SICK LGT 015

10
8 007 487/10-10-99 Technical Description • LGT © SICK AG • Safety Systems • Germany • All rights reserved
5.3.2 Switching outputs
The control unit has four switching
outputs, each of which performs
different functions.
‡ Main relay contact output
(
Fig. 14 ),
‡ Auxiliary relay contact output
(
Fig. 14 ),
‡ Protective Zone status
(PNP),
‡ Contamination output
(PNP)
The main relay with positively actu-
ated contacts is the "safety" switch-
ing output of the LGT. The posi-
tively actuated contacts are moni-
tored by the control unit to ensure
that they are functioning correctly.
The auxiliary relay with its switching
output operates as a second, inde-
pendent switch-off path should the
main relay or controller fail.
We recommend fitting arc suppres-
sors to the contactors at the
outputs. This will extend the lives of
the relays in the LGTN and
suppress interference from external
sources.
The output circuits must be
provided with adequate protection
(e.g. with fuses) in accordance with
draft standard EN 50 100.
Fig. 15 shows the funktion of the
switches for setting the 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
command and test inputs.
LGTN
On variants with external mode switches:
Observe the seven-segment display during swizches.
Furthermore, floating blanking – although possible (at least in Germany) – is
not permitted. May be subject to national standards and/or risk assessment.
Before carrying out blanking again always check the functioning of all
beams (without blanking). After setting the blanking check that only the
desired beams are in fact blanked out.
Fig. 14. Output circuit elements
Fig. 15. Operating mode settings on the control unit
SwitchSwitch
SwitchSwitch
Switch
PositionPosition
PositionPosition
Position
FunctionFunction
FunctionFunction
Function
No.No.
No.No.
No.
4 ON "Calibration" mode active
OFF "Calibration" mode inactive (ready)
3 ON Number of connected sensor pairs: 1
OFF Number of connected sensor pairs: 2
2 ON "Mask" mode active
OFF "Mask" mode inactive (ready)
1 ON Operating mode without restart interlock
OFF Operating mode with restart interlock
4
3
2
1
Switch
No.
ON OFF
13
K1
Auxiliary relay contact
14 15
K2
Main relay contact
16