FAI Connections
5–24 iSTAR Ultra Installation and Configuration Guide
FAI Connections
FAI Scenarios
FAI (Fire Alarm Interlock) is a hardware feature that will activate all enabled relays when the
F input of J84 opens. It is NC (Normally Closed).
The concept of activating relays when a fire is signaled can be used in two basic scenarios:
Unlock all doors when fire is present.
Remove power from various devices when fire is present.
The implementation could be a combination of both scenarios by selecting the correct NO or
NC contact of the relay.
Magnetic Door Locks have power applied most of the time with a break in the power to open
the door. You have to be aware of NO or NC in those cases also.
Set SW31 to True on the ACM that has the FAI/Key signals connected.
SW2, SW4, SW22, SW19, SW18, SW6, SW26, SW23 are the switches that allow the large relays
to be activated when FAI is True.
FAI Modes
There are two basic modes:
FAI without Latch - This method requires the F input (NC) of J84 plus the individual
enable switches for each relay (SW2, SW4, SW22, SW19, SW18, SW6, SW26, SW23). See
Figure 5-21 on page 5-25.
FAI with Latch and subsequent Unlatch - This method requires the F input of J84 plus the
individual enable switches for each relay, plus SW30 to enable the Latch and J84 K input
(NO) to reset the Latch. See Figure 5-22 on page 5-26.
FAI without Latch
This mode is fairly basic.
The normally closed F input goes true by opening.
The Relay Drive goes true and activates all relays that have their FAI enable switches on
(SW2, SW4, SW22, SW19, SW18, SW6, SW26, SW23).
The normally closed F input goes false by closing.
The Relay Drive goes false and deactivates all relays that have their FAI enable switches
on (SW2, SW4, SW22, SW19, SW18, SW6, SW26, SW23).
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