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Pangolin PASS User Manual

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2022/07/28 09:15
PASS
Professional Audience Safety System
User Manual for PASS version 1.5 March 2015
Important Information
PLEASE READ THIS ENTIRE MANUAL VERY CAREFULLY, INCLUDING THE LICENSE AGREEMENT AND
LIMITED WARRANTY FOUND IN THE BACK OF THIS MANUAL. FAILURE TO FOLLOW THESE INSTRUCTIONS
VERY CAREFULLY COULD LEAD TO AN INCREASED RISK OF AN UNSAFE LASER EXPOSURE.
This manual contains important information on how to install PASS in a laser projector, how to perform
adjustments, and how to make sure that the show remains safe – including a requirement to test your
laser projectors before each show and log the test results.
Introduction
Congratulations on selecting Pangolin's Professional Audience Safety System, an important step toward
helping to keep your audiences safe from the potential hazards that laser projection systems may pose.
You have purchased a powerful and patented laser projector safety monitoring system for laser light
show usage.
Complete Help Docs - https://wiki.pangolin.com/
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Summary of Contents for Pangolin PASS

  • Page 1 VERY CAREFULLY COULD LEAD TO AN INCREASED RISK OF AN UNSAFE LASER EXPOSURE. This manual contains important information on how to install PASS in a laser projector, how to perform adjustments, and how to make sure that the show remains safe – including a requirement to test your laser projectors before each show and log the test results.
  • Page 2 Pangolin software, can assist in maintaining the safety of Audience Scanning laser shows. PASS is barely bigger than a credit card, and yet it includes a set of very sophisticated and complete protection systems. PASS hardware is designed with multiple levels of redundancy and with circuitry that is designed to fail- safe.

  • Page 3: Brief Theory Of Operation

    Dwell Time (the time that a beam may remain at or below the minimum velocity see page), PASS will blank (pull to zero volts) all color signals and the intensity signal. PASS will only do this for the period of time that the beam is below the “Minimum Velocity”. As soon as the beam speeds back up, or the beam enters a non-protected area (i.e.
  • Page 4 PASS as a measure of redundancy. If there is an effect that is scanning very quickly, and which would satisfy the “Minimum Velocity”, but if this is a very small effect, PASS will blank the color and intensity signals until the Effect Size resumes a safe level.

  • Page 5: Layout And Connections

    PASS, nor are there any microprocessors, which could not be fully validated. In addition to the logic used by PASS to implement the basic safety features, PASS also includes a separate layer or logic that actually watches the first logic layer, and verifies sanity. If there is a problem within the PASS logic, the color and intensity signals are blanked, the shutter is closed, and the projector interlock signal path is opened.
  • Page 6 Pins 7 and 8 correspond to the Projector Interlock loop pins 4 and 17 from the ILDA connector. Note that PASS will interrupt this interlock signal loop in the event of a critical fault and when power is insufficient, therefore it is MANDATORY that projector manufacturers implement an interlock scheme that makes use of these signals.
  • Page 7 It is recommended that this pin be left unconnected. Pin 24 is connected to the ground connection of PASS. It is recommended that this only be used as a ground reference for the shutter driver, and nothing else.
  • Page 8 Pin 5 is an active input that indicates that a control panel is being used. Pin 5 must be connected to Pin 6 when a control panel is used. If Pin 5 is not connected to Pin 6, then PASS will not wait for a manual reset when power is first applied.
  • Page 9 Pin 16 is a “Status LED number 1”. If this signal is LOW, it indicates that a power supply fault has been detected. Pin 18 is a “Status LED number 2”. If this signal is LOW, it indicates that the PASS light sensor detected a light level that exceeded the “Maximum Safe Light Level” while the Y position was below the horizon.
  • Page 10 Pin 20 is a “Status LED number 3”. If this signal is LOW, it indicates that PASS tried to extinguish light from coming out of the projector, but that the PASS light detector still detected light output. This would occur if a PCAOM or Laser Diode Driver continued to output light after being told not to.
  • Page 11 Note that each scanner amplifier, as well as the PASS circuit board itself must each have their own power wires going back to the power supply. These wires should all meet at the power supply itself. If you have two power supplies (one for +24V and the other for –24V) then these power supplies should establish a...
  • Page 12 With the PASS board in the physical orientation shown above, Switch 3 is next in line. When this switch is moved to the left (on), the Horizon control is monitored and PASS will only allow static or slow beams above the horizon. If there is a slow-moving, or non-moving beam below the horizon, it will be extinguished by PASS.
  • Page 13 The Minimum Velocity controls the minimum speed that the beam is required to sweep, in X and/or Y, in order to be considered to be safe. At the factory, Pangolin sets this to around 5 radians per second. Note that the scale of this control (in radians per second) depends on the actual position scale factor of the scanner amplifier being used.
  • Page 14 – rather than potentiometers that might reside on the back of a laser projector. First, set PASS Switch 3 to “Protect only the bottom portion” (switch moved to the left, if the board is https://wiki.pangolin.com/...
  • Page 15 The circle should be somewhere between 50% and 100% size for this test. Note that while doing this and if PASS is not set correctly, the laser beam will probably be allowed to enter the audience area. Therefore it is once again important to make sure there are no untrained or non-technical personnel present in the room during this setup.
  • Page 16 Step 3: Enable the light sensor, and adjust the Maximum Beam Power potentiometer Adjust the Maximum Beam Power potentiometer on PASS, many turns clockwise. The idea is to set this to a level that won’t immediately trip once you enable it using Switch 4.
  • Page 17 Step 4: Set PASS Switch 3 to the desired position If it is your intention for PASS to protect the entire scan field, then now would be the time to move Switch 3 “Protect entire scanfield” position (to the right). Otherwise you can simply leave the switch where it is.
  • Page 18 (or Pangolin software abstract generator) until you get to a pulse width of 1 millisecond. Generally, PASS should be adjusted to extinguish the laser beam for pulse widths greater than 1 millisecond. If you are able to slow down the function generator to obtain longer pulses, then this means that the MINIMUM VELOCITY adjustment on PASS must be increased (turned clockwise).
  • Page 19 45-degree (or so) angle, and direct a small portion of the laser beam to light-sensitive material. The light sensor used with PASS must be a relatively fast sensor – one that is able to react as quickly as the light can be modulated. Generally this means that the light-sensor must be based on silicon photodiode or silicon PIN photodiode type technology.
  • Page 20 Using a light sensor with PASS can be tricky. When you enable the light sensor feature in PASS, everything must be at least ready to operate correctly. Otherwise PASS will detect problems and “trip” –...
  • Page 21 While drafting variances for audience scanning, and for general knowledge of what PASS does and how it works, some people have found it handy to refer to the Patents on PASS. The issued US patent can be found on the USPTO web site, or on Google Patents. It is called “Laser projector safety monitoring system”...
  • Page 22 Of course the adjustments on PASS must be configured properly, for the scanning velocity and dwell time as well as the projection horizon (if used). Moreover, the light-sensor-related adjustments on PASS must be configured to monitor the minimum beam power of the laser (to ensure proper light sensor and laser...

  • Page 23: Dimensions And Mounting Holes

    2022/07/28 09:15 23/26 PASS Dimensions and mounting holes Complete Help Docs - https://wiki.pangolin.com/...

  • Page 24: License Agreement And Limited Warranty

    Agreement provides you with the authorization to use PASS subject to the terms and conditions herein. If you do not agree to all the terms and conditions of this Agreement, do not use PASS. If you proceed to use PASS, you thereby signify that you have agreed to all of the terms and conditions set forth below.
  • Page 25 Pangolin as a result of injury caused by your use of the PASS in a manner that is not in strict accordance with Pangolin’s instructions or documentation including this Agreement, and you agree to pay all damages awarded or agreed to under a settlement of such claim (provided, however, you may not enter into any settlement that imposes a financial obligation or admission of...
  • Page 26 Due to our policy of continuous product improvement, information in this manual is subject to change without notice. NOTICE: The electronic circuit design of PASS as well as concepts embodied within it, are protected by U.S. and Australia patents. Due to our policy of continued product development in the area of laser safety, other patents may also be pending.