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KEYENCE GL-RHG Series User Manual

Page 54

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3-2

Safety Distances

3-6

GL-RHG-M-NO3-E

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Example 2 :ANSI B11.19-2010

Safety distance calculation according to ANSI B11.19-2010 (in a case where the protective zone is
perpendicular to the direction of approach)

Equation: Ds = (K × T) + Dpf

Ds : Safety Distance (inch)
K

: The maximum speed that an individual can approach the hazard

T

: The total time that it takes for the hazardous motion to stop, or for the hazardous portion

of the machine cycle to be completed. This value includes portions of time that vary by
machine type and by the safeguarding device applied.

Dpf : The distance (depth) penetration factor. This value varies depending on the GL-RHG

detection capability. Dpf=3.4 (S-0.275) inch. See the following figure.
Penetration factor, Dpf, for presence-sensing devices used in a vertical application with
object sensitivity less than 64 mm (2.5 inches)

One of the accepted values for K is the hand speed constant. (It is usually considered as the horizontal
motion of the hand and arm while seated). The common value is 1.6 m/s (63inch/s), although other values
(typically greater) are also used. The hand speed constant does not include other body movements, which
can affect the actual approach speed. Consideration for the above factors should be included when deter-
mining the speed constant for a given application. OSHA 1910.217(c) provides K = 63 inch/s (= 1,600 mm/s)
as a recommended value.

For more detailed information, such as calculating the value of "T", see ANSI B11.19-2010, Annex D.

0.0

25

(1.0)

50

(2.0)

76

(3.0)

102

(4.0)

127

(5.0)

152

(6.0)

178

(7.0)

64 (2.5)

51 (2.0)

38 (1.5)

25 (1.0)

13 (0.5)

0.0

Detection
capability:
S mm (inch)

Dpf=3.4 (S - 7) mm

(Dpf=3.4 (S - 0.275) inch)

Additional distance Dpf mm (inch)