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General Electric IS200ESELH2A Exciter Selector Board Item NO.: 2907252

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Product Name	General Electric IS200ESELH2A Exciter Selector Board
Item NO.	2907252
Weight	0.1 kg = 0.2205 lb = 3.5274 oz
Category	GE
Brand	GE
Creation Time	2026-09-11

General Electric

IS200ESELH2A

Exciter Selector Board

EX2100 / Mark VI

Multi-Bridge Pulse Routing · 3 Bridge Drivers · TMR Arbitration

Product Overview

The IS200ESELH2A is an Exciter Selector Board (ESEL) from GE's EX2100 static excitation system. It functions as the central pulse-routing hub for multi-bridge power converter configurations.

The H2 model is engineered to synchronize and manage gate trigger commands for up to three parallel Power Conversion Modules (PCMs). It receives six logic-level gate pulse signals from its associated EMIO board and replicates them to three separate output channels, ensuring identical firing angles across all parallel bridges .

In redundant configurations, two IS200ESELH2A boards operate in parallel (one driven by M1, one by M2), with controller C determining the active master. The standby board has all outputs blocked, guaranteeing only one controller commands the multi-bridge array at any time.

Technical Specifications

Parameter	Value
Brand	General Electric (GE)
Model	IS200ESELH2A
Type	Exciter Selector Board (ESEL)
Country	United States
Series	EX2100 / Mark VI Excitation Control
ESEL Group	H2
Bridge Drivers	3
Power Conversion Modules	Up to 3 PCMs
Gate-Pulse Outputs	6 signal cable sets
Input Signal	Logic-level gate-pulse signals from EMIO
Output Interface	EGPA boards
Redundant Operation	Supported (two ESEL boards, M1 + M2)
Connectors	P1, P2
Front LEDs	Power / Session / Gating status
Failover Time	< 10 ms automatic switch
Power Draw	< 5 W typical, < 8 W max
Operating Temperature	-40°C to +70°C
Humidity	5% – 95% non-condensing
Isolation	2.5 kV AC field-to-logic
Communication	EISB exciter internal serial bus

Multi-Bridge Gate Pulse Distribution

How the IS200ESELH2A Routes Firing Commands

The IS200ESELH2A receives a single set of six logic-level gate pulse signals from its associated EMIO board, representing the firing commands for a conceptual three-phase bridge. It then replicates and routes this single set of six pulses to output channels for up to three separate PCMs.

Centralized command reception from EMIO board
Intelligent signal fan-out to 3 independent PCM channels
Identical firing angles across all parallel bridges
Critical for current sharing and preventing circulating currents

Buffer and driver circuitry replicates input stream to 3 isolated outputs
Each output feeds a separate EGPA board
EGPA boards drive their specific Power Conversion Module
All 3 PCMs receive identical firing commands simultaneously

Redundant Control Arbitration

IS200ESELH2A System-Level Arbitration and Failover

In Triple Modular Redundant (TMR) systems, the IS200ESELH2A performs critical arbitration for the entire set of bridges under its control. Two ESEL boards operate in parallel, with controller C determining the active master.

Two ESELH2A boards (M1 + M2) operate in parallel
Controller C determines active master
M1 always drives ESEL 1; M2 always drives ESEL 2
M1 is the default controller

Active ESEL enables output suite to all 3 assigned PCMs
Standby ESEL has all outputs blocked
Failover time < 10 ms automatic switch
Reliable fanout: if one fanout circuit fails, others unaffected

FAQ

Our IS200ESELH2A is not routing gate pulses to one of the EGPA boards. How do we isolate which bridge channel failed?

The IS200ESELH2A provides three independent output channels for up to three PCMs. Check the front-panel Gating LED to confirm the board is actively driving outputs. Then verify the cable harness between the specific EGPA board and the corresponding ESELH2A output channel. The board uses independent fanout circuits, so a failure in one output path should not affect the other two.

We need to replace an IS200ESELH2A in a redundant EX2100 system. Can we install a single board and run simplex temporarily?

Yes, but with caveats. The IS200ESELH2A supports simplex operation with one board. In redundant configurations, M1 drives ESEL 1 and M2 drives ESEL 2, with controller C selecting the active master. Running simplex means you lose the automatic failover capability. Ensure the replacement board has the correct H2 revision with three bridge drivers before installation .

The IS200ESELH2A front-panel LEDs show Power and Session active but Gating is off. What does this indicate?

The three front-panel LEDs indicate: Power (board has power), Session (enabled by signal from control C), and Gating (driven by gate inputs from EMIO). If Power and Session are on but Gating is off, the EMIO board is not sending gate pulse signals to the ESELH2A. Check the EMIO board output and the cable connection between EMIO and ESELH2A.

Can we use an IS200ESELH1A as a drop-in replacement for an IS200ESELH2A?

No. The ESEL family is divided by bridge-driver capacity: ESELH1 has 1 bridge driver (one PCM), ESELH2 has 3 bridge drivers (three PCMs), and ESELH3 has 6 bridge drivers (six PCMs) . Using an H1 in place of an H2 would limit you to one PCM instead of three. Always match the ESEL version to your bridge configuration.

Our IS200ESELH2A is several years old and we are concerned about reliability. What should we check before a planned outage?

The IS200ESELH2A is an obsolete board no longer produced by GE, so replacement availability is limited . Before a planned outage, verify the board’s LEDs are all functional (Power, Session, Gating), inspect the P1/P2 backplane connectors for oxidation, and confirm cable harness connections to all EGPA boards are secure. If the board shows intermittent gating faults, source a replacement with matching H2 revision before the outage window.

Moore Automation

Moore Automation supports power generation and heavy industry with a focus on legacy excitation control components. Our team helps plants maintain GE EX2100 and Mark VI excitation systems when OEM support windows close and replacement parts become scarce.

With a global sourcing network, we locate discontinued exciter selector boards and related components, verifying revision levels and bridge-driver configuration before shipment. Our process is built for the reality of forced outages — fast quotes, clear condition reports, and shipping that meets your maintenance window.

Condition reports with detailed photos for critical excitation modules

Supported Brands

GE Bently Nevada Woodward ABB Emerson Triconex Honeywell Siemens

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