Banner EZ-SCREEN­ Safety Light Curtain Systems - Manual (Page 69)

P/N 133487
67
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Overview
67
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
EZ-SCREEN
Instruction Manual
Glossary
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 danger 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 machine. 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 operator. PSDI is commonly confused with
“Trip Initiate.” PSDI is defined in OSHA CFR1910.217. Banner
safety light screen systems may not be used as PSDI devices
on mechanical power presses, per OSHA regulation 29 CFR
1910.217.
Qualified Person: An individual who, by possession of a
recognized degree or certificate of professional training, or by
extensive knowledge, training, and experience, has successfully
demonstrated the ability to solve problems relating to the subject
matter and work. (See Designated Person.)
Receiver: The light-receiving component of a safety light screen
system, consisting of a row of synchronized phototransistors.
The receiver, together with the emitter (placed opposite),
creates a “screen of light” called the defined area.
Reduced Resolution: A feature that allows a safety light
screen system to be configured to produce an intentionally
disabled light beam(s) within the light screen, which increases
the minimum object sensitivity. The disabled beam(s) appears
to move up and down (“float”) in order to allow the feeding of
an object through the defined area at any point without tripping
the safety outputs (e.g., OSSDs) and causing a Trip or Latch
condition. Sometimes called “Floating Blanking.”
Reset: The use of a manually operated switch to restore
the safety outputs to the ON state from a lockout or a Latch
condition.
Resolution: See Minimum Object Sensitivity.
Self-Checking (Circuitry): A circuit with the capability to
electronically verify that all of its own critical circuit components,
along with their redundant backups, are operating properly.
Banner safety light screen systems and safety modules are self-
checking.
Separation Distance (Safety Light Screen): The minimum
distance required to allow the machine’s hazardous motion
to stop completely, before a hand (or other object) can reach
the nearest hazard point. Measured from the midpoint of the
defined area to the nearest hazard point. Factors that influence
minimum separation distance include the machine stop time,
the light screen system response time, and the light screen
minimum object detection size.
Specified Test Piece: An opaque object of sufficient size used
to block a light beam to test the operation of a safety light
screen system. When inserted into any part of the defined area,
it will place a system into a Trip or Latch condition. Banner
supplies specified test pieces with each system. See also
Minimum Object Sensitivity.
Supplemental Guarding: Additional safeguarding device(s) or
hard guarding, used to prevent a person from reaching over,
under, through or around the primary safeguard or otherwise
accessing the guarded hazard.
Test Piece: An opaque object of sufficient size used to block a
light beam to test the operation of a safety light screen system.
Trip Condition: The response of the safety outputs (e.g.,
OSSDs) of a safety light screen system when an object equal
to or greater than the diameter of the specified test piece enters
the defined area. In a Trip condition, the OSSDs simultaneously
de-energize. A Trip condition clears (resets) automatically
when the object is removed from the defined area. (See Latch
Condition.)
Trip Initiate: The resetting of a safeguard causing the initiation
of machine motion or operation. Trip Initiate is not allowed
as a means to initiate a machine cycle per NFPA 79 and ISO
60204-1, and is commonly confused with PSDI.
UL (Underwriters Laboratory): A third-party organization
that tests products for compliance with appropriate standards,
electrical codes, and safety codes. Compliance is indicated by
the UL listing mark on the product.