Appendix B, Typical Muting Applications - Banner MMD-TA-11B Instruction Manual

Appendix B
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 hazardous
area without interrupting the safety light screen before the mute
window opens or at the time the mute window closes.
When two pairs of opposed-mode photoelectrics are used as
muting devices, as shown below, the crossing point of the two
sensing paths must be on the hazardous 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)
Carrier
Basket
Light Screen
Figure B-1. "X"-Pattern Entry/Exit system using two pairs of opposed-mode
photoelectric muting devices
M1
(Emitter)
Light Screen
M2
Defined Area
(Emitter
Not
Shown)
Figure B-2. Horizontal photoelectric muting
devices placed at different heights
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Light Screen
Receiver
M1
Hazardous Area
(which is being protected
from personnel entry)
M2
Safety Mat or
Horizontally Mounted
Emitter
Safety Light Screen
Hard Guarding
M1
M2
(Receiver
(Emitter
Not
Not
Shown)
Shown)
M2
M1
(Receiver)
(Emitter)
Figure B-3. Photoelectric muting devices
MMD-TA-11B / MMD-TA-12B Muting Module
WARNING . . .
• It must not be possible for an individual to block both
photoelectric beams (dashed diagonal lines in Figure
B-1) and initiate a mute condition. Check the installation
to verify that unintentional muting is not possible. The
"crossing point" of the photoelectric beams must be
located in the hazardous area and not be accessible to
personnel (by reaching over, under, through, or around).
• It must not be possible for personnel to walk in front
of, behind, or next to the muted object (e.g., the carrier
basket) without being detected and stopping the
hazardous motion. Supplemental safeguarding must be
used to prevent personnel from entering the hazardous area
during a mute condition.
Light Screen
Defined Area M1
(Receiver
Not
Shown)
M2
(Receiver)
placed diagonally
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