16
SafeGuard Controller User Manual
MAN-0115 Rev 0
2.3.1
COMMON ALARM RELAYS 1 & 2
READ THIS SECTION CAREFULLY AND TEST ALL SETTINGS BY
SIMULATING INPUT CONDITIONS THAT SHOULD ACTIVATE
THESE ALARM RELAYS!
Common Relay 1
&
Common Relay 2
menus are identical and therefore discussed
only once. It is very important to fully understand these menus since they determine the
functions of each common relay.
Figure 2.10
•
The
Group
menu entry offers additional flexibility by controlling which channels
trip this menu’s common alarm relay. The 3 choices are
1-16
,
1-8
or
9-16
. Some
applications have different types of detectors, or, detectors in different areas
connected to the same SafeGuard Controller. In these cases, it may be undesirable for
a detector on channel 9 to trip the same relay as a detector on channel 2. The
Group
menus may restrict this. For example, channels 1-8 might be set to trip common relay
1 while channels 9-16 trip common relay 2. Another possibility is channels 1-8 be set
to trip common relay 1 while channels 9-16 trip relays on an optional discrete relay
PCB configured for Alarm 1 (see section 3.1.2).
•
Failsafe
controls relay activation for this common relay.
Failsafe
ON
causes the
relay to de-energize during alarm conditions and energize when there is no alarm.
Thereby, a power failure forces the relay contact to the alarm position. Note the
common Fault relay is always failsafe and may be monitored separately to indicate
loss of power conditions in many applications.
•
A1 and A2 Votes
allows creation of logical AND function equations that control
common relay 1 & common relay 2. Default settings for common relay 1 are
A1
Votes = 01
and
A2 Votes = 00
which causes relay 1 to trip if any channel has an
A1 level alarm active. Default settings for common relay 2 are
A1 Votes = 00
and
A2 Votes = 01
which causes relay 2 to trip if any channel has an A2 level alarm
active. Example: If either default setting is modified such that
A1 Votes = 02
and
A2 Votes = 01,
then any two channels must have an A1 level alarm active and any
one channel must have an A2 level alarm active to trip that relay. REMEMBER!
One of the A1’s and the A2 could be on the same channel. These level alarms must
come from a channel included in the
Group
entry described above.
!
