Banner EZ-SCREEN­ Safety Light Curtain Systems - Manual (Page 56)

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P/N 68413
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
EZ-SCREEN Point
Instruction Manual
Glossary of Terms
Machine secondary control element (MSCE): A ma chine con trol
element in de pen dent 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 con nect ed 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 min is tra tion (a
US Federal agency), Division of the US De part ment of Labor, that
is re spon si ble for the regulation of workplace safety. OSHA reg u-
la tions often follow ANSI stan dards, in clud ing me chan i cal 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,
form ing, punch ing, 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-Sens ing-De vice Ini ti a tion): An ap pli ca tion 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. Sin gle break mode is used when the part is au to mat i cal ly
ejected after the machine operation. Double break mode is used
when the part is both in sert ed (to begin the operation) and removed
(after the op er a tion) by the op er a tor. PSDI is defined in OSHA
CFR 1910.217. Banner EZ-SCREEN Systems may not be used as
PSDI de vic es on mechanical power presses, per OSHA reg u la tion
29 CFR 1910.217.
Qualified Person: A person or persons who, by possession of a
rec og nized degree or certificate of professional training, or who, by
extensive knowl edge, training, and experience, has suc cess ful ly
dem on strat ed the ability to solve problems re lat ing to the subject
matter and work.
Receiver: The light-receiving component of the EZ-SCREEN Point
System, consisting of a synchronized phototransistor.
Reset: The use of a manually operated switch to restore the OSSDs
to the ON state from a lock out or a latch condition .
Self-checking (circuitry): A circuit with the capability to elec tron-
i cal ly verify that all of its own critical circuit com po nents, along
with their redundant backups, are operating prop er ly. Ban ner EZ-
SCREEN Systems are self-checking.
Separation distance: That distance, along the direction of
ap proach, between the out er most position at which the ap pro pri ate
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 the
light beam. in order to test the operation of the EZ-SCREEN Point
System .
UL (Underwriters Laboratory): A third-party organization which
tests a man u fac tur er’s products for com pli ance with ap pro pri ate
Standards, elec tri cal and/or safety codes. Com pli ance is indicated
by their listing mark on the product .