Lucent Technologies Lineage
®
2000 ECS-12U Controller J85501E-2
Issue 3 July 1998 Product Description 2 - 11
Lucent Technologies J874 series three-phase ferroresonant
rectifiers connected, a phase alarm is treated as an ac fail. The
J874 series does not provide an ACF alarm for total loss of ac.
For J85503 or J85603 series rectifiers, a phase fail provides both
an RFA and ACF, and total loss of ac generates only an ACF
alarm.
Major and Minor
Fuse Alarms
The controller monitors all fuse and circuit breaker protection
devices in the plant. Each blown fuse or tripped circuit breaker
is classified as either a Major or Minor alarm. Major fuses or
circuit breakers protect service-affecting circuits, basic
controller circuits, and alarm circuits that report Major alarms.
Loss of any other circuit protectors are treated as Minor Fuse
Alarms. Examples of Major “fuses” include load circuit breakers
and the Alarm Battery Supply (ABS) fuse. Examples of Minor
“fuses” include regulation fuses of each rectifier.
A red MJF LED on the controller front panel will light in the
event of a Major Fuse Alarm. Similarly, a yellow MNF LED
lights following a Minor Fuse Alarm. Fuse alarms cause the
associated Power Major and Power Minor alarms to be issued to
the office alarm system. In addition, separate Major Fuse Alarm
and Minor Fuse Alarm transfer contacts are provided to the
office alarm system. Refer to Table 4-E for a list of contacts.
Open Battery
String Detection
and Alarm
In a plant equipped with battery string disconnects, the
disconnect switch on each battery string may be wired to the
controller to indicate when they are open. The open string signal
occurs when a battery string disconnect switch is turned off
manually or electronically. The Open String alarm (OS) is
passed as a separate alarm to the microprocessor board.
If the OS signal is wired directly to the controller alarm terminal
blocks, it will generate a Minor Fuse Alarm whenever a battery
string is open. Alternatively, OS may be hard-wired to the
auxiliary Major Fuse Alarm input on the fuse board.
Front Panel
Status Indicators
Light-emitting diodes (LEDs) are located on the controller front
panel to indicate the alarm status of the battery plant.
Yellow LEDs indicate the following conditions, including (but
not restricted to) Power Minor alarms:
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