Honeywell SmartPAC 2, User Manual, Page: 453 / 522

SmartPAC 2 with WPC Integration 1126800
Excerpts from OSHA Regulations and ANSI Standards Appendix A page 431
Section 2 ANSI Standards for Presence-sensing
Devices
ANSI Standards for Two-hand Controls
Reprinted below are the American National Standards Institute (ANSI) standards for
presence-sensing devices (light curtains). Also included is Section 8.5.3 on two hand
controls. ANSI is the United States clearinghouse and coordinating body for voluntary
standards activity on the national level. It is a federation of trade associations, technical
societies, professional groups, and consumer organizations. Some 1000 companies are
affiliated with the Institute as company members.
ANSI creates voluntary standards to eliminate duplication and to weld conflicting standards
into single, nationally accepted standards under the designation “American National
Standards.” The standards reflect a national consensus of manufacturers; consumers;
scientific, technical, and professional organizations; and governmental agencies.
The ANSI standards below are American National Standard Institute B11.1-2001 for
presence-sensing devices (light curtains) and two hand controls. Both the ANSI standard and
its interpretation are part of ANSI standard B11.1-2001. To get a complete copy of the ANSI
standard, write to: ANSI, 1430 Broadway, New York, NY 10018.
Extracts from ANSI B11.1-2001 8.5.3
Standard Requirements Explanatory Information
8.5.3 Presence-sensing safeguarding device
8.5.3.1 A presence-sensing point-of-operation
device, when used for safeguarding, shall protect
the operator as specified in 8.5.1 (a);
E8.5.3.1 Various presence-sensing devices
employ different sensing and adjustment
techniques. The point at which a device
responds to an intrusion can vary.
8.5.3.2 The device shall be interfaced with the
control circuit to prevent or stop slide motion if
any object is within the sensing field of the
device during the hazardous portion of the cycle
(stroke.)
8.5.3.3 The device shall not be used for
safeguarding the point of operation on presses
using full-revolution clutches.
E8.5.3.2 The device should be located or
adjusted so that the device always responds to
the intrusion at or prior to the safety distance
(Ds).
Also, care should be taken when installing the
device so that it does not detect false signals
from other devices or equipment in the area.
The presence –sensing device cannot protect
against a mechanical failure, which causes
unintended cycling (stroking) action. See figure
A.3.