Lucent Technologies Lineage
®
2000 ECS-12U Controller J85501E-2
2 - 6 Product Description Issue 3 July 1998
The de-energized or alarm state of the relay is its normal state,
i.e., a closure exists between the “C” and “R” poles and an open
exists between the “O” and “R” poles.
All alarms are in the non-alarm state only when the control unit
is powered and the corresponding alarm is not present. When an
alarm occurs, the corresponding closure occurs. When the
control unit loses power, all alarms are issued.
An Alarm Battery Supply (ABS) and a ground return are
available on one of the terminal blocks (TB101). These pins may
be wired by the installer to one or more alarms on the terminal
blocks to drive alarm lamps, buzzers, or remote relays in the
office alarm system. ABS is the same voltage as the plant bus
voltage and is separately fused on the fuse board.
Battery on
Discharge Alarm
If rectifier output is insufficient to supply the load current for any
reason (such as an ac power failure), the battery reserve will
provide the necessary current. Such a battery discharge can be
detected by a drop in the plant bus voltage. Whenever the plant
voltage drops below a preselected threshold, the controller
issues a Battery on Discharge (BD) alarm and lights a red LED
on the controller front panel. This alarm threshold is typically set
to indicate the onset of battery discharge to allow enough time
for maintenance personnel to respond before battery reserve is
exhausted. When a BD alarm occurs, service is not usually
affected immediately. However, since attention is required in a
limited time, BD is considered a Major alarm, and all three
Power Major alarm groups are issued to the office alarm system
when a BD occurs.
It should be noted here that a BD alarm does not necessarily
indicate that rectifier output current has been lost or reduced. A
BD alarm can be caused by misadjusted rectifier output voltage
during otherwise normal operation. It can also be caused by
current overload on normally functioning rectifiers.
The voltage threshold for the BD alarm is selected by the user by
setting a group of DIP switches on the 113B. The setpoint is
typically at least 1 volt below the plant float voltage for nominal
48V plants or 0.5 volts below the float voltage in 24V systems.
This threshold avoids nuisance alarms due to component
tolerances, variations in load, and other transient conditions.
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