Honeywell SYA14 Series Manual page 578

Figure 3.8 : Muting of a safety light curtain on a hydraulic press
EM2 EM2
EM1 EM1
1 3
SM1 SM1
2
SM2
SM2
opening stroke
closing stroke
BDC
Protection Muting starting Muting in progress
(SM1 activated) (SM1&SM2 activated) (SM2 released)
t < ∆
max
.
SM1
8 ms < t < tmax
SM2
OSSDs
ESPE
EM1
EM2
Muting
lamp
OSDs
MUTING
muting
module
∆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).
44
EM2 EM2 EM2
5
EM1 EM1 EM1
4
SM1
SM1 SM1
SM2
SM2 SM2
TDC
opening stroke
Muting interrupted Protection
(EM1 activated) (EM1&EM2 activated)
BDC (Bottom Dead Center)
point at which the tool is closest to the die
1
TDC (Top dead Center)
0
point at which the tool is furthest to the die
1
The muting sequence starts when the ouput of
0
the second sensor SM2 switches ON, and it
stops as soon as the output of the first sensor
1
EM1 switches OFF.
0
1
Note :
0
It is possible to start a muting sequence as
soon as the press tool reaches a position at 6
1
mm above the BDC. At this position, the
0
operator is no more exposed to a dangerous
1
situation, and the starting of the muting
0
sequence avoids damaging the part if the
1
detection field of the light
0
unexpectedly interrupted.
107004-15 EN FR26 ROW 0899 Printed in France
EM2
EM1
6
SM1
SM2
closing stroke
Protection
(EM1 activated)
curtain is