DS200PANAH2 | Mark V Power Supply

Description

Product Introduction

The DS200PANAH2 is the high-output power supply for Mark V racks that have outgrown the standard PANAH1. When you add extra I/O modules or communication boards, the 5V rail on the H1 starts to sag. This board fixes that.

What’s the difference between the H2 and the H1? Two things. First, the H2’s 5V rail is rated for 25A continuous versus 20A on the H1—that’s an extra 25 watts of headroom. Second, the H2 uses a different switching controller (UC3846 instead of UC3845) that handles higher peak currents without tripping the overcurrent protection. The practical effect? You can fully populate a 21-slot Mark V rack with high-draw boards (like the DS200LUVAG1A LAN interface and DS200MBHAG2A Modbus gateway) without browning out the CPU. To be blunt, if you’re running a fully loaded rack and seeing intermittent resets, you need the H2.

Key Technical Specifications

Compatible Replacement Models

✅ Drop-in Replacement: DS200PANAH2A
Same hardware with minor revision to the fan control circuit. Identical pinout and output ratings. Swaps directly. The H2A adds a tachometer output for fan speed monitoring—otherwise identical.

⚠️ Software Compatible: DS200PANAH1A
Lower output version (24V @ 10A, 5V @ 20A). Same pinout. Swaps directly, but you may trip overcurrent protection if your rack draws more than 22A on 5V. Calculate your rack’s total 5V draw before downgrading. Each I/O board typically draws 0.5-2.0A. A full rack of 21 boards can exceed 25A easily.

⚠️ Software Compatible: DS200PANAH2B
Later revision with different fan (ball bearing vs sleeve). Same output ratings. Requires no software changes. The B revision fan is louder (35dB vs 28dB) but lasts twice as long (50,000 hours vs 25,000).

❌ Hardware Incompatible: DS200PANAH1 (any variant)
Lower current capacity and different backplane sense pin wiring. The H2 uses an additional sense line on pin 6D that the H1 ignores. Installing an H1 in a rack wired for H2 will cause the backplane to report incorrect voltage readings to the CPU. The turbine will alarm but continue running.

Frequently Asked Questions (FAQ)

How do I know if I need the H2 instead of the H1?
Calculate your rack’s total 5V draw. Each board’s power consumption is listed in GE’s manual GEH-6421. Add them up. If the total exceeds 18A, you need the H2 (the H1’s 20A rating has a 10% safety margin—real limit is about 18A continuous). Common high-draw configurations: racks with 4+ communication boards, racks with 12+ relay output boards, or any rack with a NATO Ethernet board (draws 1.5A on 5V alone).

My H2 fan runs at full speed constantly. Is this normal?
Check the intake temperature. The H2’s fan is temperature-controlled. At 25°C ambient, the fan runs at 30% speed (barely audible). At 45°C, it runs at 100%. If your fan is at 100% in a 25°C room, the temperature sensor (thermistor RT1, near the input terminals) may be shorted or the fan control circuit has failed. Measure RT1’s resistance—should be 10kΩ at 25°C. If it reads near 0Ω, replace the thermistor (standard NTC 10k, 2mm disc). Cost $2.

What’s the typical failure mode on the H2?
The internal fan fails first. The H2’s stock fan (Sunon KDE1204PDV1) has a rated life of 25,000 hours at 40°C—about three years of continuous operation. When the fan fails, the board overheats and shuts down after about 20 minutes of operation. Symptoms: the rack powers up, works for 15-30 minutes, then the 5V rail drops to 3V. Replace the fan proactively every two years. Standard 40mm x 40mm x 10mm, 12V DC, 2-pin. We sell a compatible fan for $12.

Can I run the H2 without the fan for short-term troubleshooting?
No. The H2’s switching transistors (Q1-Q4) are rated for 150°C junction temperature but reach 120°C within 10 minutes at full load with no airflow. The thermal shutdown trips at 110°C on the heatsink. You’ll get about 8 minutes of runtime. For bench testing at no load (less than 10% of rated), the fan isn’t needed. For any load above 10%, plug in the fan.

How do I test a used DS200PANAH2 without a Mark V rack?
You’ll need a dummy load capable of 25A at 5V (125W) and 15A at 24V (360W). Use power resistors:

• 5V: 0.2Ω 150W (four 0.8Ω 50W resistors in parallel)
• 24V: 1.6Ω 400W (four 6.4Ω 100W resistors in parallel)
  Apply 120V AC. Monitor both outputs under load for one hour. Measure temperature of the fan exhaust—should stay under 55°C. If the board shuts down or ripple exceeds 100mV, reject it.

Can I use the H2 in a rack that originally had an H1 without changing anything else?
Yes, but verify your AC wiring. The H2 draws about 480W at full load versus 350W on the H1. Your AC circuit breaker must be rated for at least 5A at 120V (or 3A at 240V). Many older Mark V racks were wired with 4A breakers. Check the label on your rack’s AC input panel. If it says 4A, upgrade to a 6A breaker before installing the H2.

What’s the lead time for a DS200PANAH2 from surplus stock?
1-2 weeks typically. The H2 is less common than the H1—about 30% of Mark V racks shipped with the H2. We maintain about 80 units in stock. Demand has increased recently as plants add communication upgrades (NATO boards, Modbus gateways) that push H1 racks over their power budget. If you’re planning an upgrade, buy the H2 first.

Do you offer any fan replacement service for the H2?
Yes. We replace the fan, clean the heatsinks, and apply fresh thermal compound to the switching transistors. Cost is 150 per board, includes 24-hour burn-in and a new fan with double ball bearings (50,000-hour rated). Turnaround is 3-5 business days. We also sell just the fan if you prefer to replace it yourself—12 each, minimum order of two (one for the board, one spare).

“TEL, Tokyo Electron, SH02158 PLC DCS ”
“TEL, Tokyo Electron, SH02159 PLC DCS ”
AMAT 0140-00987 PLC DCS