Project Engineering
64
NOTE!
In order to carry out a valid muting sequence, the object must have at least the length l (with
l = d
1
+ d
2
).
Example:
• Belt speed
v = 0.5
• Processing time muting signals
t
ESPE
= 95 ms
• Response time MS
t
MS
= 1 ms
d
1⁄2
≥
v ×(t
ESPE
+t
MS
)=0.5 ×(0.095+0.001)s = 0.048 m
The minimum distance between the two MS and the distance of the MS2 to the safety field of the ESPE is
48 mm. Accordingly, the muting object must have a minimum length of 96 mm.
Valid muting sequence:
Action
Comments
1. Muting start
MS1 is activated first, followed by MS2. Both sensors must be activated within a
time frame of 4 seconds.
2. Muting active
MS1 and MS2 active.
Penetration of the safety field (muting
object passes through ESPE).
The safety field is interrupted, the OSSDs
remain in the ON state.
3. Muting active
MS1 or MS2 are inactive.
Muting remains active.
4. Muting end
MS1 or MS2 are inactive for longer
than 4 seconds.
The safety field is cleared again.
Maximum muting duration is reached.
Depending on which status is reached first.
Signal path
Muting
active
SF
penetration
Figure 7: Signal path with 2-sensor linear muting
