Functions
Leuze electronic
MLD 300, MLD 500
22
tive environmental conditions. For timing controlled 4-sensor muting, the four muting sensors arranged in
succession must be activated in a defined and specific order to trigger muting see figure 4.5.
Muting occurs during both forward and reverse drives. The order in which the muting sensors are activated
is decisive for launching muting. The following orders are permitted:
• MS1, MS2, MS3, MS4
• MS4, MS3, MS2, MS1
MS2 (MS3) must be activated within 4s of MS1 (MS4).
Muting is ended correctly (e.g. the OSSDs remain in the ON state during passage) when the MS3 becomes
free during the expected passing sequence and therefore switches to “inactive”.
Muting is ended incorrectly (e. g. the OSSDs switch off) when the following cases occur:
• During the muting process, a muting sensor incorrectly switches to “inactive”.
• MS2 is not activated within 4 s after MS1 (or MS3 is not activated within 4 s after MS4).
• The muting time limit has elapsed.
4.7.4 Muting timeout
A flexible, application-adapted muting timeout extension (e.g. by a high-pass signal) is possible in oper
-
ating modes 1, 5 and 6 (see chapter 4.7.9). In the standard operating modes, the time frame for the muting
timeout is set to 10 min. and muting is automatically ended after this time elapses (the protective function
is active again). In operating modes 2 and 4, 8 h is set as muting timeout.
For this purpose, +24 V must be applied to the muting timeout input before muting is initiated. If, during
muting, voltage now switches to 0 V at this input (e.g. by a high-pass signal), the muting timeout is
extended as long as 0 V continues to be present. After the muting timeout extension ends, muting is only
possible for another 10 min.
The muting timeout extension ends as soon as one of the following conditions is met:
• Level at the input of the muting timeout extension switches to the high state
• Muting duration reaches 8 h
1
Danger zone
MS1 Muting sensor 1
MS2 Muting sensor 2
MS3 Muting sensor 3
MS4 Muting sensor 4
t
4 s
Figure 4.5: Timing controlled 4-sensor muting: arrangement of the muting sensors and timing
Make sure that the material to be transported is sufficiently long for the simultaneous activation
of the muting sensors see chapter 6.2.6 „Arrangement of the muting sensors for timing controlled
4-sensor muting“.
1
MS3 MS4
MS1 MS2
MS1
MS2
Muting
t
MS3
MS4
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