DS3815PCBA | GE Mark VI IS200 DS3815 PSU | In Stock

Description

Product Introduction

The GE DS3815PCBA is a power supply module for the Mark VI Speedtronic turbine control rack, configured for 48 VDC input with extended temperature capability. This IS200-series PSU converts a 48 VDC plant supply—common in telecommunications-backed turbine installations—into the regulated voltages required by the CPU, I/O boards, and backplane. It’s the extended-temperature equivalent of the DS3815PACA, sharing the same 250W output capacity.

The DS3815PCBA provides three output rails: 48 VDC for the CPU bus (passed through with regulation), 24 VDC for field device loop power, and 5 VDC for logic-level circuits. Total output capacity is 250W. The C in the suffix indicates extended temperature rating—this variant uses higher-grade components rated for -40 to +75°C ambient, compared to the standard -40 to +70°C. Essential for outdoor cabinets, un-air-conditioned turbine decks, or desert environments where ambient temperatures routinely exceed 65°C. 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

• Extended Temperature Range: Rated for -40 to +75°C ambient—5°C higher than standard PACA variants. Critical for un-conditioned enclosures, turbine decks, and desert installations where summer temperatures exceed 65°C. Uses 105°C-rated capacitors and higher-grade switching transistors to handle the extra thermal stress.
• 48 VDC Input with Full 250W Capacity: Direct solution for plants with 48 VDC battery banks—common in telecom-backed turbine installations and offshore platforms. Delivers the same 250W output as the PAAA variant, but from a 48 VDC source.
• Efficient Conversion: >86% efficiency at full load—runs cooler than the PAAA variant, which matters even more in high-temperature environments.
• Direct Mark VI Backplane Interface: Plugs directly into the IS200 rack—same mechanical and electrical fit as other PSU variants. The CPU reads status via backplane signals without any configuration changes.
• Triple Isolated Outputs: Galvanic isolation between 48V, 24V, and 5V rails prevents a fault on one rail from collapsing the others. The 48V output is regulated, not just a pass-through from input.
• Full Load Bank Test at Elevated Temperature: Every unit runs on our test rig at +75°C ambient for 24 hours, pulling full 250W load. We monitor output stability, ripple, and thermal performance. Input reverse polarity and hold-up time verified. 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 DS3815PACA and DS3815PCBA?

Temperature rating and component selection. The PACA has standard -40 to +70°C operation. The PCBA extends the upper limit to +75°C and uses higher-temperature-grade internal components (capacitors, MOSFETs, magnetics). If your cabinet routinely sees +68°C during summer peaks, the PCBA gives you a 7°C margin vs. the standard unit running right at its limit. We’ve seen standard PACA boards shut down at +72°C; the PCBA keeps running.

Q: What’s the difference between DS3815PCBA and DS3815PABA1E1A?

Input voltage and capacity. The PCBA accepts 48 VDC input and delivers 250W. The PABA1E1A accepts 24 VDC input and delivers 150W. Both have extended temperature rating (-40 to +75°C). They are not interchangeable—choose based on your plant’s available DC supply. If you have a 48V battery bank, you want the PCBA. If you only have 24V control power, you need the PABA1E1A.

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

Yes—the PCBA delivers 250W total, which is sufficient for a fully populated rack in most configurations. A full 15-slot rack with CPU, multiple analog I/O, thermocouple boards, relay outputs, and communications modules typically draws 180-200W. You have 50-70W of headroom. However, at elevated temperatures above 65°C, derating applies. At 75°C, you lose approximately 25% of capacity—down to about 187W. If your rack draws 190W and your cabinet runs at 70°C, you’re right at the limit. Calculate your actual load and cabinet temperature before ordering.

Q: How does the temperature derating work on the PCBA?

Above 65°C ambient, the PSU derates output capacity by 2.5% per °C. At 75°C, you lose approximately 25% of capacity—down to about 187W continuous. If your rack draws 200W and your cabinet runs at 70°C, the PCBA will deliver approximately 200W (at the edge of its derated capacity). For high-temperature installations, we recommend calculating your actual load and ensuring adequate cabinet ventilation. No power supply can deliver full rated load at 75°C indefinitely.

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. However, the protection diode is not infinite—repeated reverse polarity events can stress and eventually fail it. Double-check your wiring before applying power.

Q: Can I run two PCBA units in redundant configuration at high temperature?

Yes—the PCBA supports active current sharing for N+1 redundancy at any temperature within its rating. At 75°C, two units in parallel will each run at approximately 50% load, which reduces internal heating and extends component life. A single PSU running at 80% load at 75°C will have a significantly shorter life than two PSUs each running at 40% load. We can supply matched pairs tested for current sharing across the full temperature range. It’s a higher upfront cost, but in extreme environments, it pays for itself in reliability.

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). Check for failing modules or reduce the load. If red is on, the PSU is overtemperature—check cabinet ventilation and ambient temperature. The PCBA will tolerate higher temps before tripping, but it will eventually shut down to protect itself.

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

No user-replaceable fuse. The PCBA uses solid-state current limiting and reverse polarity protection. If the PSU doesn’t power up, it’s either input power missing, a wiring error, or internal failure. Do not open the casing—internal capacitors hold charge even after power removal. Send it to us for evaluation or scrap it properly.

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

No. The DS3815PCBA is a backplane-specific module with a proprietary connector and output ramp timing. The CPU expects the 48V, 24V, and 5V rails to rise within a specific sequence and timing window. We’ve seen customers wire a DIN-rail supply directly to the backplane—it works briefly, then the CPU watchdog trips during startup because the 5V rail rose 200 ms after the 48V rail. GE engineered this timing for a reason. Stick with the original board.

Q: I’m in a hot environment with 48 VDC available. Should I choose PCBA over PACA?

Absolutely—if your cabinet temperature routinely exceeds 65°C. The PCBA is specifically designed for that condition. If your cabinet stays below 60°C, the standard PACA will serve you fine and cost less. Before deciding, check your cabinet temperature log—many plants think they have a heat problem when it’s actually poor airflow. Clean your filters, verify your cabinet fan is running, and measure actual temperature at the PSU intake. If it’s consistently above 65°C, the PCBA is the right call.

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