Stocking a Spare IS200TTURH1CFD Ahead of an Outage

Because the TTUR is the terminal board that carries a Mark VI turbine's speed sensing and generator synchronizing signals, it's a reasonable board to keep on the shelf rather than source under time pressure — which is exactly what this factory-packaged IS200TTURH1CFD is for. Field wiring for magnetic speed pickups, potential transformer voltage inputs, and shaft voltage/current sensors terminates on two 24-position screw terminal blocks (TB1, TB2, rated up to #12 AWG), with jumpers JP1 and JP2 configuring the board for simplex or TMR relay-drive operation — a setting you'll want to confirm matches your unit before installing a spare. A third block, TB3, supports optional TTL active speed pickups that need external power.

The TTUR doesn't process these signals itself; that happens on a separate VME card, VTUR, in the R/S/T Control Module, reached from the TTUR by cable through six connectors (JR1/JR5, JS1/JS5, JT1/JT5). Once turbine speed and generator/bus voltages are matched, the board closes the generator breaker by energizing coil 52G at a nominal 125 V DC, gated through permissive relays K25, K25P, and K25A, with an external synch check relay and 52G/a breaker feedback contact adding further protection.

Confirm the Diagnosis Before You Install This Spare

A ready spare is only useful if the failure has actually been traced to the terminal board:

• For synchronizing failures, check PT wiring and fuses, the external synch check relay, and the 52G/a breaker feedback contact first.
• For speed or overspeed alarms, check the magnetic pickup air gap and its cable to TB1/TB2/TB3 — a drifted pickup or damaged cable is far more common than a board failure, and shows up as a channel voting disagreement in TMR systems rather than a clean fault.
• For shaft voltage or current alarms, suspect a grounding brush or bearing insulation issue on the shaft train itself; the board only monitors that condition, using built-in DC and AC test circuits to confirm wiring continuity.
• Check for loose TB1/TB2 terminals and properly seated JR/JS/JT connectors before assuming hardware failure.

Once the diagnosis is confirmed and the JP1/JP2 jumper settings on this spare are verified against your unit's configuration, installation should be straightforward.

Reading the IS200TTURH1CFD Part Number

IS200 is the platform prefix, TTUR the function code, and H1CFD the group and revision — H1C for the group/generation, FD for this specific hardware revision. Match the complete string against your nameplate; H1C and the H1B-series TTUR boards in this collection are different hardware generations built around the same core function. Our GE Speedtronic Part Number Decoder explains how a full IS200 string is structured.

Related Boards

The TTUR's VME companion is VTUR, in the Control Module. The generator breaker trip circuit also runs through the TRPG terminal board (driven by VTUR) and, in the Backup Protection Module, the TREG terminal board (driven by VPRO). For older equipment, see our Mark V vs Mark VI: DS200 to IS200 guide and GE Mark V DS200 Boards Explained article. Browse the rest of the family in our GE Mark VI IS200 Boards collection or the wider GE Speedtronic Turbine Control Boards collection.

What to Include in Your Quote Request

• Full part number with suffix: IS200TTURH1CFD
• Revision from the label
• Photo of the ID label
• Turbine/generator model and unit ID
• Planned spares stocking or urgent need
• Quantity

Request a Quote

This IS200TTURH1CFD is new surplus, factory packaged, with a 1-year warranty (see table below). We quote every order directly rather than posting prices online — submit a Request a Quote and expect a response within 24 hours. We ship worldwide DDP, accept purchase orders, and support both planned spares programs and urgent breakdown orders.

General Information about the Product
Part Number	IS200TTURH1C Mark VI IS200
Description	IS200TTURH1C By General Electric IS200TTURH1CFD Turbine Control Board NSFP
Condition	newSurplusFactoryPackage With 1 Year Warranty.