DS3815PCPA | Mark VI IS200 DS3815 Power Supply | New Surplus

Description

Product Introduction

The GE DS3815PCPA 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 into the regulated voltages required by the CPU, I/O boards, and backplane. It is the extended-temperature equivalent of the DS3815PACA, sharing the same 250W output capacity and 48 VDC input but rated for -40 to +75°C ambient instead of -40 to +70°C.

The DS3815PCPA 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 C in the suffix indicates extended temperature rating—this variant uses higher-grade components rated for -40 to +75°C ambient. The P in the suffix (PCPA vs. PCBA) indicates standard output filtering (not the enhanced filtering found on L-suffix variants). This is the workhorse PSU for high-temperature installations where ultra-low ripple is not a requirement. 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. Uses 105°C-rated capacitors and higher-grade switching transistors to handle thermal stress in un-conditioned cabinets and turbine decks.
• 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.
• Cost-Effective High-Temperature Solution: The PCPA provides extended temperature rating at a lower cost than the PCLA (enhanced filtering) or PCMA (MIL-spec coating) variants. If you don’t need ultra-low ripple or conformal coating, this is the most economical choice for high-temperature environments.
• Efficient Conversion: >86% efficiency at full load—runs cooler than the PAAA variant, which matters in high-temperature cabinets.
• 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.
• 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. 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 DS3815PCPA?

Temperature rating. The PACA is rated for -40 to +70°C. The PCPA is rated for -40 to +75°C. Both accept 48 VDC input and deliver 250W with standard filtering. The PCPA uses higher-grade internal components (105°C capacitors, improved semiconductors) to handle the extra 5°C. If your cabinet regularly exceeds 65°C, the PCPA is the right choice. If it stays below 60°C, the PACA will serve you fine and cost less.

Q: What’s the difference between DS3815PCPA and DS3815PCBA?

They are the same PSU. The naming convention used by GE sometimes shows PCPA and sometimes PCBA for the same specification. Both indicate 48 VDC input, 250W output, standard filtering, and extended temperature rating (-40 to +75°C). The letters reflect GE’s internal revision tracking. If you see either variant, they are functionally identical and interchangeable.

Q: What’s the difference between DS3815PCPA and DS3815PCLA?

Output filtering. The PCPA has standard filtering (<50 mV ripple on 5V). The PCLA has enhanced filtering (<20 mV ripple on 5V). Both have the same 48 VDC input, 250W capacity, and extended temperature rating. If you have sensitive analog I/O (thermocouples, vibration probes, 4-20mA), the PCLA is worth the extra cost. If you don’t have sensitive analog, the PCPA is the more economical choice.

Q: What’s the difference between DS3815PCPA and DS3815PCMA?

Coating and filtering. The PCMA has MIL-spec conformal coating (double-sided) and enhanced filtering (<20 mV on 5V). The PCPA has no conformal coating and standard filtering (<50 mV on 5V). Both have the same 48 VDC input, 250W capacity, and extended temperature rating. The PCMA is for corrosive environments (offshore, marine, chemical). The PCPA is for high-temperature but clean environments.

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

Yes—the PCPA 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. If your rack draws 190W and your cabinet runs at 70°C, you’re at the limit. Consider reducing load or adding redundant PSUs for headroom.

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. Double-check your wiring before applying power.

Q: Can I run two PCPA units in redundant configuration?

Yes—the PCPA supports active current sharing for N+1 redundancy. Two units in parallel will each run at approximately 50% load, reducing internal heating and extending component life, especially at high temperatures. We can supply matched pairs tested for current sharing across the full temperature range.

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. The PCPA will tolerate higher temps before tripping than the PACA, 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 PCPA 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 even after power removal. Send it to us for evaluation.

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

No. The DS3815PCPA is a backplane-specific module with 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 DIN-rail supplies cause watchdog trips due to timing mismatches. Stick with the original board.

Q: I’m in a hot environment but don’t have sensitive analog. Is the PCPA the right choice?

Yes—this is exactly the application for the PCPA. It gives you the extended temperature range without the added cost of enhanced filtering or conformal coating. In our experience, the PCPA is the most cost-effective PSU for high-temperature installations that don’t require ultra-low ripple or environmental protection. If your cabinet stays below 65°C, consider the PACA instead to save more. If your cabinet runs at 70°C, the PCPA is the minimum you should consider.

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