DS200PANAH2ADD | Mark V High-Power Supply

Description

Product Introduction

The DS200PANAH2ADD is the most rugged power supply GE ever made for the Mark V platform. The standard H2A dies when salt mist, humidity, or freezing temperatures enter the cabinet. This board survives all three.

The “ADD” suffix breaks down like this. First “A” = major hardware revision (same as PANAH2A). First “D” = extreme conformal coating (five coats, 125µm minimum—not the standard three coats on the ABB variant). Second “D” = sealed fan assembly (IP54 rated) and military-spec wide-temp components (-40°C to 70°C). Compared to the standard H2A, this board operates down to -40°C instead of 0°C, survives direct salt spray (tested to MIL-STD-810G), and has a sealed fan that keeps running even with ice on the intake grille. To be frank, if your Mark V rack sits on an offshore platform, in an arctic installation, or in a desert solar plant where sand and condensation kill standard boards, this is the only power supply that lasts more than 18 months.

Key Technical Specifications

Compatible Replacement Models

✅ Drop-in Replacement: DS200PANAH2A
Standard temperature version (0°C to 55°C) with standard conformal coating. Same pinout, same output ratings. Swaps directly, but the standard H2A will fail quickly in ADD environments. Do not substitute in offshore or arctic applications.

✅ Drop-in Replacement: DS200PANAH1ABB
Lower output version (24V @ 10A, 5V @ 20A) with similar environmental rating (ABB suffix). Swaps directly only if your rack’s 5V draw stays under 18A. The ABB rating is good for -20°C to 60°C—less capable than ADD’s -40°C to 70°C.

⚠️ Software Compatible: DS200PANAH2ADD (different date codes)
Later ADD variants (post-2010) use a different fan with PWM speed control instead of the original linear control. Swaps directly but requires no software changes. The tachometer output on pin 7D has a different voltage swing (3.3V vs 5V). Verify your DCS can read 3.3V logic.

❌ Hardware Incompatible: DS200PANAH2 (no suffix)
Standard indoor version with no conformal coating, no sealed fan, and 0°C temperature rating. Physically fits but will fail rapidly in ADD environments. We’ve seen uncoated H2 boards fail within 72 hours in salt fog testing. Do not attempt.

Frequently Asked Questions (FAQ)

How do I visually confirm a genuine ADD board vs a standard H2A with added coating?
Five tells:

1. Fan gasket: ADD boards have a black rubber gasket between the fan and the mounting frame. Standard boards have no gasket—the fan screws directly to the metal.
2. Hydrophobic membrane: Look at the fan intake. ADD boards have a white PTFE membrane (looks like a fine mesh) behind the grille. Standard boards have open grille only.
3. Coating color: Under UV light, ADD boards fluoresce pale green (silicone blend). Standard ABB boards fluoresce blue (pure acrylic).
4. Component markings: ADD boards use military-spec components with “MIL” or “883” markings on ICs. Standard boards use commercial-grade markings.
5. Heatsink color: ADD heatsinks are black anodized (corrosion resistant). Standard are bare aluminum.

What’s the typical failure mode on the ADD board?
The hydrophobic membrane on the fan intake eventually clogs. In dusty environments (deserts, drylands), the membrane traps fine particles. After about 30,000 hours, airflow drops by 50%. Symptoms: the board runs hotter (heatsink temperature above 85°C at 75% load), fan speed increases to maximum and stays there, but the tachometer shows normal RPM. The fix is to replace the fan assembly—the membrane cannot be cleaned effectively. We sell the sealed fan assembly for $45. Do not substitute a standard fan; the board will lose its IP54 rating.

Can I use the ADD board in a standard indoor rack to extend lifespan?
Yes, but it’s overkill. The ADD board will run happily in a clean 25°C control room. However, you’re paying about double the price of a standard H2A for features you don’t need. The ADD’s sealed fan is actually louder (38dBA vs 28dBA) due to the membrane restricting airflow. In a quiet control room, you’ll hear it. Use the standard H2A indoors. Save the ADD for harsh environments.

My ADD board is installed outdoors in a cabinet that sees -35°C winters. Will it cold-start reliably?
Yes, but follow the warm-up procedure. At -35°C, the electrolytic capacitors lose about 60% of their rated capacitance. When you apply full load immediately, the 5V rail may oscillate. GE’s procedure (GEI-101234) calls for:

1. Apply AC power with no load for 3 minutes (heats the capacitors).
2. Apply 25% load for 2 minutes.
3. Apply 100% load after 5 minutes total warm-up.
   We’ve tested ADD boards at -40°C with this procedure. Pass rate is 98%. Without warm-up, the failure rate jumps to 15% on the first cold start of the season.

How do I test the ADD board’s salt fog resistance without a test chamber?
Shortcut method (not MIL-STD compliant but useful for field verification):

1. Mix 5% salt solution (50g table salt per 950ml distilled water).
2. Spray onto the board from 30cm using a fine mist bottle. Focus on the fan intake and backplane connector.
3. Allow to dry for 24 hours at room temperature.
4. Inspect for white residue under magnification (20x). Genuine ADD boards show no residue inside the fan housing or on coated surfaces. Standard boards show salt crystals on exposed copper and component leads.
5. Apply power and run at 75% load for 4 hours. Genuine ADD boards operate normally. Standard boards typically show arcing or intermittent shorts.

What’s the lead time for a DS200PANAH2ADD from surplus stock?
3-6 weeks. These are rare—about 2% of Mark V power supplies shipped were ADD variants. Primary users: offshore oil & gas platforms, arctic pipeline compressor stations, and naval vessels. We maintain about 15 units in stock. When our stock depletes, lead time extends to 8-12 weeks for refurbished units. Price is typically 2-3x the standard H2A.

Do you offer any environmental testing service for ADD boards?
Yes. We can verify that a surplus ADD board still meets its environmental specifications. Testing includes:

• Thermal cycling: -40°C to 70°C, 10 cycles (72 hours)
• Humidity: 95% condensing, 7 days
• Vibration: 5G RMS, 10-500Hz, 4 hours per axis
• Salt fog: 5% solution, 48 hours

Cost is $850 per board. Includes before/after electrical test reports. Turnaround is 10 business days. We do not test boards with visible corrosion or physical damage. Pass rate on surplus ADD boards is about 85%—the other 15% have degraded seals or capacitor damage from improper storage.

Can I retrofit a standard H2A to ADD specifications?
No. The ADD board uses a different PCB substrate (FR-406 high-Tg instead of standard FR-4), military-spec component derating, and a sealed fan assembly that requires different mounting holes. To be frank, we’ve seen one third-party shop attempt this. The resulting board failed salt fog testing within 48 hours. The cost of the retrofit (900+) exceeded the price of a genuine ADD board (1,200-1,500). Just buy the ADD.

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