IS200VTURH1ADE: An Early-Revision Mark VI VME Turbine Card

The IS200VTURH1ADE is the H1A build of GE's VME turbine (VTUR) primary protection card for the Speedtronic Mark VI, offered here as new-surplus factory-packaged stock. This is the board that measures turbine speed, produces the primary overspeed trip, keeps watch on induced shaft voltage and current, and, on gas turbines, monitors the flame detectors. As an H1A revision it is often the exact match older Mark VI lineups were commissioned with, which matters because turbine protection cards can be revision-sensitive.

The role of the primary protection card

VTUR is the primary protective element for turbine speed in a Mark VI. It reads up to four passive magnetic pickups over roughly 2 Hz to 20,000 Hz, uses the median speed for both control and the primary overspeed trip, and resolves very low rotation so the control can detect zero speed and manage turning gear. On a trip it drives three primary overspeed relays on a TRPx terminal board (TRPG on gas machines, TRPS or TRPL on steam), which act on the emergency trip devices. Within a TMR system a VTUR runs in each of the <R>, <S>, and <T> cores under voting; simplex systems use one. Independent emergency overspeed protection is provided separately by the VPRO card in the <P> protection core, so the two paths should never be confused during fault-finding.

Troubleshooting a VTUR complaint the right way

The card is safety-critical and not cheap, so it pays to prove the fault before replacing it. These symptoms usually trace to something other than the VTUR:

• Speed signal lost or unstable: examine the magnetic pickup and its gap, the field wiring to TTUR, and the JR5 speed cable. In a TMR set, one bad channel is voted out and does not by itself mean the card has failed.
• Overspeed trip fired unexpectedly, or a trip test did not complete: investigate the TRPx and TREx trip boards, the trip-solenoid wiring, and the trip power feed before the card.
• Flame-detector alarms on gas turbines: check the Geiger-Mueller detector and its external supply routed through TRPG, since fouling or a supply fault mimics a card issue.
• Automatic synchronizing or 52G breaker problems: the PT inputs and breaker relays sit on TTUR, so the fault is usually there, not on the VTUR.
• Card unrecognized by the controller: reseat it and verify backplane power and firmware revision compatibility.

The HMI fault log will normally show which element latched, which is the quickest way to keep a healthy card in service.

What IS200VTURH1A and the DE suffix indicate

The number reads as IS200 (Mark VI IS200 board series), VTUR (VME turbine primary-protection function), H1 (hardware group), A (functional revision), and DE (artwork and coating revision). The H1A, H1B, and H2B builds are revisions of the same VTUR function; where a system was set up for a specific revision, match it rather than assuming any VTUR will serve. See our GE Speedtronic Part Number Decoder for a full breakdown of the string.

Companion Mark VI protection hardware

Consider the VTUR together with the boards it depends on: the TTUR input terminal board that lands the pickups, shaft, PT and breaker wiring (via JR5 and JR1), the TRPx/TREx trip boards, and the independent VPRO emergency protection card. These are listed in the GE Mark VI IS200 Boards collection and the wider GE Speedtronic Turbine Control Boards catalog. GE documents VTUR operation in the Mark VI System Guide, GEH-6421; for platform history, our Mark V vs Mark VI: DS200 to IS200 guide is a useful companion.

Details that help us quote

• The full part number and suffix on the label (IS200VTURH1ADE) plus any other revision codes
• A photo of the board label
• Turbine model and Mark VI generation
• Simplex or TMR, and the affected core if known
• Quantity and urgency

Request a quote

This IS200VTURH1ADE is supplied new-surplus, factory-packaged, and backed by the warranty shown below. Click Request a Quote for a response within 24 hours. We ship worldwide DDP and accept purchase orders from qualified organizations. Since this early-revision protection card must match your system, include your turbine model and timeline and we will confirm suitability and lead time.