VESDA-E VES-A10-P Product Guide
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39
4.3.6
Relays
The relays, located on the main processor card, interface to the Fire Alarm Control Panel (FACP) to
communicate faults, alarms and disabled states. The relays can be programmed using Xtralis VSC. Relays 3
and 6 are permanently set for Urgent Fault and Fire 1 respectively. Table 4-22 below illustrates the default
assignments of functions (conditions) to relays and summarizes the default behavior of each relay. Section
5.5.12 describes how to configure the relay behavior using Xtralis VSC. It is possible to assign more than one
condition to a relay.
Fire 1 Relay
If a detector relay is to be used to signal fire alarm to the Fire Alarm Control Panel (FACP) then the Fire 1 relay
must be used.
Urgent Fault and Fire 1 Relay Terminals
The Urgent Fault relay is energized during normal operation while the Fire 1 relay is only energized when a Fire
1 is detected. The operation of these two relays is summarized in the following table.
Table 4-1: Urgent Fault and Fire Relay Operation
URGENT FAULT Relay
Fire 1 Relay
No Fault
(Energized)
Fault
or unpowered state
No Fire
(De-energized)
Fire
Relay Assignments and Behaviour
l
Relays 1, 2, 4, 5, 7, 8, 9, 10, 11, 12 are fully configurable.
l
Relays 3 and 6 are fixed to Urgent Fault and Fire 1 respectively. These relays may be assigned additional
conditions.
l
Relays 3 and 6 are changeover relays. (SPDT (1 Form C)) All the other relays are single pole single throw
(SPST-NO (1 Form A)).
Relay #
Default
Assignment
Default to
Normally
Energized
Description for default configuration
Configurability
1
Disable
(Isolate) and
Standby
No
Energizes when an operator disables
(isolates) the detector. Also energizes when
the operator puts the detector into Standby
mode.
Fully
configurable
2
Minor Fault
Yes
De-energizes when a Minor Fault is
detected.
Fully
configurable
3
Urgent Fault
Yes
De-energizes when an Urgent Fault is
detected.
Note that Relay 3 is fixed Normally
Energized in order to ensure that a fault will
be signaled when power to the VES-A10-P
is removed. See Table 4-1.
Urgent Fault
cannot be
removed. Other
conditions can
be added.
Fixed Normally
Energized
4
Alert
No
Energizes when the Alert alarm is initiated.
Fully
configurable
Table 4-2: Default Relay Assignments
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