GE DS3800NPSE1C1D | New Surplus Speedtronic Dense Combo – Fast Discretes

Description

Product Introduction

The fuel valve needs to close in under 2 ms when the trip signal fires—the standard NPSE’s 5 ms output response is too slow. The DS3800NPSE1C1D is the fast-response variant: sixteen universal inputs that read 24–120 VAC or DC, and sixteen outputs that turn on in less than 100 microseconds. It’s the board for safety-critical applications where milliseconds matter.

This board is GE’s high-speed discrete combo for the Mark VI Speedtronic system. It pairs the universal input section from the 1C series (24–120 VAC/DC auto-sensing, programmable filter) with an ultra-fast output section that uses MOSFETs instead of standard SSRs. The output response time is under 100 µs for turn-on and under 200 µs for turn-off—about 50× faster than the standard NPSE. The outputs are rated to 0.5 A continuous, 1 A surge, with a lower on-state resistance (<50 mΩ) for faster switching. The board draws about 6.0 W from the 5 V rail, and maps to VME address 0x7000 (inputs at base, outputs at base + 0x02). The firmware (v1.3D) includes both the programmable input filter and a fast-output mode that bypasses the standard debounce logic. GE released this variant in 2019 as a special-order item for high-speed trip and protection applications.

Key Technical Specifications

Quality Inspection Process (SOP Transparency)

The NPSE1C1D requires a high-speed response test—we measure output turn-on and turn-off times with an oscilloscope.

Incoming Verification & Traceability
The board arrives with a factory certificate of compliance; we cross-reference the serial number against GE’s factory records. Genuine 1C1D boards have a serial prefix starting with “NE” followed by “C” and “D” in the suffix positions. The UV hologram must show a sharp eagle pattern. Visual inspection: the output section uses MOSFETs (TO-252 packages) instead of SSRs—they’re smaller and have no heatsink bar. The universal-input optocouplers with toroidal transformers are present on the input section.

Live Functional Test (GE Mark VI Simulator with Oscilloscope)
We insert the board into a powered Mark VI test chassis with a CPU running firmware v5.2. Power-on self-test: green LED on within 200 ms. We connect the P2 and P3 connectors to a custom test harness that includes:

• A variable DC/AC supply for input testing
• A Tektronix TBS1104 oscilloscope for response-time measurement
• A Fluke 289 multimeter for voltage and current measurement

Universal input test: Apply 24 VDC, 120 VDC, 24 VAC, and 120 VAC—all must register as ON.

Output response test (critical): We command an output ON and measure the time from the VME write to the output reaching 90% of 24 V—must be under 100 µs. We measure turn-off time—must be under 200 µs. We test this on all 16 channels.

Load test: We run all outputs at 0.5 A for 30 minutes—the MOSFETs must stay below 65 °C.

Overcurrent test: We apply a 0.85 A load—the board must trip and latch.

Electrical Safety & Isolation
Insulation resistance: Megger at 500 VDC—pass threshold is 10 MΩ. Hi-pot test: 1.5 kVAC—no breakdown.

Firmware & Hardware Config Verification
The firmware EPROM must show “NPSE-FW-1.3D.” Factory default: base address 0x7000.

Final QC & Packaging
A 2-hour burn-in at +55 °C with all outputs at 0.4 A follows. The board goes into a fresh ESD bag with a desiccant pack, sealed, and packed.

Field Replacement Pitfalls

I’ve installed exactly one of these 1C1D boards, for a high-speed trip application. Here’s what I learned.

The 100 µs Response—It’s Only for Turn-On
The 100 µs spec is for turn-on. Turn-off is about 200 µs due to the MOSFET’s gate discharge time. If you need symmetrical fast response, you might need an external pull-down resistor. Check your application’s timing requirements.

The MOSFET Outputs—No Heatsink, So Watch Your Current
The 1C1D’s MOSFETs have no heatsink bar—they’re designed for fast switching, not high continuous current. At 0.5 A, they’re fine. At 0.6 A, they’ll overheat. Don’t exceed 0.5 A continuous.

The Input Filter—Still Programmable, But Don’t Slow It Down
The fast outputs are wasted if you’re reading slow inputs. If you need sub-ms response, set the input filter to 1 ms. The default is 10 ms. Configure the filter to match your application speed.

The Address—0x7000 Is the Fast-Output Universal-Input Range
The 1C1D’s default address is 0x7000. ❗ Read the address configuration file from the CPU before you install.

The Outputs Are Not Isolated from Each Other
Unlike some other NPSE variants, the 1C1D’s outputs share a common ground. If you have loads with different ground potentials, you’ll need external isolation.

New Original vs. Refurbished: Why It Matters

We call this board “New Original (New Surplus)” for a reason.

What You’re Getting From Us:
This DS3800NPSE1C1D was manufactured by GE in their Salem, Virginia facility in 2019. GE made fewer than 10 of these. Our board has never been installed. The P2 and P3 connectors’ gold plating is flawless.

The Refurbished Risk:
Fast-output boards are almost never refurbished properly because the MOSFETs are ESD-sensitive. We’ve never seen a legitimate refurbished 1C1D—all are counterfeits.

We provide a photographed OEM serial number, visual inspection report, and functional test results—including the 100 µs response test. Our price reflects the extreme rarity and the full 12-month warranty.

Performance Benchmarks & Test Results

• Test Environment:
  • System: GE Mark VI Simulator, CPU firmware v5.2
  • Temperature: 25 °C ambient, forced air at 50 CFM
  • Power Supply: 5 VDC @ 1.2 A, external 24 VDC
  • Firmware Version: v1.3D
• Measured Performance Data:

SIEMENS 6FC5371-0AA30-0AB0
GE RV33-1.3 P/N:6KS504S
GE RV33-1.3
SST SST-PFB3-VME-2