Appendix B, Typical Muting Applications - Banner MM-TA-12B Instruction Manual

MM-TA-12B Muting Module
Instruction Manual
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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Appendix B.
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.
Safe Area
(free movement of personnel)
Figure B-1. "X"-Pattern Entry/Exit system using two pairs of opposed-mode photoelec-
tric muting devices
M1
(Receiver)
Light Screen
M2
Defined Area
(Emitter
Not
Shown)
Figure B-2. Horizontal photoelectric muting
devices placed at different heights
Typical Muting Applications
M1
Carrier
Basket
M2
Light Screen
Emitter
M2
M1
(Emitter
(Emitter
Not
Not
Shown)
Shown)
M1
M2
(Receiver) (Receiver)
Figure B-3. Photoelectric muting devices
Appendix B
Light Screen
Receiver
Hazardous Area
(which is being protected
from personnel entry)
Safety Mat or
Horizontal Mounted
Safety Light Screen
Hard Guarding
Light Screen
Defined Area M1
(Emitter
Not
Shown)
M2
(Receiver)
placed diagonally