Banner MMD-TA-11B Muting Modules - Manual (Page 55)

P/N 116390 rev. C
53
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
MMD-TA-11B / MMD-TA-12B Muting Module
Instruction Manual
Glossary of Terms
Hazard Point: the closest reachable point of the hazardous
area.
Internal Lockout: a Lockout condition that is due to an internal
safety system problem. Generally, indicated by the red Status
indicator LED (only) flashing. Requires the attention of a
Qualified Person.
Key Reset (Manual Reset): a key-operated switch used to
reset a safety light screen system to the ON state following a
Lockout condition. Also refers to the act of using the switch to
reset a safety system from a Latch condition.
Latch 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 Latch condition, safety outputs
simultaneously de-energize and open their contacts. The
contacts are held (latched) open until the object is removed from
the defined area and a manual reset is performed. A latching
output is used most often in perimeter guarding applications.
(See Trip Condition.)
Lockout Condition: a safety light screen system condition that
is automatically attained in response to certain failure signals
(an internal lockout). When a Lockout condition occurs, the
safety light screen system’s safety outputs turn OFF, and a
manual reset is required to return the system to RUN mode.
Machine Operator: an individual who performs production work
and who controls operation of the machine.
Machine Primary Control Element (MPCE): an electrically-
powered element, external to the safety system, which directly
controls the machine’s normal operating motion in such a way
that the element is last (in time) to operate when machine
motion is either initiated or arrested.
Minimum Object Sensitivity (MOS): the minimum-diameter
object that a safety light screen system can reliably detect.
Objects of this diameter or greater will be detected anywhere in
the defined area. A smaller object can pass undetected through
the light if it passes exactly midway between two adjacent light
beams. Also known as MODS (Minimum Object Detection Size).
See also Specified Test Piece.
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): a
U.S. Federal agency, Division of the U.S. Department of Labor,
that is responsible for the regulation of workplace safety.
OSSD: Output Signal Switching Device. The safety outputs that
are used to initiate a stop signal.
Pass-Through Hazard: A situation that may exist when
personnel pass through a safeguard (at which point the hazard
stops or is removed), and then continue into the guarded area.
At this point the safeguard may not be able to prevent an
unexpected start or restart of the machine with personnel within
the guarded area.
Point of Operation: the location of a machine where material or
a workpiece is positioned and a machine function is performed
upon it.
Point-of-Operation Guarding: safeguards, such as hard
guards or safety light screens, which are designed to protect
personnel from hazardous machine motion when close to the
machine’s point of operation.
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.
Reset: The use of a manually operated switch to restore
the safety outputs 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 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.