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Safety Mat Safety Distance (Minimum Distance)
As a stand-alone safeguard, the safety mat must be installed at a safety
distance (minimum distance) so that the exterior edge of the sensing
surface is at or beyond that distance, unless it is solely used to prevent
start/restart, or solely used for clearance safeguarding (see ANSI
B11.19, ANSI/RIA R15.06, and ISO 13855).
The safety distance (minimum distance) required for an application
depends on several factors, including the speed of the hand (or
individual), the total system stopping time (which includes several
response time components), and the depth penetration factor. Refer to
the relevant standard to determine the appropriate distance or means to
ensure that individuals cannot be exposed to the hazard(s).
Hazardous
Zone
or
Area
Safety Mat
Ds
K(Ts + Tr)
Dpf
Figure 59. Determining safety distance for the safety
mat
U.S. Applications
The Safety Distance formula, as provided in ANSI B11.19:
Ds = K x (Ts + Tr) + Dpf
Ds
the Safety Distance (in inches)
Tr
the response time of the Safety Controller as measured from the time a stop signal from either hand control. The Safety Controller response
time is obtained from the Configuration Summary in the PC Interface.
K
the OSHA/ANSI recommended hand-speed constant (in inches per second), in most cases is calculated at 63 in/sec, but may vary between 63
in/sec to 100 in/sec based on the application circumstances;
not a conclusive determination; consider all factors, including the physical ability of the operator, when determining the value of K to be used
Ts
the overall stop time of the machine (in seconds) from the initial stop signal to the final ceasing of all motion, including stop times of all
relevant control elements and measured at maximum machine velocity
Ts is usually measured by a stop-time measuring device. If the specified machine stop time is used, add at least 20% as a safety factor to
account for brake system deterioration. If the stop-time of the two redundant machine control elements is unequal, the slower of the two times
must be used for calculating the separation distance
Dpf
the added distance due to the penetration depth factor
equals 48 in, per ANSI B11.19
European Applications
The Minimum Distance Formula, as provided in ISO 13855:
S = (K x T) + C
S
the Minimum Distance (in millimeters)
K
the ISO 13855 recommended hand-speed constant (in millimeters per second), in most cases is calculated at 1600 mm/sec, but may vary
between 1600 to 2500 mm/sec based on the application circumstances;
· not a conclusive determination; consider all factors, including the physical ability of the operator, when determining the value of K to be used.
T
the overall machine stopping response time (in seconds), from the physical initiation of the safety device to the final ceasing of all motion
C
the added distance due to the depth penetration factor equals 1200 mm, per ISO 13855
Safety Mat Hookup Options
Pressure-sensitive mats and pressure-sensitive floors must meet the requirements of the category for which they are
specified and marked. These categories are defined in ISO 13849-1 (EN 954-1).
XS/SC26-2 Safety Controller
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Содержание SC26-2 Series
Страница 1: ...XS SC26 2 Safety Controller Instruction Manual Original Instructions 174868 Rev E 20 June 2014 174868 ...
Страница 58: ...Figure 49 Run Time Equipment view Figure 50 Run Time Functional View XS SC26 2 Safety Controller 58 ...
Страница 62: ...Figure 54 Sample Configuration Functional View XS SC26 2 Safety Controller 62 ...