OAS alarm and Control Circuits 6-7
DMS-100 Family Alarm System Description Reference Manual BASE12
voltage reaches a threshold. You can set the threshold by selecting one of
the dip switch settings in listed the following table.
Dip switch setting Threshold range
HI –49.4 V to –50.5V
MED –47.8V to – 48.8V
LOW –46.6V to –47.7V
TEST –73.9V to –76.1V
The correct dip switch setting depends on the battery voltage in the office.
The HI setting is appropriate for most offices. The TEST setting is used to
test low battery voltage detection. You must reset the dip switch
immediately after you test low battery voltage detection capability.
Note: You must select only one dip switch setting at a time. The selection
of more than one setting changes the threshold to an incorrect value. This
condition can trigger a false low battery voltage alarm.
You use datafill in tables ALMSCGRP and ALMSC to assign the low
voltage scan point on the NT3X82 card. When low battery voltage detection
is active, the system generates a major alarm and a corresponding log report
to notify maintenance personnel. The system generates a log report every 15
seconds as long as a low voltage condition exists.
Low power alarm system
The low voltage detector switch, present in previous NT3X82 versions, is a
seven-position dip switch that sets the range for monitored ABS voltage. If
the ABS voltage drops below the alarm condition threshold, the alarm
system generates an alarm. This feature is not ISG-compliant and is not
available on earlier –60V versions on the NT3X82. The following table
contains dip switch information.
Dip switch functions
Switch Label Application Alarm generation thresholds
1 HIGH (domestic) –48V –49.5V to –50.5V
2 MED (domestic) –48V –47.5 V to –48.5V
3 LOW (domestic) –48V –45.5V to –46.5V
—continued—
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