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107062-12 EN FR26 GLO 501 Printed in France
Troubleshooting Procedures
When the FF-SB Series safety light curtains are working properly and the sensing field is not interrupted, the
emitter LEDs E1 and E2 (yellow) are both illuminated, the receiver LED R3 (green) is illuminated, and all
other LEDs are NOT illuminated. If this condition is not met, refer to the following troubleshooting chart, flow
diagram (see figure 4-3) and corresponding repair procedures.
Troubleshooting Chart
(see figure 4-2 for indicator information)
Symptom
Probable Cause
Corrective Action
E1: ON / E2: ON
R1: ON / R2: ON
R3: ON / R4: flickers.
Relay contact stuck in
the closed condition.
Immediately, exchange the relay board (see chapter 8.4).
All light emitting diode
(LED) indicators are
NOT illuminated.
No power.
Ensure fuse is not blown (see Fuse Replacement procedure).
Ensure supply voltage is correct; as specified (see Specifications).
Ensure electrical power connections are secure and correct (see
Electrical Connections chapter).
LED E1, E2, R1, R2
and R4 are illuminated.
Test input is open.
Ensure the external circuit wiring connection between pins C4 and B3
on the receiver connector is secure (see Electrical Connections
chapter).
LED E1 and R2 are
illuminated, R4 and E2
are NOT illuminated.
Sensing field may be
obstructed.
Emitter and/or receiver
units need to be
cleaned.
Emitter and/or receiver
units need to be
aligned.
Emitter and/or receiver
unit internal error.
Remove obstacles interrupting sensing field.
Clean emitter lens, receiver lens and mirrors (see Emitter and Receiver
Cleaning).
Align emitters, receiver and mirrors.
Replace emitter and/or receiver unit.
LED E1, E2 and R2
are illuminated, R4 is
flickering.
Light curtain is in cycle
start mode.
Ensure monitoring loop connections between pins C3 and C5 are
secure. (see Electrical Connections chapter).
Press cycle-start push-button.
LED E1, E2 and R3
are illuminated, R1 is
flickering.
Emitter and/or receiver
units is contaminated.
Emitter and/or receiver
units is misaligned.
Clean emitter lens, receiver lens and mirrors (see Emitter and Receiver
Unit Cleaning section).
Align emitters, receiver and mirrors.
Random alarms
without apparent cause
(i.e., erratic outputs,
flickering LEDs).
Line voltage transients
greater than IEC 801-4
Norm standard.
Unacceptable ambient
light interference.
Ensure the correct supply voltage is provided (see Electrical
Connections chapter).
Ensure RC elements on the inductive loads are present (see Electrical
Connections chapter).
Ensure external circuit connection to pins C4 and C5 on the receiver
connector are secure (see Electrical Connections chapter).
Ensure ground connection on emitter and receiver are secure (see
Electrical Connections chapter).
Use a special optical filter (see Order Guide).
LEDs E1, E2 and R3
are NOT illuminated, or
other LEDs are
illuminated.
External relays may
not be working.
Refer to system wiring diagram and ensure the external relays
connected to or linked with the safety light curtain are operating
properly (see Electrical Connections chapter).
