20
October 2010
AUTOMATIKPRODUKTER
AUTOMATIKPRODUKTER
ATEX – Duct Smoke Detector
8.1.1
Terminal assignment in the connection box of the
LRS 04 Ex
In operation
De-energised/alarm
Fig. 8-03
Relay contacts and connection of the LRS 04 Ex
Terminal 1
24 V DC
Terminal 2
GND
Terminal EB
Equipotential bonding (internal only)
Terminal EB
Equipotential bonding (internal only)
Terminal 3
RS bus
Terminal 4
Potential-free relay contact: Com
Terminal 5
Potential-free relay contact: NO
Terminal 6
Potential-free relay contact: NC
8.2
Device functions and display elements of
the LRS 04 Ex
The evaluation electronics of the optical Smoke Switch ORS 221 Ex continuously
monitor the smoke sensing unit of the detector and signal the following condi-
tions by the integrated LED alarm:
Normal operation
LED flashing green (approx. every 4 seconds),
relay contact is closed
Minor contamination
LED flashing in alternating colours green/yellow
(approx. every 4 seconds), relay contact is closed
Heavy contamination
LED flashing twice in short succession green/
yellow (approx. every 4 seconds), relay contact is
opened
Failure
(failure of sensing chamber)
LED flashing yellow (approx. every 4 seconds),
relay contact is open
Alarm
LED flashing red (approx. once per second), relay
contact is open
