The GE IS200ESELH2A Exciter Selector Board acts as the central selection and monitoring hub for
redundant excitation control channels in GE’s EX2100 excitation system, designed to ensure
seamless (switching) between primary, secondary, and backup regulators while maintaining
excitation system stability. Its core function is to manage channel selection—supporting both
automatic failover and manual operator-initiated —by evaluating key health signals (e.g.,
regulator output consistency, EISB communication status, power supply integrity) from redundant
DSPX controllers. When an anomaly is detected in the active channel (e.g., loss of field current
feedback, overexcitation fault), the board triggers an automatic to the standby channel within
<10ms, fast enough to avoid generator terminal voltage fluctuations or trips. It also provides manual
controls via front-panel switches or remote commands from the EX2100 HMI, enabling
maintenance without system downtime. Additionally, the board monitors critical system parameters
(e.g., selector switch position, channel fault status) and transmits real-time diagnostic data to the
EX2100’s main controller via the EISB bus, with front-panel LED indicators for at-a-glance status
checks (e.g., green = active channel, yellow = standby, red = fault). Built with ruggedized components
and an IPC-CC-830B Class 3 conformal coating, it operates reliably in harsh industrial environments
(e.g., power plant vibration, temperature swings) and supports hot-swapping in redundant racks to
maximize system availability.
Key Functional Features
Rapid Fault Response: Executes shutdown sequences in <100 ms (typical) for critical faults (e.g., loss of excitation)—minimizes time turbomachinery operates in unsafe conditions (e.g., overspeed due to lost excitation).
Configurable Safety Logic: Via GE ToolboxST, users can customize fault thresholds, delay times, and output actions to match specific turbomachinery models (e.g., GE 7F gas turbine vs. steam turbine) and site safety requirements.
Comprehensive Diagnostics:
Self-Monitoring: Continuously checks internal circuits, power supply, and input/output connections—alerts the Mark VI/VIe system to module faults (e.g., open input wires, output short circuits) via diagnostic codes.
Event Logging: Records shutdown triggers (timestamp, fault type, pre-fault parameter values) for post-incident analysis—aids in root-cause identification (e.g., distinguishing between genuine overexcitation and sensor errors).
Redundancy Support: Configurable in 1+1 redundant pairs for high-availability applications (e.g., base-load power plants). Redundant modules synchronize data in real time, ensuring seamless failover if the primary module malfunctions (no interruption to protection logic).
GE Ecosystem Synergy: Tightly integrated with GE’s Mark VI/VIe HMI and PlantPAx DCS—enables operators to monitor excitation system status, view shutdown history, and test safety logic (via "force test" mode) without disrupting operations.
Technical Specifications
| Parameter Category | Details |
| Core Function | Redundant channel selection (primary/secondary/backup) for EX2100 regulators; automatic failover; manual ；fault monitoring; diagnostic data transmission. |
| Mechanical Specifications | - Form Factor: Single-slot 3U Eurocard (compatible with EX2100 standard racks)- Dimensions: 100mm (W) × 150mm (H) × 25mm (D)- Material: FR4 PCB with IPC-CC-830B Class 3 conformal coating; aluminum front panel- Mounting: Screw-fixed to EX2100 rack (torque requirement: 2.5 Nm) |
| Channel Support | - Redundant Channels: Up to 3 (primary, secondary, backup)- Logic: Automatic (fault-triggered) + manual (front-panel/HMI-initiated)- Latency: <10ms (automatic failover); <50ms (manual ) |
| Input/Output Signals | - Inputs: 6 discrete status signals (regulator health, power supply OK); 2 analog signals (field voltage feedback)- Outputs: 3 discrete control signals (channel enable); 1 analog signal (selected channel status)- Signal Level: Discrete (24V DC, sinking); Analog (0–10V DC) |
| Communication Interface | - Protocol: EISB (Exciter Internal Serial Bus)- Data Rate: 10 Mbps (full-duplex)- Transmitted Data: Channel status, fault codes, 切换 history, diagnostic metrics |
| Environmental Ratings | - Operating Temperature: -40°C to 70°C (-40°F to 158°F)- Storage Temperature: -55°C to 85°C (-67°F to 185°F)- Relative Humidity: 5%–95% (non-condensing)- Vibration Resistance: IEC 60068-2-6 (5g, 10–500Hz)- Shock Resistance: IEC 60068-2-27 (50g, 11ms) |
| Power Requirements | - Supply Voltage: 24V DC ±10% (from EX2100 backplane)- Power Consumption: <5W (typical); <8W (max) |
| Safety & Compliance | - Certifications: UL 61010-1, IEC 61800-5-1, CE- Isolation: 2.5kV AC (field signals to logic circuits)- Fault Protection: Overvoltage protection (36V DC max); reverse polarity protection |
| Indicators & Controls | - LEDs: 3 channel status LEDs (green = active, yellow = standby, red = fault); 1 power LED (green); 1 EISB communication LED (green)- Controls: 1 manual switch (3-position: Primary/Secondary/Backup); 1 fault reset button |
| Compatibility | - System: Exclusive to GE EX2100 excitation control system- Compatible Regulators: IS200DSPX (primary/secondary), IS200DSPX-B (backup)- Backplane: IS200ERBPG1A/1B (EX2100 standard backplanes) |
Our service
