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Operation
P/N 151204
5-7
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.
Table 5-5: Double Interlock Operation
Inputs
Output Results
Cross Zone 1
Cross Zone 2
Manual
Release A
Interlock
Normal
Pre-Alert
Pre-Alert
Ge
neral Alarm
Ge
neral Alarm
Ge
neral Alarm
Ge
neral Alarm
Ge
neral Alarm
Ge
neral Alarm
Ge
neral Alarm
Ge
neral Alarm
Release and General Alarm
Release and General Alarm
Release and General Alarm
Release and General Alarm
Release and General Alarm
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