SICK LGT 015 to LGT 090 Operating instructions

S

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DK

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FIN

GB

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LGT 015 to LGT 090

Safet Light Curtain

O P E R AT I N G I N S T R U C T I O N S

Titel_BA_LGT_A5.indd 1 22.06.2007 14:37:14 Uhr

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173

Operating instructions

LGT

GB

Contents

1 About this document 175

1.1 Function 175

1.2 Target group 175

1.3 Level of information 176

1.4 Symbols used 176

2 About safety 177

2.1 Applications for the device 177

2.2 Intended use of the device 177

2.3 General safety instructions and

protection measures 178

3 Product description 180

3.1 Layout of the system 180

3.2 How the device works 181

3.3 Indicators and controls 181

3.3.1 Function of the LED indicators 182

The seven segment display on the LGTN 184

3.3.2 Function of the DIL switches 185

4 Fitting 186

5 Electrical installation 188

5.1 Supply voltage 188

5.2 Output switching elements 189

5.3 Test input 190

5.4 Control switch 191

6 Placing in operation 192

7 Blanking 194

8 Inspection instructions 196

8.1 Inspections prior to placing in operation

for the first time 196

8.2 Regular inspection of the protection

equipment by specialist personnel 196

8.3 Daily inspection of the protection

equipment by authorised persons

instructed to perform the inspection 197

8.4 Environmentally responsible behaviour 198

Disposal 198

9 Technical data 199

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Contents

10 Dimensional drawings 201

11 Checklists 205

12 Conformity 206

Appendix 411

List of figures

1 The components of the LGT safety light grid system

2 Two sender and receiver units arranged in parallel extend

the height of the protective field

3 The LGT light grid must be mounted such that reaching

under/over and standing behind the protective field is

impossible.

4 Connection of the LGT light grid to the LGTN control unit

5 Output switching elements. A = primary relay contact,

B = auxiliary relay contact

6 The relay contacts are to be protected by arc suppressors

(C and R)

7 The semiconductor output reflects the actual state of the

protective field

8 Contamination signal output

9 Connection diagram for external contact monitoring. If

external contact monitoring is not used, terminals 5 and 6

must be bridged

10 Circuitry of the test input

11 The control switch is configured as a normally open contact

Sender unit

Receiver unit

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Abbreviations

Testable light grid

Testable light grid: sender

Testable light grid: receiver

Control unit

About this document

LGT

LGTS

LGTE

LGTN

Chapter 1

1 About this document

1.1 Function of this document

This document provides instructions on the operation of the

LGT testable light grid. It contains information on

• Fitting

• Electrical installation

• Placing in operation

• Maintenance

1.2 Target group of this document

The target group of this document is persons who install,

place in operation and operate the LGT/LGTN.

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ATTENTION

Note

Explanation

Recommendation

1.3 Level of information

These operating instructions contain information on how to

install, place in operation and operate the device. Official and

legal regulations are always to be observed; it is not possible

here to also provide comprehensive information on these

basic requirements. In Germany, the trade association

directives (ZH 1/597) in particular are to be observed.

Further information on health and safety and opto-electronic

protection equipment can be obtained directly from SICK AG,

e.g. Safe Machines (SICK notes on the usage of opto-

electronic protection equipment).

1.4 Symbols used

Some information in these operating instructions is specially

marked to ease rapid access to this information:

A note provides information on special features of the device.

An explanation communicates basic knowledge.

A recommendation assists in taking the best action.

Warning!

Always read warnings carefully and heed them

conscientiously.

About this document

Chapter 1

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The device can only fulfil its safety-relevant task if it is

correctly used, that is "safely" - i.e. fail-safe - fitted and

connected.

The LGT testable safety light grid complies with the safety-

specific requirements of

y Safety category type 2 in accordance with pr EN 50 100

2.1 Applications for the device

LGT testable safety light grids are non-contact protection

devices with a resolution of 30 mm. They are used as hand

protection to secure danger zones on machines and plant.

The devices are permanently fitted in the access area and

shut down the hazard producing motion if a minimum of one

light beam is interrupted.

2.2 Improper use of the device

The LGT testable safety light grid is only permitted to be used

in the context of 2.1 Applications for the device. In case of

any other usage, and in case of modifications to the device –

even during fitting and installation – any claims against

SICK AG under the guarantee are rendered void.

About safety

Chapter 2

2 About safety

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2.3 General Notes on Safety and

Protective Measures

1. The national / international regulations apply for the use /

installation of non-contact protection equipment as well as

for commissioning and recurring technical checks, in

particular

y Machine directive 98/37 EC

y Guidelines for working substances 89/655 EEC

y Safety regulations as well as

y Regulations for the prevention of accidents / rules for

safety

It is the responsibility of the manufacturers and users of

the machine on which our protection equipment is used, to

discuss all safety rules and regulations which may apply

with the responsible authorities and to observe these rules

and regulations.

2.2.

2. Furthermore, our notes, in particular the test regulations

(see chapter entitled Tests) in this Technical Description or

these Operating Instructions (such as use, assembly,

installation or integration in the machine control unit) must

be observed and followed.

3.3.

3. The tests shall be carried out by experts and/or persons

specifically authorized or commissioned to perform

these tests. They shall be documented at all times in a

comprehensible way.

About safety

Chapter 2

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4. Our Operating Instructions shall be given to the employee

(operator) working at the machine on which our protection

equipment is used. The employee shall be introduced to

his job and the equipment by an expert.

5. This leaflet is enclosed as an appendix and serves as a

checklist for checks carried out by the manufacturer and

fitter.

About safety

Chapter 2

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3.1 Layout of the system

The LGT safety light grid comprises

y control unit LGTN

y sender LGTS and

y receiver LGTE

as well as the two connection cables to the control unit

(Fig. 1, Appendix).

Two senders and receivers can be connected to one control

unit (Fig. 2, Appendix).

If two sender units and two receiver units are operated in

parallel – this is possible because the devices do not interact

– the height of the protective field can be doubled.

Product description

Chapter 3

3 Product description

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3.2 How the device works

It must be possible to influence operation of the machinery or

system electrically. It must be possible to interrupt operation

of the machinery or system at any time. The LGT must be

configured such that it is impossible to reach over, reach

under, or stand behind the protective field (Fig. 3, Appendix).

The LGT sender unit and receiver unit consist of adjacently

arranged individual elements, this results in the formation of a

light grid with parallel beams.

If only one light beam is interrupted, a switching command is

triggered to stop the machine.

3.3 Indicators and Controls

Sender units and receiver units are equipped with LEDs. The

control unit has LEDs and two seven segment modules as

indicators.

DIL switches facilitate the configuration of the light grid.

Product description

Chapter 3

Note

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3.3.1 Function of the LED Indicators

The LED indicators on the sender units and receiver units are

behind the front panel near the device connector. They have

the functions given in the table.

Product description

Chapter 3

Yellow Red Green

– – Supply voltage present

Supply voltage present

Clear light path

Low light reception

Protective field broken

LED off

LED on LED flashing

LED in any

condition

Yellow

Red

Green

Yellow

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The LED indicators on the control unit are in the control area

on the left, top corner. They have the functions given in the

table.

Product description

Chapter 3

Green Red Yellow

Clear light path

Insufficient light reception

(contamination, maladjustment)

Protective field broken

In "without restart inhibit" mode

In "with restart inhibit" mode

Green Red Yellow

Clear light path

Enabled by control switch

Insufficient light reception

(contamination, maladjustment)

Protective field broken

Prompt to press RESET

LED off

LED on LED flashing

Green

Red

Yellow

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Product description

Chapter 3

The seven segment display on the LGTN

The two-digit seven-segment display provides information

regarding status, faults, alignment, number of blanked

beams, etc. Error messages are indicated with the display

flashing.

No.

Fault Corrective measure

10

11

12

13

14

17

19

20

30

31

33

37

50

51

53

57

Check DIP switches and control switch

Check DIP switch setting

Check DIP switch setting, check plug-in connections of strips

Readjust sender power

Check external contact monitoring

Complete blanking procedure, reset DIP switch

Release "Test" button

Release "Control switch" button

Check sender and receiver type assignment, check

connection system

Check connections

Check type assignment connection system

Recalibrate sender power, check supply voltage

Check sender and receiver type assignment

Check connections

Check plug-in connections and check type assignment of

strips

Recalibrate sender power, check supply voltage

Restart inhibit configuration incorrect (jumper or

input at control switch)

DIP switch setting "Restart inhibit" has changed

during operation

DIP switch setting "No. of LGTs" does not match

the number of LGTs actually connected

Incorrect sender and receiver configuration

External contact monitoring not OK

Blanking successfully completed

Wait until "Test" button is released

Wait until "Control switch" button is released

Number of beams on sender and receiver not

identical (strip pair 1)

Sender and receiver incorrectly connected (strip

pair 1)

Status signal error from strip 1

Excessively high reception signal for given range or

supply voltage too low

Number of beams for sender and receiver not

identical (strip pair 2)

Sender and receiver incorrectly connected (strip

pair 2)

Status signal error from strip 2

Excessively high reception signal for given range or

supply voltage too low

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3.3.2 Function of the DIL switches

The operating modes of the LGT testable safety light grid are

set using DIL switches on the LGTN control unit.

Product description

Chapter 3

Switch Position Function

No.

4 ON "Calibration" mode activated

OFF deactivated

3 ON 1 connected sensor strip pair

OFF 2 connected sensor strip pairs

2 ON "Blanking" mode activated

OFF deactivated

1 ON Without restart inhibit

OFF With restart inhibit

Mode switch

Switch

No.

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The sender and receiver strips are mounted using their

threaded mounting bolts (M5). Either an M4 screw can be

inserted through the bolt, or the M5 thread in the threaded

mounting bolt is used directly (Fig.). The position of the

individual components is shown in 10 Dimensional drawings.

Fitting

Chapter 4

4 Fitting

Snap-on clip

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The sender and receiver strips must be mounted such that

the connection plug is pointing in the right direction, e.g. both

pointing upwards. Mounting with the plug pointing in

completely the opposite direction (180° rotation) is not

permitted.

Snap-on clips have been developed in order to ensure a high

degree of flexibility at the mounting site and to allow light

grids to be changed quickly (should this be necessary). These

clips can be screwed directly onto the mounting surface. The

light grids are then simply clipped into place.

Securing against sliding

To prevent the light grid from slipping downwards as a result

of vibration, a screw may also be used to secure the light grid

to the snap-on clip.

The control unit is bolted in place using the fixing holes

provided in the housing.

If the control unit is used without housing (for mounting in a

control panel), the control unit frame is clipped directly onto

the mounting rail.

To improve the EMC conditions, it is recommended to install

the light grid on the machine such that it is electrically

isolated. This can be achieved with the aid of insulating

collared washers.

Note

Fitting

Chapter 4

ATTENTION

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5.1 Supply voltage

Depending on the type of control unit, a supply voltage of

24 V DC or 115/230 V AC must be provided and connected

as per Figure.

optional

or

Preassembled connection cables must be used for

connecting the control unit to the sender and receiver strips.

These cables must be connected to the plug connectors

provided in the control unit (Fig. 4, Appendix).

The number of connected sensor pairs must be set at DIP

switch 3 in the control unit:

ON 1 connected sensor pair

OFF 2 connected sensor pairs

Electrical installation

Chapter 5

5 Electrical installation

Switch

No.

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5.2 Switching outputs

The primary relay A with its positively driven contacts is the

"safety" switching output of the LGT (Fig. 5, Appendix). The

control unit checks these contacts to ensure that they are

functioning correctly.

The auxiliary relay B with its switching output operates as a

second independent switch-off path if the primary relay fails.

According to pr EN 50 100, the output current circuits must

be appropriately protected, e.g. by means of fuses. Arc

suppressors must be provided to protect the relay contacts

(Fig. 6, Appendix).

The protective field status output gives the actual condition

of the protective field (Fig. 7, Appendix). This output is not

relevant to safety.

Protective field free Power applied to output

Protective field broken Power not applied to output

The contamination output signals possible contamination of

the light grid (Fig. 8, Appendix).

Light grid not contaminated Power not applied to output

Light grid contaminated Power applied to output

The external contact monitoring monitors the contacts of

connected contactors to ensure that they are functioning

correctly (e.g. frozen). For this purpose, these must be

followed back to the LGT and must be connected according to

the connection diagram (Fig. 9, Appendix).

The contactor monitor monitors the static rest position of the

external contactors. If a dynamic contactor monitor is

specified, the monitor must be integrated into the higher-

order controller.

Electrical installation

Chapter 5

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Electrical installation

Chapter 5

If the protective field is broken very briefly, a lockout together

with the error message 14 may occur in the case of heavily

rebounding contacts (Table, below).

The "Action" column gives the required measures.

If the contact monitoring is provided by externally connected

devices, terminals 5 and 6 must be bridged.

Note

Operating mode Action Indicators

"Without restart inhibit" Break the protective field again LGTN lights up green

Switch the voltage on and off LGTN lights up green

"With restart inhibit" Press the control switch LGTN lights up green

Note

5.3 Test input

The test input is used to initiate a test cycle (Fig. 10, Appen-

dix). The LGT including the primary relay and response time

are monitored to ensure that they are functioning correctly. If

a safety-relevant error is detected during the test, the

switching elements remain open. The machinery can thus no

longer resume its work. An N/C contact must be connected to

the test input.

Safety can only be guaranteed if the test input is used

(installed in the machine controller).

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5.4 Control switch

The control switch is used in the operating mode "with restart

inhibit" to close the primary and auxiliary relay contact again

when the protective field has been broken or when a test

cycle has been performed with an unbroken protective field

(Fig. 11, Appendix). The machinery can thus resume

operation.

If the test signal is shorter than 100 ms, the control switch

must not be actuated.

An N/O contact must be connected to the input terminal

contacts.

Installation location of the RESET button

Choose the location for installing the RESET button correctly:

The RESET button is to be installed such that it cannot be

operated from within the danger zone, and such that the

danger zone can be seen when operating the button.

Chapter 5

Electrical installation

ATTENTION

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