nLIGHT alta

Operators Manual │ nLIGHT alta™Rack Mounted Fiber LaserTABLE OF CONTENTSTABLE OF CONTENTS (2)REVISION HISTORY (4)SUPPORT (5)ABOUT THIS MANUAL (5)1 LASER SAFETY (6)1.1 Responsibility for Safety (6)1.2 Laser Classification (6)1.3 Hazards and Safety Symbols (6)1.4 Safety Guidelines (7)1.5 Product Safety Labels (9)1.6 Thermal Protection (9)1.7 Electrical Safety (9)1.8 Safety Compliance with Government Requirements (10)1.9 Applied Standards and Regulations (10)1.10 Further Reading (11)2 MODULE DESCRIPTION AND SPECIFICATIONS (11)2.1 nLIGHT alta TM Rack Mounted Fiber Laser (11)2.2 System Enclosure (12)2.3 Process Fiber (13)2.4 Safety Interlocks (13)3 INSTALLATION (14)3.1 De-Crating and Initial Inspection (14)3.2 Facilities System Connections (15)3.2.1 Cooling System Connection (15)3.2.2 CDA Purge Connection (17)3.3 Process Fiber (17)3.4 Electrical Power Connections (18)3.4.1 DISCONNECT REQUIREMENTS (19)3.4.2 CONNECTION (19)3.5 Control System Connections (19)3.5.1 Command-Line Control Connections (20)3.5.2 External Hardware Control Interface Connections (20)3.5.3 Ethernet Connections (22)3.5.4 Laser Safety Interlock Connections (23)3.5 Software Installation (23)3.6 Network Configuration (24)3.7 Firewall Configuration (26)4 OPERATION (28)4.1 nLIGHT alta TM States (28)4.2 Laser Emission Control (30)4.3 Software User Interface (30)4.3.1 LASER EMISSION Window (32)4.3.2 LASER CONTROL Window (32)4.3.3 STATUS Window (33)4.3.4 SYSTEM CONTROL Window (34)4.3.5 PARAMETERS Window (36)4.4 Starting Up the nLIGHT alta TM (36)4.5 Shutting Down the nLIGHT alta TM (37)4.6 Operating the Aiming Laser (38)4.7 Enabling the Laser (39)4.8 Operating the Laser (40)4.9 Disabling the Laser (40)4.10 Clearing an Error (40)4.11 Clearing a Warning (40)4.12Clearing a Fault (41)5 SOFTWARE COMMANDS (41)5.1 RS-232 Command-Line Control Interface (41)5.2 External Hardware Control Interface (45)5.3 Status Strings (47)5.4 Changing Control Modes (47)6 RETURN FOR FACTORY SERVICE (49)7 GLOSSARY OF TERMS (50)8 APPENDIX (51)8.1 APPENDIX A – DIAGRAMS (51)8.1.1 Input Signal Wiring Diagrams (51)8.1.2 Output Signal Wiring Diagrams (51)8.1.3 GatING OUT Signal Wiring Diagrams (52)8.2 APPENDIX B – CHINA EEP HAZARDOUS SUBSTANCE INFORMATION (53)CUSTOMER FEEDBACK FORM (54)REVISION HISTORYSUPPORTFor technical support, please contact n LIGHT Sales & Service Headquarters:n LIGHT CorporationSales & Service5408 NE 88th Street, Building EVancouver, WA 98665, USATel: 360-566-4460Fax: 360-546-1960Website: w Sales Team: s ales@ABOUT THIS MANUALThis instruction manual contains information to help buyers and operators understand how to prepare, operate, and maintain the n LIGHT Photonics alta TM Rack Mounted Fiber Laser.This manual will assist in operating the laser safely and properly. Careful attention to this manual will help avoid risks, reduce repair costs, reduce process downtime, and increase the overall reliability of the laser system.The instruction manual must be read and complied with by users of this laser product. Specific topics covered in this instruction manual include:∙Laser safety∙Installation∙OperationThis instruction manual provides guidelines for safe and reliable laser system operation. In addition to following the instructions in this manual, the laser operator should adhere to mandatory safety regulations, professional technical rules for laser safety, and other professional guidelines for safe laser operation.This instruction manual is copyrighted with all rights reserved. Under copyright law, this document may not be copied in whole or in part or reproduced in any other media without the express written permission of n LIGHT.n LIGHT, the n LIGHT logo, and nLIGHT alta TM are registered trademarks of n LIGHT, Inc.1 LASER SAFETYn LIGHT laser systems are carefully designed and tested to ensure that they are safe and reliable tools when used properly. However, n LIGHT laser systems typically emit light at wavelengths and optical powers that can be extremely hazardous to both people and property if the appropriate safety guidelines are not followed. This danger can be compounded when the output wavelength of laser light is invisible to the naked eye in the infrared spectrum, as is the case with this laser system.1.1 Responsibility for SafetyThe nLIGHT alta TM Rack Mounted Fiber Laser is not suitable for direct use and is solely intended to be integrated into a laser product certified by the Purchaser. The device lacks mechanical and/or safety features that contribute to the safe and proper operation of the integrated end product. The Purchaser acknowledges that their integrated end product must comply with the applicable regulations and standards before it can be sold to an end user.1.2 Laser ClassificationGovernmental standards and requirements specify that the laser system must be classified according to the output power or energy and the laser wavelength. In the U.S.A. the nLIGHT alta TM Rack Mounted Fiber Laser is classified as Class IV based on 21 CFR, subchapter J, part II, section 1040-10(d). Internationally, the nLIGHT alta TM Rack Mounted Fiber Laser is classified as Class 4 based on the international standard 60825-1:2007. The laser is designed to emit radiation in the infrared part of the spectrum at 1080 nm and has additional spectral content at both 920 and 1135 nm.The nLIGHT alta TM Rack Mounted Fiber Laser also includes an integrated visible (630-665 nm), low power aiming laser beam to assist in optical alignment. The integrated aiming laser is classified as Class IIIb or Class 3B according to the same documents, respectively.Throughout this manual these classifications will be referred to as Class 4 and Class 3B.1.3 Hazards and Safety SymbolsThe following table details the safety consideration symbols used to indicate hazards based on the standard DIN EN 61 310-1.Thisguidelines here can result in life-threatening injuries or death.This symbol indicates an imminent danger of electrical energy. Failure to follow the guidelines here can result in life-threatening injuries or death.This symbol indicates a potentially hazardous situation for the operator. Failure to follow the guidelines here can have serious adverse health effects, leading to life-threatening injuries or death.This symbol designates application tips and other useful information.WARNING may result in serious bodily harm or death to you and/or others. Do not proceed beyond the WARNING sign until you completely understand and meet the required conditions.CAUTION may result in damage or destruction to the product or components. Do not proceed beyond the CAUTION sign until you completely understand and meet the required conditions.IEC WARNING TRIANGLE output of this device. This indicates a danger of coherent electromagnetic radiation.Risk of Electrostatic Discharge damaging components.Wear laser safety glasses.Figure 1 - Hazard Symbols Used in this ManualThe Equipment and Product Safety Act requires manufacturers to have operators and users observe generally accepted laser operation guidelines and standards, as well as the Occupational Safety and Accident Prevention regulations.1.4 Safety GuidelinesHigh-power laser systems such as the nLIGHT alta TMRack Mounted Fiber Laser are capable of producing light at power levels and wavelengths that could cause permanent eye damage and other bodily harm if proper safetyguidelines are not followed. In addition to the main beam, any reflections that create secondary beams can also be ofsufficient power to cause eye damage. The nLIGHT alta TMoperates at a high enough power to burn skin, clothing, or other surfaces. Volatile substances can inadvertently be ignited.n LIGHT provides the following recommendations to promote safe use of the nLIGHT alta TMRack Mounted Fiber Laser . Operators are advised to adhere to these recommendations and employ sound laser safety practices at all times.∙Use protective eyewear when operating the laser system or when inside the laser controlled area, and guard against inadvertent exposure to skin or clothing. Be sure to select eyewear that is suitable for use with the wavelengths and radiation intensity that the laser system emits.∙Do not open the protective housing, which confines internal reflections so that they are not hazardous to operators. There are no panel removal switches in the safety interlock chains.∙ Never look directly into the laser beam.∙Provide enclosures for the laser beam whenever possible. Use a beam stop of appropriate material to terminate any potentially hazardous laser beams. Use diffusely reflecting materials near the beam, where appropriate. Cover/block windows, doorways, open portals, etc. to reduce escaping laser beams below appropriate ocular MPE levels.∙ Post the appropriate warning signs and placards.∙ When operating the laser system, limit access to the area to individuals who are trained in laser safety. ∙ Avoid operating the laser system in a darkened environment.∙ Do not use the laser system in the presence of flammables, explosives, or volatile solvents such as alcohol, gasoline, or ether. Ensure that the laser controlled area is adequately ventilated.∙Do not operate the laser system with damaged cables, hoses, or fibers. Defective cables, hoses, and fibers must be replaced before system start-up. Prior to system start-up, verify that all cables, hoses, and fittings are properly and securely connected. Faulty connections can interrupt operation and cause irreparable damage to this product.∙ Shut down the laser system in the event of a malfunction, and contact an n LIGHT Service Representative. Do not resume operation until the malfunction has been completely resolved.∙ Install the laser system in close proximity to the main disconnect circuit breaker panel or switch. Ensure that the main disconnect is clearly marked and within immediate reach of the operator at all times.∙All Class 4 lasers and laser systems require a master switch control. The nLIGHT alta TMRack Mounted Fiber Laser master switch control is operated by a key. When disabled (key removed), the laser system cannot be operated. Only authorized system operators are to be permitted access to the key.Figure 2 – Key SwitchDirect ocular interception of the laser output beam can cause serious eye damage orblindness. Protective eyewear is required for operation of the nLIGHT alta TMRack Mounted Fiber Laser to shield all Class 4 emissions.1.5 Product Safety LabelsThe following images show representative laser safety labels and how they apply to the nLIGHT alta TM Rack Mounted Fiber Laser; exact format and content may vary.IdentificationLabel, Class 4Label, Class 4Label, Class 4Figure 3 – nLIGHT alta TM Rack Mounted Fiber Laser Safety Labels1.6 Thermal ProtectionThe nLIGHT alta TM Rack Mounted Fiber Laser is designed to connect to an filtered external cooling system to prevent overheating.∙Thermal management is required for safe and reliable nLIGHT alta TM operation.∙See Installation section for further details about thermal management requirements.1.7 Electrical SafetyThe nLIGHT alta TM Rack Mounted Fiber Laser is designed to operate at voltages and currents that could be dangerous if proper safety precautions are not met. Never remove any of the panels. Doing so will void the productwarranty and expose a risk of electrical shock. Always ensure that the electrical connections are in good workingorder and properly secured before applying any electrical energy to the nLIGHT alta TMRack Mounted Fiber Laser .Electrical energy supplied to the nLIGHT alta TMRack Mounted Fiber Laser can reach as high as 240 VAC and 30A. Every portion of the electrical system should be regarded as posing a risk of electrical shock. 1.8 Safety Compliance with Government RequirementsThis product is not certified in accordance with IEC 60825-1:2014 or 21CFR1040.10/ 21CFR1040.11 and is solely intended to be integrated into a laser product certified by the Purchaser. The Purchaser acknowledges that their product (incorporating the nLIGHT laser product) must comply with the applicable regulations before it can be sold. U.S.A. laser safety requirements are contained in 21 CFR, Sub-chapter J and are administered by the Center for Devices and Radiological Health (CDRH).The text of this federal law is available from the U.S. Government Printing Office Bookstore located in most major cities in the U.S.A. A report detailing how the laser product complies with Federal law is required before the product is shipped. The form of this report is covered in a pamphlet titled Guide for Preparing Initial Reports and Model Change Reports on Lasers and Products Containing Lasers , HHS Publication FDA 86-8259. This pamphlet is available at no cost from:U.S. Department of Health and Human Services Public Health ServiceFood and Drug AdministrationCenter for Devices and Radiological Health Division of Small Manufacturers Assistance Rockville, Maryland 20857 800-638-2041For jurisdictions outside of the U.S.A., it is the responsibility of the buyer of this laser system to ensure that it meets the local laser safety requirements.1.9 Applied Standards and Regulationsn LIGHT recommends adherence to ANSI Z136.1-2014 American National Standard for Safe Use of Lasers or otherapplicable laser safety standards when operating the nLIGHT alta TMRack Mounted Fiber Laser .DANGER ELECTRICITY1.10 Further ReadingFor additional information on laser safety, please refer to the following publications:∙American National Standard for the Safe Use of Lasers, Z136.1, American National Standards Institute, 2014.∙Performance Standard for Laser Products, FDA (FR-40), 148:32252-32265. Department of Health, Education, and Human Service Bureau of Radiological Health, July 31, 1974.∙Laser Safety Guide, Laser Institute of America, 9th Ed., Orlando, Florida 1993.∙Safety with Lasers and Other Optical Sources, D. Sliney and M. Wolbarsht, Plenum Publishing Co., New York, 1980.∙Safety of Laser Products, Part 1: Equipment Classification, Requirements, and User’s Guide, EN60825-1, 2007, European Committee for Electrotechnical Standardization, Central Secretariat, rue de Stassart 35, B-1050 Brussels, Belgium.2 MODULE DESCRIPTION AND SPECIFICATIONS2.1 nLIGHT alta TM Rack Mounted Fiber Lasern LIGHT’s medium power Continuous Wave/Quasi-Continuous Wave (CW/QCW) Fiber Laser (nLIGHT alta TM Rack Mounted Fiber Laser) provides a near diffraction limited or multimode CW or QCW 1080nm beam. Designed for maintenance-free 24/7 industrial operation, the system offers a high brightness solution to meet the rigors of the laser macro and micro materials processing industry. It has been engineered for industrial applications including cutting, welding, and drilling, and was designed for integration into factory automation equipment or a host machine. It cannot be used as a stand-alone product.Figure 4 – nLIGHT alta TM Rack Mounted Fiber Laser (delivery fiber not shown)Figure 5 – nLIGHT alta TM Rack Mounted Fiber Laser Environmental Specifications2.2 System EnclosureThe nLIGHT alta TMRack Mounted Fiber Laser enclosure consists of a 4U high 19-inch rack-mount box. There are no auditory signals or alarms.Figure 6 – nLIGHT alta TMRack Mounted Fiber Laser Mechanical SpecificationsFigure 7 – nLIGHT alta TMFront View and User InterfaceFigure 8 – nLIGHT alta TMBack View and Utility/Communication ConnectionsAC Power Breaker A/C Power Terminal BlockLEDsAnalog Outputs (A1 A2 A3)Key Switch Safety InterlockControl Interface RS-232 EthernetEMOWater Input/OutputAir InputThe Communication Interface panel shown inFigure 8 provides the following input/output:∙CONTROL INTERFACE (HD26 female)∙RS232 (DB9 female)∙ETHERNET (RJ-45)∙SAFETY INTERLOCK (4-pin)∙Analog A1 A2 A3 (BNC for output signals)The RS-232 interface provides for basic commands such as ON/OFF, setting power level, setting modulation rate, and for polling system status.The AC POWER interface shown inFigure 8 consists of a 3-terminal block (L, N, PE-GND).Figure 9 – nLIGHT alta TM Rack Mounted Laser System Electrical Specifications2.3 Process FiberThe QBH connectorized process fiber is designed to routinely handle power in excess of 1 kW with the following specifications:∙QBH connector with AR coated endcap and interlock∙Required water flow rate min 1.5 l/min, max 2.5 l/min (0.10 MPa min, 0.17 MPa max)∙Max 4 bar pressure input to QBH connector∙Minimum dynamic bend radius of 150 mm, static coil radius of 200 mm2.4 Safety InterlocksThe nLIGHT alta TM Rack Mounted Fiber Laser has two redundant (channels A and B) interlock chains with the following internal items as depicted in Figure 10:∙Relays controlled by firmware∙Delivery fiber interlock∙Front panel key switch∙E-STOP switch (the GUI EMERGENCY STOP button will open a firmware controlled relay)When the safety relays are open, all power to the laser diode drivers is removed and no laser power will emit from the device. Additional interlock items may be added to the interlock chain through the connector described in section3.5.4 Laser Safety Interlock Connections.Figure 10 – nLIGHT alta TM Safety Interlock Chain3 INSTALLATIONThe following sections provide a brief overview of installation tasks.3.1 De-Crating and Initial InspectionPlace the shipping container on a sturdy, level surface and open the top of the box. Check the items listed on the packing list and ensure that all items are available in the container. The container generally includes the following items:∙Laser box∙HD26 male connector with shroud/cover∙External interface noise filter box with power supply and short HD26 cable∙Interlock shorting connector∙Laser feet (x4) for use if laser is not rack mounted∙USB stick with User Interface Software and Operators ManualDo not discard the shipping container or foam packaging since these are requiredif the nLIGHT alta TM Rack Mounted Fiber Laser is ever returned to nLIGHT forfactory service.Carefully remove the laser from the container. Inspect the system for any visible signs of shipping damage. Contact n LIGHT if the system enclosure is damaged or if any of the required materials are missing.3.2 Facilities System Connections3.2.1 COOLING SYSTEM CONNECTIONLocation of the water cooling connections are shown in the following figure.Figure 11 – Cooling ConnectionsTo maintain optimal performance and to avoid damaging the cooling system, supplied coolant must be comprised of distilled or filtered water. Water must meet quality specifications listed in Figure 12 - Cooling Water Quality Recommendations.Figure 12 - Cooling Water Quality RecommendationsCAUTION: Using water that does not meet these requirements can lead to premature failure of the laser and is not covered by warranty.Coolant must be drained from system if shut down for more than 2 days. Extended periodsof stagnant coolant can lead to corrosion of the water system and premature failure.Figure 13 - Cooling System Performance SpecificationsTo make the water cooling connections to the module:∙Select the proper I.D. (inner diameter) tubing for connection to the module; standard fittings are ½” or 12.7 mm O.D (outer diameter).∙Make appropriate connections to the water source, either a closed loop chiller or PCW (process chilled water) with sufficient cooling and flow/pressure. It is recommend that blue tubing be used for the supply line, and red tubing be used for the return line.∙Remove the protective covers from the hose barbs as shown in Figure 14–Hose barbs with (left) and without (right) protective covers.Figure 14 –Hose barbs with (left) and without (right) protective covers∙Place hose clamps on both the supply and return tubing.∙Connect supply line from water source onto the module barb labeled “IN”.∙Connect return line to the water source onto the module barb labeled “OUT”.∙Position both hose clamps over the module hoses barbs and tighten as shown in Figure 15–Completed water connections to module.Figure 15 –Completed water connections to module∙After all connections are complete, open return valve to water source. Then slowly open supply valve while checking for leaks.∙If no leaks found, continue with installation. Otherwise, stops leaks by either reseating tubes or tightening hose clamps.3.2.2 CDA PURGE CONNECTIONTo maintain optimal performance and to avoid damaging the system, CDA (Clean Dry Air) must be supplied to the laser to prevent condensation in humid environments. CDA must meet the quality specifications listed in Figure 16 - CDA Quality Requirements.Figure 16 - CDA Quality Requirements* Dew point specification for customer provided CDA.CAUTION: Using CDA that does not meet these requirements can lead to premature failureof the laser and is not covered by warranty.3.3 Process FiberCare must be taken to protect the fiber connector from damage or contamination. A protective cover is provided. After removing the cover, the quartz end-cap should be inspected for contamination and cleaned if necessary before use. To clean the fiber tip:∙Clean with ionized dry air or N2.∙If necessary, wipe gently with lint-free swab moistened with alcohol.The QBH fiber output connector must be cooled on a separate coolant circuit given the different flow requirements listed in Figure 17.Figure 17 - QBH Water RequirementsTo make water cooling connections to the QBH connector (see Figure 18):∙Place SMC MS-5H-6 connectors onto water hoses with 6 mm outer diameter and 4 mm inner diameter.∙Attach connectors to fiber assembly.∙Turn water flow on and check for leaks.CAUTION: Do not overpressurize. Pressure or flow exceeding the values in Figure 17 maycause catastrophic damage to the fiber and QBH connector.Figure 18 - Water lines connected to QBH fiber output connector3.4 Electrical Power ConnectionsThis section describes the electrical power connections to the nLIGHT alta TM Rack Mounted Fiber Laser.This equipment was designed to only operate hard-wired to a main disconnect. It was not designed to have a plug attached, and be removable from an outlet. There is a capacitive charge that remains on the cable for up to 5 minutes after the system breakers are thrown. This charge is high enough to potentially causeserious injury or death.3.4.1 DISCONNECT REQUIREMENTSThe user must provide a main disconnect device. This can be either a fused disconnect or a circuit breaker. The rating shall be 240VAC 3 pole, 30 Amps, and be a UL489 Main Breaker. Alternately, a 240VAC 3 phase, 30 Amp IEC 60947-2 rated breaker or fused disconnect may be used. SCCR of fuse or circuit breaker shall exceed 4kA.3.4.2 CONNECTIONConnect a 3-wire single-phase AC power supply to the input terminals. Power requirements are per Figure 9–nLIGHT alta TM Rack Mounted Laser System Electrical Specifications and require an earth ground connection. Installation process is as follows:1. Strip 1cm off the end of the 3 power wires. Minimum wiring requirements are 300V, 10 AWG 60/75°C AWMWire. UL Style 1015 AWM is recommended. Local wiring codes must be adhered to and may supersede this recommendation.For “S tyle 1 Terminal Block” (see Figure 19):2. Figure 19Use a screwdriver to push in the orange button, then insert the bare wire.3. Release the button after the wire is in.For “Style 2 T erminal Block” (see Figure 19):2. Figure 19Use a flat head screwdriver to release the screw, insert the bare wire in to the slot, then tighten thescrew.3. Ensure that each wire is installed in the appropriate location.4. After the power connections are secure, the laser system can be energized by flipping up the circuit breakeron the lower back panel.Style 1 Terminal Block Style 2 Terminal BlockFigure 19 – AC Power Supply ConnectionL: LineN: NeutralEarth ground3.5 Control System ConnectionsThis section describes the control connections to the nLIGHT alta TM Rack Mounted Fiber Laser.3.5.1 COMMAND-LINE CONTROL CONNECTIONSSerial digital communications with the nLIGHT alta TM Rack Mounted Fiber Laser are made through an RS-232 interface. RS-232 protocol is 9600 baud, 8 data bits, 1 stop bit, no parity, and no hardware handshaking. See section 5.1 RS-232 Command-Line Control Interface for specific RS-232 commands which are available. The RS-232 connector is a 9 pin female D-type situated on the rear of the electrical unit with the following pin designations:Figure 20 - RS-232 Pin DesignationThe nLIGHT alta TM Rack Mounted Fiber Laser may also be controlled over an Ethernet connection with the supplied user interface software. The Ethernet connection is an RJ-45 connector that supports 10/100Base-T connections to a fixed IP address. Only connect through the Ethernet port on a local/private network. Connecting the Ethernet connector to a broad network can overload the host computer CPU with network traffic and adversely affect laser performance. A USB-to-Ethernet adapter or a second network port can be added to the host computer to create a local private network. See section 3.6 Network Configuration for more details on IP address and subnet mask.3.5.2 EXTERNAL HARDWARE CONTROL INTERFACE CONNECTIONSAll signals on the External Control Interface are electrically isolated from the internal system to allow predictable control in heavy industrial environments. The external control interface provides the following functionality: ∙Clearing errors and enabling the laser∙Turning the aiming laser on/off∙Monitoring system status∙Gating the laser emission∙Observing the internally modulated gating signal∙Setting the average output power level through the optically isolated analog input (0-10V)The External Control Interface is an HDB26 female D-type with the following pin designations:Figure 21 - External Control Interface ConnectorCAUTION: Do not plug/unplug the external interface connector with the main AC powersupply turned on. Voltage/current spikes on the external interface pins can cause the signalsto latch up or cause the internal isolated supply to shut down.The external interface supports 0-5V and 0-24V signals. The voltage threshold is 2.7V to support the 0-5V signals. If your system uses 24V signaling, add an nLIGHT-supplied external noise filter box to increase the switching threshold to 12V.Figure 22 - External Noise Filter BoxFigure 23 – External Control Interface Connector Pin-Out3.5.3 ETHERNET CONNECTIONSA custom software user interface using Ethernet communication has been developed allowing users to control the following system attributes:∙Control transitions between the machine states described in section 4.1 nLIGHT altaTM States.∙Control the laser output gating and power level as described in section 4.2 Laser Emission Control.∙Control the aiming laser output and power.∙Save default settings to non-volatile memory (NVM) to be restored at next power up.∙Observe current status and a simple history of recent changes.∙Observe several system parameters that may help with diagnosing system problems.∙Download status logs which can be used to diagnose system problems.3.5.4 LASER SAFETY INTERLOCK CONNECTIONSThe interface with the safety relay is through a 4-pin connector.Figure 24 – Safety Relay Connector Pin-Out∙Both safety A and B must be shorted to turn on the laser. The external interlock plug shipped with the system has two wire loops to short these connections.∙If not shorted at the plug, twisted pairs are strongly advised for the wires between pins 1 and 2, and between pins 3 and 4, to reduce noise.∙To insert the bare wire, depress and hold the orange button with a small screw driver. Release the button after insertion.Pin 1 Pin 4Figure 25 – External Interlock Plug (shorted)3.5 Software InstallationThe minimum host computer requirements for the user interface software are:∙Windows 7 64-bit operating system∙ 1 GHz or faster CPU∙ 1 GB RAM∙500 MB available hard drive space∙USB-to-RS232 adapter and RS-232 (straight through) cable∙Isolated private network to connect through Ethernet。