Reer V4BH, V2BL, V2BH, V3BH, V4BL Instructions Manual

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 This symbol stands by a very important warning concerning the safety of persons.

Its non-observance can cause a very serious risk for the exposed personnel.

INTRODUCTION

The VISION photoelectric barrier is a multi-beam optoelectronic safety system. It belongs to
the family of Type 2 electrosensitive devices for the protection of personnel exposed to risks
arising from the use of hazardous machinery or plant.

The VISION barrier, which consists of an Emitter and a Receiver, is a type 2 optoelectronic
safety device according to standards IEC 61496-1 and IEC 61496-2.

VISION is available in two different families of models depending on the maximum working
range : 6m (VL models) and 16m (VH models).

The two built-in safe static PNP outputs enable the barrier to be connected to the AD SR
safety modules or to a safety PLC or to another control system that satisfies the specific
requirements and safety level of the application.

VISION is ideal for protecting:
Machinery for product handling such as conveyors, palletizing, collating machines;

packaging and wrapping devices; automated assembly lines; automated warehousing.

 If necessary, for any safety-related problems contact the competent safety

authorities or industrial associations in the country of use.

 For applications in the food industry, please contact the manufacturer to ensure that

the barrier contains materials that are compatible with the chemical agents utilized.

The protective function of the optoelectronic devices is not effective in the following cases:

 If the machine stopping control cannot be actuated electrically and it is not possible

to stop all dangerous machine movements immediately and at any time during the
operating cycle.

 If the machine generates dangerous situations due to material being expelled or

falling from overhead.

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NEW SAFETY PARAMETERS FOR TYPE 2 BARRIERS AND MANDATORY LABELLING



With the publication of Edition 3 of the harmonized EN 61496-1 standard it is no longer
possible to use a Type 2 safety light barrier for safety functions assessed as
SIL 2 / PL d.

If a safety level of SIL 2 / PL d (or higher) is required and it is nevertheless intended to
use a safety light barrier, then it will be necessary to use a Type 4 safety light barrier.

This regulatory requirement derives from the fact that the reduction of risk that can be
obtained via a photoelectric safety barrier is not only a function of the safety level of its
electronic parts, but is also determined by its systematic capabilities (for example:
environmental influences, EMC, optical performance and detection principle).

The systematic capability of a Type 2 photoelectric barrier may in fact not be sufficient
to ensure adequate risk reduction for SIL 2 / PL d applications.

The standard also establishes that the labelling of Type 2 safety barriers must indicate
such limitation to SIL 1 / PL c.

The PFHd values declared for the electronic control part of the device, on the other
hand, are not limited and therefore it is possible to use the PFHd value provided by the
manufacturer of the device in the global assessment of the safety function, even if it
exceeds the SIL 1 / PLc range.

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OPERATION

If the protected area is clear, the two outputs on the Receiver are active and enable the
machine to which they are connected to operate normally.

Each time that an object bigger than or equal in size to the resolution of the system
intercepts the optical path of one or more beams, the Receiver deactivates the outputs.

This condition enables hazardous machine movements to be stopped (by means of an
adequate machine emergency stop circuit).

 The resolution is the minimum dimensions that an object must have so that, on

crossing the protected area, it will certainly intercept at least one of the optical
beams generated by the barrier (Figure 1).

Figure 1

The resolution is constant irrespectively of work conditions, as it only depends on the
geometric characteristics of the lenses and the distance between the centres of two adjacent
lenses.

The height of the protected area is the height that is actually protected by the safety
barrier. If the latter is placed horizontally, this value refers to the depth of the protected area.

The working range is the maximum operative distance that can exist between the Emitter
and the Receiver.

VISION is available with the following resolutions:

– 20 mm (protected height from 150 mm to 1800 mm)

PROTECTION OF FINGERS

– 30 mm (protected height from 150 mm to 1800 mm)

PROTECTION OF HANDS

– 40 mm (protected height from 300 mm to 1800 mm)

PROTECTION OF HANDS

– 50 mm and 90 mm (protected height from 300 mm to 1800 mm)

PROTECTION OF ARMS AND LEGS

ADMIRAL is available also in the Multibeam configuration with the following lens pitch:

– 500mm (2 beams), 400mm (3 beams), 300mm (4 beams).

PROTECTION OF BODY

P = Pitch between two lenses
D = Diameter of one lens

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INSTALLATION

Before installing the VISION safety system, make sure that:

 The safety system is only used as a stopping device and not as a machine control

device.

 The machine control can be actuated electrically.
 All dangerous machine movements can be interrupted immediately. In particular, the

machine stopping times must be known and, if necessary, measured.

 The machine does not generate dangerous situations due to materials projecting or

falling from overhead; if that is not the case, additional mechanical guards must be
installed.

 The minimum dimensions of the object that must be intercepted are greater than or

equal to the resolution of the specific model.

Knowledge of the shape and dimensions of the dangerous area enables the width and height
of the relative access area to be calculated.

 Compare these dimensions with the maximum working range and the height of the

protected area in relation to the specific model.

The general instructions set out below must be taken into consideration before placing the
safety device in position.

 Make sure that the temperature of the environment in which the system is to be

installed is compatible with the temperature parameters contained in the technical
data sheet.

 Do not install the Emitter and Receiver close to bright or high-intensity flashing light

sources.

 Certain environmental conditions may affect the monitoring capacity of the

photoelectric devices. In order to assure correct operation of equipment in places
that may be subject to fog, rain, smoke or dust, the appropriate correction factors Cf
should be applied to the maximum working range values. In these cases:

where Pu and Pm are, respectively, the working and maximum range in meters.

Pu = Pm x Cf

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The recommended Cf factors are shown in the table below:

ENVIRONMENTAL CONDITION

CORRECTION FACTOR Cf

Fog

0.25

Steam

0.50

Dust

0.50

Dense fumes

0.25

 If the device is installed in places that are subject to sudden changes in temperature,

the appropriate precautions must be taken in order to prevent the formation of
condensation on the lenses, which could have an adverse effect on monitoring.

POSITION

The position of the VE Emitter and the VR Receiver must prevent access to the danger zone
from above, below and from the sides, unless at least one of the optical beams has been
intercepted. Some useful information regarding the correct position of the barrier is shown in
the figure below.

Incorrect positioning of barrier

Correct positioning of barrier

Figure 2

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SAFETY DISTANCE CALCULATION

The barrier must be installed at a distance that is greater than or equal to the minimum
safety distance S, so that a dangerous point can only be reached after all hazardous
machine movements have stopped (Figure 3).

According to European standard EN999, the minimum safety distance S must be calculated
using the following formula:

S = K (t1 + t2+ t3) + C

where:

S

minimum safety distance

mm K approach speed of object to the dangerous area

mm/sec

t1

response time of the safety barrier in seconds

sec

t2

response time of the safety interface in seconds

(e.g. PLC or safety module*)

sec

t3

machine response time, in seconds, meaning the time

required for the machine to interrupt the dangerous movement

following transmission of the stop signal

sec

c

additional distance

mm

* t

2

AD SR1 = 20 msec (refer to the technical manual of each single safety module, if different

from AD SR1).

 The non-observance of the correct safety distance reduces or cancels the protective

action of the light curtain.

 If the position of the barrier does not prevent the operator from having access to the

dangerous area without being detected, additional mechanical guards must be
installed to complete the system.

“S”=Safety distance

Figure 3

HAZARDOUS
MACHINE

S