Honeywell SYA14 Series Manual page 567

ADDITIONAL PROTECTIONS
Additional hard guardings must be designed and installed in such a way that
people cannot enter the dangerous area without being detected by the protective
equipment. Particularly, a person following parts vehiculed towards the dangerous
zone shall be detected when interrupting the safety light curtain detection field.
Failure to comply with these instructions could result in death or serious
injury.
INCORRECT INSTALLATION
The distances between sensors SM1a & SM2a and the safety light curtain shall be
calculated taking into account the size of the object which must be detected : the
object must interrupt the safety light curtain detection beams, before releasing both
sensors SMs. The distance between the first sensor SM1a & SM2a and the protective
field must be smaller than the size of the vehiculed object, otherwise the muting
sequence stops as soon as the first sensor SM1a & SM2a is released and the
intrusion of the object inside the protective field leads to the immediate stoppage of
the machine.
Figure 3.2 : Two-direction muting using four sensors
with :
A : distance between SM1 and SM2, t
A
B : distance between SM2 and ESPE, t
C = B + L, t = C/V
C
where V is the object velocity, L is the object length
and t , t , & t are the object transit times.
A B C
107004-15 EN FR26 ROW 0899 Printed in France
< ∆ mn max.
t
C
SM1a/b
8 ms < t < tmax
A
SM2a/b
t < 6 s max.
B
OSSDs
ESPE
Muting
lamp
OSDs
Muting
Muting
module
= A/V
= B/V
∆max & tmax :
B
see chapter 2.4.2 SM inputs
1
0
1
0
1
0
1
0
1
0
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