect the CO2 laser beam. Blackened metallic objects may also be reflective to the laser beam. Objects that are brushed or dimpled will diffuse the laser beam. Items that absorb the laser beam will become hot. 4. In the event of an emergency (laser or non-laser related), the laser should be shutdown immediately. Some criteria for emergency shutdown include the following: • • • • •

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

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Safety

1-5

iii) Protection against Fire Combustible objects which are placed in the laser beam path can be set on fire. 1. A CO2 laser can ignite most non metallic materials. 2. Never operate the laser in the presence of flammable gases or liquids. 3. Never operate the laser in the presence of explosive materials. 4. Ensure the laser system is installed with the correct level of safety interlocking. 1.7 Fume and Vapour Hazard Laser induced reactions can release hazardous particulate and gaseous matter. These by-products may be poisonous. Before working on any material with the laser beam, ensure that all the applicable safety standards are being followed. The laser beam provides the user with a ‘hot’ beam that can be used as a controlled 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 these materials can emit hazardous fumes in the form of gases or particulate matter eg. polyvinyl chloride (PVC) and polycarbonate. Standard materials handbooks or the manufacturer of the material should be contacted before attempting to process such materials with a laser. In addition, fume extraction is recommended for removing the smoke plume. Specialist filters can also be used to filter the fume in the workplace. Filters must be cleaned and/or replaced in accordance with safety regulations to prevent environmental pollution. 1. Do not attempt to process a material with a laser beam unless the heating characteristics of the material have been fully investigated and understood. 2. Provide a method for safely shielding and extracting the fume produced 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. The chemical heat reaction in combination with the humidity in the air will produce hydrochloric acid. Hydrochloric acid is hazardous to the operator and the laser system. 1.8 Electrical Hazard Any installation, service or repair work must be undertaken by qualified ROFIN personnel or by skilled engineers after consultation with the relevant local ROFIN Service Department. If in doubt contact the Service Department at the phone number given at the beginning of this manual.

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Safety 1 - 6

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 correction optics may allow leakage of laser light. 2. The area around the laser and its power supplies should be kept dry. 3. Never operate the laser if there is any sign of leakage of water from 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 maintenance according to ROFIN’s recommendations, as detailed in section 4 of this manual. 1.9 Safety Precautions The ROFIN SC range of lasers incorporate various safety features as required by EN60825 and CDRH radiation safety standards. The end user will be required to utilise these functions within a full system installation to meet these safety standards. These are as follows: i) Safety Interlocks No sections of the laser’s protective housing can be easily opened without special tools. The CO2 laser has no user serviceable parts within the protective housing and does not contain any access panel with 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 laser emission lamp is illuminated, then laser radiation output from the system is possible. The laser emission lamp is located on the rear flange of the laser housing. If the emission lamp fails during operation of the system, then an emission 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 SC systems. This allows the user to block or dump the laser output beam with a reflective mechanical blade. There are also two position sensors for the Shutter Open and Shutter Closed positions for safety monitoring. For details of the inputs and outputs required to operate the Shutter and 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 functions within a full system installation to meet the CDRH, EN60825, Machinery Directive EN89/392/EEC (EN60204 and EN292) and NFPA 79 safety standards:

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i)

Emergency Shut Off Switch

It is recommended that the end user adds the facility for an emergency shut off switch for the laser equipment to the control panel. This switch should be of the red mushroom type with force make/force break 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 power on/off key switch, such that the system can be switched off and the key removed when the laser in not in operation. iii)

Manual Restart

It is a statutory requirement of 21 CFR 1040.10 that the laser output should not be restored automatically if the mains power fails or an interlock is broken and then reset. The end user must provide for a manual restart mechanism under these circumstances. 1.11 Safety Warning Labels In accordance with the requirements of EN60825, appropriate warning labels are positioned in specific locations on the system to indicate conditions under which the user could be exposed to laser radiation. In addition, for systems supplied into the USA the product identification label carries a statement on the requirements of 21 CFR 1040.10. Except for the laser warning symbol, which has no written words, all labels are written in the language specified by the user. Reproductions of these labels and their positions are given in Appendix 1. The applicable year for EN60825 is given in Appendix 1.

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Safety 1 - 8

Section 2

General Description

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ROFIN SC x10

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 marking tool. Figure 2.0-1 shows the principle of operation of the Slab laser. A laser gas discharge (active zone) (8) is established between the waveguiding electrodes (9) by a radio frequency voltage (5, 10). The rear mirror (7) and output mirror (3) form the optical resonator. The laser beam (1) is produced within the resonator and is emitted through a window (2). Water (4, 6) is used 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 beam diverges 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 the output beam using reflective correction optics. This can be achieved by using single optical elements or a combination of cylindrical and spherical optics.

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Depending on the configuration of the resonator, there may also be diffraction effects due to the output optic of the resonator. This can produce secondary lobes on the main output beam that need to be scraped or filtered out. This is achieved by the use of a spatial filter. After beam correction and spatial filtering the beam quality from a slab laser is ideal for any material processing operation that requires excellent mode quality and stability. 2.1 Laser Head Layout Figure 2.1-1 shows the layout of the inside of the laser head housing. After exiting the Laser Tube (1), the laser beam is turned through 45 degrees by a plane turning mirror and is directed into the Beam Correction Module (2). Inside the Beam Correction Module, a second plane turning mirror directs the laser beam towards an angled spherical reflective element, which corrects the shape of the beam to make it round and also focuses the beam into the spatial filter. The spherical mirror then deflects the beam towards a plane mirror, which directs the beam into the Spatial Filter Module (3). The Spatial Filter scrapes off any unwanted secondary lobes on the laser beam. After exiting the Spatial Filter the beam enters the Safety Shutter Module (4). The Safety Shutter is used to block off any unwanted laser output using a rotary solenoid and a reflective blade. When in place, the Safety 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 towards the Final Output Window (5). Depending on the specific requirements of the customer, this transmissive element can be either a plane window or a lens. The Laser Tube, Spatial Filter and Shutter Module are all water cooled and the water flow is monitored by a Flow Switch (6).

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2.2 Technical Specification a) Laser Head Details Laser Tube:

Sealed Cavity, RF excited, Diffusion Cooled, Slab Carbon Dioxide Laser

Excitation Frequency:

81 MHz

Tube Lifetime:

> 10,000 hrs continuous running

Output Power:

100 Watts o

Guaranteed at 20 C coolant temperature 400µs pulse width and 50% duty cycle. Allow 0.8% per o C power decline for coolant temperatures up to o 40 C.

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:

maximum allowed pulse width are truncated to 400µs b. any pulses < minimum allowed pulse width are blocked ie. there will be no laser output for pulse widths that are less than the minimum allowed pulse width c. any modulation frequency > maximum allowed frequency is blocked ie. there will be no laser output for frequencies greater than the maximum allowed frequency d. Any pulse that is > (1/f) x maximum duty cycle is truncated to (1/f) x maximum duty cycle Eg. working frequency = 25kHz, required pulse width = 25µs and maximum duty cycle = 0.5 (ie. 50% duty). In this case the maximum pulse width allowed would be 20µs. The Over Modulation Status is output on pin 3 of the 15 way D type connector on the RF Power Supply. If, due to any of the conditions stated above, 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 logic high level. 3.5 Safety Shutter Mechanism The Safety Shutter incorporated into the Laser Head Module can be operated to block off the laser beam so that it is not transmitted through the final output window/lens of the system. The Shutter is intended to be used as a safety device and has not been designed to operate as a process control shutter. When the Safety Shutter is operated a copper blade deflects the beam into a water cooled beam dump inside the Laser Head Module. As the copper blade does absorb some of the energy from the laser beam, it can get hot if the laser is run continuously with the shutter in the closed position. It is therefore not recommended to use the Safety Shutter as a process management device to control the laser beam output from the system. This type of control can be achieved by using the ‘modulation’ and ‘enable’ control signals described above.

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As a general guide, the laser beam should not be run into the shutter for more than approximately two minutes at any one time followed by a 15 minute cooling period. 3.6 Back Reflection of the Laser Beam Laser light can be reflected back from a work piece or its supporting fixture on material processing equipment. For example, if plastic sheet is cut on an aluminium backing plate, a large fraction of the laser beam power could be reflected from the supporting aluminium back into the beam delivery and the laser head once the laser has cut through the plastic sheet. These back reflections can damage beam delivery optics and, even worse, destroy the cavity optics of the laser itself thereby rendering the laser inoperative. Systems that are used to cut metals or other reflective materials or which have a metal supporting fixture for the work piece should be fitted with a back reflection optical isolator that prevents reflected beams from entering the laser head. Back reflection optical isolators are commercially available from beam delivery component suppliers. Please contact the local ROFIN office or its Distributor for more details on optical isolators. Please note that back reflection damage is not covered by the warranty for the laser system and as such, it is the responsibility of the system integrator to protect the laser from back reflection.

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Section 4

Maintenance

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ROFIN SC x10

Section 4 – Maintenance 4.0 General Information The ROFIN SC range of systems have been designed to be low maintenance processing lasers. There is no requirement for internal routine maintenance procedures. The system's sealed construction and limited moving parts ensures trouble free and reliable operation. One external item that will require periodic inspection and cleaning is the final optical element which is located on the output flange of the Laser Head Module. The frequency of inspection and cleaning will depend on how the system is integrated into the customer’s machine and more importantly, how well the final optic is protected from dust and contamination. Always ensure that the system is switched off and isolated from the mains supply before attempting any cleaning procedures. 4.1 Optical Surfaces The information contained in this section is intended to be used as a general guideline for cleaning optical grade materials. It is strongly recommended that a thorough understanding of this section be attained before any optic cleaning or handling procedures are attempted. Peak performance and efficiency of optical systems is only possible when the surfaces of the optical components are absolutely free of contamination. For example, a film of oily substance or specks of dust can substantially reduce the performance of the system. In most cases this will be seen as a gradual deterioration in the intensity of the beam on the target material ie. slower cutting speed. Optical surfaces can be irreparably damaged by seemingly harmless debris or lint. This section is designed to introduce correct and safe methods for the cleaning of optical components.

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4.2 Output Window The only externally exposed optical surface on the ROFIN SC system is the output window or lens. The most common sources of surface contaminants are fingerprints and airborne contaminants (dust, lint, smoke, etc.). If allowed to remain on optical surfaces, such contaminants will cause absorption and light scattering and in extreme cases this may permanently damage 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 front flange 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 appropriate to the objects being cleaned. 4.4 Cleaning Optical Surfaces Hands should be thoroughly washed to remove all oils, perspiration and grit. The hands should then be rinsed free of soap. Lint free gloves can be used for added protection of the optic. If there is visible dust, lint or other solid matter on the optics surface, gently blow it off with a photographic blower brush. Coated optics require careful handling, even the type labelled 'hardcoated'. If the surfaces are not badly contaminated, cleaning can be done fairly easily, a fresh sheet of lens tissues folded to form a pad several layers thick. Its size will be a compromise between fully covering the diameter or width of the surface and being too large to clean evenly. Enough optical grade solution to just dampen the pad should be applied with a medicine type dropper.

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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 pads each time will minimise the possibility of scratching the optical coating. When the optic is clean, replace the optic and lens shroud and reconnect the compressed air. Where severe contamination has permanently damaged the optic, replace with a new component of the correct specification. 4.5 Purge Gas Supply A purge gas supply may be required where there is a possibility of contamination of the optics and other parts inside the Laser Head when the system is operated in humid or very dusty environments. Contamination of the optics will result in optics damage and a reduction in the optical output power from the Laser Head. If the internal or external beam delivery is contaminated with fume, water vapour or debris then these contaminants can absorb the laser energy and cause laser power fluctuations and steering of the laser beam. To prevent this contamination, a clean, dry and non-flammable gas supply is recommended in humid or very dusty environments to provide slight positive pressure on inside the Laser Head. The purge gas requirements and recommended specification are given in section 2.4 of this manual. Refer to the relevant manufacturer’s instructions for maintenance of the purge gas supply and any associated equipment. 4.6 General Cleaning Always ensure that the system is switched off and isolated from the mains supply 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 external cabinets, etc. Take care not to allow entry of water into any of the electrical cabinets.

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Appendix 1

Safety Labels

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ROFIN SC x10

Appendix 1 – Safety Labels ROFIN SC Series Safety Labels As required by EN60825, appropriate warning labels have been positioned in specific locations on the system to indicate conditions under which the user could be exposed to laser radiation. The following gives details of those labels, 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 possibility of hazardous laser radiation.

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

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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

906-0002-00 Rev 9 EN

 2002 Rofin-Sinar UK Ltd

Safety Labels A1 - 2

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)

906-0002-00 Rev 9 EN

 2002 Rofin-Sinar UK Ltd

Safety Labels

A1 - 3

Appendix 2

Additional Information

906-0002-00 Rev 9 EN

 2002 Rofin-Sinar UK Ltd.

ROFIN SC x10

Water In

Laser

Control

FAUX

200 - 240V ac (50 - 60 Hz)

Supply

Water Out

Enable

PSU Enabled

Over Temp.

Output OK

Supply OK

ROFIN - SINAR UK

Water In

Laser

Control

FAUX

Supply OK

200 - 240V ac (50 - 60 Hz)

Supply

Water Out

Enable

PSU Enabled

Over Temp.

Output OK

ROFIN - SINAR UK

A

B

C

D

1

1

1 6 2 7 3 8 4 9 5

Control

RF PSU

DC POWER SUPPLY

48V

/VSWR STATUS 0V VSWR STATUS 0V OVER MODULATION 0V /MODULATION 0V MODULATION 0V RF ENABLE 0V RF FORWARD 0V RF REFLECTED

2

SHUTTER ENABLE EMISSION INDICATOR SHUTTER OPEN SNS 0V SHUTTER CLOSED SNS 0V PSU HEALTHY COMMON (RELAY CONTACT) LAMP HEALTHY PSU HEALTHY N/C (RELAY CONTACT)

1 9 2 10 3 11 4 12 5 13 6 14 7 15 8

2

3

1 14 2 15 3 16 4 17 5 18 6 19 7 20 8 21 9 22 10 23 11 24 12 25 13

RF CABLE

3

1 14 2 15 3 16 4 17 5 18 6 19 7 20 8 21 9 22 10 23 11 24 12 25 13 1 14 2 15 3 16 4 17 5 18 6 19 7 20 8 21 9 22 10 23 11 24 12 25 13

4

Laser Interface

4

5

48V 1 48V 2 SHUTTER OPEN SNS 3 SHUTTER CLOSED SNS 4 0V 5 0V 6 DC ENABLE 1 7 DC ENABLE 2 8 SHUTTER ENABLE 9 LAMP HEALTHY 10 11 EMISSION INDICATOR 12

CHECKED

Drawn By N.PRIESTLEY Date 25-Jul-2000 Scale

TITLE

6

7

8

A3

York Way, Willerby Kingston Upon Hull HU10 6HD England Tel: 01482 650088 Fax: 01482 650022

OF

1

REVISION 1

1

SHEET

SHUTTER DUMP TEMPERATURE SWITCH

SC x10 WIRING DIAGRAM Mech Eng Proj Eng PART No. REV MODIFICATION DATE Elec Eng 150-0076-03 D:\training\Scx Tarining 4-4-00\documents\folder\scx10wiring\0076rev1.Sch 15:16:19

CON3

SHUTTER DUMP TEMPERATURE 1 SHUTTER DUMP TEMPERATURE 2

CON1 1 2

8

LASER TEMPERATURE SWITCH

WATER FLOW SWITCH

LASER EMISSION LAMP

SHUTTER NORMALLY CLOSED IN THE DE-ENERGISED STATE

0V 48V LAMP DRIVE 48V WATER FLOW SWITCH 1 WATER FLOW SWITCH 2 LASER TEMPERATURE 1 LASER TEMPERATURE 2 12V SHUTTER DRIVE

7

CON2 1 2 3 4 5 6 7 8 9 10

PREIONISER

LASER TUBE

6

ENVIRONMENT CONTROLLER

LASER HEAD MODULE

5

A

B

C

D

A

B

C

D

1

PSU HEALTHY

PSU HEALHY

1

CONTROL/8

CONTROL/7

CONTROL/5

CONTROL/4

2

2

0V

RELAY CONTACTS

3

3

4

4

0V

0V

VCC

Q8 BC337

Q13 BC337

Q11 BC327

10K

R30

R36 2K2

VCC

Q4 BC337

5

R29C L06-3S-10K

R38C L06-3S-10K

0V

5

0V

1K

R5

0V

Q1 BC337

220R

R3

6

CHECKED

TITLE

LAMP HEALTHY

6

6

9

5

Front View

York Way, Willerby Kingston Upon Hull HU10 6HD England Tel: 01482 650088 Fax: 01482 650022

9 WAY D TYPE MALE/PLUG

1

8

1

OF

1

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7

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A3

REVISION 1

SCX10 DC INTERFACE - CONTROL CONNECTOR

EMISSION INDICATOR

SHUTTER CLOSED

SHUTTER OPEN

Drawn By N.PRIESTLEY Date 25-Jul-2000 Scale

CONTROL/9

CONTROL/6

CONTROL/3

CONTROL/2

CONTROL/1

SHUTTER ENABLE

7

Mech Eng Proj Eng PART No. REV MODIFICATION DATE Elec Eng 150-0077-03 D:\training\Scx Tarining 4-4-00\documents\folder\scx10wiring\0077rev1.sch 15:16:00

0V

0V

0V

C10 1nF

220R

R27

0V

C13 1nF

220R

R39

0V

C4 1nF

4K7

R16

Q3 BC337

R15 1K

0V

6 5 6 5

A

B

C

D

A

B

C

D

1

1

DC ENABLE 1

DC ENABLE 2

48V

48V

J1/25

J1/24

J1/23

J1/22

J1/21

J1/20

J1/19

J1/18

J1/17

J1/16

J1/15

J1/14

J1/13

J1/12

J1/11

J1/10

2

2

0V

50

INTERLOCKS

3

3

4

4

0V

0V

VCC

Q8 BC337

Q13 BC337

Q11 BC327

10K

R30

R36 2K2

VCC

Q4 BC337

5

R29C L06-3S-10K

R38C L06-3S-10K

0V

5

0V

1K

R5

0V

Q1 BC337

220R

R3

0V

6

J1/9

J1/8

J1/7

J1/6

J1/5

J1/4

J1/3

J1/2

J1/1

1

CHECKED

Drawn By N.PRIESTLEY Date 25-Jul-2000 Scale

LAMP HEALTHY

6

Front View

25 WAY D TYPE MALE/PLUG

7

25

13

8

A3

York Way, Willerby Kingston Upon Hull HU10 6HD England Tel: 01482 650088 Fax: 01482 650022

8

SCX10 LASER INTERFACE DETAILS

14

TITLE

EMISSION INDICATOR

SHUTTER CLOSED

SHUTTER OPEN

SHUTTER ENABLE

7

Mech Eng Proj Eng PART No. REV MODIFICATION DATE Elec Eng 150-0073-03 D:\training\Scx Tarining 4-4-00\documents\folder\scx10wiring\0073rev1.sch 15:16:44

0V

0V

0V

C10 1nF

220R

R27

0V

C13 1nF

220R

R39

0V

C4 1nF

4K7

R16

Q3 BC337

R15 1K

0V

6 5 6 5

OF

1

REVISION 1

1

SHEET

A

B

C

D

ROFIN SC System TTL – RS422 Converter Mk11

(Part No. 009-0020-00)

PLEASE READ AND ENSURE YOU UNDERSTAND THIS DOCUMENT THOROUGHLY PRIOR TO USING THE EQUIPMENT 1.

Overview The RF Power Supply used to drive the Laser Head is fitted with a specialised interface. This is a 15 pin male “D” type connector and carries all the signals required to drive the laser and monitor the status of the RF Power Supply. In order to provide maximum immunity from ambient noise some of these signals are in what is known as a differential two wire format. The purpose of the converter is to allow the user to be able to control 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 which attaches to the RF Power Supply. At the other end of the cable the 15 pin Male end mates with the female connector on the converter. Part No.091-0104-00 has a 15 pin Female “D” type connector fitted to one end but is not terminated at the other. This is a screened 12-core cable and is intended to be connected to the user’s pulse generation and monitoring circuitry.

TTL – 422 CONVERTER

RF POWER SUPPLY

091-0103-00

2.

091-0104-00

Minimum Signal Requirements In order to drive the Laser, the following signals MUST be supplied by the user 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. It needs to be a TTL level signal and is active high. The signal must meet the requirements of the RF Power Supply for pulse width and duty cycle otherwise it will be over-ridden by the monitoring electronics within the RF Power Supply itself. For further details on this see the relevant Operating Manual.

____________________________________________________________________________________________________________ 906-0012-00 Rev 1  1999 Rofin-Sinar UK Ltd Rofin SC System

Signal ground There are four connections provided. As they are all internally connected within the converter, the user is free to select whichever they wish when driving the Laser. Chassis ground This connects to the chassis of the converter and to the chassis of the RF Power Supply.

Pin Number

Wire Colour

1 2 3 4 5 6

RED BLUE GREEN YELLOW WHITE BLACK

7 8 9 10 11 12 13 14 15

BROWN VIOLET ORANGE PINK TURQUOISE GREY Not Connected Not Connected CABLE SCREEN

Function

Output VSWR Status (inverted output) Output VSWR Status (normal output) Output Over-modulation output Input Modulation signal for laser Input 5v supply to converter at approximately 50 mA Input: User supplied RF Enable input signal TTL level (Active High) Output RF Forward power Output RF Reflected power Ground Signal ground Ground Signal ground Ground Signal ground Ground Signal ground

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 signals as detailed previously are supplied, Laser Radiation will be produced. All safety procedures as detailed in the relevant Operator's Manual must be implemented and followed.

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

____________________________________________________________________________________________________________ 906-0012-00 Rev 1  1999 Rofin-Sinar UK Ltd Rofin SC System

3.

Additional Signals

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

RF ENABLE ON/OFF Switch

____________________________________________________________________________________________________________ 906-0012-00 Rev 1  1999 Rofin-Sinar UK Ltd Rofin SC System

A

1

0V

1K

1K R11

1K R10

R9

1K

1K R8

R7

VSWR_STATUS_N

VSWR_STATUS

OVER_MODULATION

MODULATION_IN_N

MODULATION_IN

RF_ENABLE

RF_FORWARD

RF_REFLECTED

1

3

MNT1 CON1

2

MNT2 CON1

1

0V

MNT8 CON1

MNT7 CON1

MNT6 CON1

MNT5 CON1

MNT4 CON1

MNT3 CON1

1

MOUNTING HOLES

8 15 7 14 6 13 5 12 4 11 3 10 2 9 1

1

B

DB15F

CON1

1

3

1

C

2

1

0V

1K

R3

5

6

8 7

DS8921

DO-

DO+

RI+ RI-

U1

2K2

R2

DI GND

RO

VCC

3 4

2

1

J1 CON2

0V

1 2

D

1

1

4

4

1K

R1

VCC

5

5

0V

R5 10K

0V

R6 10K

REV MODIFICATION \\Necatia\sharing neca\0011rev3.sch

0V

R4 10K C3 1500pF

C4 10nF

C5 10nF

C2 10nF

6

6

0V

0V

11:56:32

CHECKED Mech Eng Proj Eng DATE Elec Eng 28-Jun-1999

0V

D1 SA5.0

Drawn By Date Scale

TP1 TESTPOINT

C1 22uF 35V

1

VSWR_STATUS_N

VSWR_STATUS

0V

OVER_MODULATION

PULSE_INPUT

RF_ENABLE_SIGNAL

RF_FORWARD

RF_REFLECTED

7

150-0011-01

TTL TO RS422 CONVERTER PART No.

TITLE

7

8

A3

York Way, Willerby Kingston Upon Hull HU10 6HD England Tel: 01482 650088 Fax: 01482 650022

CON16

16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

J2

8

OF

1

REVISION 3

1

SHEET

A

B

C

D