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Lucent Technologies Lineage
®
2000 ECS-6 Controller J85501D-1
Issue 6 August 1998
Product Description 2 - 15
Major and Minor
Fuse Alarms
The LVD/Fuse Board provides Major and Minor Fuse Alarms to
the controller. A Major Fuse Alarm is generated when F510,
F511, or F512 opens, when a plant distribution circuit breaker
trips open for overcurrent (but not when manually turned off), or
when E502 is connected to the plant voltage. A Minor Fuse
Alarm is generated when any of the fuses F501-F509 opens,
when E503 is connected to the plant voltage, or when one or both
of the low voltage detection circuits attempts to open the LVD
Contactor (either under normal operation or in a fault situation.
See “Low Voltage Detection for Disconnect/Reconnect
Contactor” for further details.)
Low Voltage
Detection for
Disconnect and
Reconnect
Contactor
The LVD/Fuse Board provides sensing of the plant voltage for
use in controlling the Low Voltage Disconnect/Reconnect
Contactor in the battery plant. Although the actual Contactor is
an optional feature of the battery plant, the sensing circuits and
associated alarms are standard on all controllers. There are two
sense circuits on the LVD/Fuse Board, configured in a redundant
fashion so that both circuits must sense a low voltage before
opening the Contactor. P505.1 and P505.2 provide the user with
a choice of two disconnect voltages. Placing jumpers across pins
1 and 2 of 505.1 and 505.2 provides a disconnect voltage of
42.5V for 48V plants or 21.25V for 24V plants, while placing
the jumpers across pins 2 and 3 provides a disconnect voltage of
40.5V for 48V plants or 20.25V for 24V plants.
CAUTION
The two jumpers must be set for the same threshold. Each
jumper sets the threshold for one of the two redundant sense
circuits. If the jumpers are set for different thresholds, the
lower threshold will actually control the Contactor since
both circuits must sense a low voltage before opening the
Contactor.
Information on the state of the detection circuits and Contactor
is provided via two LEDs, connections to the controller's Minor
Fuse Alarm circuits, and a Form C contact closure available on
the 113A2. When one or both of the detection circuits senses a
low voltage, or if one of the detection circuits fails so that it
appears to have detected a low voltage, the yellow LVD/FAIL
LED will illuminate and a Minor Fuse Alarm will be sent to the
controller. If the battery plant is equipped with the LVD
Disconnect/Reconnect Contactor, the red LVD/OPEN LED will
illuminate when the Contactor is open either during normal
operation when a low voltage is detected, or in the unlikely event
of a Contactor failure. A Form C contact closure available on the