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IMPROPER SCANNING RANGE INDICATION
If no jumper for the scanning range (jumper 2) is set or if the jumper is set in a not indicated position, the emitter does not
work. However, the scanning range indicator R3 remains lit on, indicating that the power is applied to the emitter.
2.5 Indicators
The FF-SYA Series emitters have five LED indicators. The receivers have four LED indicators. These LED indicators provide
important information related to the light curtain status.
Figure 2-9 Emitter Indicators
2.5.1 Scanning range indicators (emitter)
R3
R2
Maximum scanning range
The emitter is equipped with a scanning range selector for the control of the infrared emission power. The scanning range
indicators are 3 yellow indicators which give an information on the selected scanning range.
When the maximum emission power has been selected, the nominal scanning range can be achieved and three LEDs R1, R2
and R3 are lit on permanently. Lit on LEDs R2 and R3 indicate, that a medium emission power had been selected and
scanning range is decreased to medium.
When emission power and nominal scanning range are decreased to MEDIUM respectively MINIMUM, then only two LEDs (R2
and R3) or respectively one LED (R3) remain permanently on (for further information, see chapter 2.4.6 Scanning Ranges).
2.5.2 Alarm indicator (emitter)
The alarm indicator is a red LED that flashes if the emitter is detecting an emission problem. The receiver is in an alarm state
and the emitter needs to be changed for correct operation. If this LED is off while the receiver is in an alarm state despite the
sensing field is clear, then the receiver may be suspected.
2.5.3 Test Indicator (emitter)
FF-SYA Series light curtain provides a connection for testing the state of external contacts in case of long machine working cycle.
The test contact allows verification of external safety-related electromechanical components before each machine cycle. When the
contact in the external test circuit is actuated, the FF-SYA Series light curtains switches to the alarm state. The red test indicator of
the FF-SYA emitter turns on and the static safety outputs of the FF-SYA receiver remain open while the test contact is actuated.
The customer is responsible for providing the external test circuitry (See Chapter 4 Electrical Connections).
107094-10-EN FR26 GL O 103 Printed in France
R1
R3
Medium scanning range
Alarm
Normal operation
Red
Test
Normal operation
Red
R1
Scanning range indicators (yellow)
R2
R3
Alarm indicator (red)
alarm
test
Test indic ator (red)
R2
R1
R3
R2
R1
Minimum scanning range
Alarm
Emitter failure
Red
Test
Test mode
Red
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