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8 007 487/ 10-10-99 Technical Description • LGT © SICK AG • Safety Systems • Germany • All rights reserved

5.3.3 Operating modes

The LGT Light Grid can be oper-
ated "with..." or "without restart in-
terlock". This means:

In the operating mode "without re-
start interlock", the contact inputs
for the machine control must be
bridged.

5.3.4 Machine control

The control switch is used to close
the main relay and test relay con-
tact again in operating mode "with
restart interlock" when the protec-
tive zone is clear again after an in-
terruption or after a test has been
successfully performed (Fig. 18).
The machine can then resume op-
eration.
A make contact must be connected
to the input terminal strip.

A semiconductor output provides
the exact status of the protective
zone (Fig. 16). This output has no
safety relevance.

Prot. zone free:

output live

Protective zone
interrupted:

no output

The light grid is monitored con-
tinuously for contamination. The
status is signalled by means of the
contamination semiconductor out-
put (Fig. 17).

Light grid not
contaminated:

no output

Light grid
contaminated:

output live

7

8

RL

+24V

Fig. 16.  The semiconductor output gives
the actual status of the protective zone

Fig. 17. Contamination semiconductor out-
put

9

10

RL

+24V

With restart interlock

After the protective zone has been
interrupted or a test performed, the
contact of the main and auxiliary re-
lays do not close until the machine
control has been actuated. This
means that the machine cannot
resume operation until the protective
zone is clear again and the machine
control has been actuated.
If the duration of the test signal is less
than 100 ms, it is not necessary to
actuate the machine control.
The machine control must also be
actuated after the supply voltage has
been applied in this operating mode.

Without restart interlock

After the protective zone has been
interrupted or a test performed, the
contact of the main and auxiliary re-
lays close immediately after the pro-
tective zone has been cleared. It is
not necessary to actuate the machine
control. Operating modes are set via
the DIP switches on the control unit
board.

Fig. 18. The machine control is implemented
as a make contact

1

2

+24V

+4V

1,2 k

Control switch

Summary of Contents for LGT 015

Page 1: ...T E C H N I C A L D E S C R I P T I O N LGT 015 LGT 090 Safety Light Grids HIGH AVAILABILITY MINIMUM DIMENSIONS UNIVERSAL APPLICATION...

Page 2: ...etween control unit and customer interface 9 5 3 2 Switching outputs 10 5 3 3 Operating modes 11 5 3 4 Machine control 11 5 3 5 Test input 12 5 3 6 Contactor monitor 12 5 3 7 Sender power setting 13 5...

Page 3: ...rsal application Easy to install The following characteristic data are applicable in practice Fig 1 Maximum width of protective field 6 m Resolution obstacle detection 30 mm Maximum height of protecti...

Page 4: ...1 Applications LGT Safety Light Grids are used for point of point guarding Fig 2 and 3 and hazardous area guarding Typical applications include Form clamps as used in the wood industry Packaging machi...

Page 5: ...ey shall be docu mented at all times in a clear and concise comprehensible way 4 Our Operating Instructions shall be given to the employee operator working at the machine on which our protec tiveon eq...

Page 6: ...e field height can be doubled Fig 6 Fig 6 Two LGT safety light grid on a LGTN control unit Double protective field height LGTN 2 x LGTS 2 x LGTE max 1800 mm LGTN LGTS LGTE LGTN Terminals for sender an...

Page 7: ...ty distances and sufficient pro tective height are provided see 11 selection table Before the unit is installed check the components to ensure that they are complete The LGT Light Grid comprises 5 ind...

Page 8: ...ect the light beams and may prevent an object from being detected Fig 8 For this reason a minimum dis tance a between reflective objects and the optical axis straight line connection LGTS E must be ob...

Page 9: ...sure When using the con trol unit without an enclosure i e mounting in a control cubicle the the control unit chassis is clipped di rectly onto a DIN rail To improve EMC insulated moun ting on the pow...

Page 10: ...operating mode of the LGTN The status of the main and auxiliary relays depends on the status of the protective zone the operating mode With restart interlock or Without restart interlock and the comma...

Page 11: ...put Fig 17 Light grid not contaminated no output Light grid contaminated output live 7 8 RL 24V Fig 16 The semiconductor output gives the actual status of the protective zone Fig 17 Contamination semi...

Page 12: ...onitors the contacts of connected contactors to ensure that they are do not stick weld These must be connected to the LGT as shown in the connection diagram Fig 20 The contactor monitor monitors the s...

Page 13: ...strips are replaced 5 3 8 Blanking If mechanical brackets for guiding material are located in the protec tive zone this area must be blanked out For this purpose up to 4 beams on the LGT can be blanke...

Page 14: ...ing mode without restart interlock 30 ms 20 ms 30 ms 50 ms 25 110 ms approx 100 ms Control switch active passive Test input passive active Main relay closed open Auxiliary relay closed open Wait for c...

Page 15: ...equate due to contamination or alignment error red Lights up when protective zone interrupted Sender Receiver In operating mode without restart interlock In operating mode with restart interlock green...

Page 16: ...itor see 5 3 6 Contactor monitor Blanking procedure completed reset DIP switches Release Test button Release Machine Control button Check the sender and receiver type assignment Check connection syste...

Page 17: ...e machine operating company supplier 7 2 Regular checking of the safety device by qualified personnel Checks based on the applicable national regulations at the intervals specified therein These check...

Page 18: ...ve length of the sender 880 nm Protection class 1 Enclosure rating Light grid IP 65 Control unit IP 54 or IP 20 for cabinet installation Operating mode with or without restart inhibit Supply voltage U...

Page 19: ...b 015 5 185 155 030 11 335 305 045 17 485 455 060 23 635 605 075 29 785 755 090 35 935 905 32 5 259 5 409 5 559 5 709 5 859 5 0 7 5 M5 2 8 10 15 30 2 8 a x 72 5 25 12 5 159 5 15 b 51 5 only LGT 015 1...

Page 20: ...6 7 8 9 10 11 12 13 14 15 16 N L 200 188 150 119 23 30 36 26 5 30 23 24 75 SW 24 To receive cables Remove sleeve and prise apart 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 N L 70 170 126 57 Push the side...

Page 21: ...r output Protection field status Semiconductor output Contamination DC supply voltage 24 V Auxiliary relay output Main relay output AC supply voltage 115 230 V 0 V DIP switches LEDs Voltage selector 1...

Page 22: ...d when selecting an active optoelectronic protective device Action Note Regulations Protective zone width Protective zone height Resolution The responsible authorities and profes sional associations c...

Page 23: ...6 009 924 6 009 926 Control unit 24 VDC Control unit 115 230 V AC 24 V DC 24 V DC control unit for installation in a control cabinet 115 230 V AC 24 V DC control unit for installation in a control cab...

Page 24: ...e EN294 Yes No 7 Has the overall machine stopping time been checked and documented Yes No 8 Is the resultant safety distance observed between he danger point and the ESPE Yes No 9 Is the ESPE correctl...

Page 25: ...25 8 007 487 10 10 99 Technical Description LGT SICK AG Safety Systems Germany All rights reserved...

Page 26: ...1 Fax 44 1727 85 6767 I t a l y Phone 39 02 92 14 20 62 Fax 39 02 92 14 20 67 J a p a n Phone 8 13 33 58 13 41 Fax 8 13 33 58 05 86 N e t h e r l a n d s Phone 31 302 29 25 44 Fax 31 302 29 39 94 N o...

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