5
After the protective device is released and the muting function ends, the request of the
muting function must end after a defined time (max. 10 s, fixed value).
1
1
2
4
3
MR
TE
ESPE
OSSDs
Muting
active
t
Figure 13: Correct sequence for muting function with ending by higher-level control
1
Monitoring of the complementary circuit
2
Interruption of the protective device is expected after a defined time (max. 4 s, depending
on the speed of the conveyor). The muting function starts when the protective device is
interrupted.
3
Maximum duration of muting function is defined (depending on the length of the material
and the speed of the conveyor).
4
Ending of the muting function after the protective device is released and a defined delay
time has gone by (max. 4 s, depending on the speed of the conveyor).
After the higher-level control has requested ending the muting function, the protective
device must be released within a defined delay time (max. 4 s, depending on the speed of
the conveyor). Once this delay time has elapsed, the muting function is ended.
11.3
Time Extension Function
Once the muting function is active after a correct initiation sequence, the Time Exten‐
sion (TE) signal can be used to extend the maximum duration of the muting function.
This function can be necessary in the following situations:
•
The conveyor must stop while the muting function is active.
•
The materials being transported on the conveyor are placed directly one behind
the other at a distance of less than 200 mm or at the distances specified in the
risk assessment.
To activate this function, the Time Extension (TE) signal must be set to HIGH during a
correctly initiated muting function. The signal must remain on HIGH while the protective
field of the Type 4 electro-sensitive protective device is interrupted. Changing to LOW for
a period longer than T
Clearance
ends the time extension.
To prevent a sequencing error, the Time Extension (TE) must end before the muting
function request ends or before the muting function is ended due to the release of the
electro-sensitive protective function.
The Time Extension function is limited to a maximum duration of 100 h pro muting
process.
OPERATION
11
8021675/ZV26/2019-05-13 | SICK
O P E R A T I N G I N S T R U C T I O N S | Safe Entry Exit
41
Subject to change without notice
