1107200
Shadow VI User Manual
page 110
Appendix A
Excerpts from OSHA Regulations and
ANSI
Standards
Daily Tests in French and English
Extracts from ANSI B11.19-2003 8.3
Standards Requirements
Explanatory Information
8.3.2.3
The presence-sensing device shall
protect individuals from hazards by initiating an
immediate stop command to the machine
control system when the sensing field of the
device is interrupted during the hazardous
portion of the machine cycle. It shall require
reinitiation of the normal actuating means prior
to the start or continuation of motion of the
machine.
When an individual can pass through the
sensing field of the presence-sensing device,
the device shall initiate an immediate stop
command to the machine control system and
shall require that the device or machine control
be manually reset before hazardous motion can
occur.
The operator should ensure that no individual is
in the safeguarded area before re-setting the
device or machine control and initiating
hazardous motion.
The reset device shall be located outside of the
safeguarded area such that it cannot be
reached from within the safeguarded area.
Reset of the device or machine control shall not
occur until verification that the safeguarded
area is clear of individuals.
Key lock reset switches located at various
positions around the safeguarded area may be
one method of accomplishing this requirement.
8.3.2.4
Components, subassemblies or
modules of the interface or machine control
system shall meet the requirements of 6.1.
8.3.2.5
Muting of the device shall be permitted
during the non-hazardous portion of the
machine cycle. Muting of the device shall be
accomplished such that a single failure of a
component, a subassembly or a module of the
system / device that affects the performance of
the safety-related functions shall not prevent a
normal stop command from being initiated, or
shall cause an immediate stop command. In
the event of a failure, re-initiation of the
machine shall be prevented until the failure is
corrected or the system or device is manually
reset.
E8.3.2.5
Muting is typically accomplished by
interface circuits or auxiliary controls. The
muting element should incorporate a similar
level of control reliability as the presence-
sensing device itself. A simple cam-operated
limit switch wired in parallel with the device's
output is inadequate, as its failure can remain
undetected.
In the presence of a failure, repetitive manual
reset of the system or device shall not be used
for production.
The intention of a manual reset is to encourage
the diagnosis of a failed component,
subassembly, device or module. A second
failure may occur during the diagnostic or
troubleshooting process, negating the safety
function(s). Additional safeguarding should be
used to protect individuals during this process.
See the definition for control reliability and
Summary of Contents for Shadow VI
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