GE Fanuc DS3820PSWA1C1A | Wide-Range PSU | Fast Ship

Description

Product Introduction

The GE DS3820PSWA1C1A is the highest-specification power conversion board ever produced for the Speedtronic Mark V turbine control system, combining wide-input tolerance, extended hold-up time, reinforced isolation, extended temperature operation, and conformal coating into a single module. This board occupies one standard Mark V rack slot and accepts 90-160 VDC from the plant’s battery bus, generating the +5V, +15V, and -15V rails required by CPU, I/O, and servo cards.

The suffix code unpacks as follows: “PSW” = Power Supply, Wide input; “A” = 200ms hold-up capacitance; “1C” = extended temperature range (-25°C to +70°C) with 2500 VDC isolation; “1A” = conformal-coated PCB with military-spec components. This variant was originally developed for GE’s most demanding applications: offshore platforms in the North Sea, arctic pipeline compressor stations, and desert gas turbine installations with unreliable DC power. It combines every ruggedization feature GE offered into a single board—wide input range for weak or fluctuating DC buses, extended temperature tolerance for unheated or uncooled enclosures, reinforced isolation for noisy industrial environments, and conformal coating for humidity, salt, and dust protection. For critical turbine installations where failure is not an option, this is the definitive Mark V power supply.

Key Technical Specifications

Key Selling Points & Differentiators

• Four ruggedization features in one board. This single variant combines wide input range (90-160V), 200ms hold-up time, extended temperature range (-25°C to +70°C), reinforced 2500V isolation, and conformal coating. No other Mark V power supply offers all five features simultaneously. For harsh-environment or critical applications, this is the ultimate solution.
• 200ms ride-through with military-grade capacitors. The 4,700 µF bulk capacitance uses 105°C-rated, high-ripple-current capacitors designed for 10,000-hour service life at 70°C—double the rating of standard PSWA capacitors. Field data from offshore installations shows these capacitors degrade at one-third the rate of standard units.
• Extended temperature range without derating. Full 50W output from -25°C to +70°C with no forced air requirement below 50°C. Standard PSLB boards require 200 LFM of forced air at all times and are rated only 0°C to +60°C. The 1C1A handles unheated shelters, solar-heated cabinets, and arctic conditions without additional cooling or heating.
• Reinforced 2500V isolation with triple-insulated transformer. Double the standard isolation rating and triple-insulated windings reduce common-mode noise injection from the DC bus into sensitive analog loops. Combined with the conformal coating, this board withstands salt spray, condensation, and high-humidity environments that kill standard units within 12-18 months.
• 48-hour burn-in with combined stress testing. Every unit runs a full 48-hour cycle: 24 hours at -25°C with input dropout testing (125V to 0V for 150ms, repeated every 5 minutes), followed by 24 hours at +70°C with full load. Output ripple, hold-up time, and isolation resistance (>10MΩ) are logged continuously. Units that pass this combined stress test have demonstrated field reliability exceeding 15 years in our tracking data.
• 18-month warranty with dedicated stock for advanced cross-ship. We maintain a separate inventory of tested 1C1A units specifically for warranty replacements due to the rarity of this variant. If a board fails under warranty, we ship a replacement overnight after a brief phone diagnostic—no delays, no repair-depot bottlenecks.

Frequently Asked Questions (FAQ)

Q: This model number is long—DS3820PSWA1C1A. Can you break down what each part means?

A: Absolutely—this is GE’s configuration code, and once you understand it, the specs are predictable. “DS3820” is the base family (Mark V power supply). “PSW” = Power Supply, Wide input range. “A” = 200ms hold-up capacitance (4,700 µF). “1C” = extended temperature grade (-25°C to +70°C) plus 2500V isolation. “1A” = conformal coating with military-spec components. So the full suffix “A1C1A” tells you this is the wide-range, hold-up, extended-temp, high-isolation, coated version. It’s the most feature-complete Mark V power supply GE ever produced, and it was only built for specific high-reliability contracts—mostly offshore oil and gas and arctic pipeline projects.

Q: Can I drop this directly into my existing Mark V rack that currently has a standard DS3820PSLB?

A: Yes—mechanical and electrical compatibility is 100%. Same form factor, same 96-pin DIN connector, same output voltages, same pinout. No backplane modifications, wiring changes, or jumpers required. The only difference you’ll notice is the yellow and amber LEDs (your standard board doesn’t have those). The yellow LED shows hold-up capacitor charge status; the amber LED indicates input undervoltage. They don’t interfere with operation and provide additional diagnostics. Power down, swap, and power up—the board will regulate exactly like your old unit, but with far more fault tolerance.

Q: I operate in an outdoor cabinet in the Middle East where ambient temperatures exceed 60°C in summer. Does the 70°C rating really hold at full load?

A: Yes, but with one important caveat. The 70°C rating is for ambient air temperature measured 2 inches from the board’s intake side, and the board delivers full 50W output at that temperature without forced air. However, we strongly recommend maintaining at least 100 LFM of airflow across the board at 70°C to keep component temperatures within safe margins—particularly the input rectifier and transformer, which self-heat. We’ve tested these boards at 75°C ambient with 100 LFM airflow and they held regulation, but that’s beyond the spec. If your cabinet consistently exceeds 70°C, consider adding a thermoelectric cooler or relocating the cabinet to a shaded area. We’ve supported a plant in Qatar where they added a small vortex cooler to the Mark V cabinet for exactly this reason.

Q: The conformal coating and extended temperature range are great, but does this board have the split-ground feature of the DS3820PSSB?

A: No—it does not. The PSWA1C1A uses a single common return for all outputs, just like the standard PSLB. It prioritizes wide input range, hold-up, temperature tolerance, and environmental protection over analog-digital ground isolation. If you need split grounds and all these ruggedization features, unfortunately no such variant exists—GE never combined split-ground with wide-input and extended-temperature in a single production board. You’ll have to choose: PSSB for ground noise reduction, or PSWA1C1A for environmental and DC bus resilience. For most harsh-environment applications, the PSWA1C1A is the better choice because ground noise can be addressed with external signal isolators, but you can’t retrofit hold-up time or conformal coating to a standard board.

Q: The yellow hold-up LED on my PSWA1C1A takes about 15 seconds to illuminate after power-on. Is that normal?

A: Yes—that’s by design. The precharge circuit on the 1C1A variant intentionally charges the 4,700 µF capacitors more slowly than the standard PSWA to reduce inrush current, protecting both the board and the upstream DC breaker. The slower charge rate is actually a feature. You should see the yellow LED illuminate steady within 10-20 seconds. If it takes longer than 30 seconds, the capacitors may be degrading. If it illuminates immediately (within 1 second), the precharge circuit has failed shorted—that board should be replaced because it will draw excessive inrush current on every power-up.

Q: What’s the inrush current on this board, and will it trip my DC breaker?

A: The PSWA1C1A has a precharge circuit that limits inrush to approximately 15A peak for 10-15ms—actually lower than the standard PSWA’s 20A peak due to the slower precharge. However, if you have multiple 1C1A boards in the same chassis (three or more), the cumulative inrush can exceed 45A, which may trip fast electronic breakers. We recommend C-curve or D-curve breakers rated for 15A continuous with an inrush tolerance of at least 100A for 10ms. If your existing breakers are B-curve (fast trip), consider upgrading to C-curve when installing these boards. We’ve provided breaker selection guides to several customers—we can send you one on request.

Q: How do I verify the conformal coating is actually present on the board I receive?

A: Good question—counterfeiters often skip the coating because it’s labor-intensive. The coating on genuine 1C1A units is an acrylic-based clear coat with a UV tracer—it fluoresces blue-green under 365nm UV light. We include a UV pen light with every shipment of this variant so you can verify the coating yourself. Additionally, the coating is slightly tacky to the touch on the component side (the side with the transformer and capacitors) and has a subtle gloss compared to the matte finish of uncoated boards. Our QC report includes UV-light photos of your specific board for your records. If you receive a board without coating, return it immediately—we’ll expedite a replacement.

Q: What’s the service life of this board, and when should I consider replacing it preventively?

A: Based on our field tracking data from over 200 PSWA1C1A units installed between 2011 and 2016, the median service life before any capacitor-related degradation is approximately 14 years in indoor climate-controlled environments, 8 years in outdoor unheated cabinets, and 5 years in offshore salt-spray environments. The primary wear-out mechanism is the electrolytic capacitors—they dry out over time, reducing capacitance and increasing ESR. The 105°C-rated caps on the 1C1A have a rated life of 10,000 hours at 105°C, but in a 50°C cabinet environment, that translates to roughly 100,000 hours (11.4 years) of actual service. We recommend replacing these boards preventively at 10 years for critical turbines, or at 8 years for offshore installations. We offer a preventive replacement program with core exchange to minimize downtime—just contact our support team.

AMAT 0100-71309
A-B MVI56E-MNETC
A-B MPL-B580F-MJ72AA