DS3815PDLA | GE Speedtronic IS200 Power Board | Ready to Ship

Description

Product Introduction

The GE DS3815PDLA is a power supply module for the Mark VI Speedtronic turbine control rack, configured for 125 VDC input with extended temperature capability and enhanced output filtering. This IS200-series PSU converts a 125 VDC plant supply—the most common turbine control bus voltage—into the regulated voltages required by the CPU, I/O boards, and backplane. It combines the extended temperature rating of the PCPA variant with the enhanced output filtering found on L-suffix variants, all while accepting 125 VDC input.

The DS3815PDLA 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 D in the suffix indicates 125 VDC input capability. The L indicates enhanced output filtering (<20 mV on 5V rail). The C in the suffix indicates extended temperature rating (-40 to +75°C). This is the premium 125 VDC input PSU—it combines high-temperature tolerance with ultra-clean outputs for sensitive analog measurements. 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

• 125 VDC Input Compatibility: Direct solution for plants with 125 VDC battery banks—the most common turbine control bus voltage. No step-down transformer or separate power supply needed. Standard Mark VI cabinet input.
• Enhanced Output Filtering: <20 mV ripple on the 5V rail and <50 mV on 24V/48V rails. Protects sensitive analog measurements from power supply noise—essential for thermocouple, vibration, and 4-20mA inputs.
• Extended Temperature Range: Rated for -40 to +75°C ambient—5°C higher than standard PAAA variants. Uses 105°C-rated capacitors and higher-grade semiconductors.
• Full 250W Capacity: Sufficient for heavily populated 15-slot racks with multiple I/O modules.
• Direct Mark VI Backplane Interface: Plugs directly into the IS200 rack—no configuration changes required. The CPU reads status via backplane signals.
• Full Load Bank Test at Elevated Temperature with Noise Measurement: Every unit runs on our test rig at +75°C ambient for 24 hours, pulling full 250W load. We measure output ripple on all three rails with a 100 MHz oscilloscope and verify it stays below spec. 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 DS3815PDLA and DS3815PAAA?

Temperature rating and output filtering. The PAAA has standard temperature rating (-40 to +70°C) and standard filtering (<50 mV on 5V). The PDLA has extended temperature rating (-40 to +75°C) and enhanced filtering (<20 mV on 5V). Both accept 125 VDC input and deliver 250W. The PDLA is the premium version for high-temperature installations with sensitive analog measurements. The PAAA is the standard workhorse.

Q: What’s the difference between DS3815PDLA and DS3815PCLA?

Input voltage. The PDLA accepts 125 VDC input. The PCLA accepts 48 VDC input. Both have extended temperature rating (-40 to +75°C) and enhanced filtering (<20 mV on 5V). They are not interchangeable—choose based on your plant’s available DC supply. If you have 125 VDC battery banks (most common), you want the PDLA. If you have 48 VDC telecom-style power, you need the PCLA.

Q: What’s the difference between DS3815PDLA and DS3815PCPA?

Filtering. The PDLA has enhanced filtering (<20 mV on 5V). The PCPA has standard filtering (<50 mV on 5V). Both accept 125 VDC input and have extended temperature rating (-40 to +75°C). If you have sensitive analog I/O, the PDLA is worth the extra cost. If you don’t, the PCPA is the more economical choice.

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

Yes—the PDLA 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. The enhanced filtering is especially valuable if your rack has multiple thermocouple or analog input modules.

Q: What’s the correct polarity for the 125 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. In 125 VDC battery systems, polarity is almost always clearly marked, but we’ve seen field errors.

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

Yes—the PDLA 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). If red is on, the PSU is overtemperature—check cabinet ventilation.

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

No user-replaceable fuse. The PDLA 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. Send it to us for evaluation.

Q: Can I use a standard 125 VDC DIN-rail power supply instead of this board?

No. The DS3815PDLA 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. Stick with the original board.

Q: I have a hot turbine deck with sensitive analog. Is the PDLA the right choice?

Yes—this is exactly the application for the PDLA. It gives you the 125 VDC input compatibility (most common in turbine panels), extended temperature range for hot decks, and enhanced filtering for sensitive analog measurements. It’s the premium 125 VDC PSU option. If your cabinet stays below 60°C and you don’t have sensitive analog, the PAAA is sufficient and costs less.

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