Exciter Acronyms

Exciter Acronyms
Application Control Layer Module The IS215ACLE Application Control Layer (ACLE) module is a microprocessor based
master controller that performs multiple duties over communication networks
such as Ethernet.
Analog Common
Control Common
Current Tranfsormer
Digital Common
Digital Signal Processor Board
Exciter AC Feedback Board level The IS200EACF Exciter Ac Feedback board (EACF) measures the exciter PPT ac
supply voltage and current in the EX2100 Excitation Control. The terminal board
contains transformers for a three-phase voltage measurement, and terminals for two
Flux/Air core coils. The outputs of the voltage and current circuits are fanned out to
three DB9 connectors for cables to controllers M1, M2, and C.
Exciter Backplane Board The IS200EBKP Exciter Back Plane (EBKP) is used in the EX2100 Excitation
Control. It is part of the control module and provides the backplane for the control
boards, and the connectors for the I/O terminal board cables. EBKP has three
sections for the controllers M1, M2, and C. Each section has its own independent
power supply. Sections M1 and M2 both have the ACLA or ACLE, DSPX, EISB,
EMIO, and ESEL boards. Section C has the DSPX, EISB, and EMIO. The EBKP
board is mounted in a rack holding the control boards, with two cooling fans at the
Exciter Contact Terminal Board The IS200ECTB terminal board supports excitation contact outputs and inputs in the
EX2100 Excitation Control. There are two versions; the ECTBG1 board is only
used in the redundant control, and the ECTBG2 board is only used in the simplex
control. Each board contains two trip outputs driving a customer lockout, controlled
by the EMIO board. There are also four general purpose Form-C contact outputs
controlled by the EMIO board.
Exciter DC Feedback Board The IS200EDCFG1A Exciter Dc Feedback Board (EDCF) is used in the EX2100
Excitation Control. It measures field current and field voltage at the SCR bridge, and
interfaces to the EISB board in the control panel over a high-speed fiber-optic link.
Exciter De-excitation Board The IS200EDEX Exciter De-Excitation control board (EDEX) is the main board in
the de-excitation module. This module removes stored energy from the generator
field when an emergency shutdown occurs and the field breaker or contactors open.
EDEX provides SCR firing, conduction sense feedback, and voltage retention to
ensure operation in the event of a power failure.
Exciter Ground Detector Module
Exciter Gate Pulse Amplifier Board The IS200EGPA Gate Pulse Amplifier Board (EGPA) is used in the EX2100
Excitation Control. It takes the gate commands from the ESEL and controls the gate
firing of up to six SCRs (Silicon Controlled Rectifiers) on the Power Bridge. It is
also the interface for current conduction feedback, and bridge airflow and
temperature monitoring.
Exciter Fan Control Board
Exciter Gate Pulse Amplifier Board - see EGPA
Exciter IS Bus Board The IS200EISB Exciter ISBus Board (EISB) is a special communication board for
the M1, M2, and C controllers. It receives and transmits fiber-optic feedback signals
and transmits them over the control backplane to the DSPX controller and also
communicates between the DSPX and the tool and keypad ports using RS-232C
through the backbone connector.
Exciter Current Sensor
Exciter Main IO Board EMIO handles the I/O from the EPCT, ECTB, EACF,
and EXTB terminal boards. The I/O includes PT and CT signals. Contact inputs,
output relay drivers, and pilot trip relay drives. It also sends logic level gate pulse
signals over the backplane to the ESEL board, which sends them to EGPA in the
power conversion cabinet.
Exciter Power Backplane The IS200EPBP power backplane holds three independent power supplies (EPSM)
that supply power to the M1, M2, and C controllers. It also holds three ground
detection modules (EGDM). EPBP accepts 125 V dc from the adjacent Exciter
Power Distribution Module (EPDM), and distributes logic level power from the three
power supply modules to the three controllers. Each power supply has an
independent ON-OFF switch on the EPDM.
Exciter PT/CT Board
Exciter Power Distribution Module
Exciter Power Supply Module
Exciter Regulator Options Board The IS200EROCH_A Exciter Regulator Options Card (EROC) is used in EX2100
regulator control systems (simplex and redundant) to provide support for the
regulator functions.
Exciter Simplex Backplane
Exciter Selector Board The IS200ESEL Exciter Selector Board (ESEL) mounts in the control rack and
receives six logic level gate pulse signals from its corresponding master I/O (EMIO)
board. It then uses the pulse signals to drive six sets of cables which are distributed
to the exciter gate pulse amplifier (EGPA) boards.
Exciter Attenuation Module The Exciter Attenuation Module (EXAM), combined with the Exciter Ground Detector Module (EGDM), provides the ground detection system for the EX2100 Excitation Control. It provides attenuation between the field bus and the EGDM by sensing high voltage from the bridge and scaling the voltage to a usable level.
Exciter High-Speed Relay Driver Board The IS200EXHS Exciter High-Speed Relay Driver (EXHS) board is used in the EX2100 Excitation Control and provides drivers for the dc contactors (41), and pilot relays for de-excitation and field flashing.
Human Machine Interface
Primary Controller
Backup Controller
Power Conversion Module
Power Current Transformer
Permanent Magnet Generator
Peak Reverse Voltage Sharing Resistors
Resistance Temperature Device
Silicon Controlled Rectifier (Thyristor)
Shaft Voltage Suppressor
Under Excitation Limit
Warm Backup
Exciter Regulator Interface and Dynamic Discharge board (ERDD) The ERDD provides the following major functions:
• Gate drive control for field excitation
• Dynamic discharge to control excessive dc link voltage
• Bridge feedback to monitor dc link voltage, output shunt current, output field voltage, bridge temperature, and IGBT gate drive status (power supplies and desaturation conditions)
• Control of the de-excitation relay (K41) in simplex applications or control of the charging relay (K3) in redundant applications
Exciter Regulator Third-party Ground Detector Terminal Board
Exciter Regulator Static Converter
Excitation Control Dc Fanned Feedback The EDFF scales and converts field current and field voltage at the exciter or regulator output into frequency feedback signals. The signals are optically linked to the EAUX or ERAX boards using plastic fiber-optic cable (POF). The EDFF consists of voltage-to-frequency (V-F) converter circuits: one for field current feedback and one for field voltage feedback, for up to three redundant control sections, referred to as M1, M2, and C.
Excitation Control Regulator Auxiliary I/O The ERAX board contains the following functions:
• PCM transistor (IGBT) gate drive control for field excitation
• Dynamic Discharge to control dc link overvoltage
• PCM feedbacks to monitor the following:
− Dc link voltage including overvoltage detection
− Output shunt current including over-current detection
− PCM output voltage
− PCM heatsink temperature
− IGBT gate drive status and de-saturation protection
• Control of the K41 dc output contactor and the K3 dc link charging relay
• Field ground detector interfaces with the EXAM attenuator or the ERGT terminal
board to provide:
− 50 V square wave signal to EXAM for ground detection
− Conditioning of ground detection feedback signals from EXAM
− Ground detector test functions on EXAM
− Around detector test functions on EXAM
• Generator field voltage and field current feedbacks via fiber optic cables from EDFF
• Dc/dc conversion and isolation of 28 V dc power input as required to support the
above functions
• 86G hardware and software lockout function
• Interface for the dual control selector board, EDSL, for redundant applications
Excitation Control System I/O Interface The ESYS interfaces basic I/O external to the exciter (customer I/O) with the EX2100e control system.
Excitation Control Bridge Ac Feedback The EX2100e Excitation Control Bridge Ac Feedback (EBAC) board provides the EX2100e Excitation control with transformer-isolated instrumentation of the three-phase ac source voltage to the power converter voltage to the silicon controlled rectifier (SCR)/thyristor. This allows the control to synchronize gating of the SCRs to the incoming ac line.
Excitation Control Bridge Interface The EX2100e Excitation Control Bridge Interface (EBRG) board interfaces the EX2100e control system to the silicon controlled rectifier (SCR) or thyristor bridge gates and related bridge I/O including fan starters, fan status feedback, over temperature and blown fuse detectors, RTD temperature sensors, and Rogowski coil bridge line current sensors.
Excitation Control Control Power Distribution The EX2100e Excitation Control Power Distribution (EDIS) interfaces customer ac and dc control power sources to the EX2100e control power supplies and to the control system hardware.
Excitation Control Auxiliary Interface The EX2100e Excitation Control Auxiliary I/O (EAUX) board uses a high-speed serial
link (HSSL) to interface the UCSB controller to the following functions and modules:
• One or two 41DC contactors or breakers, including coil drivers and aux contact feedbacks
• Field flashing module, including 53A and 53B flashing contactor drivers, and aux contact feedbacks
• An 86G customer lockout input, including a controller-independent permissive to the 41DC contactor
• Redundant firing enable controls to the de-excitation module
• Conduction status feedbacks from the de-excitation and crowbar modules
• Redundant field ground detector function and interface to the EX2100e Ground Detector Attenuator Module (EXAM) attenuator board
• Field voltage and field current feedbacks, received through fiber-optic interfaces to the EX2100e dc Fanned Feedback (EDFF) board
• Control power supply monitor inputs
• Instrumentation of the power potential transformer (PPT) secondary voltage inputs to the power converter, through the EBAC board
• Triple modular redundant (TMR) interface with the M1, M2, and C controllers (UCSB) through the HSLA high-speed serial link interface board
The High-speed Serial Link Interface (HSLA) board is a single or dual-port high-speed serial link (HSSL) target board. The HSSL is a high-speed point-to-point communication link between a HSSL controller and target, or two HSSL controllers.