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6 Muting
General information about the three functions
The functions muting, override (see 7), and blanking (see 9) make it possible to bypass the barrier, or parts
of it, when the operational mode allows this.
The barrier, by the demands in the given standard, is equipped with inputs that are necessary for these
functions to be activated. It is important, however, to note that these functions bypass parts of the protective
function, so it is essential that they are used only if the risk assessment shows that it is appropriate.
6.1 Muting, Installation
The muting function is made possible in all Focus II barriers when a muting indicator (or 220 Ω / 3 W
resistance) is connected and work at the moment when power is switched on.
T/L-muting:
The muting function is activated if the OSSD outputs are active and the inputs A and B then
are closed. Sensor A must be activated at least 30 ms ahead of B.
X-muting:
The muting function is activated if the OSSD outputs are active and muting input A then is
closed while muting input B is opened. Either sensor can be activated ahead of the other, or
both at the same time.
The muting function remain as long as the terms are met (indicator working, A and B activated). See 5.
If the muting function is possible and something happens to the muting indicator (e.g. a lamp breakage), or
it is removed without first disconnecting the power supply to the barrier, the LEDs of the barrier will indicate
an error in the muting indicator, (see 15), and all muting attempts are ignored.
The muting function is easily disabled by disconnecting the muting indicator and then switching on the
power supply.
NB! A feature of the Focus II safety barrier is that, depending on how the change-over switches (1-3) in
the receiver are set (see 4.4), more or fewer beams of the protection area may be bypassed (muting) when
it is intended for the material to pass. The rest of the area remains intact with normal protection and safety
level.
This is an important function which decreases the possibility for a person to "accompany" material
passing the barrier.
2TLC172015M0201, rev. D
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