9
2.5 Alarms
2.5.1 Standard
Alarms
Two alarms are included as a standard feature of the A75D(E). The included alarms are a Summary alarm and
an AC Failure alarm. Each alarm includes two form C contacts enabling the customer to connect multiple
remote annunciators.
The
Summary Alarm
will trigger under any of the following conditions:
Low DC Voltage
Positive Ground
High DC Voltage
Negative Ground
High Voltage Shutdown
Battery End of Discharge
Low DC Current
Charger Failure
If an alarm condition occurs for longer than 5 seconds, the summary alarm relay will activate. When an alarm
activates the specific indicator on the front panel and the Alarm LED on the display membrane will light, any
connected remote annunciators will activate and the display will cycle through all active alarms.
The High
Voltage Shutdown alarm is triggered after 20 seconds.
A Charger Failure alarm occurs when one of the
following conditions are present: Simultaneous Low DC
Voltage and Low DC Current, or High Voltage
Shutdown. The charger failure alarm does not have a
specific LED, however the Alarm LED on the display
membrane will light and the alarm will be visible on the
display.
Alarms automatically reset when the alarm condition is
corrected. However the High Voltage Shutdown and the
Charger Failure alarms must be reset manually by
pressing the
(reset) button.
The
AC Failure Alarm
will trigger immediately when the AC power to the unit is lost. The alarm will
automatically reset when AC power is restored to the unit. When AC power is lost the front panel display and
indicators will remain powered by the connected batteries.
2.5.2 Discrete Alarm Relay Board (Option 46R)
As an optional accessory, La Marche offers a discrete alarm relay board.
The
S2A-198B
relay alarm board offers additional customer connection
for remote annunciators. The alarm relay board includes two form C
contacts for each of these specific alarms. In this way the customer
may be better informed of which specific alarm has triggered.
These relay contacts cover the following conditions: Low DC Voltage,
High DC Voltage, High Voltage Shutdown, Low DC Current, Positive
Ground, Negative Ground, Battery End of Discharge and Charger
Failure. A Charger Failure alarm occurs when one of the following
conditions are present: Simultaneous Low DC Voltage and Low DC
Current, or High Voltage Shutdown.
When Option 46R is purchased, the S2A-198B card is installed in
addition to the S2A-364 card.
Figure 7 - Standard Customer Connection Card
Figure 8 - Customer Connections to
Discrete Alarm Contacts
