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Unitek Miyachi LW250 Operation, Maintenance And Service Manual

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USER'S MANUAL NO. 990-605
REVISION B: May, 1997
OPERATION, MAINTENANCE
AND SERVICE MANUAL
FOR THE
LW250 PULSED Nd: YAG LASER
Copyright © 1997
Unitek Miyachi Corporation
All Rights Reserved
1820 South Myrtle Avenue, P.O. Box 5033, Monrovia, CA 91017-7133
Telephone: (818) 303-5676 FAX: (818) 358-8048

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Summary of Contents for Unitek Miyachi LW250

  • Page 1 USER'S MANUAL NO. 990-605 REVISION B: May, 1997 OPERATION, MAINTENANCE AND SERVICE MANUAL FOR THE LW250 PULSED Nd: YAG LASER Copyright © 1997 Unitek Miyachi Corporation All Rights Reserved 1820 South Myrtle Avenue, P.O. Box 5033, Monrovia, CA 91017-7133 Telephone: (818) 303-5676 FAX: (818) 358-8048...
  • Page 2 Copyright © 1997, Unitek Miyachi Corporation The engineering designs, drawings and data contained herein are the proprietary work of UNITEK MIYACHI CORPORATION and may not be reproduced, copied, exhibited or otherwise used without the written authorization of UNITEK MIYACHI CORPORATION.
  • Page 3 CDRH COMPLIANCE STATEMENT The Unitek Miyachi Corporation LW250 Pulsed Nd:YAG Laser is certified to be fully compliant with all applicable standards and regulations as set forth by the United States of America's Health and Human Services (HHS), Food and Drug Administration (FDA), Center for Devices and Radiological Health (CDRH), standard 21 CFR 1040.10 for Class IV laser devices.
  • Page 4 If you have any questions about the contents of this manual, or find any errors or omissions in it, please notify Unitek Miyachi Corporation. Unitek Miyachi is not responsible for any losses due to improper use of this product. LW250 Pulsed Nd: YAG LASER...
  • Page 5 CAUTION This instruction manual describes how to operate, main- tain and service the LW250 Laser, and provides instruc- tions relating to it's SAFE use. Procedures described in this manual MUST be performed as detailed by QUALI- FIED and TRAINED personnel.

  • Page 6: Table Of Contents

    Prior to Using The LW250 Laser ........
  • Page 7 Preparing the Cooling System ..........5-2 LW250 Pulsed Nd: YAG LASER...
  • Page 8 Deionized or Steam-Distilled Water ......7-2 Draining the Deionized or Steam-Distilled Water ..... . 7-2 LW250 Pulsed Nd: YAG LASER 990-605 REV B: May, 1997...
  • Page 9 ALPHABETICAL SUBJECT INDEX ........INDEX-1 LW250 Pulsed Nd: YAG LASER...
  • Page 10 Capacitor Bank Switching ......... 6-5 LW250 Pulsed Nd: YAG LASER...
  • Page 11 Backup Battery Location ......... 8-12 LW250 Pulsed Nd: YAG LASER...
  • Page 12 Minimum Bend Radius for Optical Fibers ......8-6 Adjustment Screw Ring Turns Required for Defocus ....8-7 LW250 Pulsed Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 13: Chapter 1: Precautions

    Installation Site And Electrical Supply  Install the LW250 Laser securely on a firm, level floor that is free from vibration.  Use 208VAC or 230VAC, 50Hz/60Hz, 3-phase power, with a minimum of 1.5 kVA capacity.

  • Page 14: Minimum Bend Radius For Specified Core Diameter

    (mm) Radius (mm) The LW250 Laser uses either SI or GI core fibers. The maximum input energy/power allowed per fiber is dependent upon core type and core diameter. Input energy/power values in excess of those listed in Table 1-2 may cause damage to the fibers. Length specifications per fiber are: 5 m, 10 m, or 15 m.

  • Page 15: Removal Of Oscillator Head Hold Down Brackets

    To fasten the base of the oscillator head during transportation, yellow hold down brackets are attached as shown in the Figure 1-1. Remove these brackets when installing the LW250 Laser. Retain them for future use when transporting or relocating the laser. Use of these brackets will help to prevent misalignment and damage to the laser oscillator caused by severe vibrations.

  • Page 16: Laser Operation Area

    Do not use paint thinner, benzine or acetone. Design Integrity Do not modify the laser without prior written approval from Unitek Miyachi Corporation. Maintenance Before performing any maintenance on the laser, please read Chapter 7, User Maintenance, thoroughly.

  • Page 17: Chapter 2: System Description

    The screen on the LW250 Laser controller allows the operator to easily and accurately set weld schedules and laser process parameters.  Up to 30 LW250 Lasers can be linked via a host computer in a production environment. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 18: External Controls And Indicators

    CHAPTER 2: SYSTEM DESCRIPTION External Controls and Indicators Figure 2-1 illustrates the controls and indicators on the front of the LW250 Laser. L25CNTLR.WPG Figure 2-1. External Controls and Indicators Status Panel. The functions of the status panel indicators are as follows: ...

  • Page 19: Door Latch

    CHAPTER 2: SYSTEM DESCRIPTION LW250 Laser is interrupted. The LW250 is set to the condition set when the CONTROL key switch is set to OFF. To return to the normal condition, turn the CONTROL key switch to the right (RESET).

  • Page 20: Control Pendant

     EMERGENCY STOP Button: Press this button in an emergency to stop operation of the LW250 Laser. It is a parallel function to the EMERGENCY STOP switch on the control console and the power supply chassis. LW250 PULSED Nd: YAG LASER...

  • Page 21: Internal Controls And Indicators

    CHAPTER 2: SYSTEM DESCRIPTION Internal Controls and Indicators Figure 2-3 illustrates the controls inside the front door of the laser. The functions are as follows: LW25IPNL.WPG Figure 2-3. Internal Controls LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 22: Coolant System Components And Controls

    Cooling Fan Intake Filter: Removes particulate matter from the cooling air.  Power Cable: Supplies 200 Vac or 220 Vac shop power to the LW250 Laser. Coolant System Components and Controls Figure 2-4 illustrates the components and controls in the coolant system. The functions are as...

  • Page 23: External Panels

    Cooling Water Outlet: Outlet port for cooling water.  Cooling Water Inlet: Inlet port for cooling water.  Storage tank for the deionized water that cools the YAG rod and flash lamp. External Panels LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 24: Back Cover

    CHAPTER 2: SYSTEM DESCRIPTION Figures 2-5 and 2-6 illustrate the LW250 Laser housing covers. L25TOP.WPG L25BACK.WPG Figure 2-6. Top Covers Figure 2-5. Back Cover  Cooling Fan Exhaust: Heated air flows out of this vent to cool the interior of the laser chassis.

  • Page 25: Laser Oscillator Head

    Like the laser beam input units, the branch shutters are numbered from 1 to 6, from the front to the back of the laser. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 26: Branch Unit Cover Plate

     Power Monitor Unit: This unit detects and measures the power output from the laser beam. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 2-10...

  • Page 27: Display Screen Descriptions

    ENERGY HIGH/LOW: These fields set the upper limit (HIGH) and lower limit (LOW) of the energy monitor.  AVERAGE: The average power in watts (W) is displayed in this field every second. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 2-11...

  • Page 28: Maintenance Screen

    Maintenance Screen. The data fields in the maintenance screen (Figure 2-10) are as follows: CAUTION Perform only TOTAL COUNT RESET and GOOD COUNT RESET on the maintenance screen. Only qualified maintenance personnel should adjust laser oscillation. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 2-12...

  • Page 29: Status Screen

    PANEL CONTROL: This field may SHUTTER-2:OFF MLE-111A[ indicate one of three control methods. SHUTTER-3:OFF SHUTTER-4:OFF POSITION BLINK:OFF The other two methods are EXTERNAL CONTROL and RS-422 Figure 2-11. Typical Status Screen CONTROL. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 2-13...

  • Page 30: Monitor Screen

    SHUT-1 through SHUT-6: These fields show the status (:OFF or :ON) of the branch shutters.  ML-2531A [V1-01A]: This field displays the ROM version of the LW250 Laser.  MLE-111A [V1-01A]: This field displays the ROM vesrion of the control pendant.
  • Page 31 Monitor Screen (continued) AVERAGE WIDE: When this field displays AVERAGE:ON, the value of AVERAGE is indicated over the entire display screen. With AVERAGE:OFF displayed, the value is shown in normal size. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 2-15...

  • Page 32: Chapter 3: I/O Signal Interface

    Used as common line input signals. Shutter Open Closed: Shutter opens and laser beam can be output. *NOTE: When multiple welders are used simultaneously, use a transistor signal as the laser start signal. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 33: Contact Signals

    CHAPTER 3: I/O SIGNAL INTERFACE Input Signals (continued) Contact signals. The contact signals are as illustrated in Figures 3-1 and 3-2. L25INSW1.WPG Figure 3-1. Input Contact Signals on Connector EXT. I/O (1) LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 34: Transistor Signals

    3-3. The input signal specifications are as follows:  Pin No. 15, +24V output: Pin to be used only for LW250's internal circuit connected to Pin 16. When a contact signal is input, short this pin to Pin 16. (Do not connect any pin other than Pin 16.)
  • Page 35 Pin No. 31, HV-ON: If the COM-HV-ON circuit is closed, high voltage is applied. If the COM-HV-ON circuit is opened, the high voltage is turned off. L25INTR1.WPG Figure 3-3. Input Transistor Signals on Connector EXT. I/O (1) LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...
  • Page 36 Pins No. 37-40, Schedule 1/Schedule 2/Schedule 4/Schedule 8: The set schedule is selected according to input of schedule 1, 2, 4 and 8. For schedule selection, refer to the following table. Input Signal Specifications, EXT. I/O Connector (1) (continued) LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...
  • Page 37 If BANK ALARM (Capacitor bank trouble) is indicated, check the voltage difference caused by change of the schedule and the discharge cycle time to see if the latter time is proper. Input Signal Specifications, EXT. I/O Connector (1) (continued) LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 38: Output Signals

    Closes when the energy monitor detects that the laser energy is within the preset range Low/High No Closes when the energy monitor detects that the laser energy has Light exceeded the preset range LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 39: Output Signal Circuits

    LIGHT signal is indicated.  Pin No. 13 -- 14, External Input enable: When this circuit is closed, the laser can receive external signals. Output Signal Specifications, EXT I/O (1) Connector LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 40: Output Signals On The Ext. I/O (1) Connector

    CHAPTER 3: I/O SIGNAL INTERFACE L25RLY.WPG Figure 3-5. Output Signals on the EXT. I/O (1) Connector LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 41: Output Signals On The Ext. I/O (2) Connector

     Pin No. 3 -- 9 and 19 -- 21 , Shutters 1 through 6: When shutters 1 through 6 are open, their associated circuits are closed. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 3-10...

  • Page 42: Chapter 4: System Timing

    CHAPTER 4 SYSTEM TIMING Operation from the Control Pendant:Simultaneous Splitting of the Laser Beam Into Two Branches L25TMG1.WPG LW250 PULSED N:d YAG LASER 990-605 REV B: May, 1997...

  • Page 43: Operation From External Signals: Simultaneous Splitting Of The Laser Beam Into Two Branches

    CHAPTER 4: SYSTEM TIMING Operation from External Signals:Simultaneous Splitting of the Laser Beam Into Two Branches L25TMNG2.WPG LW250 PULSED N:d YAG LASER 990-605 REV B: May, 1997...
  • Page 44 CHAPTER 4: SYSTEM TIMING Operation from External Signals: Two Simultaneous Time Periods and Simultaneous Split of the Laser Beam into Two Branches L25TMNG3.WPG LW250 PULSED N:d YAG LASER 990-605 REV B: May, 1997...
  • Page 45 CHAPTER 4: SYSTEM TIMING Repeat Operation: Simultaneous Split of the Laser Beam Into Two Branches L25TMNG4.WPG LW250 PULSED N:d YAG LASER 990-605 REV B: May, 1997...

  • Page 46: Repeat Operation At High Speed (25 Pps Minimum)

    CHAPTER 4: SYSTEM TIMING Repeat Operation at High Speed (25 PPS Minimum) L25TMNG5.WPG LW250 PULSED N:d YAG LASER 990-605 REV B: May, 1997...

  • Page 47: Chapter 5: Getting Started

    Connect the other end of the power cable to the shop 208/230 VAC, 3-phase power source. The power source must have a minimum capacity of 1.5 kVA. L25PWR.WPG Figure 5-2. Power Cable Connections LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 48: Preparing The Cooling System

    (electrical resistivity). L25WTR.WPG Refer to Figure 5-3. Unscrew the Figure 5-3. Cooling System Preparation lid thumbscrews and remove the deionized water tank lid. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 49: Optical Fiber Connection

    Signal Cable. If an interlock signal cable is used on the focusing head or laser room door, connect the interlock signal cable to the LW250 Laser as shown in Figure 5-4. Before Connecting The Fibers. Verify that the optical fiber's end surfaces are perfectly clean.

  • Page 50: Input Focusing Adjustment, Z-Axis

    Figure 5-6. Fiber Connector Fastening Input Focusing Adjustment, Z-Axis. On initial set-up, and whenever fiber core diameters are changed, the Z-axis focus adjustment on the input focusing unit must be adjusted. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 51: Input Focusing Adjustment, X-Y Axes

    Blow it clean as previously described. Insert the fiber connector into the final focusing head and secure it as previously described. SIGCBL.PCX Figure 5-7. Final Focusing Unit Connection LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 52: Connection To Final Focusing Unit

    CAUTION: Always use an air blower designed for use on high quality optics, such as a photographic air blower. Never use cleaners or air supplies with silicones or oils. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 53: Chapter 6: Operating Instructions

    OPERATING INSTRUCTIONS Preparation for Operation Verify that the electrical supply meets the requirements of the LW250 Laser. It requires a supply of 230 VAC, 1.5 kVA (minimum), 3-phase with a 10 amp circuit breaker in the line between the laser and the supply. The electrical supply connection must meet ALL local, state and federal safety standards.
  • Page 54 LASER POWER MONITOR: Indicates the state of the power monitor unit sensor. READY or NOT READY will be displayed according to the state of the power monitor unit, as follows: NOT READY: Warming up READY: Warmed up LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...
  • Page 55 (see Figure 6-1). In step a of Figure 6-1, a certain menu is selected and the conditions are set by repeating steps b, c, and d. Refer to the screen definitions in Chapter 2 for screen detail descriptions. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 56: Screen Selection

    CHAPTER 6: OPERATING INSTRUCTIONS Turning Power ON and OFF (continued) Figure 6-1. Screen Selection LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 57: Waveform Control

    CHAPTER 6: OPERATING INSTRUCTIONS Waveform Control The LW250 Laser generates a waveform (pulse shape), as shown in Figure 6-2, by combining the flash lamp pulse duration (FLASH1, FLASH2, FLASH3), interval time (COOL1, COOL2) and the voltages (VOLTA, VOLTB). The voltage can be set to either VOLT A or VOLT B.

  • Page 58: Laser Output

    COOL2 00.0ms COOL2 00.0ms FLASH3 00.0ms A (or B) FLASH3 00.0ms A (or B) A=300V* B=301V* A=300V* B=301V* *A and B set almost equal *A and B set almost equal LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 59: Flash2

    A (or B) COOL2 00.0ms COOL2 00.0ms FLASH3 00.0ms A (or B) FLASH3 00.0ms A (or B) A=400V* B=300V* A=400V* B=300V* *A and B set differently *A and B set differently LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 60: Laser Output With Volt A Set Substantially Different To Volt B

    Figure 6-7 is a graph that shows you how to determine the time needed for the discharge cycle. Figures 6-8 and 6-9 illustrate two situations: single shot and with waveform control. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 61: Applying Multiple Weld Schedules

    COOL1 00.0ms FLASH2 00.0ms A (or B) FLASH2 00.0ms A (or B) COOL2 00.0ms COOL2 00.0ms FLASH3 00.0ms A (or B) FLASH3 00.0ms A (or B) A=450V B=500V A=410V B=500V LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...
  • Page 62 VOLT FLASH1 FLASH1 420 FLASH2 FLASH2 300 When controlling the waveform with two voltages, check the difference between VOLT A and VOLT B, then set the lower discharge cycle. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 6-10...

  • Page 63: Setting The Opening And Closing Of Shutters

    :ON. For example, if you open Branch Shutter No. 1 by changing SHUTTER-1:OFF to SHUTTER_1:ON, The SHUTTER 1 indicator will turn on and Laser Bean Input Unit 1 will be selected. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 6-11...

  • Page 64: Selection With External Control

    Control Pendant (local control): Press the LASER START/STOP key.  External Signals (remote control: Refer to Chapter 3 to identify the required control changeover, schedule selection, and start signals. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 6-12...
  • Page 65 If the fiber guides in the fiber outlets are opened without optical fibers installed in them, the scattered laser beam will be radiated. Also, dust will enter the laser beam input unit. GUIDES.WPG Figure 6-10. Fiber Guide Installation Precaution LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 6-13...

  • Page 66: Chapter 7: User Maintenance

    If the high voltage has been ON, wait at least 5 minutes for the capacitor to fully discharge before proceeding. Air Filter Cleaning. Refer to Figure 7-1. To clean the air filter: AIRFLTR.PCX Figure 7-1. Air Filter Removal LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 67: Air Filter Cleaning

    Draining the Deionized or Steam-Distilled Water. To drain the deionized or steam-distilled water, proceed as follows: Note: The heat exchange coolant water is to be partly/completely drained under the following conditions:  When moving or transporting the laser. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 68: Draining The Deionized Or Steam-Distilled Water

    L25COOL2.WPG Figure 7-2. Cooling System Components 5. Check the water tank fill level and add water if needed. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 69: Cleaning Or Replacing The Small Water Filter

    7. Reinstall the drain pipe and its cap, then fill the tank with deionized or steam- distilled water up to the upper level mark. 8. Reattach the water tank top cover using the two thumb screws. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 70: Replacing The Existing Flash Lamp

    This will allow the laser chamber to fill with water. 9. Recheck the fill level of water in the water tank. If necessary, remove the tank cover, add water to the upper level mark, and replace the tank cover. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 71: Coolant Water Draining: For Long Term Storage; When Transporting The Laser; Or Whentemperature Drops Below 0°C

    8. Blow air into the outlet hose connection L25PUMP.WPG Figure 7-5. Pump Hose joint to remove residual water in the Connections tank. 9. When the water is completely drained, reconnect the outlet hose to the pump. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 72: Cleaning The Solenoid Valve Strainer

    7. Secure the top housing on the solenoid body with four bolts. 8. Reconnect the coolant supply hose and turn on the LASERVLV.WPG water supply. Figure 7-6. Solenoid Valve Cleaning LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 73: Draining Cooling Water

    Turn On AC power and turn ON the keyswitch to start the cooler. Confirm that no water leakage occurs. Turn OFF the keyswitch and the AC power. Install the left side cover on the laser. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 74: Chapter 8: Service

    CHAPTER 8 SERVICE Precautions Before starting service on the LW250 Laser, read the following precautions carefully:  Read the instructions and precautionary information in this chapter BEFORE starting any service procedures.  Turn OFF the power to the laser before starting service work. If the high voltage has been ON, wait for 5 minutes for the capacitors to discharge after turning OFF power before starting work.
  • Page 75 Place the flash lamp on a clean cloth and separate it from the flow tube. Clean the glass part of the new flash lamp with alcohol. Flash Lamp Replacement (continued) LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...
  • Page 76 Set the maintenance mode with the laser cover interlock switch (see Figure 8-1). Confirm that the LED indicator lights. Turn on YAG laser power. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 77: Alignment Of The Ban Into The Fiber Optic Cable

    Turn on the power to the laser. The alarm lamp will light, indicating that the interlock is disabled. Turn on the CONTROL key switch. Turn off the high voltage (HV: OFF) Turn ON the aiming laser beam (POSITION: ON) LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 78: Branch Unit Cover Plate Location

    FIBRSCOP.PCX fiber during this procedure (refer Figure 8-5. Mounting the Fiberscope to Table 8-1). LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 79: Z-Axis Adjustment

    Figure 8-7. Adjusting the Guide Beam LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 80: Adjustment Screw Ring Turns Required For Defocus

    X - Y Axes Adjustment. To adjust the X and Y axes: Refer to Figure 8-8. Loosen the lock nut on the X - Y axes adjustment screw on the input focusing unit. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 81: X-Y Axes Adjustment

    Tighten the lock nut and the X - Y axes adjustment screw. Look into the fiberscope and verify that the direct guide laser beam is located at the center of the fiber end face. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 82: Cleaning The Optics

    Slowly turn the input focusing unit upside down so that the lens paper is on the bottom. Place the input focusing unit gently on a work surface while keeping the lens paper on the bottom. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 83: Removing The Input Focusing Unit Optics

    3. Observe the reflection of fluorescent light on the optic and verify that there is no dust or dry dirt remaining on the optic. Figure 8-11. Removing the Input Unit Optics LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 8-10...

  • Page 84: Cleaning A Contaminated Optic

    Refer to Figure 8-14. Remove the optical fiber from the mating connector. Refer to Figure 8-15. Blow away any dust on the end surface of the fiber. OPTC1FIB.PCX Figure 8-14. Removing the Optical Fiber LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 8-11...

  • Page 85: Optical Fiber Cleaning

    Pass a new band through the hole on the main PCB, then secure the battery in position. LW25BAT.WPG Install the right side cover. Figure 8-16. Backup Battery Location LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 8-12...

  • Page 86: Fuse Replacement

    The first trouble indication line (E01), for example, gives the trouble code number (E01:) and the source of the trouble (POWER SUPPLY COVER OPENED). Malfunction Check List. Check the control panel screen indication and rectify the trouble according to the following table: LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 8-13...

  • Page 87: Malfunction Check List

    Remove the debris or clean the water filter. Low Coolant Level D.I. water level is low. Add D.I. water. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 8-14...
  • Page 88 Main Shutter Trouble The start signal is entered during the branch shutter’s transition period. Allow more lead time for the laser start signal input after the beam selection signal is entered. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 8-15...
  • Page 89 Replace the defective lamp. IGBR Trouble Current is flowing to the flash lamp, but the laser is turned off. Probable defective power supply. Contact Unitek Miyachi. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 8-16...

  • Page 90: Repair Service

    Reset the laser with [RESET] key on the control panel, or input Trouble reset signal through the EXT-I/O. Repair Service If you have problems with your LW250 Laser that you cannot resolve after reading the Troubleshooting section in this chapter and taking the steps recommended in it, please contact our laser...

  • Page 91: Appendix A: Technical Specifications

    APPENDIX A TECHNICAL SPECIFICATIONS LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...
  • Page 92 Average power (W) Counter Total shot counter: 8 digits Good shot counter: 8 digits Alarm display: Message appears on display Aiming/Guide Beam Functions: AUTO OFF function Remote Control Through standard 3-meter cable LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...
  • Page 93 (electrical resistivity). Weight 350kg External Dimensions 1,105 mm (H) x 551 mm (W) x 1,402 mm (D) LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...
  • Page 94 APPENDIX B EXTERNAL COMMUNICATIONS INTERFACE SPECIFICATION LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 95: Appendix B: External Communications Interface Specifications

    ......... B-30 NOTES FOR LW250 CHART ....B-31 Introduction LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 96: Connections

    APPENDIX B: EXTERNAL COMMUNICATIONS INTERFACE SPECIFICATION An RS-485 interface is used for reading and setting schedules; and monitoring data and status of the LW250 Laser Unit from an external computer. Connections To connect a host PC to the laser or several lasers: ...

  • Page 97: Data Format

    APPENDIX B: EXTERNAL COMMUNICATIONS INTERFACE SPECIFICATION fabricated by the user or supplied by Unitek Miyachi. The cable schematic is shown below: Data Transfer (1) Type: Conforms to RS-485, in an asynchronous, full-duplex party line. (2) Baud Rate: 9600 bps (3) Data Format: ...

  • Page 98: Communication Control Code

    BCC Calculation: BCC is the binary coded check sum. It is calculated by adding all bytes after STX and through ETX as listed in the following example C- program: #include <stdio.h> #define STX 0x02 #define ETX 0x03 LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...
  • Page 99 ”, bf[n]); bcc ^= bf[n]; if (bf[n] == ETX) break; printf(“ BCC: %02X\n”, bcc); bf[++n] = bcc; main() Following statement compose a command string to read Repeated PPS of schedule 5 LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...
  • Page 100 /* Code for reading status /* Schedule Number = 1 /* Data No = 1 (pulse width) /* Data value = 20 92.0 msec) ETX); /* End of transmission code clbcc( command ); LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 101: Configuration

    Use the [+] and [-] keys to change the network number. Press the ENTER key to save the network number. Press the MENU key to exit the SERVICE MODE screen. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 102: Contents Of The Commands

    If the set data is within the setting range, [ACK] is returned. If the set data is out of the setting range, [NAK] is returned. For System Setup, set the schedule number to [99] (refer to Section 6(1)). LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 103: Data Setting

    (Data No. 1), (Data No. 2), (Data No. 3), ---, (Last data No.) Enter a comma (,) between data. Return (NAK) when the schedule number or data number is out of range. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 B-10...

  • Page 104: Setting The Status, Control Mode And Schedule Number

    Ext Control Line 0: Panel Control 0: Panel Control 1: External Control No Access 2: Communication 2: Communication Line Control Line Control 3: Maintenance No Access Ignore 1: External Control LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 B-11...

  • Page 105: Reading The Status

    CH1 and CH0 are network numbers, where CH1 = number of tens and CH0 = number of units. SH1 and SH0 are schedule numbers, where SH1 = number of tens and SH0 = number LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 B-12...

  • Page 106: Laser Start Command

    0 = CW 1 = MOD rdy is the READY state, where: 0: Laser start impossible 1: Laser start possible Laser start command Code: $ 0 Host Computer Side Laser Side LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 B-13...

  • Page 107: Laser Stop Command

    CH1 and CH0 are network numbers, where CH1 = number of tens and CH0 = number of units. Valid only for communication line control. Return (NAK) for other control modes. Trouble reset command Code: C 0 Host Computer Side LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 B-14...

  • Page 108: Total Count Reset Command

    After this command is received, the laser unit resets the total counter to 0. Valid for communication line control only. Return (NAK) for other control modes. GOOD count reset command Code: C2 LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 B-15...

  • Page 109: Reading An Error

    E1 and E0 are error numbers, where E1 = number of tens and E0 = number of units. All error numbers are transmitted. If it is normal, the error number is set to [00]. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...

  • Page 110: Contents Of Set Data And Monitor Data

    Average Power Monitor Value 000 - 999 0.1 W Note: The values of the data numbers marked with an asterisk (*) are monitored values. These values can be read but not changed. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 B-17...

  • Page 111: Error List

    Branch Shutter No. 2 error Not used Branch Shutter No. 3 error Not used Branch Shutter No. 4 error Branch unit cover open Branch Shutter No. 5 error Branch Shutter No. 6 error LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 B-18...
  • Page 112 APPENDIX B: EXTERNAL COMMUNICATIONS INTERFACE SPECIFICATION PC-9801, Turbo C Prepared by Turbo C on an NEC Computer /* LW250 maintenance service program */ /* ‘92. 6. 21 */ #include <stdio.h> #include <conio.h> #include <dos. h> #include <graphics.h> #define CTLC (‘C’ - 0x40)
  • Page 113 BX = 0xfc08; /* 8 bits, 2 stop, even pari, xoff, 9600 baud */ geninterrupt(0xdc); c = 0; clrscr(); gotoxy(1,1); cprintf("LW250 RS 485 monitor ‘92. 7. 1) exit... C network # ... e"); gotoxy(1,3); cprintf("input NETWORK # ( 00 30 ) ");...
  • Page 114 ((rs[n-1] == ‘Y’) || (rs[n-1] == ‘y’)){ sprintf(rs, "%s",bfy); rs[1] = id[0]; rs[2] = id[1]; goto p3; if ((rs[n-1] = ‘Z’) || (rs[n-1] == ‘z’)){ sprintf(rs,"%s",bfz); LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 B-21...
  • Page 115 (n=0; n < cnt; ){ /* control no. */ x=wherex(); c = getch(); If ((c >= ‘0')&&(c <= ‘9')){ putch(c); rs[t+n] = c; LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 B-22...
  • Page 116 = c; If (n==1){ ++n; ++x; ++m; ++n; ++x; if (c == CR) return; gotoxy(x,yc); /* rs[] display the contents */ rs(t, n) char t; /* top address */ LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 B-23...
  • Page 117 = bf[n]; ++n; = bf[n]; ++n; bf[n] = bcc; /* n = tx cnt */ return n; /* transmit data until ETX is found */ text() int n; on(); LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 B-24...
  • Page 118 /* bcc and tx cntl set */ ndat(tx buf, tx ntl); /* send +pss */ if (rx idack() == NG) /* wait id ack */ LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 B-25...
  • Page 119 (rs[n] == ACK) || (rs[n] == NAK)) break; if (rs[n] == ‘0') break; ++n; cprintf("receive end !!!"); if (time == TIMEOUT){ if (rs[n-1] == ETX) return OK; else { LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 B-26...
  • Page 120 ++n; if ((bf[0] == id[0]&&(bf[1] == id[1]&&(bf[2] -- ACK)) return OK; return NG; /* clear 256 byte on rs */ cir() int n; for (n=0; n < 0xff; n++) LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 B-27...
  • Page 121 CL = 0x0e; /* rs232c command */ DL = 0; /* ch0 rx data get */ BX = 0xf808; /* 7bits, 2 stop, even pari, xoff, 9600 baud */ geninterrupt(0xdc); LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 B-28...
  • Page 122 /* function 03h */ geninterrupt(0x21); AH = 0; /* write a data to rs232c */ rsout(c) char c; AH = 0x04; /* function 04h */ DL = c; geninterrupt(0x21); LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997 B-29...
  • Page 124 APPENDIX B: EXTERNAL COMMUNICATIONS INTERFACE SPECIFICATION NOTES FOR LW250 EXTERNAL COMMUNICATIONS CHART Control Code in Hexadecimal: ACK: 06H NAK: 15H STX: 02H ETX: 03H Definitions: BCC: Block Check Code STX: Horizontal even parity ON and 1 byte at ETX except STX.
  • Page 125 APPENDIX C SCHEDULE DATA TABLE You may use the LW250 Laser Schedule Data Table on the following page to record the values set in each weld schedule. LW250 PULSED Nd: YAG LASER 990-605 REV B: May, 1997...
  • Page 127 Alphabetical Subject Index LW250 PULSED N:d YAG LASER 990-605 REV B: May, 1997 INDEX-1...
  • Page 128 External panels (2-8) Air filter cleaning External start signals (3-6) Components and controls (2-6) Draining cooling water (7-8) Filter replacement (7-1) Flow rate controller replacement (7-8) Features of system (2-1) LW250 PULSED N:d YAG LASER 990-605 REV B: May, 1997 INDEX-2...
  • Page 129 Internal controls and indicators (2-5) Operation: Precautions (6-13) Ion exchange resin cartridge replacement (7-2) Preparation (6-1) I/O signal interface (3-1) Optical fiber connection (5-3) Optical fiber outlet precautions (6-13) Optics cleaning (8-9) LW250 PULSED N:d YAG LASER 990-605 REV B: May, 1997 INDEX-3...
  • Page 130 Removing the laser oscillator head fittings (5-1) Replacing the cooling system filter (7-1) Table of contents, manual (v) Replacing the flash lamp (8-1) Technical specifications (A-1) Timing diagrams (4-1) LW250 PULSED N:d YAG LASER 990-605 REV B: May, 1997 INDEX-4...
  • Page 131 -T- (continued) Transistor input signals (3-2) Waveform control (6-5) Troubleshooting (8-13) Turning power ON/OFF (6-1) X-Y axes alignment (8-7) User maintenance (7-1) User maintenance precautions (6-1) Z-axis adjustment (8-5) LW250 PULSED N:d YAG LASER 990-605 REV B: May, 1997 INDEX-5...
  • Page 132 3/99 1. Clarification of laser output settings. 2. Correct output signal specifications. 3. Correct Power Turn On conditions for De-ionized water. Unitek Miyachi Lasers Q P. O. Box 5033 Q Monrovia Q CA 91017-7133 Q (626) 303-5676 Page 1of 4...
  • Page 133 Above 3.00 megohms per cm READY: NOT READY: Equal to or below 3.00 megohms per cm Unitek Miyachi Lasers Q P. O. Box 5033 Q Monrovia Q CA 91017-7133 Q (626) 303-5676 Page 2of 4...
  • Page 134 Lower the voltage or shorten the pulse width so that the optical parts will not be stained. Unitek Miyachi Lasers Q P. O. Box 5033 Q Monrovia Q CA 91017-7133 Q (626) 303-5676 Page 3of 4...
  • Page 135 (refer to Burn Pattern Adjustment as previously de- scribed in this chapter). Unitek Miyachi Lasers Q P. O. Box 5033 Q Monrovia Q CA 91017-7133 Q (626) 303-5676 Page 4of 4...

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