DS3815PABA1E1A | GE Mark VI IS200 DS3815 PSU | In Stock

Description

Product Introduction

The GE DS3815PABA1E1A is a power supply module for the Mark VI Speedtronic turbine control rack, configured for 24 VDC input with extended temperature capability. This IS200-series PSU converts a 24 VDC plant supply into the regulated voltages required by the CPU, I/O boards, and backplane. It’s designed for installations with only 24 VDC available and where ambient temperatures push beyond standard limits—outdoor cabinets, un-air-conditioned turbine decks, or desert environments.

The DS3815PABA1E1A 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 150W. The 1E1A suffix indicates a specific revision with enhanced input filtering and a wider operating temperature range—this variant uses higher-grade components rated for -40 to +75°C ambient, compared to the standard -40 to +70°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 PABA variants. This matters in un-conditioned enclosures, turbine decks, or outdoor cabinets where summer temperatures push past 65°C. The 1E1A uses 105°C-rated capacitors and higher-grade switching transistors to handle the extra thermal stress.
• Enhanced Input EMI Filtering: The 1E revision includes additional filtering components on the 24V input—common-mode chokes and differential capacitors. Protects against conducted noise from VFDs, solenoids, and other inductive loads sharing the same DC bus.
• 24 VDC Input Compatibility: Direct solution for plants with 24 VDC control power already distributed. No step-up transformer or separate 125 VDC supply needed. Reduces installation cost and cabinet complexity.
• 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 24V field loop output is independently regulated, not just passed 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 150W 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 DS3815PABA1A1B and DS3815PABA1E1A?

Temperature rating and component selection. The 1A1B has standard -40 to +70°C operation with enhanced filtering. The 1E1A has the same filtering but 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 1E1A gives you a 7°C margin vs. the standard unit running right at its limit. We’ve seen standard PABA boards shut down at +72°C; the 1E1A keeps running.

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

It depends on your total load. The PABA1E1A delivers 150W total. A fully populated rack with CPU, multiple analog I/O, thermocouple boards, relay outputs, and redundant communications can draw 180-200W. In that scenario, the PSU will overload and eventually trip. We’ve seen customers run 12-slot racks successfully with this PSU. Calculate your backplane load using the individual module power specs from the IS200 series datasheet. Leave a 20% margin—don’t exceed 120W continuous for reliable operation, especially at elevated temperatures where derating applies.

Q: How does the temperature derating work?

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 112W continuous. If your rack draws 130W and your cabinet runs at 70°C, the standard PABA would be overloaded. The 1E1A will still deliver, but you’re running close to the limit. For high-temperature installations, we recommend calculating your actual load and ensuring you have adequate cabinet ventilation. No power supply can deliver full rated load at 75°C indefinitely.

Q: What’s the correct polarity for the 24 VDC input?

The input terminals are labeled “+” and “−” on the front panel. Polarity matters—reverse polarity will trigger the internal protection diode, but it will not damage the PSU. The board will simply not power up. Correct the polarity and it will start normally. That said, repeated reverse polarity events can stress the protection circuit, so double-check before applying power.

Q: My current DS3815PABA is from 2005 and runs hot. Should I upgrade to the 1E1A?

If your cabinet regularly runs above 65°C, yes. The 1E1A is explicitly designed for that condition. But before you buy, check your cabinet temperature log—many plants think they have a heat problem when it’s actually just 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 1E1A is the right call. If it’s below 60°C, the standard PABA or 1A1B will serve you fine and cost less.

Q: Can I hot-swap this PSU with the rack powered on?

Not recommended. The backplane connector is designed for live insertion, but the 48V output can spike during insertion. We’ve seen the CPU lock up even on redundant PSU configurations. The correct procedure: power down the rack, swap the PSU, then power up. If you’re running redundant PSUs and one fails, you can swap the failed unit with the rack powered on—the online PSU will carry the load. For single PSU installations, never hot-swap.

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 150W (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 1E1A 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 PABA1E1A 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 24 VDC DIN-rail power supply instead of this board?

No. The DS3815PABA1E1A 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 very hot environment—should I consider two PSUs in redundant configuration?

Yes, but not for the reason you think. Redundancy protects against a single PSU failure, not temperature. Two PABA1E1A units in parallel with active current sharing will each run at 50% load, which reduces internal heating and extends component life. At 75°C ambient, a single PSU running at 80% load will have a significantly shorter life than two PSUs each running at 40% load. We can supply matched pairs tested for current sharing. It’s a higher upfront cost, but in extreme environments, it pays for itself in reliability.

NI SCXI-1104C
ABB DSQC679
A-B 2711P-T15C4D2
HONEYWELL 05701-A-0550