Banner MMD-TA-11B Muting Modules - Manual (Page 50)

48
P/N 116390 rev. C
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
MMD-TA-11B / MMD-TA-12B Muting Module
Instruction Manual
Appendix B
Automated
Door
Hazardous
Area
Light Screen
Emitter
Light Screen
Receiver
M1
M2
M3
M4
Figure B-6. A “home position” (door) muting application, using
4 safety switches as muting devices
Home or Station Applications
The muting devices must be placed to ensure that the safety
light screen is muted only when the hazard does not exist or is
in another area so that personnel are not exposed. The muting
devices must be placed so that if a hazard arises, or the hazard
enters the safeguarded area, the mute will immediately end and
the safeguard will be active once again.
In “home position” muting applications, the light screen is active
only while motion is taking place or a hazard is present, such
as the closing of an automated door. In this example, the door
is interlocked and the machine can not start until the opening
is completely closed. The hazard being guarded by the light
screen is the pinch point caused by the door closing.
M3 and M4 could be two SI-QS75MC safety switches, each
with a single safety contact used for the muting input. M1 and
M2 could be SI-QS90MF safety switches, each with two safety
contacts (one for muting and one for interlocking) and one
monitoring contact for a logic input.
If the light screen is also guarding hazards within the enclosure
when the door is open or preventing cycle initiation, then
switches M3 and M4 would not be used. The door could also be
“locked” by using locking style safety switches, such as the
SI-QM100 or SI-LS42 as M1 and M2.
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
application requirements. Extreme care is urged to ensure
that all legal requirements are met and that all installation
instructions are followed.
In addition, any questions regarding safeguarding should
be directed to the factory applications department at the
telephone number or addresses listed on the back cover.