VESDA ECO Detector by Xtralis Product Guide
17898_05 Principles of Operation 27
Relay Contacts
The ECO unit uses Volt Free Relay contacts to indicate its local alarm status. In
default setting these relay outputs are switched in conjunction with the Activation of
the LEDs on the ECO Top surface (See Status Indicator Operation)
If the relay contacts of a detector are to be used to switch local visual or audible
alarms, the capacity of the contacts and the cabling requirements need to be
considered. Refer to previous section, Relay Connections, for details of the contacts
switching capacity and for details of how to configure the relays. The association of
the Relays and the Alarm meanings are detailed in Table 2 Alarm/Fault Relay
default Operation.
Relay Default Function
Contact Position
Powered &
Active
ECO
Unpowered
1 Sensor 1 or 2 Pre-Alarm OPEN CLOSED
2 Sensor 1 Alarm OPEN CLOSED
3 Sensor 2 Alarm OPEN CLOSED
4 Detector Fault OPEN OPEN
Table 2 Alarm/Fault Relay default Operation
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