DS200PANAH2A | 24V 15A PWR Module

Description

Product Introduction

The DS200PANAH2A is the revision-A version of GE’s high-output Mark V power supply. The non-A H2 had a habit of overheating silently—the fan would fail, but the board kept running until the switching transistors cooked. This board tells you when the fan stops.

What did GE change from the H2 to the H2A? Three things. First, the sleeve-bearing fan got swapped for a ball-bearing unit (50,000-hour MTBF vs 25,000). Second, they added a tachometer output on backplane pin 7D—a 5V pulse train that stops when the fan stalls. Third, they increased the heatsink mass by about 30%, which gives you about 45 minutes of runtime after fan failure instead of 20 minutes. To be blunt, if you’re running a fully loaded rack in a warm cabinet and you don’t have the H2A, you’re flying blind on cooling status.

Key Technical Specifications

Compatible Replacement Models

✅ Drop-in Replacement: DS200PANAH2
Original high-output version without fan monitoring. Same pinout, same output ratings. Swaps directly, but you lose the tachometer signal. The H2 also has the shorter-life sleeve-bearing fan. Replace the fan proactively every two years.

✅ Drop-in Replacement: DS200PANAH2B
Later revision with same ball-bearing fan but different tachometer voltage levels (3.3V vs 5V). Swaps directly. Verify your DCS can accept 3.3V logic levels. Most can. If not, add a level shifter.

⚠️ Software Compatible: DS200PANAH1A
Lower output version (24V @ 10A, 5V @ 20A). Same pinout. Swaps directly only if your rack’s 5V draw stays under 18A. The H1A lacks the tachometer output entirely. Your DCS will show a fan fault if it expects that signal. Disable fan monitoring in your DCS configuration before downgrading.

❌ Hardware Incompatible: DS200PANAH1 (any variant)
Different backplane sense pin wiring. The H2A uses sense lines on pins 6D and 6E for remote voltage compensation. The H1 lacks these pins. Installing an H1 in a rack wired for H2A will cause the CPU to see incorrect voltage readings and may trigger a “Power Supply Mismatch” alarm.

Frequently Asked Questions (FAQ)

How do I read the fan tachometer signal?
The tachometer outputs on backplane pin 7D (signal) and pin 8D (ground). Connect to a digital input on your DCS or PLC. The signal is a 5V pulse train (open-collector, so you need a pull-up resistor to 5V—typically already present on the backplane). At full speed (6500 RPM), you’ll see about 217 pulses per second (2 pulses per revolution × 6500 RPM / 60). If the fan stalls, the pulses stop. Monitor for “no pulse for 5 seconds” as a fan-failed alarm.

My H2A tachometer reads pulses but the fan sounds slow. What’s wrong?
The tachometer measures rotational speed, not airflow. If the fan blades are clogged with dust, airflow drops even if RPM stays normal. Inspect the fan intake grille. Use compressed air to clean both the fan blades and the heatsink fins behind the fan. If cleaning doesn’t restore airflow, replace the fan. The tachometer will not warn you about dust buildup.

What’s the typical failure mode on the H2A?
The ball-bearing fan eventually fails, but differently than the sleeve-bearing version. Ball bearings get noisy before they stop—you’ll hear a grinding or rattling sound for weeks or months before complete failure. Replace the fan when you hear noise, not when the tachometer stops. The bearings typically last 50,000-70,000 hours (6-8 years continuous). The switching transistors (Q1-Q4, Infineon IPP60R099C7) are good for 100,000+ hours if kept below 85°C.

Can I replace the fan with a quieter model?
Yes, but be careful. The H2A’s fan control circuit expects a specific current draw (about 100mA at 12V). A quieter fan may draw less current, causing the fan controller to report a fault (the tachometer will show erratic pulses). Stick with the original Sunon MB40201VX-000U-A99 (ball bearing, 28dBA) or the compatible Delta AFB0412SHB (31dBA, slightly louder but more airflow). Do not use a fan rated below 0.8W (about 67mA at 12V). We sell the correct replacement for $15.

How do I test the H2A’s thermal shutdown without overheating the board?
Use a heat gun on low setting (150°C air, held 30cm away). Aim at the thermistor (RT1, near the input terminals). Monitor the 5V output. When the heatsink reaches about 110°C, the board should shut down completely. The PWR LED will go dark. Let it cool for 10 minutes, then cycle AC power. The board should restart. If it doesn’t shut down by 115°C, the thermal protection circuit has failed. Replace the board—the next shutdown will be permanent.

Can I use the H2A in a Mark V rack that originally had an H2?
Yes, with no changes. The H2A is a drop-in upgrade. The additional tachometer signal uses a pin that was unused on the H2. Your DCS won’t see the signal unless you wire it. If you want fan monitoring, add a wire from backplane pin 7D to an available digital input. GE’s backplane wiring diagram (GEI-100945) shows the pinout.

What’s the lead time for a DS200PANAH2A from surplus stock?
1-2 weeks. The H2A is more common than the original H2 because GE shipped it for the last five years of Mark V production. We maintain about 150 units in stock. Price is typically 10-15% higher than the H2 due to the improved fan and monitoring features.

Do you offer any preventive maintenance kit for the H2A?
Yes. The kit includes:

• Replacement fan (Sunon ball bearing, $15)
• Four main input capacitors (470µF 400V, 105°C, $40)
• Thermal compound for switching transistors (Arctic MX-4, $8)
• Replacement thermistor (RT1, 10k NTC, $2)
• Instruction sheet with torque specs and test procedure

Total kit cost: $65. Expect about two hours of labor for a competent technician. We recommend this kit every five years regardless of operating hours. Capacitors age even without power.

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