KEYENCE SL-CHG Series - Manual (Page 25)

Chapter 2 Installation and Assembly
2-7
2
ENGLISH
2-2-3 EN999 (ISO13855)
approach into detection zone)>
Formula: S = K x T + C..... (A)
S: Safety distance (mm)
K: Approaching speed of the body or the parts of body into detection zone (mm/s)
T: Overall response time (s) (T= t1 + t2)
t1: SL-CHG Series maximum response time (15 ms)
t2: Maximum time required by the machine to stop after receiving the signal from protective
equipment (SL-CHG)
C: Additional distance (mm) calculated from the SL-CHG detection capability.
[Calculation example for a detection capability of 40 mm (1.57") or less]
The safety distance is calculated using Formula (A) and the parameters established in
EN999 (ISO13855) with K = 2,000 mm/s and C = 8 (d - 14 mm (0.55")). C is a value
determined from the d: SL-CHG Series detection capability diameter (mm) and must be
equal or greater than 0.
S = 2,000 mm/s x (t1 + t2) + 8 (d - 14 mm (0.55"))..... (B)
When t1 = 15 ms, t2 = 50 ms, d = 25 mm (0.98"):
S = 2,000 mm/s x (0.015 s + 0.05 s) + 8 (25 mm (0.98") - 14 mm (0.55"))
= 218 mm (8.58")
* The safety distance calculated using Formula (B) above must be 100 mm (3.94") or
more and 500 mm (19.69") or less. When the calculated safety distance is less than
100 mm (3.94"), use a safety distance of S = 100 mm (3.94"). Accordingly, the
safety distance acquired from Formula (B) above is S = 218 mm (8.58"). (From
EN999 Clause 6.1.1 and ISO13855 Clause 6.1.1)
If on the other hand the safety distance calculated using Formula (B) above
exceeds 500 mm (19.69"), set K = 1,600 mm/s and calculate the safety distance
again using Formula (A).
S = 1,600 mm/s x (t1 + t2) + 8 (d - 14 mm (0.55"))..... (C)
When t1 = 15 ms, t2 = 300 ms, d = 25 mm (0.98"):
S = 1,600 mm/s x (0.015 s + 0.3 s) + 8 (25 mm (0.98") - 14 mm (0.55"))
= 592 mm (23.31")
* The safety distance calculated using Formula C above must be 500 mm (19.69") or
more. When the calculated safety distance is less than 500 mm (19.69"), use a
safety distance of S = 500 mm (19.69"). Accordingly, the safety distance acquired
from Formula (C) above is S = 592 mm (23.31"). (From EN999 Clause 6.1.1 and
ISO13855 Clause 6.1.1)
* When the SL-CHG is being used in a non-industrial application, the minimum safety
distance is calculated by adding 75 mm (2.95") to the result from Formula (B).
Formula (C) cannot be used in this situation. Accordingly, when the SL-CHG is used
in a non-industrial application, a safety distance of S = 218 mm (8.58") + 75 mm
(2.95") = 293 mm (11.54") is required.
[Calculation example for a detection capability of 40 mm (1.57") or more and 70 mm (2.76") or
less]
When the Intelligent Extension Unit (SL-R12EX) has been used to activate the floating
blanking function, the detection capability will exceed 40 mm (1.57"). This section provides
an example of the calculation used when the floating blanking 1 function has been selected.
(For more information about the floating blanking function, see the SL-R12EX instruction manual.)
The safety distance is calculated using Formula (A) and the parameters established in
EN999 (ISO13855) with K = 1,600 mm/s and C = 850 mm (33.46").
S = 1,600 mm/s x (t1 + t2) + 850 mm (33.46")
When t1 = 15 ms, t2 = 50 ms,
S = 1,600 mm/s x (0.015 s + 0.05 s) + 850 mm (33.46")
= 954 mm (37.56")
Accordingly, the safety distance for this application is S = 954 mm (37.56").