A Single-Slot Mark VI Controller for Steam, Gas and Aeroderivative Units

The IS215UCVGH1A is a single-slot VME controller from GE's Innovation Series, the processor that runs the turbine application inside a Mark VI Speedtronic rack. The same UCVG hardware is loaded with software specific to the machine it protects — steam, gas, land-marine aeroderivative (LM) or balance-of-plant (BOP) — so the board you hold is generic until the toolbox configuration makes it a steam controller or a gas controller. That flexibility is why the UCVG turns up across so many different GE turbine sites.

Functionally, the controller solves the control blocks and exchanges data with the I/O across the VME bus through the VCMI communication board. GE rates the controller to execute on the order of 100,000 rungs or blocks per second for a typical mix, and it synchronizes to the VCMI clock so that a redundant set stays in step to within microseconds.

Symptoms That Look Like a Bad Controller but Are Not

A controller that alarms is not always a controller that failed. Work through the common impostors first:

• Wrong or mismatched configuration. Every power-up the UCVG checks its stored configuration against the hardware it finds. A load mismatch after maintenance reads like a hardware fault — verify the configuration and firmware in the toolbox before pulling the board.
• VCMI, backplane and seating. All process data reaches the controller through the VCMI over the VME bus. A VCMI problem, a tired backplane, or a board that is not fully seated can imitate a controller failure.
• Field and I/O boards. If only certain signals are wrong, the fault is far more likely in an I/O board or the field wiring than in the central controller.
• Redundancy. On a TMR machine, read the diagnostics to see which of <R>, <S> or <T> disagreed instead of swapping the whole set.

How the UCVG Talks to the VCMI and the I/O

The controller does not connect to field devices itself. External data moves to and from the control-system database over the VME bus, handled by the VCMI communication board; in a simplex rack that is simply the process I/O, while in a TMR rack it is the voted inputs, the singular inputs from any simplex boards, the outputs to be voted by the output hardware, and the internal state shared between controllers. Two Ethernet ports handle the outside world — one to the UDH for configuration and peer-to-peer, one on a separate subnet for Modbus or EGD — with RS-232C on COM1 for setup and COM2 for a DCS link. The QNX real-time operating system underneath is what keeps all of this deterministic.

The H1A Suffix and Backplane Compatibility

IS215UCVGH1A reads as the IS215 assembly of the UCVG controller, hardware group H1, revision A. A helpful property of this family is that a UCVG can drop into the slot of an earlier UCV controller without changing the backplane, so when you match a spare you are matching the generation and confirming the revision rather than hunting for one identical suffix. Record the full string from the label and we will confirm interchangeability.

Where UCVG Sits in the UCV Family

UCVG is one step in the UCVD / UCVE / UCVG progression of Innovation Series controllers, each generation lifting processor performance while keeping the VME footprint and the toolbox engineering workflow. Consolidating a site on one generation of spare is common and sensible. If you are still running Mark V alongside Mark VI, the Mark V vs Mark VI: DS200 to IS200 guide maps the older DS200 controls onto these boards, and the GE Speedtronic Part Number Decoder breaks down the numbering. Browse more control hardware in our GE Speedtronic Turbine Control Boards catalog.

Details We Need to Quote Accurately

For a fast, correct match, please provide:

• The complete part number and suffix (IS215UCVGH1A) with the label revision, and a photo if you can.
• The turbine type (steam, gas, LM or BOP) and whether the rack is simplex or TMR.
• Any companion rack boards, such as the VCMI, you want matched.
• Quantity and lead-time urgency.

Request Your IS215UCVGH1A Quote

This IS215UCVGH1A is offered used, cleaned and tested, with a one-year warranty. Let us know your turbine platform and the revision you need to match and we will confirm what is in stock. We return quotes within 24 hours, ship worldwide DDP, and accept purchase orders from qualified operators and EPCs. Press the Request a Quote button to get started.

General Information about the Product
Part Number	IS215UCVGH1A Mark VI IS215
Description	IS215UCVGH1A By General Electric Single Slot Mark VI IS215 VME Controller Card
Condition	used Cleaned and Tested. With 1 Year Warranty.