Wenglor SEFG Muting, Operating Instructions Manual

Page: 66 / 187

Project Engineering 66
Calculating the minimum distance
d
1/2/3/4
≥ v × (t
ESPE
+t
MS
)
d
1
[m] Minimum distance between MS1 and MS2 (see Figure 8 )
d
2
[m] Minimum distance between MS2 and safety field of the ESPE (see Figure 8 )
d
3
[m] Minimum distance between the safety field of the ESPE and MS3 (see Figure 8 )
d
4
[m] Minimum distance between MS3 and MS4 (see Figure 8 )
d
5
[m] Size of the muting range (see Figure 8 )
v [m/s] Speed of the material on the conveyor line
t
ESPE
[s] Processing time muting signals
Is the time required by the ESPE for processing all muting signals. The value can be
found in the technical data
Section 4.1, page 15 .
t
MS
[s] Response time MS
a, b Distances
NOTE!
• The muting object must be at least long enough that all 4 MS are triggered at the same
time during the muting sequence. This parameter is indicated by the value d
5
.
ATTENTION!
• The distance d
5
must be at least 500 mm.
• To reduce the risk of unintentional triggering of the MS, the distance d
1
and d
4
must be at
least 250 mm.
• To make it more difficult to bypass the safety devices, the distances d
2
and d
3
must be
max. 200 mm each.
Example:
• Belt speed v = 0.5
• Processing time muting signals t
ESPE
= 95 ms
• Response time MS t
MS
= 1 ms
d
1/2/3/4
≥ v × (t
ESPE
+t
MS
) = 0.5 × (0.095+0.001)s = 0.048 m
Based on this calculation, each of the MS should be mounted at least 48 mm apart. The following minimum
distances apply, however, due to the restrictions outlined above:
d
1
: 250 mm
d
2
: 48 mm
d
3
: 48 mm
d
4
: 250 mm
d
5
: 596 mm

The muting object must have a minimum length of 596 mm.