The receiver unit is equipped with 2 safety relays with guided
contacts which can be directly used to stop the dangerous
movement. However, most of the time, additional relaying (or
Final Switching Devices) between the equipment outputs and
the machine circuitry is necessary. For this reason, the FF-SPS4
has a Final Switching Device monitoring input to negate the use
of a self-checking relay module. A test input is also available.
The use of the test input sets the equipment in an alarm
condition. When used in conjunction with the monitoring
input, the test input facility provides the ability to regularly
check the correct operation of interface relays.
Beam heights above the reference floor
Number
of beams
mm
in.
2
3
4
400/900
15.7/35.4
300/700/1100
300/600/900/1200
11.8/27.6/43.3
11.8/23.6/35.4/47.2
S
A lens heating system is available on some models to prevent
condensation where conditions of use may require such an
equipment. These models can operate down to -25°C/-13°F
ambient temperature.
LED indicators provide useful visual information on the equip-
ment status during installation and operation. They ease beam
adjustment and warn the operator about a lens contamination
or misalignment before an unexpected emergency stop signal
is generated.
The number of beams to be used needs to be defined according
to the risk assessment and to the importance for the machine
operator to pass undetected. Particularly, during risk assess-
ment, methods of defeating the safety equipment shall be taken
into account before selecting the correct configuration.
The equipment is delivered with a pair of standard adjustable
brackets for ease of installation. The use of deflection mirrors is
a cost effective solution for designing multiple separate beam
trip devices or perimetric protections around a dangerous area.
Protection against mutual interference
A laser pen is available as an accessory. It helps a single person
adjust rapidly and easily the infrared beams even if deflection
mirrors are used.
When more than one FF-SPS4 is used, mutual interference may
occur between sets.
The device features the highest level of safety and can be used
for a wide range of dangerous machines.
To avoid these undesirable disturbances, the device is equipped
with internal switches designed to select the emission fre-
quency F1 or F2 of the infrared modulated light. The position of
these switches can be changed to avoid mutual interference
between two systems.
Multiple separate beams
Multiple separate beams are often used to detect the intrusion
of the whole body rather than parts of the body.
In some cases, mutual interference can be cancelled by using
two different emission frequencies and by reversing the trans-
mission direction of the through scan beams. This would be the
case for a three beam trip device for instance:
The installation of a multiple separate beam arrangement has to
be carried out in such a way that access to the dangerous mov-
ing parts is impossible without breaking the beams.
The pr EN 999 European standard gives the following formula
for the calculation of the minimum safety distance between the
dangerous zone and the detection plane. Compliance to this
formula will ensure reliable detection of an operator and stop
the dangerous motion before the operator reaches the danger:
0.5 to 40 m / 1.6 to 131.2
F1
R3
E3
S ³ 1600 (t1 + t2) + 850 (mm)
(or Ds ³ 63 (t1 + t2) + 33.5 (in)
Ds = S)
S: Minimum safety distance (in mm/in)
F2
F1
E2
E1
R2
R1
t1: Response time of the FF-SPS4 equipment (0.02 sec)
t2: Response time of the machine (in sec), i.e. time required
to stop the machine or remove the risk after receiving the
output signal from the protective equipment
Recommended beam heights
EN 999 recommends the following heights which have been
found to be the most practical in application for multiple sepa-
rate beams.
:"energized relay" indicator lights on
:"de-energized relay" indicator lights off
106
• Industrial Safety Products •
FF-SPS4 Series
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