GE IS220PTURH1B, Rev B: primary trip and speed pack for Speedtronic Mark VIe

Every GE Speedtronic Mark VIe turbine has one I/O pack that owns the machine's speed feedback and its primary protection path, and that pack is the Primary Turbine (PTUR) module. This IS220PTURH1B in hardware revision Rev B is that pack, offered here used, cleaned and tested. It sits between the turbine terminal board and the controller, digitizing speed, generator and bus voltage, and turbine-protection signals, then delivering them to the Mark VIe controller over IONet.

Signals the IS220PTURH1B handles

The pack acquires four passive magnetic speed inputs and derives a median speed that the controller uses both for speed control and for the primary overspeed trip. Generator and bus voltages are brought into the pack so the control and the GE excitation system can synchronize the unit automatically, while the associated TTUR terminal board carries the permissive synchronizing relays (K25 and K25P) and the 52G main-breaker coil. GE's documentation for this pack also lists additional turbine-protection signals routed through the terminal board, including flame-detection and shaft voltage/current inputs. Physical connections are a three-pin power input, dual RJ45 IONet ports, and the DC-62 pin output that mates with the terminal board.

Is it really the pack? Field checks before you replace an IS220PTURH1B

Because the PTUR carries protection functions, a nuisance trip or a lost signal creates pressure to swap it fast, yet the root cause is usually outside the pack. Work through these before ordering:

• Compare the <R>, <S> and <T> votes. In a TMR machine, open ToolboxST and see whether one core disagrees or all three see the same disturbance. Agreement across all three cores almost always means the field signal, not three simultaneous pack failures.
• Overspeed or spurious trips: inspect the magnetic speed pickups, their air gaps and their cabling. A noisy or intermittent pickup can drive a false overspeed indication that looks exactly like a pack fault.
• Will not synchronize: trace the generator and bus PT circuits, the permissive relays and the 52G coil on the TTUR board before suspecting the PTUR's synchronizing path.
• Offline or no IONet: verify both Ethernet cables, the switch and the controller. The pack can run from either port, so try the alternate port to isolate a cable fault.
• Firmware, not hardware: if a known-good pack will not take its configuration, confirm that auto-reconfiguration is enabled in the ToolboxST Component Editor and that the controller holds the correct baseload; a mismatch can masquerade as a bad pack.

H1B, Rev B and matching the exact card

In the number IS220PTURH1B, IS220PTUR is the primary turbine function, H1B is the hardware group, and the revision (here Rev B) tracks incremental hardware changes within that group. H1A and H1B are distinct groups, so do not assume they are freely interchangeable; match the printed group and revision to your installed pack and controller configuration. The GE Speedtronic Part Number Decoder breaks the format down field by field.

Simplex and TMR wiring at a glance

A simplex system uses one PTUR with one or two IONet connections. A TMR system uses three PTURs, one on each of the <R>, <S> and <T> cores, each with its own IONet connection; every core gets its own set of four speed inputs while the remaining signals are fanned to all three, and the control votes the results before acting on the protective relays. Knowing which architecture you run helps confirm how many packs you actually need.

Details that make your quote accurate

Send the full part number and suffix (IS220PTURH1B), the revision (Rev B or the trailing letter on your label), a photo of the module label, the turbine and Mark VIe control model, simplex or TMR, quantity, and your timeline. If you are matching a set of three for a TMR core, tell us so we can confirm consistent revisions across the set.

Get a quote in 24 hours

This used IS220PTURH1B, Rev B is cleaned and tested. Request a Quote for a response within 24 hours, worldwide DDP shipping, and purchase orders welcome. You can explore more in the GE Speedtronic Turbine Control Boards collection.

General Information about the Product
Part Number	IS220PTURH1B Mark VI IS220
Description	GE General Electric IS220PTURH1B REV. B Turbine I/O Module Mark VI
Condition	used Cleaned and Tested. With 1 Year Warranty.