Honeywell FF-SB12 Series Installation Manual page 54

IMPROPER RELAY OUTPUT BOARD MAINTENANCE
After a period of extended operation, it is possible that a switching relay can malfunction such that it remains
stuck of fused in the closed position following a breach of the light curtain's protection field and the shutdown
of the machine.
In the case of such a relay malfunction, the machine will not restart following the clearing of the protection
field (and pressing of the restart button when in manual restart mode) and the following warning diagnostic
LED condition will be seen on the light curtain receiver unit:
R2 (red) ON
It is essential to immediately replace the relay board upon the first occurrence of a stuck or fused relay and
the activation of the receiver operation status LED R2.
Failure to comply with these instructions will result in death or serious injury.
Figure 4-2 Emitter and Receiver LEDs
Emitter LEDs
Supply voltage
LED
E1
E2
R1
R2
R3
R4
Test Plug Construction
Using Female Plug Connector FF-SBZ1721137,
connect pins A4 and A5 to supply voltage and the
ground pin to earth ground. Also jumper the following ground pin to earth ground.
Emitter Board Visual Test
1. Clean the front lens window of the emitter.
2. Place your eye against the emitter front lens window and observe the presence of a low energy red light
(a spot) in the middle of each beam (except synchronization).
3. If you can observe the presence of this red light, the emitter is working correctly. If you cannot, replace
the faulty emitter board.
107062-12 EN FR26 GLO 501 Printed in France
R1 (red) OFF R4 (yellow) FLASHING
Marginal signal
Synchronization
beam
Clear sensing
field
Location
Emitter
Emitter
Receiver
Receiver
Receiver
Receiver
(see troubleshooting flow diagram, sheet 1 of 2)
Emitter Female Plug Connector
FF-SBZ1721137
(see troubleshooting flow diagram, sheet 2 of 2)
Receiver LEDs
Color Function
Yellow Supply voltage on
Yellow Synchronization beam detection
Red Marginal signal detection
Red Interrupted sensing field
Green Clear sensing field
Yellow Illuminated = test, Flickering = restart required
Receiver Female Plug Connector
Using a Female Plug Connector FF-SBZ1721202,
connect pins A4 and A5 to supply voltage and the
pins: C4, C5, B3 and C3.
Interrupted
sensing field
FF-SBZ1721202
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