IS2020RKPSG2A GE Mark VI Power Supply – VME Rack Module 400W

Product at a Glance

• IS2020RKPSG2A – VME Rack Power Supply Module from GE for Mark VI turbine control.
• Delivers +5, ±12, ±15, and ±28 V DC to VME backplanes, plus optional 335 V for flame detectors.
• 125 V DC input (powered by PDM) or 24 V DC low‑voltage version.
• Direct replacement for RKPSG1 and LVPSG1 (except remote 28 V count).

Key Technical Specifications

• Part No: IS2020RKPSG2A
• Manufacturer: General Electric
• Series: Mark VI Speedtronic
• Function: VME Rack Power Supply
• Input Voltage: 125 V DC
• Total Output Power: 400 W
• Output Rails: +5, ±12, ±15, ±28 V DC
• Optional PS335: 335 V DC for flame detectors
• Operating Temp: 0 to 60 °C
• Board Size: 6.25 x 4.25 inches
• Weight: 7 lbs
• Manual: GEH‑6421 / GEI‑100567
• Origin: USA

Hardware Design & Layout

• Stand‑alone module with front faceplate (LEDs: yellow, red, green) and locking power switch.
• Faceplate includes space for revision, catalog, and serial numbers.
• Large metal heat sink on the side for passive cooling.
• Top edge: PSA and PSB connectors (power to VME rack).
• Bottom edge: PS125/PS24, PS335, PS28, and PSSTAT connectors.
• Seven major variations exist – verify your rack configuration.

Installation & Mounting

• Mounts on the right‑hand side of the VME rack via sheet metal bracket.
• DC input, 28 V, and 335 V connections are at the bottom.
• Status connector (newer design) also at bottom.
• PSA and PSB at top mate with cable harness to the rack.
• Each of five 28 V modules powers a rack section (A–F).
• P28C or PS28 can power external peripherals.

Operation & Fault Handling

• Single user control: power switch (pull‑to‑lock type).
• Switch toggles outputs and resets faults.
• LED status: yellow (input), red (fault), green (normal).
• Red LED fault – toggle OFF then ON to clear (if cause removed).
• 5 V current limit with under‑voltage detector: if 5 V folds back, other outputs disable until 5 V recovers.

Configuration Options

• External peripheral via P28C or PS28 – move jumper plug from Normal to Isolated position.
• Supports redundant operation.
• PCB coating: normal (standard industrial).

Compatibility & Replacement

• Designed for GE Speedtronic Mark VI gas/steam turbine control systems.
• Direct replacement for RKPSG1 (125 V) and LVPSG1 (24 V).
• RKPSG2 and LVPSG2 differ only in remote 28 V output count.
• Check manual GEH‑6421 for specific rack integration.

Oiltech Controls Insight

• “The IS2020RKPSG2A is a workhorse for Mark VI racks – we see it in 60% of turbine retrofits.”
• “Its redundant design and clear fault LEDs reduce troubleshooting time by half.”
• “We pre‑test every unit to verify 400 W output and all voltage rails before shipping.”

Typical Applications

• GE Speedtronic Mark VI turbine control panels.
• Gas, steam, and wind turbine automation systems.
• VME rack power distribution in power generation plants.
• Replacement for legacy RKPS/LVPS modules in industrial drives.

Frequently Asked Questions (FAQ)

• What is the difference between RKPSG1 and RKPSG2?
  The G2 version offers a different number of remote 28 V outputs; otherwise they are direct drop‑in replacements.
• Can I use this module with a 24 V input?
  Yes – order the LVPSG2 variant; this specific IS2020RKPSG2A is 125 V DC input.
• How do I clear a red fault LED?
  Toggle the power switch OFF, wait 5 seconds, then ON. The fault clears only if the underlying cause is resolved.
• What external devices can I power via PS28?
  Flame detectors, sensors, or small peripherals – use the Isolated jumper setting.
• Does this module support redundant operation?
  Yes – it is designed for redundant configurations in critical turbine control.

Experience‑based Q&A & Selection Guide

• Which faults require full module replacement?
  Internal short circuits or damaged power stages – field repair is not recommended.
• How do I verify if my rack needs the PS335 output?
  Check if you have flame detectors connected to TRPG – if yes, you need the 335 V option.
• Can I mix this with older RKPS modules?
  Mixing is not advised – use identical G2 versions for consistent current sharing.
• What should I check before installation?
  Verify input voltage (125 V), rack slot compatibility, and jumper settings for isolation.
• Why choose Oiltech Controls for this part?
  We pre‑test, offer 12‑month warranty, and support obsolete systems with technical expertise.

Why Buy From Oiltech Controls?

• 15+ years in industrial automation spare parts.
• Global shipping support – fast and trackable.
• Tested surplus / refurbished options available.
• 12‑month warranty on every board.
• Technical verification before shipment.
• Expert support for obsolete control systems.

Contact Information
Sales inquiries: info@oiltechcontrols.com
WhatsApp: +86 158 8020 0923

Copyright © 2026 Oiltech Controls Limited. https://www.oiltechcontrols.com/ All rights reserved.