1128600
SmartPAC 2 with WPC 2000 Integration User Manual
6-24
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ANSI and OSHA Safety Distance Formulas
Occupational Safety and Health Administration (OSHA) regulations and American National
Standards Institute (ANSI) standards mandate that all machine safeguarding devices,
including Shadow light curtains, be located at the correct safety distance from the pinch point.
OSHA regulation 1910.217 governs the mounting of infrared light curtains to protect
mechanical power presses. Wintriss recommends, however, that you use the formula in ANSI
standard B11.1-2009 when calculating safety distance. The ANSI formula has been
developed specifically for guarding of mechanical power presses and includes more factors,
such as brake monitor setting, object sensitivity, and depth penetration factor, than the OSHA
formula. The B11.1-2009 formula represents a new consensus among manufacturers on the
proper installation of light curtains.
ANSI and OSHA formulas are documented in the following sections. For complete
information on OSHA regulation 1910.217 and ANSI standards B11.1-2009 and
B11.19-2003, see Appendix A.
The ANSI Safety Distance Formula
PRESS MAY NOT STOP BEFORE OPERATOR REACHES PINCH POINT
• Calculate the safety distance carefully according to the instructions below.
• Mount your light curtain heads at least the safety distance from the hazardous area. If a light
curtain is too close to the hazard, there may not be enough time for the press to stop before the
operator’s hand (or another object) reaches the hazard.
• Mount your Two-hand Control, if you are using it as a safety device, at least the safety distance
from the hazardous area. If the Two-hand Control is too close to the hazard, there may not be
enough time for the press to stop before the operator’s hand (or another object) reaches the
hazard.
• Call Wintriss Tech. Support if you are not sure how to calculate the safety distance.
Failure to comply with these instructions will result in death or serious injury.
OBSERVE THE CORRECT SAFETY DISTANCE
• Calculate the safety distance carefully according to the instructions below, and mount your light
curtain heads at least the calculated distance from the hazardous area.
• Mount your light curtain heads at least 7.5 in. (191 mm) from the hazardous area, regardless of
the calculated safety distance.
• Be sure your value for Ts (i.e., stopping time) includes the response times of all devices that
react to stop the press. If your measurement for stopping time does not include the response
times of the press control, light curtain, and any other devices that react to stop the press, the
safety distance will be too short.
Failure to comply with these instructions will result in death or serious injury.
DANGER
!
DANGER
!
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