Banner EZ-SCREEN­ Safety Light Curtain Systems - Manual (Page 61)

page 61
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Safety Glossary
EZ-SCREEN Grid
Instruction Manual
Machine secondary control element (MSCE): A machine
control element independent of the Machine Primary
Control Element(s) (MPCEs), capable of removing the
source of power from the prime mover of the relevant
dangerous machine parts.
MPCE monitor contacts: The normally closed contacts of a
guarded machine’s MPCEs which are connected to the EZ-
SCREEN System EDM inputs. These contacts must be
mechanically linked to the control elements (forced-guided).
Muting: The automatic suspension of the safeguarding
function of a safety device during a non-hazardous portion
of the machine cycle.
OFF state: The state in which the output circuit is
interrupted and does not permit the flow of current.
ON state: The state in which the output circuit is complete
and permits the flow of current.
OSHA (Occupational Safety and Health Administration);
OSHA CFR 1910.217: Occupational Safety and Health Ad-
ministration (a US Federal agency), Division of the US
Department of Labor, that is responsible for the regulation
of workplace safety. OSHA regulations often follow ANSI
standards, including mechanical power press requirements
(OSHA CFR 1910.217). These regulations become law when
adopted by OSHA, and must be followed.
Output signal switching device (OSSD): The component of
the electro-sensitive protective equipment (ESPE)
connected to the control system of the machine which,
when the sensing device is actuated during normal
operation, responds by going to the OFF-state.
Point of operation: The area of the guarded machine where
a workpiece is positioned and a machine function (e.g.,
shearing, forming, punching, assembling, welding) is
performed upon it.
Protected height: The distance between the center of the
top beam and the center of the bottom beam of a light grid.
PSDI (Presence-Sensing-Device Initiation): An application
in which a presence-sensing device is used to actually start
the cycle of a machine. In a typical situation, an operator
manually positions a part in the machine for the operation.
When the operator moves out of the hazardous area, the
presence-sensing device starts the machine (no start switch
is used). The machine cycle runs to completion, and the
operator can then insert a new part and start another cycle.
The presence-sensing device continually guards the ma-
chine. Single break mode is used when the part is
automatically ejected after the machine operation. Double
break mode is used when the part is both inserted (to begin
the operation) and removed (after the operation) by the op-
erator. PSDI is defined in OSHA CFR 1910.217. Banner
EZ-SCREEN Systems may not be used as PSDI devices on
mechanical power presses, per OSHA regulation 29 CFR
1910.217.
Qualified Person: A person or persons who, by possession
of a recognized degree or certificate of professional training,
or who, by extensive knowledge, training, and experience,
has successfully demonstrated the ability to solve problems
relating to the subject matter and work.
Receiver: The light-receiving component of the EZ-SCREEN
Grid System, consisting of a grid of synchronized
phototransistors. The receiver, together with the emitter,
creates a vertical light grid used to detect a body or torso as
a person enters a hazardous area.
Reset: The use of a manually operated switch to restore the
OSSDs to the ON state from a lockout or a latch condition.
Self-checking (circuitry): A circuit with the capability to
electronically verify that all of its own critical circuit compo-
nents, along with their redundant backups, are operating
properly. Banner EZ-SCREEN Systems are self-checking.
Separation distance: That distance, along the direction of
approach, between the outermost position at which the ap-
propriate test piece will just be detected and the nearest
dangerous machine parts. Also called safety distance.
Single-stroke press: See full-revolution devices.
Supplemental guarding: Additional electrosensitive safety
device(s), and/or hard guarding measures, used for the
purpose of preventing a person from entering or remaining
in the hazard area undetected.
Test piece: An opaque object of sufficient size used to block
a light grid beam to test the operation of the EZ-SCREEN
Grid System.
UL (Underwriters Laboratory): A third-party organization
which tests a manufacturer’s products for compliance with
appropriate Standards, electrical and/or safety codes. Com-
pliance is indicated by their listing mark on the product.