Description
GE IS220PPROH1A | Mark VIe PPRO Backup Turbine Protection I/O Pack
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | GE |
| Part Number | IS220PPROH1A |
| Product Family | Mark VIe |
| Function | PPRO Backup Turbine Protection |
| Module Type | Protection I/O Pack |
| Processor | BPPB |
| Nominal supply | 28.0 VDC |
| Supply range | 27.4–28.6 VDC |
| Maximum supply current | 0.37 A DC |
| TREA voltage detection input | 16–140 VDC |
| TREA E-stop input | 18–140 VDC |
| SPRO/TPRO PT input | 0–138 VAC |
| PT input frequency | 5–66 Hz |
| SPRO/TPRO speed input | -15 to +15 VDC |
| TREA contact output | Up to 28 VDC, 7 A |
| TPRO speed-sensor output | 24 V nominal, 25 mA maximum |
| Communication | Mark VIe IONet |
| Protection architecture | Simplex / TMR backup protection |
GE’s Mark VIe documentation specifies a 28.0 VDC nominal supply, with an allowable 27.4–28.6 VDC range and maximum stated current of 0.37 A DC for the PPRO protection module. The same documentation provides the associated protection input/output ratings.
Product Introduction
The GE IS220PPROH1A is a Mark VIe PPRO Backup Turbine Protection I/O Pack used for independent turbine protection functions. Its role extends beyond ordinary signal acquisition: the PPRO architecture provides backup overspeed protection, a backup check associated with generator synchronization, and independent monitoring of the primary control system.
The module operates with dedicated protection terminal boards rather than being treated as a general-purpose Mark VIe I/O pack. GE identifies IS200SPROH1A, IS200SPROH2A, IS200TPROH1C, IS200TPROH2C, IS200TREAH1A, and IS200TREAH3A as approved accessory terminal boards for IS220PPROH1A in the documented Mark VIe protection architecture.
IS220PPROH1A
Application Scenarios & Field Pitfalls — Engineer’s Perspective
Engineering Pain Point
The biggest replacement risk is treating IS220PPROH1A as an ordinary Mark VIe I/O pack. It belongs to the turbine protection path, where terminal-board selection, protection wiring, network assignment, processor revision, and trip logic all matter.
Typical Applications
- Backup turbine overspeed protection on Mark VIe turbine-control systems.
- Generator synchronization backup associated with turbine protection.
- Independent watchdog function for the primary Mark VIe control.
- Simplex or TMR backup protection architectures, depending on the installed terminal-board and control configuration.
Technical Pitfalls to Avoid
- Do not treat it as a generic Ethernet I/O module.
PPRO is part of the turbine protection architecture. Its IONet connection and terminal-board interfaces have a specific protection role. - Match the terminal board before approving the replacement.
GE’s documentation specifically lists the compatible SPRO, TPRO, and TREA terminal-board families. A physically compatible connector does not establish functional compatibility. - Check the processor revision.
IS220PPROH1A is associated with the BPPB processor board. A later PPRO variant may use a different processor board and software compatibility requirements, so do not substitute by model-family name alone. - Do not skip the protection test after replacement.
Because PPRO participates in turbine trip and backup protection functions, replacement should be followed by appropriate I/O verification, speed-input verification, trip-path testing, and confirmation of the configured Mark VIe protection logic.
Related Products
- IS220PPROS1B — later PPRO protection I/O pack variant; associated with a BPPC processor board and different software compatibility considerations. It should not be assumed to be a direct configuration-equivalent replacement.
- IS220YPROS1A — Mark VIeS YPRO Backup Turbine Protection I/O Pack; intended for the Mark VIeS architecture rather than ordinary PPRO substitution.
- IS200SPROH1A — Simplex Protection terminal board compatible with the PPRO protection architecture.
- IS200SPROH2A — alternate SPRO terminal-board configuration for PPRO.
- IS200TPROH1C — TPRO protection terminal board for applicable turbine protection configurations.
- IS200TPROH2C — alternate TPRO terminal-board configuration.
- IS200TREAH1A — TREA emergency trip terminal board supported with .
- IS200TREAH3A — alternate TREA terminal-board configuration.
- IS220PPDAH1A — Mark VIe PDM diagnostic I/O Pack; diagnostic function is different from PPRO protection.
Procurement Note
For , the procurement record should include the complete part number, processor-board revision, installed terminal board, Mark VIe/ControlST software environment, IONet topology, and the existing protection configuration.
Do not approve a replacement solely because it is labeled “Mark VIe PPRO”. GE’s documentation distinguishes the original from the later IS220PPROS1B, and the processor/software combination can affect replacement planning.
For a safety-related turbine protection component, the correct acceptance test is more important than the physical condition of the spare: verify the protection inputs, IONet communication, configured logic, and complete trip path before returning the turbine to service.
