Time of switching
C
alculating the time of switching
•
The time of switching is calculated using the following equation:
t
UFVz
= t
EVz
+ t
exOVz
+ t
StVz
where
•
t
UFVz
= t
ime by which the switching is advanced
•
t
EVz
= input delay for the control inputs
•
t
exOVz
= delay time due to external OSSDs via EFI = 20 ms
•
t
StVz
= delay time due to external control inputs via EFI (0.5 × basic response time
of the slowest system in the EFI system)
Complementary information
•
In t
he phases before and after switching, only the minimum distances calculated
for the individual monitoring cases apply.
•
The preceding considerations are provided exclusively for the purposes of select‐
ing the optimum switching time.
•
If the timing for the switching cannot be exactly defined, e.g., due to the variable
processing speed of the machine, or if advancing of the timing results in prema‐
ture termination of the monitoring of the initial area, the two protective fields must
partially overlap.
Further topics
•
"Input delay", page 74
4.3.4 Stationary applications in horizontal operation
This type of protective device is suitable for machines and systems where, for example,
a ha
zardous area is not completely surround by a physical guard.
4 P
ROJECT PLANNING
38
O P E R A T I N G I N S T R U C T I O N S | S300 Mini 8014170/ZA23/2019-11-14 | SICK
Subject to change without notice