Honeywell SYA14 Series Manual page 575

Figure 3.5 : Muting of a safety light curtain on a mechanical
press
1 2 3
opening stroke
opening stroke
BDC
Protection Muting starting Muting in progress
(SM1&SM2 activated)
(SM1 activated) (SM1&SM2 activated)
t < ∆ max.
SM1
8 ms < t < tmax
SM2
OSSDs
ESPE
Muting
lamp
OSDs
muting
module
MUTING
∆max = 1 mn, tmax = 1 s for a press (For
machines different than presses, refer to
chapter 2.4.2 SM inputs, to change tmax and
∆max).
107004-15 EN FR26 ROW 0899 Printed in France
4 5 6
TDC
closing stroke
closing stroke
Muting maintained
Muting interrupted Protection
(SM1&SM2 activated)
(SM1 released) (SM1&SM2 released)
BDC (Bottom Dead Center)
1
point at which the tool is closest to the
die
0
TDC (Top dead Center)
point at which the tool is furthest to the
1
die
0
The muting sequence starts when the
output of the second sensor SM2
1
switches ON, and stops as soon as the
0
output of the first sensor SM1 switches
OFF. Both sensors must
1
maintained to prolong the muting
0
sequence to its maximum duration
(∆max).
1
0
Note :
It is possible to start a muting
sequence as soon as the press tool
reaches a position at 6 mm above the
BDC. At this position, the operator is
no more exposed to a dangerous
situation, and the starting of the muting
sequence avoids damaging the part if
the detection field of the light curtain is
unexpectedly interrupted.
be
41