Banner LS2e30-300Q8 Instruction Manual

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Banner LS2e30-300Q8 Instruction Manual Manual pdf 14 page image

ExamplesExample: U.S. Applications, ModelK = 63 in. per second (the hand speed constant set by OSHA)Ts = 0.32 (0.250 second is specified by the machinemanufacturer; plus 20% safety factor; plus 20 ms forinterface module IM-T-9A response time)Tr = 0.016 seconds (the specified response time of anLS2..30-600 EZ-SCREEN Type 2)Dpf = 3 inSubstitute the numbers into the formula as follows:Ds = K x ( Ts + Tr ) + DpfMount the EZ-SCREEN Type 2 emitter and receiver so that no part of thedefined area will be closer than 24.2 in. to the closest reachable hazardpoint on the guarded machine.Example: European Applications, ModelK = 1600 mm per secondT = 0.336 (0.250 second specified by machine manufacturer;plus 20% safety factor; plus 20 ms interface moduleresponse time), plus 0.016 seconds (the specifiedLS2..30-600 response time)C = 8 x (30 - 14) = 128 mm (14 mm resolution)Substitute the numbers into the formula as follows:S = (K x T ) + CS = (1600 x 0.336) + 128 = 665.6 mmMount the EZ-SCREEN Type 2 emitter and receiver so that no part ofthe defined area will be closer than 665.6 mm to the closestreachable hazard point on the guarded machine.3.1.2 Reducing or Eliminating Pass-Through HazardsA pass-through hazard is associated with applications where personnel may pass through a safeguard (which issues a stopcommand to remove the hazard), and then continues into the guarded area, such as in perimeter guarding. Subsequently,their presence is no longer detected, and the related danger becomes the unexpected start or restart of the machine whilepersonnel are within the guarded area.In the use of light screens, a pass-through hazard typically results from large safety distances calculated from longstopping times, large minimum object sensitivities, reach-over, reach-through, or other installation considerations. A pass-through hazard can be generated with as little as 75 mm (3 in) between the defined area and the machine frame or hard(fixed) guarding.Eliminate or reduce pass-through hazards whenever possible. While it is recommended to eliminate the pass-throughhazard altogether, this may not be possible due to machine layout, machine capabilities, or other applicationconsiderations.One solution is to ensure that personnel are continually sensed while within the hazardous area. This can be accomplishedby using supplemental safeguarding, such as described by the safety requirements in ANSI B11.19 or other appropriatestandards.An alternative method is to ensure that once the safeguarding device is tripped it will latch and will require a deliberatemanual action to reset. This method of safeguarding relies upon the location of the reset switch as well as safe workpractices and procedures to prevent an unexpected start or restart of the guarded machine.WARNING: Use of the Banner device for Perimeter GuardingIf a Banner device is installed in an application that results in a pass-through hazard (for example,perimeter guarding), either the Banner device System or the Machine Primary Control Elements(MPCEs) of the guarded machine must cause a Latched response following an interruption of thedefined area.The reset of this Latched condition may only be achieved by actuating a reset switch that is separatefrom the normal means of machine cycle initiation.Lockout/Tagout procedures per ANSI Z244.1 may be required, or additional safeguarding, as describedby ANSI B11.19 safety requirements or other appropriate standards, must be used if a passthroughhazard cannot be eliminated or reduced to an acceptable level of risk. Failure to observe thiswarning may result in serious bodily injury or death.EZ-SCREEN® Type 2 Light ScreenPhone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com