ISO 13855:2010 pdf free download – Safety of machinery一Positioning of safeguards with respect to the approach speeds of parts of the human body.
That means, where the height of the detection zone is known or fixed, a maximum sensor detection capability can be calculated.
For example, when calculating the horizontal section of L-shaped electro-sensitive protective equipment or if a sensor detection capability is known or fixed, a minimum height can be calculated, up to the allowable maximum of 1 000 mm.
When using the device as both a trip and presence-sensing device, the distance X (see Figure 4) shall not be less than the detection capability, d.
Measures shall be applied so that the protective devices cannot be used to gain access to the hazard zone (e.g. by stepping or climbing on the housing).
6.4 Detection zone angled to the direction of approach
If the detection zone has been installed such that it is angled greater than ± 30° of the direction of approach, it shall be treated as an orthogonal approach [see 6.2 and Figures 5 a) and 6].
If the detection zone has been installed such that it is angled less than ± 300 of the direction of approach, it shall be treated as a parallel approach [see 6.3 and Figures 5 b) and 6].
A tolerance of ± 5° should be used for these angles.
6.5 Addressing possible circumventing of electro-sensitive protective equipment by reaching over the detection zone
6.5.1 General
Access to the hazard zone by circumventing of the electro-sensitive protective equipment shall be avoided. NOTE This can be achieved by the provision of guards or other protective measures.
If access to the hazard zone by reaching over the detection zone of vertically mounted electro-sensitive protective equipment cannot be excluded, the height and the minimum distance, S, of the safeguard shall be determined. S shall be determined by comparison of the calculated values in 6.2 and 6.3 based on the approach of limbs or parts of the body and the values for reaching over determined in 6.5.2, 6.5.3 and 6.5.4. The greater value resulting from this comparison shall be applied.
6.5.2 Prevention of reaching over a vertical detection zone of electro-sensitive protective equipment without an additional protective structure
The minimum distance, 5, in millimetres from the detection zone to the hazard zone for prevention of circumventing by reaching over the ESPE shall not be less than that calculated using Equation (10).
For CRC, the values in Table I shall apply. CR0 is given in this table as the additional distance in millimetres, based on the distance which a part of the body (usually a hand) can move towards the hazard zone prior to the actuation of the electro-sensitive protective equipment. Table 1 only deals with reaching over the detection zone of the ESPE.
Figure 8 illustrates reaching over a vertical detection zone without an additional protective structure.
Where the height of an ESPE is already fixed, Table 1 can be used to derive the minimum distance, S. Where the minimum distance is already fixed, Table I can also be used to derive the required height of the ESPE.