Lucent Technologies LINEAGE 2000 ECS-12 User manual

Product Manual
J85501D-2
Select Code 167-790-033
Comcode 106483779
Issue 3
August 1998
Lucent Technologies
Lineage®2000
ECS-12 Controller
Notice:
Every effort was made to ensure that the information in this
document was complete and accurate at the time of printing.
However, information is subject to change.
©1998 Lucent Technologies
All Rights Reserved
Printed in U.S.A.

Lucent Technologies Lineage®2000 ECS-12 Controller J85501D-2
Issue 3 August 1998 Table of Contents - 1
Table of Contents
1 Introduction
General Information 1 - 1
Customer Training 1 - 3
Customer Service 1 - 3
Technical Support 1 - 3
Product Repair and Return 1 - 3
Warranty Service 1 - 3
2 Product Description
Overview 2 - 1
Basic Controller 2 - 3
Operating Voltage 2 - 3
Batteryless Operation 2 - 4
Rectifier Sense Leads 2 - 4
Office Alarm Contacts and Alarm Battery Supply 2 - 4
Battery on Discharge Alarm 2 - 5
Selective High Voltage Shutdown 2 - 6
Automatic Rectifier Restart 2 - 8
Rectifier Fail Alarm 2 - 9
AC Fail Alarm 2 - 9
Major and Minor Fuse Alarms 2 - 10
Open Battery String Detection and Alarm 2 - 10
Front Panel Status Indicators 2 - 10
Front Panel Meter 2 - 11
Ammeter Scale 2 - 11
Front Panel Test Jacks 2 - 12
Rectifier Sequence Control Interface 2 - 12
Float and Equalize Control 2 - 12
LVD/Fuse Board 2 - 14
Power and Sense Voltage Fusing 2 - 14
Major and Minor Fuse Alarms 2 - 14
Low Power Distribution 2 - 15
Spare Fuses 2 - 15
Low Voltage Detection for Disconnect and
Reconnect Contactor 2 - 15
Controller Options 2 - 16

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2 - Table of Contents Issue 3 August 1998
Microprocessor Board 2 - 16
Datalogger Board 2 - 17
Mixed Types of Rectifiers in One Plant 2 - 17
Controller Specifications 2 - 18
3 Ordering Information
Controller 3 - 1
Kits 3 - 3
Spare Parts 3 - 4
Documentation 3 - 4
4 Installation and Setup
Introduction 4 - 1
Tools Required 4 - 1
Shipped-Loose Unit Installation 4 - 1
Preparation 4 - 1
Default Factory Settings 4 - 2
Controller Configurations 4 - 3
Frame Mounting 4 - 4
Hardware Setup 4 - 4
Voltage Selection 4 - 5
Equalize Enable/Disable 4 - 6
Automatic Restart Enable/Disable 4 - 6
Ammeter Scale 4 - 7
Battery on Discharge Threshold 4 - 7
High Voltage Shutdown Thresholds 4 - 8
Rectifier Restart Group Isolation 4 - 8
Low Voltage Disconnect Threshold (Optional) 4 - 8
Wiring 4 - 10
Basic Controller 4 - 10
Microprocessor and Datalogger Boards 4 - 14
Circuit Pack Installation 4 - 14
Replacement of Multiplexing Board 4 - 17
5 Acceptance Testing
Test Procedures 5 - 1
Meter Calibration 5 - 2
Battery on Discharge Alarm Test 5 - 2
Float and Equalize Control Test 5 - 3
High Voltage Shutdown and Restart Test 5 - 4
Fuse Alarm Test 5 - 6
Remote On/Off (TR Signal) Test 5 - 7
Bulk Ringer Alarm Test 5 - 8

Lucent Technologies Lineage®2000 ECS-12 Controller J85501D-2
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Low Voltage Battery Disconnect Test 5 - 9
6 Operation
Front Panel Switches and Indicators 6 - 1
7 Troubleshooting
Tables and Flowcharts 7 - 1
8 Product Warranty

Lucent Technologies Lineage®2000 ECS-12 Controller J85501D-2
Issue 3 August 1998 List of Figures - 1
List of Figures
Figure 1-1: ECS-12 Controller 1 - 1
Figure 1-2: Typical ECS Controller Application 1 - 2
Figure 2-1: Top View of ECS-12 Controller 2 - 1
Figure 2-2: ECS-12 Controller Block Diagram 2 - 2
Figure 2-3: Detail of 113B Control Unit Display Panel 2 - 3
Figure 4-1: ECS-12 Controller Backplane 4 - 5
Figure 4-2: CP1 Jumper and Switch Locations 4 - 6
Figure 4-3: CP1 DIP Switch Settings 4 - 7
Figure 4-4: LVD/Fuse Board (CP5) Jumper Locations 4 - 9
Figure 4-5: Typical Alarm Application Schematic 4 - 15
Figure 4-6: Typical Alarm Wiring Examples 4 - 16
Figure 4-7: Rectifier Multiplexing Circuit Pack 4 - 17
Figure 7-1: Office Alarms Received 7 - 3
Figure 7-2.1: 113B Control Unit Has Lost Power 7 - 4
Figure 7-2.2: 113B Control Unit Has Lost Power
(continued) 7 - 5
Figure 7-2.3: 113B Control Unit Has Lost Power
(continued) 7 - 6
Figure 7-3.1: Verify Controller Alarms 7 - 7
Figure 7-3.2: Verify Controller Alarms (continued) 7 - 8
Figure 7-3.3: Verify Controller Alarms (continued) 7 - 9
Figure 7-3.4: Verify Controller Alarms (continued) 7 - 10
Figure 7-3.5: Verify Controller Alarms (continued) 7 - 11

Lucent Technologies Lineage®2000 ECS-12 Controller J85501D-2
2 - List of Figures Issue 3 August 1998
Figure 7-4: Display Is Not Lit 7 - 12
Figure 7-5: Meter Out of Calibration 7 - 13

Lucent Technologies Lineage®2000 ECS-12 Controller J85501D-2
Issue 3 August 1998 List of Tables - 1
List of Tables
Table 2-A: ECS-12 Controller Electrical Specifications 2 - 18
Table 2-B: Battery Plant Alarm Voltage Ranges 2 - 19
Table 2-C: ECS-12 Controller Physical Specifications 2 - 19
Table 3-A: ECS-12 Controller Ordering Information 3 - 1
Table 3-B: Additional Ordering Information 3 - 3
Table 3-C: Recommended Spare Parts 3 - 4
Table 4-A: Default Factory Settings for Non-X
Controllers 4 - 2
Table 4-B: CP2 DIP Switch Settings 4 - 3
Table 4-C: Controller Jumper Settings 4 - 4
Table 4-D: Terminal Block Pin Assignments
for LVD/Fuse Board 4 - 9
Table 4-E: Terminal Block Pin Assignments
for 113B Control Unit 4 - 10
Table 6-A: Front Panel Switches and Indicators 6 - 1
Table 7-A: Troubleshooting Table, Backplane Connector
(P101) 7 - 2
Table 7-B: Troubleshooting Table, Ribbon Cable
Connector Backplane to BCC1 (P601-1, P706) 7 - 2
Table 7-C: Troubleshooting Table, Ribbon Cable
Connector BCC1 to LVD/Fuse Board (P708, P502) 7 - 2
Table 7-D: Troubleshooting Table, LVD/Fuse Board 7 - 2

Lucent Technologies Lineage®2000 ECS-12 Controller J85501D-2
Issue 3 August 1998 Introduction 1 - 1
1 Introduction
General
Information This product manual (Select Code 167-790-033) describes the
J85501D-2 ECS-12 Controller. The basic ECS-12 controller
monitors and controls up to twelve Lucent Technologies
switchmode (SR) rectifiers for systems such as the Lineage®
2000 ECS Battery Plants and provides a single interface point
for power alarm and status reporting. When ordered with the
optional microprocessor and datalogger features, it adds the
latest technology in the product line to the battery plant.
The Evolutionary Control System (ECS) demonstrates Lucent
Technologies’ continuing dedication to providing
state-of-the-art energy systems management products. The
Lineage®2000 ECS Battery Plant product line is designed to
provide battery-backed common system office voltages of
+24Vdc, -24Vdc, or -48Vdc in telecommunications
applications.
The ECS-12 controller is shown in Figure 1-1. A view of a
typical ECS battery plant is shown in Figure 1-2.
Figure 1-1: ECS-12 Controller
Lucent

Lucent Technologies Lineage®2000 ECS-12 Controller J85501D-2
1 - 2 Introduction Issue 3 August 1998
Figure 1-2: Typical ECS Controller Application
ECS Controller
POS 12 POS 11 POS 10
POS 1
POS 4
POS 7POS 8POS 9
POS 5POS 6
POS 2POS 3
LVD/R
FAIL
OPEN
Lucent
LINEAGE 2000
ECS
FOR ESD WRIST S TRAP

Lucent Technologies Lineage®2000 ECS-12 Controller J85501D-2
Issue 3 August 1998 Introduction 1 - 3
Customer
Training Lucent Technologies offers customer training on many Power
Systems products. For information call 1-972-284-2163. This
numberisansweredfrom8:00a.m. until4:30p.m.,Central Time
Zone (Zone 6), Monday through Friday.
Customer
Service Forcustomers in the United States,Canada, Puerto Rico, andthe
US Virgin Islands, call 1-800-THE-1PWR (1-800-843-1797).
Services provided through this contact include initiating the
spare parts procurement process for out of service emergencies,
ordering Lucent Technologies documents, and providing other
product and service information.
For other customers worldwide, call 001-972-840-0382. This
numberisansweredfrom8:00a.m. until4:30p.m.,Central Time
Zone (Zone 6), Monday through Friday.
Technical
Support Technical support for Lucent Technologies customers is
available around the world during the normal product warranty
period and also while specific contractual agreements extend
this service.
For customersin the UnitedStates,Canada, Puerto Rico, andthe
US Virgin Islands, call 1-800-CAL-RTAC (1-800-225-7822) to
contact a product specialist to answer your technical questions
and assist in troubleshooting problems.
For other customers worldwide, contact your local field support
center or your sales representative to discuss your specific needs.
Product Repair
and Return Repair and return service is provided for Lucent Technologies
customers around the world. For customers in the United States,
Canada, Puerto Rico, and the US Virgin Islands, call
1-800-255-1402 for information on returning of products for
repair.
For other customers worldwide, contact your sales
representative to discuss your particular circumstances.
Warranty
Service For warranty service worldwide, contact your Warranty Service
Manager (WSM). The WSM serves specific customer-groups,
who have taken ownership of the product. For product

Lucent Technologies Lineage®2000 ECS-12 Controller J85501D-2
1 - 4 Introduction Issue 3 August 1998
conformance issues prior to customer ownership, contact your
local customer service.

Lucent Technologies Lineage®2000 ECS-12 Controller J85501D-2
Issue 3 August 1998 Product Description 2 - 1
2 Product Description
Overview The ECS-12 controller consists of a chassis equipped with a
rectifier multiplexing circuit pack (BCC1)and a standardanalog
control unit, 113B, which consists of two circuit packs: the
control board (CP1) and the display board (CP4). The control
unit is plugged into a backplane with expansion slots for two
optional circuit packs: the Microprocessor Board (CP2) and the
Datalogger Board (CP3). The LVD/Fuse Board (CP5), which is
located outside the controller, is always required to provide
fusing for thecontroller andrectifier sense leads. The LVD/Fuse
Board also provides the low voltage disconnect function, if the
plant is so equipped.
A top view of the ECS-12 is shown in Figure 2-1. Figure 2-2 is
a block diagram of the controller.
Figure 2-1: Top View of ECS-12 Controller
CP2 Microprocessor Board
(lower slot)
CP3 Datalogger Board
(upper slot)
113B Control Unit
Backplane
TB104
TB103
TB102
TB101
BCC1 Multiplexer Board
SW409
or
P401
R407

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2 - 2 Product Description Issue 3 August 1998
Figure 2-2: ECS-12 Controller Block Diagram
Sense Voltages
Plant Alarms
Power
Plant Shunt
Battery
LVD/R Control
BackplaneTo Rectifiers 1-3
To Rectifiers 4-6
To Rectifiers 7-9
To Rectifiers 10-12
Multiplexer
Board
113B
Control Unit CP2
Microprocessor
Board
Telephone Interface
Modem Interface
Local Terminal/Printer
Channel Data
Control Relay Outputs
CP3
Datalogger
Board
CP1
Control
Board
CP4
Display
Board
Misc. Alarm Inputs
Misc. Control Inputs
Alarm Outputs
CP5 LVD/Fuse Board

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Issue 3 August 1998 Product Description 2 - 3
Throughout this manual the components of the ECS-12
controller are designated by the acronyms listed below:
Acronym Description
113B Analog Control Unit
CP1 Control Board
CP2 Microprocessor Board
CP3 Datalogger Board
CP4 Display Board
CP5 LVD/Fuse Board
(located outside controller)
MUX Multiplexer Board
Figure 2-3: Detail of 113B Control Unit Display Panel
OUTPUT VOLTS
AMPS
NORM
V
+–
EQ
FLOAT BD
ACF
MNF
EQ DLA
RFA
MJF
P
SW409
VOLTS FLOAT
P401
R407
DEC
DEC
NO DEC
NO DEC

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2 - 4 Product Description Issue 3 August 1998
Basic
Controller The basic ECS-12 controller monitors and controls up to twelve
Lucent Technologies switchmode rectifiers. The basic analog
control functions of the ECS-12 are described in detail in the
paragraphs that follow.
Operating
Voltage The controller is powered by the plant dc voltage and may be
used in 24V or 48V plants. It may be powered from either
positive ground systems, e.g., -48V, or negativeground systems,
e.g., +24V. Movable jumpers located on the backplane are
positioned according to the plant voltage. The 113B may be
plugged directly into any controller with a properly configured
backplane. Each different plant voltage requires a different
LVD/Fuse Board (CP5).
Batteryless
Operation The ECS-12controllerissuitable for telecommunicationspower
plants with or without batteries. In batteryless plants, the loss of
ac power causes an immediate loss of dc power to the controller.
When ac power is restored, the ECS-12 controller, in an
unpowered state, allows the rectifiers to automatically restart.
IMPORTANT When the controller loses power, it also loses the ability to
detect alarm conditions in the plant. To prevent the danger
of unreported alarms, all Power Major and Power Minor
alarms are automatically issued when the controller is
powered down.
Rectifier Sense
Leads Separately fused sense leads run from the external LVD/Fuse
Board to the rectifiers via the rectifier multiplexer board
(BCC1). These leads are not interrupted when the 113B is
removed. The rectifiers use the sense leads to maintain the plant
bus voltage independently of any load-dependent voltage drop
between their output terminals and the bus.
Office Alarm
Contacts and
Alarm Battery
Supply
Alarm contacts are provided on the 113B that may be connected
to the office alarm system by the installer. (See Section 4,
“Wiring.”) Each set of contacts is a Form C or transfer type, i.e.,
a combination of normally open and normally closed contacts
with one side of each in common. The normally open contact is
referred to as O (other applications may call this the NO
contact), the normally closed contact is referred to as C (other
applications may call this the NC contact). The common or
return contact is referred to as R (other applications maycall this

Lucent Technologies Lineage®2000 ECS-12 Controller J85501D-2
Issue 3 August 1998 Product Description 2 - 5
the C contact). Each Form C set is isolated. An alarm set is
provided for each type of alarm condition, as follows:
AC Failure (ACF)
Major Fuse Failure (MJF)
Minor Fuse Failure (MNF)
High Voltage (HV)
Battery on Discharge (BD)
Low Voltage Battery Disconnect (LV)
In addition, alarms that are classified as Major or Minor cause a
group of general-purpose Major or Minor alarms, as follows:
Power Major - Visible (PMJV)
Power Major - Audible (PMJA)
Power Major - External (PMJE)
Power Minor - Visible (PMNV)
Power Minor - Audible (PMNA)
Power Minor - External (PMNE)
The alarm state of a relay is the “normal” state, i.e., when an
alarm condition exists, a closure exists between the “C” and “R”
poles and an open exists between the “O” and “R” poles.
Each set of contacts can be in the non-alarm state only when the
control unit is powered and the corresponding alarm is not
present. When an alarm occurs or when the control unit loses
power, each closed pair of contacts opens and each open pair of
contacts closes.
An Alarm Battery Supply (ABS) and a ground return are
available on oneof 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. The ABS is the same voltage as the plant
bus voltage and is separately fused on the external LVD/Fuse
Board.
Battery on
Discharge Alarm If rectifier output isinsufficientto supply the load current forany 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
onthe controller front panel.This alarmthresholdis typically set

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2 - 6 Product Description Issue 3 August 1998
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 theBDalarm 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.
The actual BD threshold settings that may be selected are listed
on Figure 4-3 and on a label on the controller itself. Therange of
available settings is based on the most common battery float
voltages for 24V and 48V systems.
Selective High
Voltage
Shutdown
The controller is equipped to detect a high voltage condition on
the plant bus. Such a high voltage condition is typically caused
by lightning-induced transients on the commercial ac power
lines. A rectifier failure might, however, cause an individual
rectifier to increase its output voltage. To prevent high voltage
from damaging the connected telecommunications load, the
controller will shut down rectifiers that deliver high voltage
power.
When the controller detects an increase in the plant voltage
above a preset threshold, it immediately issues an HV alarm to
the external alarm system. HV is considered a Major alarm, so
all Power Major alarm groups are also issued.
When reporting the alarm, the controller sends a simultaneous
shutdownsignaltoallrectifiers.Since theoutputsofallrectifiers
are paralleled in the plant, their output voltages are forced to be
the same. Their output currents, however, may vary widely. In a
high voltage condition caused by an individual rectifier failure,

Lucent Technologies Lineage®2000 ECS-12 Controller J85501D-2
Issue 3 August 1998 Product Description 2 - 7
the failed rectifier will be supplying more current than any other
rectifier. When the high voltage shutdown signal is sent by the
controller, the rectifiersupplying the most current, i.e., the failed
rectifier, will shut down, causing the plant voltage to drop to
normal and the HV alarm to retire. All other rectifiers will
remain on. If a high voltage condition exists without an
individual rectifier failure, e.g., because of incorrect setting of
the HV-threshold DIP switches or lightning-induced high
voltage, the rectifier with the highest output current will shut
down, but the HV condition will remain. The rectifier with the
highest output current of those remaining on will shut down
next, but again the HV condition will remain. This will continue
until all rectifiers have shut down. Note that although it is a
sequential shutdown of rectifiers, the timing is very fast, and it
will appear as if all rectifiers have shut down simultaneously.
The detection of the high voltage condition and sending of the
shutdown signal are functions of the controller, while the
selection of the rectifier with the highest output current for
shutdown is a function of the rectifiers.
The high voltage shutdown threshold voltage should be set by
the user to a prescribed margin above the plant float voltage.
(See Section 4, “High Voltage Shutdown Thresholds.”) This
margin is typically 1.5 volts for nominal 48V battery plants and
0.75 volts for nominal 24V battery plants. Since voltage
fluctuations are greater in batteryless plants, the shutdown
margin is typically set at 3 volts above float in 48V batteryless
plants or 1.5 volts for 24V batteryless plants. The actual
threshold voltage is set with a group of DIP switches on the
113B. DIP switches provide a visual verification of the
shutdown set point at all times.
For plants configured with the float/equalize feature, a separate
high voltage shutdown threshold is used when the plant is in
equalize mode. A separate group of DIP switches are used to
select the HV shutdown threshold for equalize mode. When the
plantisswitchedfromfloattoequalize,theequalizehighvoltage
shutdown threshold becomes effective immediately. When the
plantisswitchedfrom equalize tofloat,theequalize highvoltage
shutdown threshold remains effective for 2-4 minutes, after
which the float high voltage shutdown threshold becomes
effective. This delay is necessary to avoid nuisance HV alarms
and shutdowns that would occur if the float threshold became
effective whilethe batteryvoltage was slowlydropping fromthe
equalize voltage to the float voltage. This feature is basically
transparent in normal plant operation, but could be

Lucent Technologies Lineage®2000 ECS-12 Controller J85501D-2
2 - 8 Product Description Issue 3 August 1998
misinterpreted as a failurein the HV detection circuit if not taken
into account during acceptance testing or troubleshooting.
The available threshold settings correspond with the range of
float and equalize voltages that might be encountered in nominal
24V and 48V applications. A listing of the actual settings
appears on Figure 4-3 and on a label on the controller itself.
The highvoltage alarm contacts can betested by pressing switch
SW104 (see Figure 4-2 for location). When SW104 is pressed,
the HV, PMJA, PMJE, and PMJV alarms on the office alarm
terminal blocks are activated, the NORM LED on the front panel
is extinguished, and HV is sent to the CP2 Microprocessor
Option Board if the controller is so equipped. The alarm remains
as longas the switchis held, andnormaloperationresumes when
the switch is released. This test switch does NOT send an HV
signal to therectifiers, so no rectifiers will beshut down, and the
rectifier restart signal will NOT be issued.
Automatic
Rectifier Restart A high voltage shutdown from the controller is typically followed by an automatic restart signal. When the controller
detects that one or more rectifiers have responded to its HV
signal by shutting down, there is a 3 to 5 second delay, after
which the controller issues a restart signal to all rectifiers.
Rectifiers that have shut down may or may not respond to the
restart signal, depending on the nature of the failure.
The restart signal consists of two sets of clean contact closures.
One set of closures is connected to rectifiers 1, 2, 3, 7, 8, and 9.
The other set is connected to rectifiers 4, 5, 6, 10, 11, and 12. In
this way, different types of rectifiers with restart circuits that are
otherwise incompatible may be combined (in groups of six) in
one plant. Different rectifier types may not be mixed within one
group of six rectifiers. See “Mixed Types of Rectifiers in One
Plant” in this section for further details.
After the controller issues the restart closures, they stay in effect
for the next 4 to 6 minutes and then they reopen. The controller
does not issue a new restart signal in response to any additional
high voltage events in that 4 to 6 minute period. The timeout
period is intended to prevent multiple shutdown/restart cycles
during heavy lightning storms that would otherwise stress the
power equipment.

Lucent Technologies Lineage®2000 ECS-12 Controller J85501D-2
Issue 3 August 1998 Product Description 2 - 9
Rectifiers that have not shut down are not affected by the restart
signal from the controller and continue to run normally.
Rectifiers that have restarted in response to the signal will
resume normal operation unless lightning activity continues or
they are actually faulty units. In either case, if the plant voltage
goes high again during the 4-6 minute timeout, the shutdown
signal (see previous section) will be reissued but will not be
followed by an automatic restart.
The 4-6 minute timer may be reset manually before it times out
by pressing switch SW107 (see Figure 4-2 for location). This
may be desirable during testing of the restart circuit. See also
Section 5, Acceptance Testing. The timer will also reset and a
restart will be issued if thecontroller loses power for any reason
(e.g., if controller fuses are removed).
The automatic restart function may be disabled by the user or
installer by moving a jumper strap on the basic controller. (See
Section 4, Installation and Setup, for this procedure.) This
function should be disabled only for batteryless plants equipped
with only one rectifier. In such an application, the controller
loses power if the rectifier is shut down and, in the process,
issues a restart. If the one rectifier shuts down again, the cycle
will repeat, since the controller will again lose power. To prevent
a possibly infinite cycle of shutdown and restart, the automatic
restart function should be disabled for batteryless plants with
only one rectifier.
Rectifier Fail
Alarm There are various types of failure conditions in different types of rectifiers that result in a rectifier failure signal. Refer to the
appropriate rectifier manuals for details. Whenever a rectifier
fail signal is received by the controller from any rectifier, the
controller issues a rectifier fail alarm (RFA) to the office alarm
system. A yellow LED on the controller front panel also lights.
The loss of one or more rectifiers is not necessarily an
emergency unless the plant voltage drops and the batteries begin
to discharge. Rectifier Fail is treated as a Minor alarm by the
controller, which issues all three sets of Power Minor office
alarms in addition to the separate RFA alarm. If loss of rectifier
output causes the plant voltage to drop significantly, a BD alarm
is issued, which is a Major alarm condition.
If a failed rectifier is successfully restarted, either manually or
automatically,or if it disconnected from the controller interface,