Techno GR SB4 Series - TIMING CONSTRAINTS (Muting Function)

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
Mutin
g
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
OFFOFF
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.