SB series
User’s manual
7
3 OPERATION
The barrier is made up of one bar with transmitting optical elements and
one with receiving optical elements. The photosensitive elements are
regularly scanned in sequence along all its length so that any objects
placed between the projector and the receiver are detected and the
operation of the equipment being controlled is interrupted by means of the
opening of the outputs, with response times from 14 to 45ms according to
the model. It is complete with leds that display the operating status of the
machinery as well as any anomalies in the reset,
test
and
muting
inputs for
the models with this option.
The operator has a multifunction pushbutton, which is used for the
following:
x
TEST: if pressed during normal operation, it checks if all the system,
comprising the barrier and the machinery, is efficient. Pressing the
button (opening the contact) basically simulates the interruption of
one or more safety rays and it is possible to check that the
machinery stops in the time and way set.
x
RESTART: if pressed after an intervention by the barrier, (manual
reset condition) the system will be reset.
x
ALIGNMENT: if the button is pressed when there is no power supply
to the barrier and then power is restored, whilst the button is being
pressed, it enters alignment mode, i.e. it provides an indication of the
centring of the top and bottom optical unit by means of two yellow
leds.
x
OVERRIDE: (only present if the
muting
function is operational) if the
button is pressed within 5 seconds of switching on and it is kept
pressed for at least 5 seconds, the barrier will force the closure of
the outputs only if the rays are interrupted. This condition stops as
soon as the button is released or automatically after 120 seconds.
1.
Automatic reset
: after the barrier has intervened due to the detection of an
object, it returns to normal operation as soon as the object is removed.
2.
Manual reset
: normal operating mode is only restored after the object has
been removed and the reset button has been pressed.
To enable the
muting
function, the LMS muting indicator must be
connected
when the barrier is not connected to the power supply,
as
shown in section 6, and then the barrier’s power supply must be restored.
To disenable the muting function, the LMS muting indicator must be
disconnected
when the barrier is not connected to the power supply
,
and then the barrier’s power supply restored.
Please remember that by enabling/disenabling the
muting
function
the
override
function is automatically enabled/disenabled.
The outputs are PNP type.
SB series
User’s manual
8
Should the load to be controlled have alternating current or require more
than 500mA consumption, the
TGR-SB
relay module is available: this
converts the static outputs into relay outputs whose operation is directly
tested and controlled by the barrier itself.
4
PRECAUTIONS AND CRITERIA FOR INSTALLATION
The area where the barrier is to be installed must be compatible with the
appliance’s technical specifications. The temperature of the environment,
interference caused by electromagnetic disturbance and sources of light
and such like, should be assessed
a priori
; please contact the manufacturer
for any information not contained in this manual.
4.1
CALCULATION OF THE MINIMUM DISTANCE FOR INSTALLATION
The safety distance ‘S’ must guarantee that the operator cannot reach the
danger zone before the machinery with the moving parts has stopped. The
formula to calculate the safety distance for multi-ray barriers is as follows:
S = ( K * T ) + C
S =
safety
distance.
T
= T1 + T2
where T1 = machinery’s response time in seconds.
T2 = barrier’s response time in seconds.
K
= approach speed of the body to the danger zone:
2000 mm/s for SBx models, 1600mm/s for SBx-K models
C
=8*(d-14)mm for SBx models, 850 mm for SBx-K models where d is the
minimum object that can be detected (35mm for SBx and 14mm for SBx-HR)
S
= safety distance.
H1
= the bottom optical ray must not have a height above
300 mm
.
H2
= the top optical ray must not be below
900 mm
.
S
H2
H1
