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HA71 Digital Gas Controller
2.3.2 10-0195 Discrete Relay "Failsafe" Mode
10-0195 Discrete relay options may also be configured to function in
a Failsafe mode using the System Setup menu shown in Figure 2-11.
Entering YES causes these discrete relays to have energized coils
when no alarm condition exists for the associated channel and de-
energized coils when the alarm occurs. Failsafe is useful for indicating
failed relay coils and loss of power conditions.
CAutIoN
10-0195 zoning jumpers (see
Discrete Relays menus are set for failsafe. Zoning jumpers cause
ANY relay in the zone to energize ALL other relays in the same zone.
Zoning of failsafe relays may be accomplished with wiring at the
relay contact terminals.
Figure 2.12. Failsafe Mode
HA71 Technical Manual
Figure
3-5) should not be used when
2.3.3 Common Horn Relay and Local Piezo
The HA71 is equipped with a low decibel audible piezo which chirps
when keys are pressed and may be configured to audibly indicate
alarm conditions. The common horn relay is similar to the common
A1 and A2 common relays.
Figure 2-13. Common Horn Relay and Local Piezo Menu
•
Turning
Piezo Alarm ON causes the audible piezo to duplicate
the action of the horn relay. This feature may be used to provide
a low decibel indication of the status of the system's horn.
•
Alarm 1 & Alarm 2
each channel will affect the common horn relay. Choices are
OFF, ON or BEEP (one Hz. Pulsating). As an example, A2
conditions might pulse the horn (BEEP) and A1 conditions to
cause a steady horn (ON). Any other combination of these 3
choices is possible for A1 and A2 levels affecting the horn relay.
This feature is very useful since it allows the horn relay to serve
as another level A1, level A2, or both; for channels 1-16, 1-8
or 9-16. Individual channel alarms may also be configured to
not affect the Horn relay on a channel by channel basis (see
Section
2.2.2).
•
Failsafe & Horn Group
descriptions for menus Common Relay 1 and Common Relay
2 in
Section
2.3.1.
•
Turning
Acknowledge OFF allows the common Horn relay to drive
devices other than horns or sirens such as a light or a fan.
2-10
menus control how this alarm level from
menu entries are identical to the
Revision 3 (04/08)
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