KEYENCE SL-C Series - Manual (Page 28)

Chapter 2 Installation and Assembly
2-6
2
English ENGLISH
2-2-1 ISO13855
zone is perpendicular to the direction of approach)>
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-C Series maximum response time (15 ms)
t2: Maximum time required by the machine to stop after receiving the signal from protective
equipment (SL-C)
C: Additional distance (mm) calculated from the SL-C 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
ISO13855 with K = 2,000 mm/s and C = 8 (d - 14 mm (0.55")). C is a value determined from
the d: SL-C Series detection capability diameter (mm) and must be equal or greater than 0.
This is the example when the SL-C**H is used.
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").
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").
* When the SL-C 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-C 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 SL-C**L is used or when the SL-C series other than SL-C**L is used with the
Intelligent Extension Unit (SL-R12EX) to activate the floating blanking function, the detection
capability will exceed 40 mm (1.57"). This section provides an example of the calculation
when using SL-C**L.
The safety distance is calculated using Formula (A) and the parameters established in
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").