1126800 SmartPAC 2 with WPC Integration
page 434 Appendix A Excerpts from OSHA Regulations and ANSI Standards
Extracts from ANSI B11.1-2001 8.5.3
Standard Requirements Explanatory Information
where
K = 63 inches/second (hand speed constant)
T
s
= the stop time of the press measured from
the final de-energized control element, usually
the air valve
T
c
= the response time of the press control
T
r
= the response time of the presence-sensing
device and its interface, if any, as stated by the
manufacturer or measured by the user.
T
bm
= the additional stopping time allowed by
the stopping performance monitor before it
detects stop time deterioration.
D
pf
= the added distance due to the penetration
factor as recommended in Figure 2. The
minimum object sensitivity is stated by the
manufacturer. If beam blankouts or floating
window features are used, these figures should
be added to the object sensitivity figure before
using the chart.
NOTE - T
s
+ T
c
= are usually measured by a
stop time measuring device.
See also, Annex C.
Whenever the press-cycle (stroke) STOP
command or stopping-performance monitor
time or angle setting is changed, the safety
distance should be recalculated. See also
Stopping-Performance Monitor (6.9)
NOTE – No increase in safety distance is
required for fixed blanking applications if the
blanked area is entirely occupied by the
material or fixtures.
In some instances, the use of blanking does not
allow efficient production of certain piece parts.
Horizontal placement of the sensing field, so
that it detects the operator's waist area, may
present a solution. In this application, the
operator may freely manipulate the workpiece
and operate the press as long as the operator
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