8 Muting Functions
To mute the primary safeguard appropriately, the design of a muting system must:
1.
Identify the non-hazardous portion of the machine cycle.
2. Select the proper muting devices.
3. Include proper mounting and installation of those devices.
The EZ-SCREEN LPM can monitor and respond to redundant signals that initiate the mute. The mute then suspends the
safeguarding function. This allows a person to interrupt the
defined area to load and/or unload parts or an object to pass
through the defined area of a safety light screen, without generating a stop command. (This should not be confused with
blanking, which disables one or more beams in a safety light screen, resulting in larger resolution.) See
Muting Timing
Sequences
(p. 62) for example mute timing sequences.
The mute may be triggered by a variety of external devices. This feature provides a variety of options to tailor the System to
the requirements of a specific application. A pair of muting devices must be triggered within 3 seconds of each other but
order does not matter. This reduces the chance of common mode failures or defeat.
Mute Configuration Options
Option Mute Time (Backdoor
Timer)
Bypass/Override Function Override Timeout Mute Enable
Function
Mute Delay Time
1 Infinite No N/A Yes N/A
2 60 seconds No N/A Yes N/A
3 Infinite Bypass 5 minutes No N/A
4 60 seconds Bypass 5 minutes No N/A
5 Infinite Mute-Dependent Override 60 seconds No N/A
6
11
60 seconds Mute-Dependent Override 60 seconds No N/A
7 60 seconds Mute-Dependent Override 60 seconds No 4 seconds
8 Infinite Bypass 5 minutes No 4 seconds
Note: See
Mute Configuration
(p. 38) for configuration procedure.
Note: Options 7 and 8 are intended for "Exit Only" applications and provides a 4 second mute off-delay
time. Once both mute devices are actuated within 3 seconds of each other, and the receiver is blocked,
the receiver OSSDs will remain ON for 4 seconds after the
first mute device (M1 or M2) is cleared, or until
the receiver defined area is clear, whichever comes first.
WARNING: Muting Limitations
Muting is allowed only during the nonhazardous portion of the machine cycle (ISO 13849-1 and ANSI
B11.19).
WARNING: Muting Inputs Must Be Redundant
Do note use a single switch, device, or relay with two N.O. contacts for the mute inputs. A single device,
with multiple outputs, may fail so that the System is muted at an inappropriate time. This could result in a
hazardous situation.
11
Factory default configuration
EZ-SCREEN Low-Profile System with Integral Muting
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