WPC 2000 User Manual 1128500
Extracts from OSHA and ANSI A-17
When the device is bypassed, other
safeguarding must be provided and used.
When bypassed, the device's normal status
indicators can be misleading if still active. One
method that may be used to meet this
requirement is to remove power to the device or
to disable the normal status indicators when it is
bypassed or not being used.
Due to the prevalence of color blindness,
methods such as unambiguous positioning,
patterning, labeling or flashing of the indicators
may be effective in providing the indication
required.
8.3.2.7 The radio frequency device shall not be
adversely affected by changes around the
machine that may alter the sensitivity of the
device such that individuals are no longer
detected in the sensing field at the proper safety
distance.
E8.3.2.7 The radio frequency device may be
affected by changes in the conditions around the
machine such as ambient conditions, the
placement of parts and tote boxes, grounding
conditions of the operator, or the movement of
industrial trucks. These changes should not
adversely affect the performance of the device.
8.3.2.8 The total tolerance in the range
measurement of an area scanning device shall
be included in determining the distance from the
nearest recognized hazard to the detection area
or zone. This detection area shall be identified
and tested to ensure that the device is able to
detect individuals entering the detection area.
The effective sensing field shall be verified for
proper size and coverage upon installation,
replacement, or changes of the detection area.
E8.3.2.8 When the device is horizontally
mounted, the detection area or zone should be
visibly marked on the floor. This verification can
be accomplished by using a programming
device or by physically identifying the perimeter
of the detection area with an appropriate test
rod, following the supplier's recommendation.
This verification is to ensure that a pre-
programmed device with a small or improper
detection area is not used by mistake in an
installation requiring a larger field.
Area scanners may not be suitable (effective)
safeguards when used to protect an individual's
hands or fingers from hazards.
Items which can affect this suitability are:
response time;
minimum object sensitivity;
measurement accuracy.
Extracts from ANSI B11.19-2003 8.3
Standards Requirements Explanatory Information
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