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General Electric DS200TCTGG1A Simplex Trip Board Item NO.: 2907235

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Product Name	General Electric DS200TCTGG1A Simplex Trip Board
Item NO.	2907235
Weight	0.1 kg = 0.2205 lb = 3.5274 oz
Category	GE
Brand	GE
Creation Time	2026-09-10

General Electric

DS200TCTGG1A

Simplex Trip Board

Mark V Speedtronic

Turbine Protection · Relay Output · 2oo3 Voting

Product Overview

The DS200TCTGG1A is a Simplex Trip Board (TCTG) from GE's Speedtronic Mark V turbine control system. It is located in position 4 of the core and controls the fuel shutoff halves for the turbine.

The board houses both Primary Trip Relays (PTRs) and Emergency Trip Relays (ETRs) for failsafe fuel valve operation. The PTRs are controlled by the CSP and communication errors, while the ETRs are managed by the TCEA boards in the core with a 2-out-of-3 voting requirement for emergency trips.

Hardwired trip pushbuttons can directly de-energize the 24 V DC power to both the PTR and ETR relays, achieving independent hardware-level tripping that does not rely on software logic. The board also houses synchronizing relays for generator breaker close control.

Technical Specifications

Parameter	Value
Brand	General Electric (GE)
Model	DS200TCTGG1A
Type	Simplex Trip Board / Turbine Trip Board (TCTG)
Country	United States
Series	Speedtronic Mark V
Board Location	Position 4 in Mark V control core
Relay Types	Primary Trip Relays (PTR), Emergency Trip Relays (ETR), Synchronizing Relays
Relay Quantity	21 electromechanical plug-in relays (K1–K25 range)
Connectors	3x 50-pin (JLX, JLY, JLZ), 2x 12-pin (JN, JM)
Hardware Jumper	J1 — Emergency Overspeed Servo Clamp Enable
Software Configuration	None (all functions hardware-defined)
Protection Bus	24 V DC
Relay Contact Rating	10 A at 250 V AC / 30 V DC

Trip Functionality & Protection

How the DS200TCTGG1A Executes Turbine Protection

The DS200TCTGG1A handles the final, critical steps in the turbine’s protection sequence. It houses the electromechanical relays necessary to execute a trip and provides the signals that open/close the electrical circuits to the hydraulic trip block.

Primary Trip Relays (PTRs) triggered by CSP and communication faults
Emergency Trip Relays (ETRs) triggered by TCEA boards with 2oo3 hardware voting
Hardwired trip pushbuttons de-energize 24 V DC to PTR and ETR relays

Generator breaker close circuit via synchronizing relays
Emergency Overspeed Servo Clamp Enable via J1 jumper (relay on TCQC board)
Fuel shutoff control to hydraulic trip block for fuel/steam stop valves

Connectors & Signal Routing

DS200TCTGG1A Interface Points

The DS200TCTGG1A uses multiple high-density connectors for communication with core processors and terminal boards. The board contains no software configuration; all functions are implemented through hardware logic.

J7W — 125 V DC power distribution from TCPD board
JDR — PTR signals from TCQA (relays K10, K13, K16, K19); daisy-chained with JDS and JDT
JDS — PTR signals from TCQA (relays K11, K14, K17, K20)

JDT — PTR signals from TCQA (relays K12, K15, K18, K21)
JLX/JLY/JLZ — ETR trip signals from P1 core X/Y/Z channels
JN/JM — PTBA terminal board signals (breaker close, hardwire trip, emergency trip)

FAQ

Our DS200TCTGG1A failed and we need a replacement fast. How do we confirm the new board matches the original trip logic?

The DS200TCTGG1A has no software configuration — all trip logic is hardware-defined. Before installing the replacement, verify that the G1A revision and the relay layout match your original board. Check all 50-pin (JLX, JLY, JLZ) and 12-pin (JN, JM) connectors are fully seated and free of oxidation.

The DS200TCTGG1A is showing a trip condition but we cannot identify which relay triggered. How do we isolate the fault?

The DS200TCTGG1A uses hardware-level 2oo3 voting for ETR functions. Check the TCEA boards in the P1 core for X, Y, and Z channel trip signals via JLX, JLY, and JLZ connectors. If two out of three channels call for a trip, the ETR relays will actuate regardless of the third channel.

Can we test the DS200TCTGG1A trip relays without shutting down the turbine?

The DS200TCTGG1A houses PTR, ETR, and synchronizing relays that directly control fuel shutoff. Testing these relays while the turbine is running would initiate a trip. Schedule relay testing during planned outages and use the Mark V HMI to verify relay status before returning the unit to service.

Our DS200TCTGG1A has been in service for years. How do we know if the trip relays are still within specification?

The DS200TCTGG1A relay contacts are rated for 10 A at 250 V AC / 30 V DC. Over time, relay contacts can oxidize or pit. During scheduled maintenance, inspect the gold edge connector for oxidation and clean it with isopropyl alcohol and a lint-free cloth. If relay timing drifts, replace the board rather than attempting field relay replacement.

What is the function of the J1 jumper on the DS200TCTGG1A?

J1 is the Emergency Overspeed Servo Clamp Enable jumper. When activated, it applies 24 V DC to the servo outputs for servovalves one through four, providing emergency overspeed servo clamp control. The actual relay for this function is located on the TCQC board.

Moore Automation

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

With a global sourcing network, we locate discontinued Mark V boards and related components, verifying part numbers and revisions before shipment. Our process is built for the reality of turbine outages — fast quotes, clear condition reports, and shipping that meets your maintenance window.

Supported Brands

GE Bently Nevada Woodward ABB Emerson Triconex Honeywell Siemens

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