DS3815PCMA | GE Speedtronic IS200 Power Board | Ready to Ship

Description

Product Introduction

The GE DS3815PCMA is a power supply module for the Mark VI Speedtronic turbine control rack, configured for 48 VDC input with extended temperature capability and MIL-spec conformal coating. This IS200-series PSU converts a 48 VDC plant supply into the regulated voltages required by the CPU, I/O boards, and backplane. It is the most ruggedized variant in the DS3815 power supply family, combining extended temperature rating with full PCB encapsulation for harsh-environment protection.

The DS3815PCMA provides three output rails: 48 VDC for the CPU bus, 24 VDC for field device loop power, and 5 VDC for logic-level circuits. Total output capacity is 250W. The M in the suffix indicates MIL-spec conformal coating—this variant has a thicker, more durable coating than the 1D1D revision, applied to both sides of the PCB for complete protection against moisture, salt spray, dust, and chemical contamination. Critical for offshore platforms, marine installations, desert environments, and chemical processing areas where corrosive atmospheres are present. The module includes the same backplane-specific connector as all Mark VI power supplies, sliding directly into the rack and communicating status (voltage good, overcurrent, overtemperature) to the CPU via discrete signals.

Key Technical Specifications

Key Selling Points & Differentiators

• MIL-Spec Conformal Coating: Thicker, double-sided coating that fully encapsulates the PCB. Protects against salt spray, moisture, dust, and chemical vapors. Essential for offshore, marine, and corrosive industrial environments. This is the most aggressive environmental protection available in the DS3815 PSU family.
• Extended Temperature Range: Rated for -40 to +75°C ambient. Uses 105°C-rated capacitors and higher-grade semiconductors. Suitable for un-conditioned outdoor cabinets and high-temperature turbine decks.
• 48 VDC Input with Full 250W Capacity: Direct solution for plants with 48 VDC battery banks—common in offshore, marine, and telecom-backed installations. Delivers full power for heavily populated racks.
• High-Vibration Tolerance: Components are secured with industrial adhesive. Connectors are heavy-duty with gold-plated contacts for reliable connections in high-vibration environments.
• Full Load Bank Test at Elevated Temperature with Environmental Verification: Every unit runs on our test rig at +75°C ambient for 24 hours, pulling full 250W load. We perform a visual inspection under UV light to verify coating coverage. Capacitors replaced on units manufactured before 2015.
• Surplus/Refurbished with 1-Year Warranty: New surplus (original GE packaging) or professionally refurbished. 1-year warranty, 30-day return.

Frequently Asked Questions (FAQ)

Q: What’s the difference between DS3815PCLA1D1D and DS3815PCMA?

Coating thickness and coverage. The 1D1D has conformal coating applied to the component side of the PCB only (standard industry practice). The PCMA has MIL-spec coating applied to both sides of the PCB, with a thicker layer (0.05-0.10 mm vs. 0.02-0.05 mm). The PCMA also uses higher-grade coating material with better salt spray resistance. If you’re in a marine environment with salt-laden air, the PCMA provides significantly better protection. If you’re in a standard industrial environment, the 1D1D is sufficient and costs less.

Q: What’s the difference between DS3815PCMA and DS3815PCBA?

Coating and ruggedization. The PCBA has standard temperature rating (-40 to +70°C) and no conformal coating. The PCMA has extended temperature rating (-40 to +75°C) and MIL-spec double-sided conformal coating. They share the same 48 VDC input and 250W capacity. The PCMA is the environmentally hardened version; the PCBA is the standard version. If your cabinet is in a clean, climate-controlled room, the PCBA is the cost-effective choice. If you’re offshore or in a corrosive atmosphere, the PCMA is required.

Q: Can I use this PSU to power a full 15-slot Mark VI rack?

Yes—the PCMA delivers 250W total, sufficient for a fully populated rack in most configurations. At temperatures above 65°C, derating applies. At 75°C, you lose approximately 25% of capacity—down to about 187W. Calculate your actual load and cabinet temperature before ordering. The conformal coating doesn’t change the electrical capacity or derating characteristics.

Q: What’s the correct polarity for the 48 VDC input?

The input terminals are labeled “+” and “−” on the front panel. Polarity matters—reverse polarity will trigger the internal protection diode and the PSU will not power up. Correct the polarity and it will start normally. The PCMA’s terminals are gold-plated for corrosion resistance in marine environments.

Q: Can I run two PCMA units in redundant configuration in a marine environment?

Yes—and this is highly recommended for offshore installations. The PCMA supports active current sharing for N+1 redundancy. Two units in parallel will each run at approximately 50% load, which reduces internal heating and extends component life. In marine environments, redundancy is critical because a single PSU failure can cause an unplanned shutdown. We can supply matched pairs tested for current sharing across the full temperature range. Both units receive the same MIL-spec coating and environmental verification.

Q: How does the conformal coating affect heat dissipation?

Minimally. The coating is thin enough (0.05-0.10 mm) that it doesn’t significantly impede heat transfer from components. We’ve measured less than 1°C temperature increase on coated boards vs. uncoated at full load. The coating actually helps thermal management by protecting the PCB from moisture-related corrosion, which can create thermal hotspots. In our testing, coated boards run cooler over their lifetime because they don’t accumulate corrosion on component leads.

Q: What are the status LED patterns indicating?

Three LEDs on the front panel: DC OK (green), Overload (yellow), Overtemperature (red). Normal: green steady, yellow off, red off. If yellow is steady, you’re in current limit—your rack is drawing more than 250W (or the derated capacity at high temp). If red is on, the PSU is overtemperature—check cabinet ventilation. The conformal coating does not affect LED visibility.

Q: Is there a fuse on this board that I can replace in the field?

No user-replaceable fuse. The PCMA uses solid-state current limiting. If the PSU doesn’t power up, it’s either input power missing, wiring error, or internal failure. Do not open the casing—internal capacitors hold charge. The conformal coating makes field repair even more difficult. Send it to us for evaluation.

Q: Can I use a standard 48 VDC DIN-rail power supply instead of this board in a marine environment?

Absolutely not. The DS3815PCMA is a backplane-specific module with proprietary connector and output ramp timing. A DIN-rail supply won’t match the timing, and it won’t survive the marine environment without conformal coating. We’ve seen DIN-rail supplies fail in offshore environments within months due to corrosion. Stick with the original board.

Q: I’m offshore and have persistent PSU failures from salt air. Should I upgrade to the PCMA?

Yes—this is exactly the application the PCMA was designed for. Offshore platforms have constant salt spray, high humidity, and vibration. Standard PACA and PCBA units have failed in these environments due to corrosion on component leads and connector contacts. The PCMA’s MIL-spec double-sided conformal coating and gold-plated connectors address these failure modes. We’ve supplied PCMA units to several offshore operators with significant reduction in PSU replacement frequency. In one case, a customer went from replacing PSUs every 12-18 months to 5+ years of reliable service after switching to the PCMA.

Q: Is the PCMA compatible with standard Mark VI racks?

Yes—it fits the same IS200 backplane slot as all other DS3815 PSU variants. No adapter plates or mechanical modifications needed. The backplane connector is identical, and the gold-plated contacts provide better corrosion resistance than standard tin-plated connectors. If you’re replacing a standard PACA or PCBA with a PCMA, it’s a direct swap—same dimensions, same connector, same terminal layout. No software changes required.

Q: How do I verify the conformal coating is intact on a used unit?

We perform a UV light inspection on every refurbished PCMA unit. The coating fluoresces under UV, making any cracks, bubbles, or missing areas visible. We reject any unit with compromised coating and recoat it before shipping. We include a UV inspection report with every PCMA shipment. In the field, you can do a quick visual inspection under a UV flashlight—any dark spots indicate missing coating. If you find damage, the board should be recoated before installation.

Q: The PCMA is expensive. Can I just add my own conformal coating to a standard PCBA?

Technically yes, but we strongly discourage it. Conformal coating application requires specific skills and equipment: proper cleaning (sonic bath), masking of connectors and test points, controlled spray thickness, and UV curing. We’ve seen field-applied coating that was too thick (causing overheating), too thin (offering no protection), or applied over contamination (trapping moisture under the coating, causing accelerated failure). The cost of a proper PCMA is lower than the cost of a field failure due to coating issues. If you absolutely must, send us the PCBA and we’ll professionally coat it—but the cost is close to buying a PCMA outright.

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