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APPENDIX
Safety distance CALCULATION
1. Vertical installation
- Properly install the light curtains in accordance with the user manual and applicable local
safety regulations (OSHA, ANSI, European standards as EN ISO 13855 “Safety of Machinery -
Positioning of safeguards with respect to the approach speeds of parts of the human body”).
- Consult DLIA Technical support before installing light curtains if you have questions, need
information or assistance about the products.
Failure to comply with these instructions could result serious injury
T1
Response time of the light curtain
T2
Machine stopping time
d
Resolution of the light curtain
K
Speed of the body or parts of the body (parameter given by the standard)
1.1 Equation for the calculation of the minimum distance
The detection zone is hortogonal to the direction of approach to the hazard zone
Fig. 3 – Minimum installation distance (vertical)
The positioning of light curtains and light grids must comply with the international standard EN ISO13855, that provides
a methodology to determine the minimum distance to a hazard zone from the detection zone, based on values for
approach speeds of parts of the human body.
If a type-C standard exists for the machine, the distance specified should be used. If there is no type-C standard, the
equations in EN ISO 13855 can be used to calculate it.
The factors to be taken in account are:
