KEYENCE GL-RHG Series User Manual
Page 53
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Safety Distances
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Example 1: ISO13855 (EN ISO13855)
Safety distance calculation according to ISO13855:2010 (EN ISO1385:2010) (in a case where the
protective zone is perpendicular to the direction of approach)
Equation A: S = (K × T) + C
S : Safety distance (mm)
K : Approach speed of the body or parts of the body into the protective zone (mm/s)
T : Overall system stopping performance (s) (T= t1 + t2)
t1 : GL-RHG maximum response time
"Response time (OSSD)" (page 7-5)
t2 : Maximum time required by the machine to stop after receiving a signal from the protective
equipment (GL-RHG), (s)
C : Additional distance (mm) calculated from the GL-RHG detectable capability. See example
below.
Calculation example for a detection capability of 40 mm (1.57") or less
The safety distance is calculated using Equation (A) and the parameters established in ISO13855 (EN
ISO13855) with K = 2,000 mm/s and C = 8 (d - 14 mm). C is a value determined according to the
GL-RHG detection capability diameter (mm), (d). The value (d) must be great than or equal to 0. This
section provides an example of the calculation when using the GL-R08HG (8 beam axes) which oper-
ates in wire synchronization system.
Equation B: S = 2,000 mm/s × (t1 + t2) + 8 (d - 14 mm)
t1 = 6.6 ms and d = 25 mm according to the specification, and if t2 = 50 ms:
S = 2,000 mm/s × (0.0066 s + 0.05 s) + 8 (25 mm – 14mm) = 201.2 mm (7.92")
The safety distance calculated using the above Equation (B) must be 100 mm (3.94") or more.
(From ISO13855 Clause 6.2.3 and EN ISO13855 Clause 6.2.3)
If on the other hand the safety distance calculated using the above Equation (B) exceeds 500 mm
(19.69"), set K = 1,600 mm/s and calculate the safety distance again using Equation (A).
If the calculated safety distance is less than 500 mm (19.69"), you still must use a safety distance of S
= 500 mm (19.69"). (From ISO13855 Clause 6.2.3 and EN ISO13855 Clause 6.2.3)