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6.4 L-Activation Mode
The L-muting activation mode can be used in applications where material is transported only out from the
hazardous area. Two muting sensors are connected to the two Muting inputs, Muting A and Muting B.
This muting activation mode can only be used in uni-directional transport. Failure to do so may result in
serious injury.
NB!
– d1 is the distance between the muting sensors. It must be more than 250 mm and needs to be checked
additionally in regards to the speed of the material transport and time limitation in the muting function.
– d2 is the distance between the Muting sensor B and the Focus II system. It must be as short as
possible. Timing limitations and the speed of the material transport must be considered additionally.
– d is the distance between the Focus II system and the sensor connected to Muting A input. This
distance represents the minimum length of the material to be detected.
Timing requirements and limitations:
• If Muting A is activated, Muting B must be activated within 120 s to activate the muting function.
Otherwise muting function is not achived.
• Muting A and Muting B cannot be activated at the same time. A minimum time difference is
approximately 30 ms and is mandatory.
• If Muting A and Muting B are activated, the protective f i eld must be obscured within 120 s. Otherwise
the muting function is stopped.
• Maximum muting time is 600 s. After this time, muting function is stopped even if the muting inputs are
still active or the protective f i eld is still obscured.
• The Focus II allows that Muting A or Muting B and the whole protective field to drop for a maximum
time of 200 ms without stopping the muting function. A time longer than 200 ms and the muting function
stops.
www.abb.com/lowvoltage
Protected Area
A
B
d1 d2
d
31
2TLC172015M0201, rev. D
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