Catalogs > Safety Products Catalog > Principles, Standards and Implementation > Safety Distance Calculation
Safety Distance Calculation
| Introduction |  |
Formula | |
Directions of Approach | |
Speed Constant | |
Stopping Time | |
Depth Penetration Factor | |
| Reach Through Applications | |
Single or Multiple Beams | |
Distance Calculations | |
Angled Approaches | |
Safety Mats | |
Examples | |
Example: An operator uses a normal approach to a 14 mm light curtain, which is connected to a monitoring safety relay which is connected to a DC powered contactor with a diode suppressor. The safety system response time, Tr, is 20 + 15 + 95 = 130 ms. The machine stopping time, Ts+Tc, is 170 ms. A brake monitor is not used. The Dpf value is 1 inch, and the C value is zero. The calculation would be as follows:
| Dpf = 3.4 (14 - 6.875) = 24.2 mm (1 in) C = 8 (14-14) = 0 | |
| Ds = K x (Ts + Tc + Tr + Tbm) + Dpf | S = K x T + C |
| Ds = 63 x (0.17 + 0.13 + 0) + 1 | S = 1600 x (0,3) + 0 |
| Ds = 63 x (0.3) + 1 | S = 480 mm (18.9 in) |
| Ds = 18.9 + 1 | |
| Ds = 19.9 in (505 mm) | |
Therefore, the minimum safe distance the safety light curtain must be mounted from the hazard is 508 mm (20 in.) for a machine to be used anywhere in the world.