Honeywell SmartPAC 2 User Manual page 454

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Extracts from ANSI B11.1-2001 8.5.3
Standard Requirements
8.5.3.4 When the sensing field has been
interrupted, use of the normal press cycle
(stroke)-actuating means shall be required after
clearing the sensing field to resume press
operation.
8.5.3.6 Muting of the device shall be permitted
only during the non-hazardous portion of the
press cycle (stroke).
8.5.3.7 Muting of the device shall be
accomplished in a manner that conforms to the
requirements of 6.8 (and 8.7)
8.5.3.8 The device shall have an identifiable
minimum object sensitivity so that an
obstruction of an equal or greater size will be
detected anywhere within the sensing field
regardless of the plane of intrusion.
8.5.3.9 The device shall have a maximum
response time which shall not be affected by
object sensitivity adjustments or environmental
changes.
8.5.3.10 Devices which require adjustments to
accommodate variations in ambient or operating
conditions or which incorporate fixed blanking
or floating blanking features shall be designed
so that the adjustments or features are capable
of being supervised by the user.
page 432 Appendix A Excerpts from OSHA Regulations and ANSI Standards
SmartPAC 2 with WPC Integration
Explanatory Information
E8.5.3.6 Muting is typically accomplished by
interface circuits or auxiliary controls.
The die closing portion of the cycle (stroke) is
always considered hazardous. In some cases,
feeding and transfer automation or die features
can cause additional hazardous conditions even
during the opening portion of the cycle (up-
stroke).
See also, B11.19 for additional information.
E8.5.3.7 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
E8.5.3.8 The device should have a minimum
object sensitivity stated by the device
manufacturer. For example, electro-optical
devices may detect a 32 mm (1-1/4 inch)
diameter opaque object anywhere in its sensing
field but allow 25 mm (1 inch) obstructions to
pass undetected at certain points in the field.
E8.5.3.9 The device manufacturer should state
the maximum total response time, including
output devices, of the presence-sensing device.
E8.5.3.10 Typically, these adjustments or
controls are key-operated or located under
lockable covers.