IS2020RKPSG1AD | Mark VIe Rack Power Supply | OEM New

Description

Product Introduction

The GE IS2020RKPSG1AD is a VMEbus rack power supply module from the Mark VIe Speedtronic series, purpose-built to provide regulated DC power to the Mark VIe control system backplanes. This board converts the plant’s nominal 125 VDC bus (typically from battery-backed DC supplies) into the clean, regulated voltages required by processor boards, I/O modules, and communication interfaces. The “AD” suffix indicates a maximum environment conformal coated board with the highest level of moisture, chemical, and particulate protection available, combined with the G1A revision features.

What sets the RKPSG1AD revision apart is its robust input filtering, wide input voltage tolerance (100–150 VDC), high efficiency (90% typical), comprehensive diagnostics including voltage monitoring, current monitoring, and temperature sensing, and the premium-grade urethane conformal coating that provides maximum protection in the harshest operating conditions. The board delivers 5 VDC at up to 20 A for logic circuits, ±12 VDC at 2 A for auxiliary circuits, and 24 VDC at 3 A for field I/O—all with less than 50 mV ripple under full load. Advanced features include input transient protection, output overvoltage and overcurrent protection, and comprehensive status monitoring. For system integrators requiring a reliable, cost-effective power solution with maximum environmental protection in aggressive environments, this board is the direct OEM solution.

Key Technical Specifications

Key Selling Points & Differentiators

• Maximum Environment Coating Advantage: The “AD” suffix provides the thickest, most robust premium urethane coating (0.10–0.18 mm) rated for continuous exposure to high humidity, salt fog, chemical vapors, and airborne particulates. This is the ultimate protection variant for offshore platforms, coastal installations, desalination plants, chemical processing, pulp and paper mills, and mining operations where environmental contaminants are most severe.
• Multiple Output Rails: 5 V, ±12 V, and 24 V outputs—supplies all Mark VIe backplane power requirements from a single module.
• Wide Input Range: Accepts 100–150 VDC, covering typical plant battery voltages and fluctuations without output dropout.
• Comprehensive Diagnostics: Voltage, current, temperature, and health monitoring for proactive maintenance.
• Comprehensive Protection: Foldback current limiting, overvoltage clamping, input transient protection, and thermal shutdown.
• Efficient Operation: 90% efficiency—balances cost and performance for standard configurations.
• Low Ripple Output: <50 mV peak-to-peak ensures stable operation of sensitive processor and analog I/O boards.
• Live Test Verified: Every board undergoes a 48-hour burn-in at full rated load with cycling input voltage from 100 V to 150 V. We log output voltages, ripple, thermal performance, and diagnostic thresholds. Coated boards are visually inspected for complete coverage, thickness consistency, and absence of bubbles, voids, or pinholes using magnification and UV light.
• 90-Day Warranty: Covers functional defects. If it fails under normal operating conditions, we replace it. No restocking fee for verified returns.
• OEM Traceability: All units come from audited surplus channels with original GE anti-static bags and serialized labels. No clones, no refurbished units with unknown repair history.
• Pre-Shipment Capacitor Reform: For units stored more than 12 months, we perform a controlled capacitor reforming procedure to prevent inrush failures.

Frequently Asked Questions (FAQ)

Q: What does the “AD” suffix mean on IS2020RKPSG1AD?

A: The “AD” indicates maximum environment conformal coating combined with the G1A revision. Specifically, it means the board has a premium-grade urethane conformal coating (0.10–0.18 mm) applied to the entire PCB assembly for the highest level of moisture, chemical, and particulate protection available in the RKPS series, along with all G1A features (20 A 5 V rail, ±12 V, 24 V outputs, comprehensive diagnostics). The coating progression is: G1A (non-coated); G1AD (maximum coated). Electrically and functionally they are identical in terms of power delivery. The coating adds protection; the G1A features provide reliable power capability.

Q: What is the difference between IS2020RKPSG1A and IS2020RKPSG1AD?

A: The G1A is non-coated; the G1AD has maximum environment conformal coating. The coating protects against humidity, salt fog, chemical vapors, and particulates. If your cabinet is in a coastal area, offshore platform, or harsh environment, the AD variant is strongly recommended. In a clean, climate-controlled room, the G1A is sufficient and costs less. If your existing board is coated, you must replace it with a coated board (AD) because the uncoated version will fail faster in that environment.

Q: Does the maximum coating affect power delivery, efficiency, or protection circuitry?

A: Good question. The coating adds about 0.15 mm to the board thickness, which does not affect VME slot fitment—clearances are designed for it. Power delivery, efficiency, ripple, and protection thresholds are identical to the non-coated G1A. The coating does not affect the electrical characteristics of the power supply circuits—it only provides environmental protection. Do not remove the coating or scrape it off—it voids the warranty and compromises protection.

Q: What is the difference between IS2020RKPSG1AD and IS2020LVPSG1A?

A: The RKPSG1AD provides lower current capacity (5 V @ 20 A vs. 25 A, ±12 V @ 2 A vs. 3 A, 24 V @ 3 A vs. 4 A) and lower efficiency (90% vs. 91%). The RKPS is designed for standard configurations with moderate power requirements. The LVPS is designed for heavily loaded configurations requiring higher current capacity. The AD suffix indicates maximum environment coating on the RKPS variant. Choose RKPS for standard systems, LVPS for high-density systems.

Q: What is the difference between IS2020RKPSG1AD and IS200WNPSH1ABA?

A: The RKPSG1AD provides multiple output rails (5 V @ 20 A, ±12 V @ 2 A, 24 V @ 3 A) vs. the WNPS which provides only 5 V (20 A) and 24 V (3 A). The RKPS also has higher efficiency (90% vs. 89%) and comprehensive diagnostics including temperature monitoring, plus maximum environment coating. If your backplane requires ±12 V, choose RKPSG1AD.

Q: Can I use this board with 24 VDC or 48 VDC input instead of 125 VDC?

A: No. The RKPSG1AD is specifically designed for 125 VDC nominal input (100–150 VDC range). Using lower voltages will not produce the required outputs—the converter needs at least 90 VDC to regulate properly. Using higher voltages (above 150 VDC) will damage the input stage. If your plant uses a different DC bus voltage, you’ll need a different power supply variant or an external DC-DC converter upstream.

Q: Is this board hot-swappable?

A: No. The Mark VIe VME backplane does not support live insertion of power boards. You must de-energize the entire rack, wait for all LEDs to extinguish, and discharge the input bus capacitors (use a resistor, not a short). We’ve seen technicians try to pull an RKPS with the rack still powered—it arced across the backplane pins and took out neighboring boards. Don’t risk it.

Q: What is the typical lead time for this part?

A: We stock these on the shelf—usually ship within 24 hours of order placement and payment confirmation. For international orders, add 3–5 days for customs. If you need expedited (overnight air), we can do that, but you’ll need to coordinate with our logistics team for the cut-off time.

Q: Does this board work with both Mark VIe and Mark VIeS (SIL-rated) cabinets?

A: Yes—with a caveat. The RKPSG1AD provides the same voltages for both standard and SIL-rated cabinets. However, SIL systems typically require redundant power supplies (two RKPS boards in parallel with diode isolation). The G1AD can be used in those configurations, but you must ensure your backplane supports the OR-ing diodes. If your SIL system uses IS220RKPS variants, check the diode configuration first. We can help you verify compatibility if you send us your cabinet model.

Q: What’s your return policy if this doesn’t fix my power-related fault?

A: If the board is electrically functional (passes our QC test) but doesn’t clear your fault, we’ll accept a return within 30 days provided the board shows no physical damage, no blown fuses, and no signs of overvoltage stress. We do charge a 15% restocking fee if the fault was due to a downstream short circuit or incorrect input voltage. We’ll work with you over the phone to diagnose the issue before we ship—our goal is to get you running, not to ship boxes back and forth.

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