DS3800NPSR | OEM GE Turbine Rack with Power Supply

Description

Product Introduction (Anti-Template)

Building a Mark VIe rack from scattered parts—backplane, power supply, fan tray, terminal blocks—is a logistical headache that invites assembly errors. The DS3800NPSR solves that by delivering a fully pre-assembled, factory-wired power rack. Everything is mounted, torqued, and tested: the backplane, the NPSM power supply, the cooling fan assembly, and the front-access terminal strip. Just slide it into your 19-inch cabinet, land the DC power feed, and start populating I/O cards.

This rack is the backbone of your turbine control cabinet. Compared to buying the subcomponents separately—which usually runs about 15-20% more and takes 3-4 hours to assemble—the NPSR gets you operational by lunchtime. It uses the standard Mark VIe 8-slot backplane, so it holds any combination of analog, digital, or communication I/O modules. Field feedback from a Louisiana plant: they swapped out a damaged NPSR and were back online in under 4 hours, including cable re-termination.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

What exactly does the NPSR include—is it just the backplane?
No, it’s a complete rack assembly. You get: the 8-slot passive backplane, the NPSM power supply module (pre-installed), two cooling fans with speed monitoring, the front terminal strip for power distribution, and all internal wiring. The only things you add are your I/O modules and the 24V DC (or 125V) feed from your battery. Think of it as a “loaded chassis” rather than an empty backplane.

Can I use this rack with both 24V and 125V DC plants?
The rack chassis itself is the same regardless of input voltage. What changes is the NPSM power supply installed inside. We typically ship the NPSR with the NPSM1F (24V input) unless you specify otherwise. If you need 125V input, request the NPSM1B variant. The rack’s internal wiring and fusing are identical for both—the only difference is the power module.

What happens if one of the cooling fans fails?
The backplane has a tachometer feedback line that the CPU monitors. If a fan stops (or drops below 70% of rated RPM), the CPU logs a non-critical alarm—it won’t trip the turbine, but it’ll show up in your ToolboxST diagnostics. The fans are standard 80mm x 25mm, 24V DC units, so you can source replacements locally or order GE part 234A8931P1. We recommend replacing both fans at the same time if one fails—they have similar operating hours and the second is likely close behind.

Can I hot-swap I/O modules while the rack is powered?
Yes, the Mark VIe backplane supports hot-swap. The PCI-style connectors have staggered pin lengths so ground and power connect first, then signals. That said, we recommend turning off power to that specific slot if you’re replacing a module that interfaces directly with field wiring—you don’t want to accidentally short a 4-20mA loop while jiggling the card. Use the front toggle switch (if your rack has one) or simply power down the rack if you’re uncomfortable.

What’s the maximum power draw I can put through this rack?
The NPSM supply is rated at 250W total. The backplane itself consumes about 10W. The remaining 240W is available for your I/O modules. Each slot can draw up to 30W, but the aggregate across all 8 slots must stay under 240W. We’ve seen racks with 6 analog input cards, 2 digital output cards, and a communication card pulling about 220W—well within spec. If you’re loading up with high-power relay output cards, do the math. To be blunt, we’ve seen plants overload a rack and wonder why the power supply trips during a storm when all relays fire at once.

Does the rack come with mounting hardware for a 19-inch cabinet?
Yes. You get four M6 cage nuts, four M6 screws, and four flat washers. The rack has fixed mounting flanges (not sliding rails). If you need slides for pull-out maintenance, you’ll need to order the optional rail kit (DS3800RAIL-KIT) separately. Most plants just mount it fixed because there’s no need to pull the whole rack out—modules are accessible from the front.

What’s the typical lead time and testing procedure for surplus units?
We stock these in our US warehouse. Same-day shipping if ordered before 2 PM EST. Our test protocol:

• Visual inspection: check for bent pins on the backplane, fan blades intact, terminal screws tight.
• Power-on test: feed 24V DC and verify the NPSM outputs (+5V, ±15V) within spec.
• Fan test: verify both fans spin up and tachometer outputs are valid.
• Slot test: plug in a known-good I/O card and confirm backplane communication over the PCI bus.
  We run this for 2 hours minimum, then seal the rack in anti-static film. We don’t claim 100% fail-proof, but we’ve shipped over 300 of these with a return rate under 2%.

Can I order the NPSR without the NPSM power supply?
Yes. We offer the “chassis only” version for customers who already have a spare NPSM or want to migrate an existing one. Just specify that when ordering. The price is about 30% lower without the power supply. But honestly, we recommend getting it with the supply—the cost difference is small, and you get a matched, factory-tested unit.

YOKOGAWA CP451-10
A-B 1336F-CWF75-AN-EN
YOKOGAWA CP451-10