VESDA VLQ Product Guide
VESDA by Xtralis
22
www.xtralis.com
4.2
Wiring
The terminal block connectors located on the underside of the VESDA VLQ detector will accept 0.2 - 2.5 mm²
or 30-12 AWG wire sizes.
4.2.1
Cabling Inlet
There are two cabling inlet ports. The ports are fitted with rubber grommets. They are not intended for wiring
conduit connections. System designs that use conduit must use the optional brackets and junction box.
4.2.2
Wiring Terminals
The wiring terminals are located beneath the detector (Figure 1-1), and are accessible when the detector has
been detached from the detector base.
0V
+24V
NO
NC
COM
NO
COM
NO
NC
COM
-
+
POWER
FAULT
ALARM
PRE-ALARM
GPI
Figure 4-12: Wiring Terminals
4.2.3
Relays
The relays interface to the Fire Alarm Control Panel (FACP) to communicate fault and alarm states. Refer to
Figure 4-12 above for the location of the relay terminals.
FAULT, PRE-ALARM and FIRE Relay Terminals
The FAULT relay is energized during normal operation while the PRE-ALARM and FIRE relays are only
energized when the respective alarm thresholds are exceeded after the configured time delay. The operation
of the relays are summarized in the following table.
FAULT Relay
PRE-ALARM and FIRE Relay
Normal Operation
(Energized)
Fault
or un-powered state
Normal Operation
(De-energized)
Pre-Alarm or Fire
Table 4-1: Fault and Fire Relay Operation
