6.3 Troubleshooting
The prerequisite for the troubleshooting process is a correctly adjusted light barrier (refer to Section 6.2)
Please observe: Solvents can damage the plexiglass panels of the transmitter and receiver. As an alternative, light barriers
with silicate glass can be delivered. Welding spots can burn into the silicate glass panels. This is prevented by a
replaceable protective panel made out of PVC.
Maintenance information: The ULVT... system is maintenance-free depending on the construction. The protective panels in
front of the transmitter and receiver should simply be cleaned at regular intervals with a solvent-free detergent. This does not,
however, release the obligation to carry out the prescribed annual inspection pursuant to EN 61496, ZH 1/281 and/or ZH
1/597.
FIESSLER
E L E K T R O N I K
20
Operating / fault status
Possible causes
Remedy
Yellow LED off
No power supply
Check power supply
Yellow LED flashing
Internal error, transmitter inactive
Switch off power supply and then
switch on again. If yellow LED still
flashes: Transmitter defective, replace
transmitter
6 Commissioning
- Troubleshooting
Transmitter
Operating / fault status
Possible causes
Remedy
No LED illuminated
No power supply
Check power supply
Green LED off
Red LED on
Orange LED on
Yellow LED off
a) Transmitter inactive
b) Light path interrupted
c) Light barrier maladjusted or very dirt
d) Max. range exceeded
a) Check transmitter
b) Remove obstacle from light path
c) Readjust and/or clean system
d) Check range
Green LED off
Red LED on
Orange LED off
Yellow LED on
(no fault)
Operating mode with restart interlock
active, prompt for start release
Press start button
Green LED off
Red LED off
Orange LED on
Yellow LED off
a) Insufficient reserve, light barrier
maladjusted or slightly dirty
b) Max. range exceeded a) Readjust
and/or clean system
a) Readjust and/or clean system
b) Check range
Green LED and/or
Orange LED flashing
a) In operating mode with contactor
check: Contactors not responding or fal-
len
b) Operating mode setting does not
match the electric wiring and/or DIP
switches are not set as specified in
Sect. 3.5.
c) Internal error
a) Check auxiliary contact k1 and k2
and/or wiring
b) Check operating mode setting
c) Switch off power supply and then
switch on again
If LED still flashes: Check operating
mode setting; if correct mode set -
receiver defective, replace receiver.
Receiver
interdiction de
redŽmarrage
Wiederanlauf
Justierhilfe
LS
LS frei
restart interlock
adjustment
LC interrupt
LC free
Aide d«ˆjustement
libre
interrompu
unterbrochen
sperre
Sender ein
Transmitter on
Emetteur en
marche
interdiction de
redŽmarrage
Wiederanlauf
Justierhilfe
LS
LS frei
restart interlock
adjustment
LC interrupt
LC free
Aide d«ˆjustement
libre
interrompu
unterbrochen
sperre
interdiction de
redŽmarrage
Wiederanlauf
Justierhilfe
LS
LS frei
restart interlock
adjustment
LC interrupt
LC free
Aide d«ˆjustement
libre
interrompu
unterbrochen
sperre
interdiction de
redŽmarrage
Wiederanlauf
Justierhilfe
LS
LS frei
restart interlock
adjustment
LC interrupt
LC free
Aide d«ˆjustement
libre
interrompu
unterbrochen
sperre
Sender ein
Transmitter on
Emetteur en
marche
BA - ULVT
