Description
GE IS2020RKPSG3A | VME Rack Power Supply | Mark VI Turbine Control
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | GE / General Electric |
| Model | IS2020RKPSG3A |
| Functional Acronym | RKPS |
| Series | Mark VI |
| Product Type | VME Rack Power Supply |
| Input Voltage | 125 VDC |
| Output Power | 400 W |
| Rack Power Rails | +5, +12, +15, +28 VDC |
| Remote PSA Output | +28 VDC |
| Additional PSA Outputs | Five +28 VDC outputs |
| Status Output | Status ID output |
| User Control | Front-panel toggle switch |
| Status Indication | Green, red, and yellow LEDs |
| Mounting Location | Right side of VME control/interface rack |
| Functional Revision | A |
| PCB Coating | Normal coating |
| Manual Reference | GEI-100567 |
The is one of several Mark VI RKPS variants, and the variants are not interchangeable simply because they share the RKPS designation. Available documentation identifies the G3A version specifically with a 125 VDC input and 400 W output.
Product Introduction
The is a VME Rack Power Supply Module used in the GE Mark VI Speedtronic turbine control system. Its purpose is to convert the incoming control-rack power into the DC rails required by the VME rack electronics and associated power-distribution circuits. The module is mounted on the right side of the VME control and interface rack and forms part of the rack’s power architecture rather than performing turbine logic or I/O processing.
The is rated for 125 VDC input and 400 W output. Its documented output arrangement includes rack DC rails and multiple +28 VDC PSA outputs. A dedicated status output can reflect the module’s operating condition, while the front-panel toggle switch provides power control and fault-reset functionality. For maintenance teams, the correct RKPS variant is important because GE produced several versions with different input/output requirements.
IS2020RKPSG3A
IS2020RKPSG3A
Application Scenarios & Field Pitfalls — The Engineer’s Perspective
Engineering Pain Point
A Mark VI VME rack can show multiple apparently unrelated controller faults when its rack power supply is deteriorating. Before replacing individual VME cards, maintenance personnel should verify the RKPS input, output rails, status indication, rack connectors, and downstream loading. A power problem at the rack level can easily be mistaken for a CPU, communication, or I/O-card failure.
Typical Applications
Mark VI gas turbine control
The primary application is power distribution within GE Mark VI VME control and interface racks used for gas turbine management.
Mark VI steam turbine control
The same VME rack power architecture can be found in applicable steam-turbine control configurations.
VME controller racks
The RKPS supplies the DC rails required by the VME backplane and associated Mark VI control electronics.
Legacy turbine maintenance
The module remains relevant when maintaining installed Mark VI systems where replacing the entire control platform is not practical.
Technical Pitfalls
- Do not substitute another RKPS variant by appearance alone.
GE produced multiple IS2020RKPS versions. Their input and output requirements differ, so the complete suffix must be matched to the rack documentation. - Verify the 125 VDC source.
The G3A version is specifically documented for 125 VDC input. Some other RKPS versions are associated with different input arrangements. - Check all output rails under load.
Measuring the input voltage alone does not prove that the rack supply is functioning correctly. Verify the relevant +5, +12, +15, and +28 VDC rails and investigate abnormal ripple, undervoltage, or shutdown behavior. - Inspect PSA connections.
The module provides multiple +28 VDC PSA connections. Loose connectors or damaged harnesses can create localized power problems that resemble downstream board failures. - Use the front-panel indicators during diagnosis.
The three LED indicators provide a quick first-level indication of input, fault, and normal operating conditions. The toggle switch also functions as a fault-reset control. - Do not assume Mark VIe compatibility.
Some current reseller listings incorrectly describe the as a Mark VI/Mark VIe power supply. The strongest identification places this exact part in the Mark VI VME rack architecture. Treat Mark VIe substitution as a separate engineering question.
Related Products
- GE IS2020RKPSG1A — Earlier RKPS variant with different power-input/output characteristics.
- GE IS2020RKPSG1AD — Related G1A power-supply configuration.
- GE IS2020RKPSG1AG — Another G1-series RKPS variant.
- GE IS2020RKPSG1AI — Related Mark VI VME rack power supply variant.
- GE IS2020RKPSG2A — Mark VI VME rack power supply variant associated with the 335 VDC output configuration.
- GE IS2020LVPSG3A — Mark VI low-voltage power-supply family; different application from the RKPS.
- GE IS2020LVPSG1A — Related Mark VI low-voltage power supply.
- GE IS2020LNPSG3A — Mark VI power-supply family component with a different rack-power function.
- GE IS2020ISUCG3A — Mark VI/EX2000 unit controller family; a controller rather than a rack power supply.
Procurement Note
For a replacement request, specify the complete number and, where available, the Mark VI rack type, cabinet documentation, serial/ML information, and a photograph of the nameplate. Do not purchase solely against “IS2020 RKPS”, because the G1A, G2A, and G3A variants have different electrical requirements.
For used or surplus inventory, inspect the input connector, PSA connectors, VME-rack mating connections, cooling surfaces, LED operation, and enclosure condition. A meaningful acceptance test should include startup behavior and output-voltage verification under an appropriate load rather than a simple no-load voltage check.
