Faults and fault analysis/fault diagnostics
28
SLS 78/R
Leuze electronic
Review-Stand, , 17. March 2016
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ITALIA
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9
Faults and fault analysis/fault diagnostics
Fault
Possible causes
Test and fault removal
LED does not light in
transmitter or receiver
Supply voltage not present
Turn on main switch on the machine;
check fuse in feed line
Short circuit in the receiver
Turn off main switch and wait 10 sec.
until the electronic fuse in the receiver
switches on again
LED in transmitter does not
light
Supply voltage on transmitter
not present; connection cable
defective
Check supply voltage on the
connection terminals
Short circuit in the transmitter Switch off main switch and wait 10
sec. until the electronic fuse in the
transmitter switches on again
Transmitter activation (jumper
3-4) interrupted
Check circuit
LED in transmitter lights; LEDs
in the receiver do not light
Supply voltage on receiver not
present; connection cable
defective
Check supply voltage on the
connection terminals
Short circuit in the receiver
Turn off main switch and wait 10 sec.
until the electronic fuse in the receiver
switches on again
Interruption on relay contact;
relay defective; transmitter
defective
Send device in for repair
Red LED in receiver lights; no
light reception
Devices or deflecting mirror
misaligned
Realign devices or deflecting mirror
Optics or deflecting mirror
dirty
Clean optics/deflecting mirror
Jumper 3-4 in transmitter
interrupted
Check activation
Receiver defective
Send device in for repair
Red LED in receiver lights;
yellow LED in receiver flashes
Devices or deflecting mirror
misaligned
Realign devices or deflecting mirror
Optics or deflecting mirror
dirty
Clean optics/deflecting mirror
Red and yellow LED in
receiver light constantly
Electronic monitoring circuit of
the receiver has responded;
cause is, e.g. the reciprocal
influence of two SLS 78/R pairs
Switch supply voltage on receiver on
and off (at least 2 sec.);
Check beam path of the sensors
Receiver defective
Send device in for repair
