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LTB MNL100 Operating Manual

Nitrogen laser
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LTB Lasertechnik Berlin GmbH  Am Studio 2c  D-12489 Berlin
Tel.: +49 (0)30 91 20 75-100  Fax: +49 (0)30 91 20 75-199
E-mail: info@ltb-berlin.de  http://www.ltb-berlin.de
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Rev. 4 / October 13
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  • Page 1 Rev. 4 / October 13 LTB Lasertechnik Berlin GmbH  Am Studio 2c  D-12489 Berlin Tel.: +49 (0)30 91 20 75-100  Fax: +49 (0)30 91 20 75-199 E-mail: info@ltb-berlin.de  http://www.ltb-berlin.de...
  • Page 2 With the purchase of a laser from the MNL 100 series, you have selected a state-of-the-art Nitrogen Laser. The laser satisfies sophisticated needs and demanding goals in various applications within the industrial area. The following properties reveal the advantages of the MNL 100. ...

  • Page 3: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS NVISIBLE LASER RADIATION IGH VOLTAGE UP TO ANGEROUS GASES IABILITY EPLACEMENT PARTS SYSTEM REQUIREMENTS LACE AND WAY OF INSTALLATION LECTRIC REQUIREMENTS USES ASER CONTROL COMPUTER INSTALLATION CCLIMATIZING THE LASER NSTALLING THE CONNECTION BETWEEN LASER AND COMPUTER NSTALLATION OF THE USER PROGRAM ARATHON ONTROL EMOTE KEY AND REMOTE SOCKET...
  • Page 4 OPTIONAL FEATURES IGH VOLTAGE CONTROL NERGY MEASUREMENT 5.2.1 ALIBRATION OF THE ENERGY MONITOR TTENUATOR MODULE IN CONNECTION WITH ENERGY MONITOR IBER COUPLING PTICAL TRIGGER WITH ELECTRICAL OUTPUT OEM – APPLICATIONS AUTOMODE OPERATION 6.1.1 TAND 6.1.2 TAND IFFERENCE BETWEEN TANDBY AND RIGGER TANDBY ESCRIPTION OF THE...

  • Page 5: Safety Precautions 5

    1 Safety precautions MNL Lasers are 3B class lasers (IEC 60825-1). Improper treatment and operation of the laser can cause damage to your health. Please follow carefully all the instructions in this manual. 1.1 Invisible laser radiation The laser emits intensive invisible laser radiation in the UV range.

  • Page 6: High Voltage Up To 12 Kv

    1.2 High voltage up to 12 kV A high voltage of up to 12kV is generated in the laser. Perilously high energy amounts are also accumulated in the capacitors of the laser. Therefore, observe the protected earth connection of the mains. The earth conductor connection from the laser housing to the input of the LTB power supply of the laser is ensured.

  • Page 7: System Requirements 7

    2 System requirements 2.1 Place and way of installation The laser has to be operated and stored in a dry, dust- poor and well-ventilated area. Operation temperature °C +15 ... +38 Storage temperature °C -10 ... +60 Max. rel. humidity Air pressure mbar 750 ...

  • Page 8: Electric Requirements

    2.2 Electric requirements The laser is supplied with a low voltage of 24 V DC 2.4 A. A power supply unit providing the low voltage from the mains is part of the delivery as standard. The mains connection values are: 100 to 240 V, 47/63 Hz, 1.1 A (see type label).

  • Page 9: Laser Control, Computer

    2.4 Laser control, computer Using a RS 232 interface connected to a PC or Notebook, the laser can be operated with all functions and settings. The last settings are stored when the laser is switched off and are provided again as basic settings when the laser is switched on again.

  • Page 10: Installation 10

    3 Installation 1 Device cord 2 Power On LED (1 x green) 3 Laser emission indicator LED’s (2 x red) 4 Remote socket 5 External trigger input, optical (HP OWG) 6 RS 232 interface (optical, HP OWG, TX-grey, RX-blue) 7 Sync Out (SMB) (optional) 2 and 3 Installation 10...

  • Page 11: Acclimatizing The Laser

    3.1 Acclimatizing the laser We recommend that the laser is acclimatized before it is switched on in the operating room for 1 hour, if it was exposed to ambient temperatures outside the allowable operational temperature range before. 3.2 Installing the connection between laser and computer A Duplex-OWG is used to establish the connection between the laser and your computer or a notebook.

  • Page 12: Remote Key And Remote Socket

    3.4 Remote key and remote socket The remote socket (see page 10, [4]) is provided for:  Closing the external remote circuit with the remote key  Integrating external applications in the remote circuit of the laser The remote key assures the laser against unauthorized use and serves the additional safety during laser operation.

  • Page 13: Operating The Laser

    4 Operating the laser 4.1 Establish the readiness for operation Connect the power supply unit via the device cord with the mains. Connect the Mate-N-Lok connector to the laser. The Power On LED (green) of the laser must be lightening. (please see 8.1 LED Codes) 4.1.1 Remote key Plug the remote key or remote adapter in the remote socket...

  • Page 14: Connection Establishment

    4.1.2 Connection establishment Start the MarathonControl program. The laser controller automatically switches into the ONLINE mode. The laser-computer-communication is electronically monitored. Laser and computer are properly connected, if the blue and the green triangles in the MarathonControl user interface flash alternately. If however NO CONNECTION flashes, the COM-port must be changed in the user interface.

  • Page 15: Starting The Laser Operation

    4.2 Starting the laser operation You can set all alterable parameters via a mouse click on the user interface or by using the respective underlined letters in the menu bar. After the warm-up period is completed you can take the laser into operation.

  • Page 16: Beam Shutter

    4.2.2 Beam Shutter The laser is equipped with a motor-driven beam shutter which is activated via the interface of the laser. As standard the beam shutter is closed. It can be opened by a software command and is automatically closed again when the laser operation is interrupted.

  • Page 17: Set The Repetition Rate And The Number Of Pulses

    4.2.3 Set the repetition rate and the number of pulses In the field REP.RATE you see the required pulse repetition rate. In the field QUANTITY you see the current pulse number (refers only to Burst mode). Operating the laser 17...
  • Page 18 For changing the value of the repetition rate or quantity, click into the respective display: The input window INPUT REPETITION RATE appears INPUT QUANTITY There you can key in your required values (in integers up to 65535) and confirm them. You can call the input windows by entering "E"...

  • Page 19: Choosing Your Operation Mode

    4.2.4 Choosing your operation mode Approximately seconds after pushed STAND BY button, the following buttons become active: REPETITION ON BURST EXT-TRIGGER Here, you can choose the required operation mode. After pushing one of these buttons, the high voltage is automatically switched on and the laser starts in the selected mode.

  • Page 20: Repetition On

    4.2.4.1 REPETITION ON The laser runs continuously with the repetition rate between 1 and 60 Hz (depending on the laser type, internally limited) set by you. The required repetition rate can be modified when the laser is running. 4.2.4.2 BURST Besides the frequency, you can also choose the pulse quantity in this mode.

  • Page 21: Switching Off The Laser

    4.3 Switching off the laser 4.3.1 Stopping the laser operation If you do not want to operate the laser for some time, you can put it in the STAND BY mode by pushing the button STOP (or "O" on the keyboard). The laser activity will be switched off but the laser remains in the STAND BY mode.

  • Page 22: Switching Off The Laser

    4.3.2 Switching off the laser If you want to switch off the laser completely, press the button LASER_OFF or the space key. Now the laser is switched off. If you wish to start the laser activity again you have to set the laser in the ready-to-operate state again by pressing the button STAND BY...

  • Page 23: Break Time Automatic

    4.3.3 Break time automatic The laser has two independent break timers (BT1 and BT2). After a pre-set time between 30 and 9999 seconds, the laser is switched back in the STAND BY (BT1) and LASER OFF (BT2) mode, if no internal or external trigger signal is registered.

  • Page 24: Optional Features 24

    5 Optional Features 5.1 High voltage control You can change the energy output by varying the high voltage within a range from 100 – 80%. The adjustment can be carried out through both the MarathonControl software panel and the interface. In the MarathonControl window, you can change the high voltage in steps of one or ten percent (referring to the adjustment range) by clicking either the up or down pointing...

  • Page 25: Energy Measurement

    5.2 Energy measurement Optionally, the laser can be equipped with an energy monitor. With this monitor, the energy output can be displayed on your user interface, the energy measuring values are provided as 8-bit values at the laser interface. The energy monitor is adjusted in the factory and should be checked after one year at the latest and if necessary re- adjusted.
  • Page 26 The calibration should be carried out at operating state temperature of the laser and with the frequency the laser is normally used. At first click the 100% HV button. The measured energy value is entered in the window and confirmed with the CAL button.

  • Page 27: Attenuator Module (In Connection With Energy Monitor)

    5.3 Attenuator module (in connection with energy monitor) Via the attenuator module, the laser output energy can be adjusted continuously in a large range. The attenuation is realized before the beam output and the coupling into a fiber. The adjustment can be carried out through both the MarathonControl software panel and the interface.

  • Page 28: Fiber Coupling

    5.4 Fiber coupling The generated laser light is coupled into a quartz fiber behind the shutter or attenuator. The fiber diameter is 200, 600 or 1000 µm. The numerical aperture NA is 0.22. Fibers with a diameter smaller than 600 µm are connected non-detachable to the laser and can therefore not be replaced by the user.

  • Page 29: Oem - Applications

    6 OEM – Applications 6.1 AUTOMODE operation Alternatively to the operation via the optical PC interface, the lasers of the MNL 100 series can be operated without computer. The laser runs in the AUTOMODE with the stored presettings then. Since the beam shutter does not fulfill the safety requirements of system redundancy, the customer has to sign an OEM agreement.

  • Page 30: Autostandby

    The two versions of AUTOMODE 6.1.1 AutoStandBy After applying the operation voltage, the laser is in the StandBy mode. first external trigger pulse activates ext. trigger mode after 8 milliseconds. All further trigger pulses generate laser pulses. Breaks between trigger signals longer than the time set in the break timer BT1 make the laser switch back to StandBy.
  • Page 31 Description of the operation modes of the laser in AUTOMODE If your measuring process comprises longer intervals between the measurements, we recommend to choose the TrgStandBy mode, since the running time of the laser ventilation has a major impact on the maintenance cycles (internal contamination).

  • Page 32: Difference Between Autostandby And Triggerstandby

    6.2 Difference between AutoStandby and TriggerStandby In AutoStandby operation the standby mode will be started directly after switching on the operation voltage and is active after 10 s switch-on delay. The laser remains in standby mode until switching off the operation voltage. To activate the operation mode (high voltage ON) one trigger pulse is necessary.

  • Page 33: Description Of The Break Timers Bt1 Und Bt2

    6.3 Description of the Break Timers BT1 und BT2 - automatic shut down of the laser (to preserve the material) - when using the laser in the AUTOMODE (without PC) only possibility to shut down the laser regularly - also used in PC mode (laser controlling via interface), as additional safety function.

  • Page 34: Safety Functions

    7 Safety functions To ensure a safe laser operation, a number of monitoring functions has been set up. They comprise:  External remote circuit (Remote)  Supervision of the casing, protection against contact  Temperature monitoring inside the laser (advance warning) ...

  • Page 35: Temperature Monitoring

    7.1 Temperature monitoring The temperature monitoring is depicted as a bar on the software control panel. If the internal laser temperature exceeds a limit value, the color of the bar will change to yellow. The laser and the surrounding temperature need to be checked.

  • Page 36: Error Messages

    7.2 Error messages 7.2.1 Static errors  Indication "No Connection" o The Laser-PC connection does not work stable or is interrupted o (erratically blinking triangles) o 30 second after missing or interrupted communication the laser switches off automatically (Polling). o USB-adapter usage in Windows XP (+higher): If the user logs out or the USB connection to the PC is cut, the used USB-port is disconnected from the PC as...

  • Page 37: Dynamic Errors (Operation Errors)

    7.2.2 Dynamic errors (operation errors) Dynamic errors indicate that the tolerance level of the monitored operating limits or components has been exceeded.  Indication "OVERTEMPERATURE" o The temperature in the laser head is recurrently too high  Indication "HV SUPPLY" o The high voltage in the excitation circuit is too high or the recharging of the storage capacitors takes too long).

  • Page 38: Appendix 38

    8 Appendix 8.1 LED Codes Power on Laser OFF Power on 0,4 / 0,4 s statical error is displayed Power on 0,1 / 0,1 s operation error is displayed Power on 0,1 / 1,0 s Laser in AUTOMODE "TrgExtTrg" waits for a trigger für Stand By Power on 1,0 / 1,0 s Laser in Stand By (STOP)

  • Page 39: User Interface Of Marathon Control

    8.2 User interface of Marathon Control Information about Stops the Laser type + Switches off the laser s/n, firmware etc. of laser operation (model) Sets the laser in the OFF the used laser state Signals, that all safety Selection of features are functioning port Port monitoring...

  • Page 40: Inspection And Maintenance

    Inspection and maintenance After the laser has run 2 years or 60 million pulses, the laser should be sent for inspection and cleaning to LTB. Depending on the dust concentration in the cooling air, the air inlet filters of the laser have to be replaced every 6 to 18 months (The filter mat dirties.

  • Page 41: Optional Components

    Optional components The following components and devices are optionally available with the MNL 100:  TWE 40 Trigger converter for the exact optical external triggering, if only an electrical trigger source is available Input: TTL level 50 Ohm Output: Optical waveguide fitting the trigger input of the laser Time jitter: <...

  • Page 42: Warranty

    8.5 Warranty The MNL 100 comes with a warranty of two years from the date of invoice or 6 x 10 pulses, whichever comes first. The warranty includes all parts and labor to repair or replace defects in materials or workmanship. Wear parts, consumables and maintenance items are excluded.

  • Page 43: Specifications, Technical Data

    8.6 Specifications, Technical Data General MNL 100 103-PD / 106-PD 103-LD / 106-LD Wavelength 337.1 Spectral bandwidth Pulse halfwidth FWHM, typ.  140 /  120  80 /  60 J Guaranteed pulse energy (90 % after 60 mill.) ...
  • Page 44 Additional components Energy monitor display accuracy:  8 % with calibration function Attenuator only in combination with an energy monitor transmission max. 90 % attenuation up to approx. 1 % of the laser output energy possible Please note modified external dimension no beam shutter possible (OEM agreement necessary) Fiber coupling transmission approx.

  • Page 45: Dimensions And Interfaces

    8.7 Dimensions and interfaces Appendix 45...

  • Page 46: Functional Block Diagram

    8.8 Functional block diagram Appendix 46...

  • Page 47: Safety Functions

    8.9 Safety functions Appendix 47...

  • Page 48: Delay And Time Jitter

    8.10 Delay and time jitter Appendix 48...

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