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

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

5.3.5 Test input

The test input is used to initiate a
test cycle 

(Fig. 19)

. In doing so, the

LGT including the main 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 ouputs remain open. The
machine, therefore, cannot resume
operation. A break contact must be
connected to the test input.

5.3.6 Contactor monitor

The external contactor monitor
monitors 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 

static

 rest position of the exter-

nal contactors. If a 

dynamic

 contac-

tor monitor is specified, the moni-
tor must be integrated into the
higher-order controller.

3

4

+24V

1.2 k

Test contact

U

high

 > 15V

low

 <  5V

Contact closed:
Contact open:

no test
test

5

6

+24V

U

high

 > 15V

low

 <   5V

1.2 k

K1 K2

Contactor

Fig. 19. Test input circuit

Fig. 20. Contactor  monitor circuit

Note

Safety can only be guaranteed if the
test input is used (installed in the
machine controller).

Note

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" col-
umn gives the required measures.

If the contact monitoring is pro-
vided by externally connected de-
vices, terminals 5 and 6 must be
bridged.

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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