Where IS200VTCCH1C Fits in the Speedtronic Architecture

Follow a thermocouple from the turbine into a Mark VI and it makes exactly three stops: the TBTC terminal board where the wires land, a molded-connector cable, and this card. The IS200VTCCH1C is the VTCC Thermocouple Processor Board, a VME card that plugs into the Mark VI processor rack and receives its 24 field inputs through the rack's lower J3 and J4 connectors — latching connectors, one cable per group of terminal board inputs. Supported sensor types are E, J, K, S, and T thermocouples, alongside raw millivolt inputs across a documented span of -8 mV to +45 mV, converted through a 16-bit analog-to-digital stage and linearized in software per thermocouple type.

Physical replacement is deliberately simple, and GE documents the sequence: power down the VME rack, insert the card and press the top and bottom levers home so the edge connectors seat, tighten the captive screws in the faceplate, reconnect and latch the J3/J4 cables, then power up and read the faceplate diagnostic LEDs — a green run, red fail, and orange status indicator report the card's state. That five-minute mechanical job is precisely why it pays to be certain the card is actually the problem before an outage window opens.

Isolate the Failure: One Channel, One Connector, or the Whole Card

The fastest pre-purchase diagnosis maps the failure pattern onto the signal path:

• One channel misbehaving — sensor territory. Thermocouples age, junctions open, extension wire gets pinched. The card is documented to exclude an input that exceeds hardware limits from its scan specifically so a dying sensor cannot drag down its neighbors; treat an excluded channel as a sensor lead, not a card lead.
• Channels failing by group — cable territory. Each of the two rack connectors carries one terminal block's worth of inputs, so a fault that respects that grouping indicts the J3 or J4 cable, its latch, or the corresponding cold junction reference rather than the card core.
• All channels dead or a fail LED lit — card or rack territory. Reseat once (power down first), watch the LEDs on restart, and note the behavior for your records; that observation is worth including when you request a replacement.
• Plausible but wrong temperatures — compensation territory. Cold junction references on each connector feed the correction math; a shared offset across many channels is a compensation symptom. The documentation is blunt that cold junction error transfers degree-for-degree into readings.

What BD Adds to an IS200VTCCH1C Label

The functional identity here is IS200VTCCH1C: series IS200, function VTCC, hardware group H1, functional revision C. The trailing BD is the manufacturing revision of this particular build — the difference between what the drawing calls the board and what the label on your spare actually says. Group H1 is the deciding field for capability: it covers E, J, K, S, T sensors and the -8 to +45 mV span, while type B, N, or R thermocouples and ranges beyond that span are documented as requiring an H2-group card. When in doubt, send the full string from your label; matching it takes us minutes. The system behind all these fields is explained in the GE Speedtronic Part Number Decoder.

From VTCC to PTCC: Same Signals, Newer Platform

GE kept the thermocouple termination concept remarkably stable across generations. In Mark VI, the TBTC terminal board (simplex or TMR; the TMR version serves the <R>, <S>, and <T> sections) hands its inputs to this rack-mounted VTCC. In Mark VIe, the rack card disappears and an IS220PTCC I/O pack reads the thermocouple terminal board directly over Ethernet-networked I/O. For sites operating both vintages, that continuity simplifies spares strategy — and we stock both sides of it. Background reading: Mark V vs Mark VI: DS200 to IS200; hardware catalog: GE Mark VI IS200 Boards.

Speed Up Your Quote with These Details

• Exact label string — this unit is IS200VTCCH1CBD — and a photo of the label you are matching
• Turbine model and control system generation
• Simplex or TMR, and which terminal board the card reads if known (TBTC or DTTC)
• Quantity, acceptable condition, and required delivery window

Factory-Packaged IS200VTCCH1CBD — Ask for a Quote

Offered here as new surplus in original factory packaging, with warranty terms per the table below. Click Request a Quote; we respond within 24 hours, ship worldwide on DDP terms, and accept purchase orders.

General Information about the Product
Part Number	IS200VTCCH1C Mark VI IS200
Description	GE IS200VTCCH1C IS200VTCCH1CBD Printed Circuit Board Mark VI NEW
Condition	newSurplusFactoryPackage Original Factory Packaged. With 1 Year Warranty.