Description
Product Overview
The GENERAL ELECTRIC IS2020RKPSG2A is a VME Rack Power Supply Module used in the GE Mark VI SPEEDTRONIC turbine control system.
The module is designed to mount on the side of the Mark VI VME control and interface rack. Its primary job is to convert the incoming DC supply into the multiple DC voltage rails required by the VME backplane and associated control electronics. The standard configuration is rated for 400 W total output with a 125 VDC input.
The IS2020RKPSG2A is particularly identifiable by its 335 VDC output capability, which can be used for flame detector equipment connected through TRPG. It also provides multiple +28 VDC outputs for distribution to sections of the VME rack.
Product Summary
Manufacturer: General Electric
Model: IS2020RKPSG2A
Series: Mark VI SPEEDTRONIC Turbine Control
Functional Acronym: RKPS
Product Type: VME Rack Power Supply Module
Input: 125 VDC
Total Output Rating: 400 W
Primary DC Outputs: +5 VDC, ±12 VDC, ±15 VDC, ±28 VDC
Additional Output: 335 VDC for applicable flame detector applications
Operating Temperature: 0 to 60°C
Mounting: Side of VME control/interface rack
Technical Datasheet
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric |
| Model | IS2020RKPSG2A |
| Product Type | VME Rack Power Supply Module |
| Series | Mark VI SPEEDTRONIC |
| Functional Acronym | RKPS |
| Input Voltage | 125 VDC |
| Total Output Power | 400 W |
| VME Outputs | +5 VDC, ±12 VDC, ±15 VDC, ±28 VDC |
| Additional Output | +335 VDC |
| 28 VDC Distribution | Five rack-section outputs plus remote +28 VDC output |
| Operating Temperature | 0 to 60°C |
| PCB Coating | Normal coating |
| Mounting Location | Right-hand side of VME rack |
| Front Indicators | Yellow, Red, Green LEDs |
| User Control | Locking power switch |
| Application | GE Mark VI turbine control systems |
| Manual References | GEH-6421 / GEI-100567 |
| Typical Weight | Approx. 6.5–7 lb, depending on source/configuration |
Specifications above are compiled from available technical references; exact installation configuration should be checked against the existing Mark VI rack.
Main Features
Multiple DC Output Rails
The power supply generates the DC voltages required by the VME rack, including +5 VDC, ±12 VDC, ±15 VDC, and ±28 VDC. This allows one supply assembly to support several voltage requirements within the turbine control rack.
400 W Output Rating
The IS2020RKPSG2A has a total output rating of 400 W. It is intended for the power requirements of the Mark VI VME rack rather than general-purpose VME installations.
335 VDC Output
One of the important characteristics of this G2 configuration is the 335 VDC output. The output can be used for flame detector equipment connected to TRPG in applicable Mark VI configurations. This makes the exact model number important when selecting a replacement.
Five 28 VDC Power Modules
The assembly incorporates multiple 28 VDC power modules used to supply different sections of the VME rack. The rack sections are identified as A, B, C, D, E, and F, with an additional remote +28 VDC output available through the PS28/P28C connection.
Front-Panel Status Indication
The front face includes a locking power switch and three status LEDs. The indicators provide information for input power, fault status, and normal operation. The power switch can also be used as a fault-reset control when appropriate.
Functional Description
In a Mark VI VME control cabinet, the IS2020RKPSG2A is mounted on the side of the VME rack using a sheet-metal bracket.
The incoming 125 VDC supply is connected through the lower portion of the assembly. The module then distributes the required DC voltages to the VME backplane and rack electronics.
At the top of the assembly, PSA and PSB connectors interface with the rack cable harness. Bottom connections include the DC input, 28 VDC output, 335 VDC output, and, on newer designs, a status connector.
The supply also supports an isolated 28 VDC output for an external peripheral device when the associated jumper is placed in the appropriate isolated position. This configuration should only be changed with the correct Mark VI documentation and wiring information available.
Input Configuration
The IS2020RKPSG2A is the 125 VDC version of the G2 VME rack power supply family.
References for the RKPS family also describe a separate low-voltage version for 24 VDC applications. This should not be confused with the 125 VDC IS2020RKPSG2A. Verify the complete part number before replacement.
Installation Guide
Before installing an IS2020RKPSG2A, isolate the cabinet power and follow the applicable GE Mark VI maintenance procedures.
Recommended replacement steps include:
- Record the existing power-supply model and revision.
- Photograph the existing cable connections.
- Confirm the incoming supply is the correct 125 VDC configuration.
- Disconnect the rack harness and external power connections.
- Remove the mounting hardware from the side bracket.
- Inspect connectors and cable terminals for damage or contamination.
- Install the replacement module in the same mounting position.
- Reconnect PSA, PSB, DC input, 28 VDC, 335 VDC, and status connections as applicable.
- Verify grounding and cable routing.
- Perform controlled power-up and check all status indicators.
Do not connect a 24 VDC supply to a 125 VDC configuration simply because both units belong to the same RKPS family.
Maintenance
The IS2020RKPSG2A is normally installed inside an industrial turbine control cabinet, so inspection should include both the power supply and its surrounding rack environment.
Recommended maintenance checks:
- Inspect the heat-sink area for dust accumulation.
- Check cooling airflow around the module.
- Inspect PSA and PSB connectors.
- Check for loose or oxidized terminals.
- Inspect the DC input wiring.
- Check the 28 VDC and 335 VDC connections.
- Verify that the front switch operates correctly.
- Check yellow, red, and green status indicators.
- Inspect the mounting bracket and hardware.
- Look for overheating, discoloration, or damaged components.
A red fault indication should be investigated before repeatedly cycling the power switch.
Replacement Compatibility
The G2 version of the VME rack power supply was designed as an updated version of the earlier G1 configuration. Technical references identify the RKPSG2 as a replacement for RKPSG1, with differences including the number of remote 28 VDC outputs.
For an actual field replacement, however, the complete Mark VI rack configuration should be checked. Pay particular attention to:
- Input voltage
- 335 VDC requirement
- 28 VDC output distribution
- Rack harness connections
- Status connector configuration
- Revision level
- Existing flame detector arrangement
Application Areas
The IS2020RKPSG2A is primarily associated with GE Mark VI turbine control installations.
Typical applications include:
- Gas turbine control systems
- Steam turbine control systems
- SPEEDTRONIC Mark VI control cabinets
- VME-based turbine control racks
- Turbine protection and monitoring systems
- Industrial power-generation equipment
Its role is power distribution and conversion within the control architecture rather than direct turbine process control.
FAQ
Q: What is the IS2020RKPSG2A?
It is a GE VME Rack Power Supply Module used in Mark VI SPEEDTRONIC turbine control systems.
Q: What is its input voltage?
The IS2020RKPSG2A is the 125 VDC input version.
Q: What is the output power?
The listed total output rating is 400 W.
Q: What voltages does it provide?
The main outputs are +5 VDC, ±12 VDC, ±15 VDC, and ±28 VDC. The G2 configuration also provides a 335 VDC output for applicable flame detector applications.
Q: Is IS2020RKPSG2A a general-purpose VME power supply?
No. It is specifically associated with GE Mark VI VME turbine control racks and should be matched to the existing system configuration.
Q: Can IS2020RKPSG1 replace IS2020RKPSG2A?
The G2 was designed as a replacement for the G1 configuration, but the number and arrangement of remote 28 VDC outputs differ. Confirm the actual rack wiring and application before substitution.
Inspection Before Shipment
For industrial automation spare-parts supply, the following inspection points are recommended:
- Confirm GE model number: IS2020RKPSG2A
- Verify nameplate and serial number
- Check revision marking
- Inspect front-panel switch
- Check all three status LEDs
- Inspect PSA and PSB connectors
- Inspect bottom-side connectors
- Check heat-sink condition
- Inspect PCB and wiring for visible damage
- Verify mounting hardware
- Perform power-up testing where the appropriate test equipment is available
Because this module contains multiple output rails and a 335 VDC circuit, testing should be performed by qualified personnel using the appropriate Mark VI test procedure and electrical safety controls.
Recommended Related Models
- GE IS2020RKPSG1 – Earlier VME Rack Power Supply configuration
- GE IS2020LVPSG1 – Low-voltage VME power supply configuration
- GE IS2020LVPSG2 – Low-voltage G2 configuration
- GE IS2020RKPSG2A – 125 VDC VME Rack Power Supply
- GE Mark VI VME Control Rack Modules
- GE Mark VI VME Interface Modules
These are related family/configuration references and should not automatically be treated as drop-in substitutes.
Product Keywords
GENERAL ELECTRIC IS2020RKPSG2A
GE IS2020RKPSG2A
IS2020RKPSG2A VME Rack Power Supply
GE Mark VI Power Supply
GE SPEEDTRONIC VME Power Supply
125 VDC 400 W Power Supply
GE Turbine Control Power Supply
Mark VI VME Rack Power Supply Module
