7
SLC 420
SLG 420
Operating instructions
Safety light curtain/safety light grid
EN
2.9.7 Start interlock
The start interlock prevents an automatic start of the machine when the
supply voltage is switched on After enabling the start interlock - by the
one-time interruption of the protection field -, this protective function is
deactivated until the next power reset
The start interlock is not activated upon delivery This
function is activated by means of the NSR-0801 BUS
converter and a PC or laptop
2.10 Self-test
The system performs a complete self-test within 2 seconds after the
operating voltage has been switched on If the protection field is not
interrupted, the system switches to the ON condition In case of an
error, the outputs at the receiver do not switch to the ON state The LED
OSSD OFF starts flashing, thus emitting an error message For more
information, refer to chapter Fault diagnosis
During operation, the system continuously executes a self-test Safety-
relevant faults are detected within the cycle time and cause the outputs
to be switched off
2.11 Beam coding A
The beam coding of the safety light curtain must be adjusted, when
systems operating in each other's vicinity and a set-up as shown in
the image below (no interference) is impossible With beam coding
A, a receiver can distinguish the beams of the transmitter with the
same beam coding A, which are destined to this particular receiver,
from foreign beams The beam coding A must be set for each sensor
(receiver and transmitter) individually The function is activated by
means of the NSR-0801 BUS converter and a PC or laptop
If adjacent systems are operated without beam coding A,
the user is at risk
E
E
R
R
No interference
E
R
R
E
Interference:
beam coding A required!
• The beam coding A avoids mutual interference of adjacent systems.
• The beam coding A is permanently shown by the transmitter and the
receiver by means of flashing LED's (refer to LED status information)
The response time of the system is increased when beam
coding A is used To this end, the safety distance must be
adjusted to the hazardous movement Refer to chapter
Response time
3. Mounting
3.1 General conditions
The following guidelines are provided as a preventative warning notice
to ensure safe and appropriate handling These guidelines are an
essential part of the safety instructions and therefore must always be
observed and respected
• The SLC must not be used on machines, which can be
stopped electrically in case of emergency
• The safety distance between the SLC and a hazardous
machine movement must always be observed and respected
• Additional mechanical safety guards must be installed so that
the operator has to pass by the protection field to reach the
hazardous machine parts
• The SLC must be installed so that the personnel always must
be within the detection zone when operating the machine An
incorrect installation can lead to serious injuries
• Never connect the outputs to +24VDC If the outputs are
wired to +24VDC, they are in ON state, as a result of which
they are unable to stop a hazardous situation occurring on the
application/machine
• The safety inspections must be conducted regularly
• The SLC must not be exposed to inflammable or explosive
gasses
• The connecting cables must be connected in accordance with
the installation instructions
• The fixing screws of the end caps and the mounting angle
must be firmly tightened
3.2 Protection field and approach
The protection field of the SLC consists of the entire range located
between the protection field markings of transmitter and receiver
Additional protective devices must ensure that the operator has to pass
by the protection field to reach the hazardous machine parts
The SLC must be installed so that personnel are always located within
the detection zone of the safety device when operating the hazardous
machine parts to be secure