SB series
User’s manual
25
Where:
D: minimum
distance
for
the
muting
sensors to keep the
request operational; depends on the length of the box:
D < L.
d
1
:
maximum distance required for the
muting
request to be
accepted; depends on the speed of the box:
d
max
[cm]= v[m/s] * 3[s] * 100
It is necessary that this distance does not allow both
sensors to be activated and thus
muting
if a person goes
through by accident.
Supply Cable
Cable to lamp
Muting cable
RX cable
TX cable
Muting
lamp
Start & Test
buttons
Protect
cables
x
The TEST/RESTART button must be located so that the operator
can see the protected area when restarting
,
testing or overriding.
x
The external illuminated indicator for
muting override
enabled must
be located so that it can be seen from all sides of operation.
x
If the
muting
sensors are installed very close to the barrier, care
must be taken that the receivers of the sensors are mounted on the
transmitter side of the barrier in order to avoid interference.
x
The system is protected against the possibility of faults due to
damage to the wires; however we recommend laying the cables for
all connections in order to avoid damage to the connection cables.
SB series
User’s manual
26
9.5
TIMING CONSTRAINTS (muting function)
a) The
muting
request must take place with the correct timing
sequence: the Muting A input must be enabled first and then the
Muting B input. The request for the latter must be made within a
maximum of 3 seconds and not before 30 ms after the enabling of
the Muting A input. Otherwise the
muting
function will not be
enabled. An incorrect sequence on the
muting
inputs will have no
result.
b)
Muting
status can be maintained for an unlimited time according to
requirements, provided the request is maintained.
3 s
max
30 ms
min
ON
OFF
OFF
Muting A
Muting Status
Muting B
A
muting
request cannot be made if the barrier outputs are open,
that is to say when the rays have been interrupted.
