SilentKnight SK-5208 Conventional FACP 10-30 Zone - Manual (Page 71)

Operation 151204
5-6
5.5.2 Double Interlock Releasing Operation
A typical double interlock releasing system would be programmed with a minimum of two zones selected for
“Cross Alert A”, one zone selected as “Man. Release A”, and one selected as “Interlock A”. Additional zones
can be selected as Cross Alert or Manual Release.
This double interlock system requires both cross alert and manual release verification zones. A single manual
release and interlock zone can be used without any cross alert zones. In this system configuration an active
manual release and the interlock zone is required to initiate the release.
Table 5-5 illustrates what will cause a Pre-alert, General Alarm, and a Release.
If no zones are selected for “Interlock” verification then the system will operate as a standard cross alarm
releasing system (see Section 5.5.1).
See Section 5.5.1.1 for default NAC settings for releasing systems.
5.6 Smoke Alarm Verification
Figure 5-6 illustrates how the Smoke Alarm Verification cycle operates.
Figure 5-6 Smoke Verification Cycle
During the Confirmation Period if there is no alarm indication then the system will return to normal operation.
Table 5-5: Double Interlock Operation
Inputs Output Results
Cross Zone 1 X X X X X X X X
Cross Zone 2 X X X X X X X X
Manual Release A X X X X X X X X
Interlock X X X X X X X X
Normal Pre-Alert Pre-Alert Ge
ner
a
l Al
arm
Ge
ner
a
l Al
arm
Ge
ner
a
l Al
arm
Ge
ner
a
l Al
arm
Ge
ner
a
l Al
arm
Ge
ner
a
l Al
arm
Ge
ner
a
l Al
arm
Ge
ner
a
l Al
arm
Relea
se an
d Gen
e
ral Ala
rm
Relea
se an
d Gen
e
ral Ala
rm
Relea
se an
d Gen
e
ral Ala
rm
Relea
se an
d Gen
e
ral Ala
rm
Relea
se an
d Gen
e
ral Ala
rm