Appendix B
MM-TA-12B Muting Module
Instruction Manual
Appendix B.
Typical Muting Applications
Entry/Exit Applications
The muting devices must be placed to ensure that the points that trigger the
mute’s start and end are very close to the safety light screen’s sensing field. This
prevents personnel from following, or being pushed by, the object into the haz-
ardous area without interrupting the safety light screen before the mute window
opens or at the time the mute window closes.
When two pairs opposed-mode photoelectrics are used as muting devices, as
shown below, the crossing point of the two sensing paths must be on the haz-
ardous side of the safety light screen. The safety light screen will be interrupted
before any personnel would be able to block both beams and mute the system.
The devices should detect the material and not the pallet or the transport in order
to hinder an individual from riding into the hazardous area.
Carrier
Basket
Safe Area
(free movement of personnel)
Hazardous Area
(which is being protected
from personnel entry)
Hard Guarding
Safety Mat or
Horizontal Mounted
Safety Light Screen
M1
M2
Light Screen
Receiver
Light Screen
Emitter
Figure B-1. “X”-Pattern Entry/Exit system using two pairs of opposed-mode photoelec-
tric muting devices
Figure B-2. Horizontal photoelectric muting
devices placed at different heights
Figure B-3. Photoelectric muting devices
placed diagonally
Light Screen
Defined Area
M1
(Emitter
Not
Shown)
M2
(Receiver)
M1
(Receiver)
M2
(Emitter
Not
Shown)
Light Screen
Defined Area
M1
(Emitter
Not
Shown)
M2
(Receiver)
M2
(Emitter
Not
Shown)
M1
(Receiver)
WARNING . . .
•
It must not be possible for an
individual to block both photo-
electric beams
(dashed diagonal
lines in Figure B-1)
and initiate a
mute condition.
Check the instal-
lation to verify that unintentional
muting is not possible. The
“crossing point” of the photoelec-
tric beams must be located in the
hazardous area and not be acces-
sible to personnel (by reaching
over, under, through, or around).
•
It must not be possible for per-
sonnel to walk in front of,
behind, or next to the muted
object (e.g., the carrier basket)
without being detected and stop-
ping the hazardous motion.
Supplemental safeguarding must
be used to prevent personnel
from entering the hazardous area
during a mute condition.
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