IS220PTURH1A / IS220PTURH1AF: primary turbine protection I/O pack for the Mark VIe

The IS220PTURH1A is the Primary Turbine (PTUR) I/O pack in the GE Speedtronic Mark VIe distributed control system. It is the turbine-specific pack that converts raw field signals into the speed and protection data the controller acts on: passive magnetic speed pickups, generator and bus voltage for automatic synchronizing, and the outputs that help close the main generator breaker. GE builds it as a sealed black module with air-circulation slots, front-panel status LEDs and an infrared port, and it seats on its terminal board through a single DC-62 pin connector. This listing is the IS220PTURH1A in the IS220PTURH1AF hardware revision, supplied as new surplus (open box).

Where the pack lives in the control

Inside the housing are three boards: the common Mark VIe processor board shared by every distributed I/O pack, a turbine-control-specific board, and an analog acquisition daughterboard. The processor board carries two independent 10/100 Ethernet ports, RAM, flash memory, an electronic ID chip, an on-board temperature sensor and a reset/watchdog circuit. Those two Ethernet ports are the pack's IONet link to the Mark VIe controller. In a simplex system one pack runs with one or two network connections; in a TMR system three packs, one each on the <R>, <S> and <T> cores, each take a single IONet connection and their speed and protection signals are voted. The pack normally mounts on the TTURH1C turbine terminal board (it also pairs with the STUR board, and up to three PTURs can alternatively plug onto a TRPAH1A board for primary-trip duty).

Diagnose the fault before you order a PTUR

The turbine-protection pack is one of the parts most often swapped out unnecessarily, because the symptoms it produces usually begin in the field wiring, the terminal board or the network, not in the pack. Rule out the cheap, external causes first:

• Speed reads zero or jumps: the PTUR reads four passive magnetic speed pickups, and its circuit is sensitive enough to see roughly 2 RPM of turning-gear rotation. If one channel drops out while the others stay healthy, suspect the magnetic pickup, its air gap or the cable, not the pack. If all three cores lose the same channel at once, that points even harder at the sensor or wiring, because three packs rarely fail identically.
• Pack will not come online: check the two IONet Ethernet cables, the network switch and the controller before condemning the pack. A dark Link/Act LED is far more often a cable, port or switch problem than a dead pack.
• Terminal board and connector: reseat the DC-62 connector and inspect the terminal block for loose screws, corrosion or moisture. Bent pins and damp terminals imitate a failed pack.
• Synchronizing trouble: a failure to sync or close often lives in the generator and bus PT wiring, the permissive sync relays and the 52G breaker coil that the TTUR board manages, rather than in the PTUR.
• Power feed: confirm the pack is receiving its control power. It has a soft-start current limiter, so a brown-out or a marginal feed can leave it only partly alive.

Read the pack's diagnostics in ToolboxST before you buy. A single-channel fault or a voted-difference alarm tells a very different story than a pack that is completely offline, and it often clears the pack of blame entirely.

Reading the part number and the H1AF revision

The base IS220PTUR identifies the primary turbine I/O function. H1A is the hardware form and group; the trailing letter, the F in IS220PTURH1AF, is the incremental hardware revision of that group. When you order a replacement, match the full printed string, including the group (H1A versus H1B) and the revision letter, to what is installed and to what your controller configuration expects. Our GE Speedtronic Part Number Decoder shows how these IS220 numbers are built, and Mark V vs Mark VI: DS200 to IS200 explains where the Mark VIe pack generation sits.

What to send with your quote request

To quote the correct card the first time, please include the full part number with its suffix (for example IS220PTURH1AF), the revision letter, a clear photo of the pack label, the turbine model and Mark VIe control it serves, whether the machine runs simplex or TMR, the quantity, and how urgent the need is. A label photo is the single most useful thing you can send.

Request a quote

This IS220PTURH1A / IS220PTURH1AF is offered as new surplus (open box). Request a Quote and we reply within 24 hours, ship worldwide DDP with duties and delivery handled, and accept company purchase orders. You can also browse related stock in our GE Speedtronic Turbine Control Boards and GE Mark VI IS200 Boards collections.

General Information about the Product
Part Number	IS220PTURH1A Mark VI IS220
Description	GE General Electric IS220PTURH1A IS220PTURH1AF Input/Output Pack Card For Turbine Control System
Condition	newSurplusNoBox New Surplus Open Box. With 1 Year Warranty