Description
GE IS220PSVOH1B | Servo Control I/O Pack | Mark VIe Turbine Control
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | GE |
| Model | IS220PSVOH1B |
| Module Type | PSVO Servo Control I/O Pack |
| Control System | Mark VIe / Mark VIeS |
| Pack Power | 28 VDC, 1 A |
| LVDT Input | 7.14 VAC, 3.2 kHz |
| LVDT Excitation Output | 7.14 VAC, 127 mA, 3.2 kHz |
| Speed Input | -15 to +15 VDC |
| Servo Output | -10 to +10 VDC, -120 to +120 mA |
| Speed Sensor Supply | 24 VDC, 40 mA |
| Ethernet | 1 or 2 I/O Ethernet networks |
| Terminal Interface | DC-62 connector |
| Servo Function | Two servo valve position loops |
GE’s Mark VIe certification specifically lists IS220PSVOH1B in PSVO system configurations and specifies 28 VDC, 1 A pack power, LVDT input/excitation characteristics, ±15 VDC speed inputs, and the servo-output range.
Product Introduction
The GE IS220PSVOH1B is a PSVO Servo Control I/O Pack used in Mark VIe turbine-control systems. It provides the electronic interface between one or two I/O Ethernet networks and the associated servo terminal hardware, handling servo-valve signals, LVDT feedback, and speed-related inputs. The PSVO architecture works with the WSVO servo driver for turbine servo-valve position loops.
This distinction matters during procurement. The IS220PSVOH1B is an I/O pack, while the associated terminal board and servo-driver hardware perform different parts of the signal path. Replacing one component without checking the complete PSVO/TSVO/WSVO configuration can leave a turbine control loop incorrectly matched.
IS220PSVOH1B
Application Scenarios & Field Pitfalls — The Engineer’s Perspective
Engineering Pain Point
A servo-control fault on a Mark VIe turbine is not necessarily caused by the PSVO pack. LVDT wiring, servo-driver hardware, terminal-board condition, Ethernet communication, excitation signals, and configuration data all sit within the same control path. The PSVO should therefore be tested as part of the complete servo loop rather than treated as an isolated PCB.
Typical Applications
- Gas and steam turbine servo-valve control
- Electro-hydraulic turbine actuator interfaces
- LVDT position feedback acquisition
- Turbine speed-signal monitoring
- Mark VIe servo-control architectures
- Mark VIeS-compatible control configurations where the applicable hardware combination is certified
Technical Pitfalls
- Do not classify IS220PSVOH1B as an RTD module. Some secondary listings use incorrect product categories. GE documentation identifies PSVO as a Servo Control Module.
- Check the terminal-board combination. GE certification documents show in systems using boards such as IS200TSVCH2A / IS210WSVOH1A and IS400BSVOH1A / IS200TSVCH2A / IS410WSVOH1A. The installed terminal-board revision should be checked before substitution.
- Do not confuse PSVO with WSVO. PSVO is the I/O/interface pack; WSVO is associated with the servo-driver function. They are complementary components, not interchangeable part numbers.
- Verify the LVDT circuit before condemning the pack. GE specifies approximately 7.14 VAC at 3.2 kHz for LVDT excitation/input. Open circuits, incorrect feedback wiring, or damaged actuator wiring can produce symptoms that resemble a failed PSVO.
- Check the servo-output requirements. The certified PSVO configuration specifies a servo output range of -10 to +10 VDC and -120 to +120 mA DC. Do not assume every Mark VIe servo application uses identical actuator wiring or output configuration.
- Configuration matters after replacement. A replacement I/O pack should be checked against the existing Mark VIe hardware configuration, application revision, terminal-board arrangement, and I/O network assignment before returning the turbine to service.
Related Products
- IS220PSVOH1A — Earlier PSVO revision; verify firmware, hardware revision, and application compatibility before substitution.
- IS200TSVCH2A — TSVO servo terminal board associated with documented PSVO configurations.
- IS200TSVCH1A — Earlier Mark VI servo terminal-board family; not automatically interchangeable with the H2A configuration.
- IS210WSVOH1A — Associated WSVO servo-driver hardware in documented PSVO configurations.
- IS400BSVOH1A — Servo terminal-board hardware appearing in certified system combinations.
- IS410WSVOH1A — WSVO servo-driver hardware used in another documented configuration.
- IS220PTURH1A — Mark VIe turbine protection I/O pack; different function from PSVO.
- IS220PAICH1B — Mark VIe analog I/O pack; intended for analog acquisition rather than dedicated turbine servo control.
- IS220PDOAH1B — Mark VIe discrete output pack; different I/O function from PSVO.
Procurement Note
For , match the complete PSVO part number and revision with the installed terminal board, WSVO hardware, I/O Ethernet arrangement, and turbine application configuration. For an outage spare, the most useful verification is the existing PSVO label plus the connected terminal-board part number. Do not approve a substitution based solely on the statement that another PSVO revision is “functionally equivalent.”
