Banner MM-TA-12B Instruction Manual page 15

MM-TA-12B Muting Module
Instruction Manual
WARNING . . .
Muting Limitations
Muting is allowed only
during the non-hazardous portion
of the machine cycle (OSHA
1910.217(c)(3)(iii)(d), and ANSI
B11.19(1990) section 4.2.3.3.7).
WARNING . . .
User Is Responsible
for Safe Application
of this Product
The muting application examples
described in Appendix B depict
generalized guarding situations.
Every guarding application has a
unique set of requirements.
Extreme care is urged to ensure
that all legal requirements are met
and that all installation instruc-
tions are followed. In addition, any
questions regarding safeguarding
should be directed to the factory
applications department at the
number or addresses listed on the
front cover.
WARNING . . .
Guarding Multiple
Areas
DO NOT safeguard multiple areas,
with mirrors or multiple sensing
fields, if personnel can enter the
hazardous area while the System
is muted, and not be detected by
supplemental safeguarding that
will issue a stop command to the
machine (see Section 3.1.4, Pass-
Through Hazards).
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3.1.1 Muting Application Design
Following are typical applications where muting is used. See Appendix B for more
detailed information.
• Entry/Exit Applications. The muting devices are placed to allow the entry or
exit of a pallet or cart of work materials to enter or exit a workstation without
tripping the safety light screen, and without allowing the entrance of personnel
into the hazardous area.
• Home or Station Applications. The muting devices must be placed to mute the
safety light screen only when a hazard does not exist or is in another area —
so that personnel are not exposed to any hazard.
• Robot Load/Unload Station Application. The "Station" muting application uses
independent safety light screen circuits, each with its own muting circuit and
sensors to protect work locations. When a robot is active in Station A, for
example, Station B safety light screen is muted.
• Turret Table Application. A "Turret Table" application is similar to the Robot
Load/Unload Station muting application, except that any movement of the table
ends the mute.
• Power Press Applications. The muting devices are placed so that the mute is
initiated only during the non-hazardous, opening portion of the cycle (typically
the machine upstroke).
3.1.2 Use of Corner Mirrors with Optical Safety Systems
Mirrors are typically used with safety light screens and single-/multiple-beam
safety systems to guard multiple sides of a hazardous area. If the safety light
screen is muted, the safeguarding function is suspended on all sides. It must not
be possible for an individual to enter the guarded area without being detected and
a stop command issued to the machine control. This supplemental safeguarding
is normally provided by an additional device(s) that remains active while the
Primary Safeguard is muted and could be interfaced with the USSI input.
Therefore, mirrors are typically not allowed for muting applications.
3.1.3 Multiple Presence-Sensing Safety Devices (PSSDs)
Muting multiple PSSDs or a PSSD with multiple sensing fields is not recom-
mended unless it is not possible for an individual to enter the guarded area with-
out being detected and a stop command issued to the machine control. As with
the use of corner mirrors (see above), if multiple sensing fields are muted the
possibility exists that personnel could move through a muted area or access
point to enter the safeguarded area without being detected.
For example, in an entry/exit application where a pallet initiates the mute cycle by
entering a cell, if both the entry and the exit PSSDs are muted, it may be possible
for an individual to access the guarded area through the "exit" of the cell. An
appropriate solution would be to mute the entry and the exit with separate safe-
guarding devices.
System Installation