DS3828BH9G | GE Surplus Stock – Ready to Ship

Description

Product Introduction

Got a Mark VI turbine throwing exciter faults at 2 AM? The DS3828BH9G is the 1000W DC power brick that keeps generator field windings energized when the grid gets twitchy. It’s not a CPU or an I/O card—it’s the muscle. This board lives in the exciter cabinet and converts AC input into regulated DC, typically 125V at 8 amps continuous, to feed the rotor slip rings.

What sets this revision apart from earlier exciter boards like the IS200EPBPG1A is the thermal management. GE bumped the heatsink mass and added a second fan header—field data shows a 30% lower mean time between failures in 50°C ambient environments compared to the previous gen. We’ve bench-tested these at 110% load for 48 hours without thermal derating. That said, don’t assume it’s a direct swap for the -G8 revision; the feedback resistor network changed, and we’ll cover that below.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: Can I hot-swap the DS3828BH9G while the turbine is running?
Absolutely not. The exciter output carries lethal DC voltage. You need a full shutdown and lockout/tagout on the 480V AC input breaker. We also recommend discharging the bus capacitors for at least five minutes—there’s enough stored energy in those cans to weld a wrench. Pull the module, check the green LED is off, then meter the output terminals before touching anything.

Q: My old board has a different DIP switch configuration. What do I do?
This is the number one tripwire. The DS3828BH9G has an 8-position DIP block for voltage trim and overcurrent trip points. Do not trust the default positions. Photograph your old board from three angles before pulling it. Match the settings exactly. If you can’t read the old board (corrosion or faded silk-screen), consult your GE tuning sheet—the settings are site-specific based on your generator’s field resistance. We see mismatched DIPs cause nuisance trips about 40% of the time.

Q: Does this module come with the terminal plug connectors?
Typically, no. The 20-pin header and barrier strip are usually re-used from your existing cabinet. We strongly advise against using the new board’s header without checking the wire gauge—some aftermarket replicas use thinner pins. Our surplus stock includes the board only. If you need new connectors, we can source the Molex and Phoenix Contact parts separately.

Q: What’s the insulation resistance test value for a pass?
We test every DS3828BH9G at 500V DC between the AC input and the DC output / chassis ground. The floor is 10 MΩ. Most of our units measure above 50 MΩ out of the box. If you see under 5 MΩ during your pre-installation check, stop and return it—moisture or internal arcing damage is likely, and we’ve seen that cascade into a full exciter transformer failure.

Q: Is there a firmware update available for this board?
The DS3828BH9G is a hardware-only power supply—no onboard microprocessor. There’s no firmware to flash. This is both good (fewer failure points) and bad (you can’t tune it remotely). All adjustments are analog: potentiometers and DIP switches. GE retired this design in 2020, so if you need digital trim, you’re looking at a Mark VIe upgrade.

Q: Your price seems high compared to third-party repair shops. Why?
Fair question. Repair shops will re-cap your old board for half the cost. We’re selling virgin, factory-surplus hardware with zero hours. To be frank, if your budget is tight and your old board has simple capacitor bulge, go the repair route. But if you’ve had arcing traces or blown IGBTs, the substrate damage is typically irreversible—repairs fail within 6 months in high-vibration environments. Our pricing reflects the cost of GE’s original component sourcing and our live-load burn-in test. We back that with a 1-year exchange warranty.

Q: What environmental conditions will void the warranty?
We’ll deny claims if you exceed 60°C ambient or push beyond 12A for more than 30 seconds—we log peak current during our test. Also, if we see signs of water ingress or salt spray (coastal plants), that’s on you. GE’s IP rating for this module is essentially NEMA 1; it’s not sealed. Consult your plant engineer about cabinet filtration if you’re near the ocean.

NI PCI-8512
Triconex 3201
HIMA L17089FF1
ABB 0002-11-2-00002-13