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Automated Door
Hazardous Area
Light Screen Emitter
Light Screen Receiver
M1
M2
M3
M4
Figure 34. A home position (door) muting application, using 4 safety switches as muting devices
WARNING: User is Responsible for Safe Application of this Device
The muting application examples described in this manual depict generalized guarding situations. Every
guarding application has a unique set of requirements.
Make sure that all legal requirements are met and that all installation instructions are followed. Direct any
questions regarding safeguarding to Banner Engineering.
8.1.3 Robot Load/Unload Station Application
This station muting application uses two independent safety light screen circuits, each with its own muting circuit and
muting devices (for example, polarized-retroreflective photoelectrics). The application also includes run bars with two-hand
control, auxiliary controls, and E-Stop. The two-hand control is provided at each station to safeguard the operator during
the momentary clamping action of the fixture while the safety light screen is muted.
In this example, the safety light screens are angled outwards (see
(p. 58), detail A). This provides proper
separation distance from the hazards created by the robot and the clamping/welding fixtures, while protecting against the
possibility of pass-through hazards. In muting applications involving an operator, the operator must be continually
detectable by the defined area. This ensures that if a hazard arises, causing the mute to end while the operator is present,
the safety light screen will immediately issue a stop.
While the robot is at station A, the light screen at station B is muted (M1B and M2B are active), allowing the operator to load
or unload without issuing a stop command to the robot. As the robot moves out of the A work envelope (as defined by
Station B mute devices, see detail B) the mute discontinues at station B. If the operator is still within the protected area, a
stop command is immediately issued. As the robot moves to the work envelope of station B, the mute devices M1A and
M2A activate and mute the safety light screen at station A.
EZ-SCREEN Low-Profile System with Integral Muting
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