VESDA VLP Product Guide
VESDA by Xtralis
16
www.xtralis.com
3.3
Relays
The relays on the head termination card interface to Fire Alarm Control Panels to communicate faults, alarms
and isolate states. The relays can be programmed using PC based software or the LCD Programmer and can
be assigned multiple assignments. See the LCD Programmer Product Guide for details. Relays 3 and 6 are
permanently set for Urgent Fault and Fire 1 respectively and can be programmed for additional functions. The
table below illustrates default assignments for relays and assignment of multiple functions. It is possible to
assign the same function to more than one relay.
3.3.1
Relay Assignments and Conditions to Change States
Relays 1, 2, 4, 5 and 7 are fully configured. (For example, relay 5 could be configured to de-energize on Alert).
Note:
Assignments to Relays 3 and 6 are fixed to Urgent Fault and Fire 1 respectively. These relays may
be assigned additional assignments.
Relay #
Default
State changes
Latch
1
Isolate
Energizes when an operator isolates the
detector by pressing the Isolate key on the
Display Module or by activating the command
via a PC or a LCD Programmer or GPI option.
Unlatched
2
Minor Fault
De-energizes when a Minor Fault is detected.
Latched
3
Urgent Fault De-energizes when an Urgent Fault is
detected.
Latched
4
Alert
Energizes when the Alert alarm is initiated.
Latched
5
Action
Energizes when the Action alarm is initiated.
Latched
6
Fire 1
Energizes when the Fire 1 alarm is initiated.
Latched
7
Fire 2
Energizes when the Fire 2 alarm is initiated.
Latched
Table 3-3: Relay assignments and conditions to change state for 7 relays HTC
3.3.2
Relays Default Settings
Relay
1
2
3
4
5
6
7
Isolate
Minor Fault
Urgent Fault
Alert
Action
Fire 1
Fire 2
Table 3-4: Default relay assignment
Note:
A tick indicates the default setting. Relays 3 and 6 are permanently configured for Urgent Fault and
Fire 1 respectively. All other relays can be re-configured. More than one function can be configured
to any relay.
