GE IS2020RKPSG2A Mark VI Speedtronic VME Rack Power Supply Module

The GE IS2020RKPSG2A Power Supply Module is a critical component within General Electric's Mark VI Speedtronic turbine control platform—one of the most widely deployed control systems for heavy-duty gas turbines and steam turbines in power generation, oil & gas, and industrial cogeneration plants worldwide. This VME rack-mounted power supply converts a 125 V DC station battery input into multiple isolated DC output voltages (+5V, ±12V, ±15V, ±28V, and optional 335V DC) required by the Mark VI control processor, I/O modules, and protective relay systems.

At Aeliya Marine Tech, we understand that turbine control system downtime can cost power plants $50,000–$2,50,000 per day in lost generation revenue. That's why we stock and rigorously test critical spares like the GE IS2020RKPSG2A—so you can restore your Mark VI system to full operation quickly and cost-effectively. This used, certified unit comes with our 30-day operational warranty, free worldwide shipping, and direct access to our turbine controls engineering support team.

Product Overview: GE IS2020RKPSG2A Mark VI Power Supply

The GE Mark VI Speedtronic control system, introduced by General Electric as part of their evolutionary turbine control platform, represents the sixth generation of GE's renowned Speedtronic family. It combines distributed control architecture with triple modular redundancy (TMR) for safety-critical turbine protection functions. The Mark VI is used on virtually all GE heavy-duty gas turbines including the Frame 5, Frame 6B, Frame 7EA, Frame 7FA, Frame 9E, and Frame 9FA models, as well as selected steam turbine applications.

Within the Mark VI architecture, the IS2020RKPSG2A serves as the VME rack power supply—the module responsible for providing clean, regulated DC power to all VME-based control boards in the protection core. Unlike conventional single-output power supplies, this unit generates six regulated DC voltages simultaneously from a single 125 V DC input, reflecting the diverse power requirements of analog circuits (±15V), digital logic (+5V), communication interfaces (±12V), and relay/solenoid drivers (±28V). The optional 335V DC output supports certain specialized I/O configurations.

The "IS2020" prefix designates this as part of GE's Integrated Controls (IC) product line within the Mark VI family. The "RKPS" suffix stands for "Rack Power Supply," and "G2A" indicates the second hardware revision with enhanced filtering and transient protection compared to the original G1 release. The companion reference manual is GEI-100567, available from GE's documentation portal.

This unit's 7 lbs (3.2 kg) weight and standard VME 6U form factor make it one person installable in the field—an important consideration when turbine control room access is limited or when performing hot-swap replacement during brief maintenance windows.

Technical Specifications

Parameter	Specification
Manufacturer	General Electric (GE)
Part Number	IS2020RKPSG2A
Product Family	GE Mark VI Speedtronic
Function	VME Rack Power Supply Module
Input Voltage	125 V DC (station battery / DC bus)
Input Voltage Range	100–150 V DC (typical operating range)
Total Output Power	400 W
+5 V DC Output	Digital logic power for processor boards
±12 V DC Output	Analog interfaces and communication circuits
±15 V DC Output	Precision analog I/O and sensor excitation
±28 V DC Output	Relay coils, solenoid drivers, contactor logic
Optional 335 V DC Output	Specialized high-voltage I/O (optional configuration)
Operating Temperature	0°C to +60°C
Form Factor	VME 6U (standard rack-mount)
Physical Weight	7 lbs (3.2 kg)
Country of Origin	USA
Reference Manual	GEI-100567
Condition	USED – Tested & Certified Operational

Key Features & Benefits

• Multi-Voltage DC Output (400W Total): Generates six regulated DC voltages (+5V, ±12V, ±15V, ±28V) plus optional 335V DC from a single 125V DC input—eliminating the need for multiple external power supplies and simplifying rack wiring.
• 125 V DC Station Battery Input: Designed to operate directly from the plant's 125V DC station battery system (per IEEE 485), ensuring uninterrupted turbine control power even during AC grid disturbances or black-start conditions.
• Wide Input Voltage Tolerance (100–150 V DC): Accommodates battery voltage variations during charge/discharge cycles and transient dips without output regulation degradation—critical for maintaining control integrity during plant upsets.
• 0°C to +60°C Operating Range: Rated for turbine control room environments where ambient temperatures may reach 55°C due to heat from adjacent equipment. No derating required across the full temperature range.
• VME 6U Rack-Mount Form Factor: Standard mechanical dimensions allow direct installation in any Mark VI VME control rack without adapters or chassis modifications. Front-panel extraction handles enable hot-swap replacement in under 2 minutes.
• Individual Output Protection: Each output channel features independent overcurrent, short-circuit, and overvoltage protection with auto-recovery—preventing a fault on one voltage rail from cascading to others and causing total control system shutdown.
• Front-Panel Status Indication: LED indicators for input power presence, individual output voltage status, and fault conditions enable rapid diagnostic assessment without removing the module from the rack.
• G2A Revision Improvements: The G2A hardware revision incorporates enhanced input filtering for improved electromagnetic compatibility (EMC), upgraded capacitors for extended service life, and refined thermal management compared to earlier G1 variants.
• Significant Cost Savings vs. New: This tested used unit represents approximately 50–60% savings compared to new OEM pricing, with immediate availability versus 12–20 week lead times for factory-new Mark VI spares.

Applications: GE Mark VI Speedtronic Turbine Control Systems

The GE IS2020RKPSG2A is specifically engineered for GE's Mark VI Speedtronic control platform. Understanding where and how this power supply is deployed helps maintenance engineers and plant managers appreciate its critical role and plan spares inventory accordingly.

Heavy-Duty Gas Turbine Control

The Mark VI controls the full range of GE heavy-duty gas turbines used in power generation and mechanical drive applications:

• Frame 5 (MS5001): 25–35 MW class, widely used in industrial cogeneration and mechanical drive
• Frame 6B (MS6001B): 40–42 MW class, popular in combined-cycle power plants
• Frame 7EA (MS7001EA): 85 MW class, one of the most installed gas turbines worldwide
• Frame 7FA (MS7001FA): 171 MW class, advanced F-class technology for combined-cycle plants
• Frame 9E (MS9001E): 125 MW class, E-class workhorse for baseload and peak power
• Frame 9FA (MS9001FA): 255 MW class, advanced F-class for large combined-cycle installations

In each application, the IS2020RKPSG2A powers the <P> core—the protection core of the Mark VI that handles turbine startup sequencing, speed control, temperature control, combustion monitoring, and protective tripping functions. Loss of this power supply results in immediate turbine trip, making it one of the highest-criticality spares in any Mark VI-equipped plant.

Steam Turbine Control

GE also deploys the Mark VI platform for steam turbine control in combined-cycle plants, industrial process steam applications, and district heating systems. The IS2020RKPSG2A provides identical power supply functions for the steam turbine VME rack, supporting governing valves, extraction control, and protective overspeed trip logic.

Oil & Gas Mechanical Drive

Gas turbines driving natural gas compressors, crude oil pumps, and LNG refrigeration compressors in pipeline and production facilities use the Mark VI for speed/torque control and process integration. These installations often operate in remote locations where spare parts availability is limited—making pre-positioned spares like the IS2020RKPSG2A essential for minimizing mean time to repair (MTTR).

Marine Gas Turbine Applications

certain naval and commercial marine propulsion systems using GE LM2500 or LM6000 aeroderivative gas turbines, the Mark VI (or Mark VIe derivative) provides propulsion control. The IS2020RKPSG2A's 125V DC input compatibility matches marine electrical systems, and its compact 7 lb weight simplifies shipboard spares storage.

Why Buy From Aeliya Marine Tech?

Installation & Replacement Guide

Replacing a failed GE IS2020RKPSG2A in a Mark VI VME rack is straightforward but must follow proper procedures to ensure personnel safety and prevent damage to adjacent control modules. Only qualified electrical technicians familiar with turbine control systems should perform this work.

Step 1: Safety Precautions & Lockout/Tagout

Before beginning work: (1) Place the turbine control system in COOLDOWN or OFF mode per plant procedures, (2) De-energize the 125V DC supply to the VME rack at the distribution panel, (3) Apply lockout/tagout devices per OSHA 1910.147, (4) Verify zero voltage with a calibrated DC voltmeter at the rack input terminals, (5) Wear an anti-static wrist strap grounded to the rack chassis before handling any circuit boards.

Step 2: Remove the Failed Module

Locate the failed IS2020RKPSG2A in the VME rack (typically position 1 or 2, leftmost slot). Record the exact slot position for the replacement. Depress the upper and lower extraction levers simultaneously and pull the module straight out along the guide rails. Place the failed module in an anti-static bag for return or disposal.

Step 3: Inspect the Rack & Backplane

Visually inspect the VME backplane connectors for bent pins, carbon tracking, or heat damage. Clean any dust or debris from the guide rails using a lint-free cloth and isopropyl alcohol. Verify the rack chassis ground connection is tight (10 Nm).

Step 4: Install the Replacement Module

Remove the replacement IS2020RKPSG2A from its anti-static packaging. Align the module with the guide rails and backplane connector. Push firmly but evenly until the extraction levers engage and lock with an audible click. Ensure the front panel is flush with adjacent modules.

Step 5: Re-energize & Verify

Remove lockout/tagout and energize the 125V DC input. Within 2 seconds, verify: (1) Input power LED illuminates solid green, (2) All output status LEDs illuminate (typically 5–7 green LEDs), (3) No fault indicators (red LEDs) are lit. Using a calibrated digital multimeter, measure each output voltage at the test points or diagnostic connector per GEI-100567 table 3-2.

Step 6: System Checkout

With the control system powered, verify that all VME boards in the rack complete their boot sequence and report healthy status on the <I> station HMI. Check for any diagnostic alarms related to power supply or VME communications. Record replacement date, serial number, and test results in the plant's maintenance management system (CMMS).

Critical Safety Note: Never attempt to hot-swap the IS2020RKPSG2A while the Mark VI is executing a turbine start or while the unit is online. Loss of control power during operation will initiate an immediate turbine protective trip, potentially causing thermal stress to hot gas path components. Always coordinate with plant operations before performing control system maintenance.

Frequently Asked Questions (FAQ)

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External Technical Resources

• AX Control IS2020RKPSG2A Product Page – Cross-reference data and technical documentation.
• GE Gas Power Digital & Controls – Official GE resource for turbine control systems and upgrades.
• IEEE Standards – Reference for IEEE 485 (station battery sizing) and IEEE 519 (power quality) applicable to turbine control power systems.