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GuardShield Safe 2 Operation Manual

Operation Manual GuardShield Safe 2

5. Installation

5.1. Regulations and standards

The compliance with the fundamental health &

safety requirements as detailed in the EU Machinery

Directive EC/98/37 has to be achieved with the correct

implementation of safety components. With the help

of a hazard analysis as laid out in EN 292 and EN

1050, a comprehensive safety evaluation has to be

made when designing and planning machinery and

machinery control equipment. If Active Optoelectronic

Protective Devices (AOPD) is used, the required

safety distances, sufﬁcient protective height and all

application conditions must be considered during the

planning phase.

5.1.1. Safety distance to danger point

According to the standards, the GuardShield Safe 2

light curtain and the point of danger must be separated

by a deﬁned safety distance. This minimum distance

safeguards that the danger point may only be reached

after the hazardous motion has stopped. The safety

distance (see also standards EN 294, EN 775, EN

811, EN 999) depends on

• Machine stop time

• Response time of the protective device (light

curtain + safety relays)

• Resolution of the protective device

• Approaching speed to the danger point

• Position of the AOPD

The approaching speed is dependent on safety

distance S as follows:

S ≤ 500 mm, speed = 2 mm / ms

S > 500 mm, speed = 1.6 mm / ms

In cases of ‘vertical’ installation of the light curtains

within an industrial environment and a resolution of

the light curtain system d, (where 14 mm ≤ d ≤ 40

mm), the safety distance S to the point of danger is

calculated according to the formula:

For 100 mm ≤ S ≤ 500 mm:

S = 2 mm / ms x T + 8 x (d - 14)

For S > 500 mm

S = 1.6 mm / ms x T + 8 x (d - 14)

S = Safety distance in mm

T = Total response time in ms

(machine stop time + GuardShield Safe 2

response time + safety relay response time)

d = Resolution of GuardShield Safe 2 in mm

In the case of perimeter systems (chapter 4.5) or light

curtains with a resolution d > 40 mm the safety distance

is calculated for vertical mounted light curtains and

horizontal approach, according to the formula:

S = 1.6 mm / ms x T + 850 [mm]

More detailed information regarding safety distance

and safety height can be found in EN 999 or EN 294,

depending on mounting type of application.

5.1.2. Height of protective ﬁeld

The protective ﬁeld is clearly visible as the black

area with the optical lenses on the transmitter and

receiver.

In addition the height of the protective ﬁeld A is found

on the label of each system and in the selection tables,

described in chapter 8.2 (resolution 30 mm).

Warning:

The laser beams of the ILAS are not part of to the

protective ﬁeld.

Use only the protective ﬁeld as mentioned on the

product label. Otherwise serious injury or death

may occur.

5.1.3. Response time – light curtain

The response time t

is found on the product label,

Conﬁguration Tool or from the selection tables 8.2.

5.1.4. Distance to reﬂective surfaces

Reﬂective surfaces may cause reﬂections within

the transmitter and receiver aperture angle, i.e.

an interruption of the protective ﬁeld would not be

recognized (Figure 7).

Figure 7: Distance to reﬂective surfaces

Should reﬂective surfaces arise, i.e. aluminium

container passing near the light curtain or if the danger

point itself is reﬂective, i.e. a steel blade, the safety

distance S

must be increased, such that no reﬂective

surface lies within the distance S

The increase of the safety distance is dependant of

the actual operation range R according to IEC 61496

and may be calculated as follows:

GuardShield Safe 2:

S2 = 131 mm for R < 3 m

S2 = R x 0.0437 for R ≥ 3 m

dangerous point

reflective surface

optical axis

5.1.5. Multiple light curtain arrangement

When using several optoelectronic safety devices in

the same application, the systems should be installed

in such a way that they cannot interfere with each

other. Care must be taken that each receiver only

receives light from its own transmitter (Figure 8).

Figure 8: Multiple light curtain arrangement

The

safety light curtain has been thoroughly tested

against light interferences according to the stringent

requirements of IEC 61496. Nevertheless any direct

interference into the receiver with other infrared

sources like through beam photoelectric sensors,

laser scanner, transmitters etc. should be avoided.

Mechanical installation

Be aware that a rigid, ﬂat base, isolated against

shock and vibration should be selected to mount the

GuardShield Safe 2. This in combination with the

standard mounting brackets set will keep the initial

alignment during operation even in harsh industrial

environments.

5.1.6. Mounting brackets

The backside of the light curtain proﬁle has continuous

grooves to ﬁx the mounting brackets at any position

along the light curtain housing (Figure 18).

Each system is delivered with four mounting

brackets.

Available mounting brackets (Figure 9):

• Vertical mounting brackets for mounting the light

curtain in the vertical axis of the light curtain.

(± 4

adjustable)

• POC AND SICK FGS mounting proﬁles (not

adjustable)

Receiver

Transmitter

Receiver

Transmitter

Receiver

TransmitterReceiver

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