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5.3.
Troubleshooting
POWER APPLIED TO MACHINE CONTROL SYSTEM
Before intervention, turn off and disconnect power from FF-LS Series safety light curtain and machine.
Failure to comply with these instructions could result in death or serious injury.
If a protective safety equipment (FF-LS safety light curtains or machine safety control equipment monitored by the FF-LS)
failure occurs during self-check or test input, the protective safety equipment is locked in an OFF condition. This OFF
condition cannot be defeated by turning the power supply voltage OFF and ON.
Table 5-4 Troubleshooting chart
Failure
Sensing field is clear, but the protective
safety equipment will not release after
actuation of an external reset push button
switch.
Green LED indicator is illuminated.
Sensing field is clear, but the protective
safety equipment will not release after
actuation of an external reset push button
switch.
Red LED indicator is illuminated.
Sensing field is clear, but the protective
safety equipment will not release after
actuation of an external reset push button
switch.
No LED indicator is illuminated.
During normal operation the red LED 5,
located near microprocessor on circuit
board in control unit (see Figure 5-2),
pulses (illuminates) every 3 seconds.
If there is no release when the sensing
field is clear, the red LED 5 may:
Illuminate continuously
Flicker one time
Flicker two times
Flicker three times
Flicker four times
Flicker five times
37
Possible cause
Open circuit between output relays
and machine control circuitry.
Blown fuse at output relay terminals.
Open circuit between both or one of
the sensing units and the control unit.
Translucent surface of sensing units
are contaminated.
Sensing unit is defective.
Faulty reset pushbutton or open
circuit.
No supply voltage to the control unit.
Blown fuse at supply voltage terminal.
Faulty synchronization
Faulty self test
Faulty communication
Faulty communication sensor A
Faulty communication sensor B
Faulty installation parameters
Inspect and repair
Inspect terminal wiring and, if
necessary, repair wiring.
Replace fuse.
Ensure correct terminal polarity and
proper cable connection between the
sensing and control units.
Clean surface.
Replace sensing unit (matched pair).
Replace reset pushbutton or repair
wiring.
Inspect terminal wiring and, if
necessary, repair wiring.
Replace fuse. See fuse
replacement. (see chapter 5.4.1)
Replace control unit.
Replace control unit.
Replace matched sensor units.
Visually inspect cable pair and
replace if required.
Visually inspect sensor cable A and
replace if required.
Visually inspect sensor cable B and
replace if required.
Visually inspect compatibility of
sensor and control unit components.
Ensure the beam number labels on
all of the components are the same.
107022-16 EN FR26 GLO 301 Printed in Germany
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