Honeywell SYA14 Series, Manual

Page: 553 / 737

107004-15 EN FR26 ROW 0899 Printed in France 19
TIMING CONDITIONS
•
The 8 ms minimum time difference between the two SMs inputs guarantees the
detection of a permanent short circuits of one of the SMs inputs. Physically, the 2
sensors must be separated so than someone cannot actuate both of them.
•
If a new transition of a sensor SM occurs during a muting sequence, the muting
sequence is immediately stopped to avoid the permanent muting of the safety
function. The relative position of sensors SMs and EMs define a minimum distance
between 2 successive moving objects.
•
In the conveyor mode, the object must interrupt the safety light curtain
detection beams, before releasing both sensors SMs and 6s max. after the
actuation of the second sensor SM.
Figure 2.4 : Example of an incorrect installation
The muting sequence starts 50 ms after both sensors SMs have been actuated. The
seconde transition of the sensor SM1 stops the muting sequence in progress and the
status of the module OSDs outputs is identical to the status of the protective equipment
OSSDs ouputs.
SM1
SM2
Muting
allowed
OSSD
OSDs
Muting
interrupted
protective equipment
muting module
start muting sensor
start muting sensor
Protection
∆
t = 50 ms
tmin = 8 ms / tmax = programmable from 1s to 8 s
< 6 s
t
min
< t < t
max