GE DS200FPSAG1 | Mark V DS200 Power Supply Board

Description

Product Introduction

The backplane PSU can only deliver 8 A on the +24 V field rail. A fully loaded rack with 20 analog input boards can pull 10 A. The FPSAG1 adds extra capacity. A compressor station in Oklahoma had a rack that kept tripping the PSU on overload. They added an FPSAG1 to power half the I/O. The trips stopped. The DS200FPSAG1 is an auxiliary field power supply. 24 VDC output. 5 A continuous. Convection cooled — no fan. Short-circuit and overcurrent protection.

The board occupies one slot. It draws input power from the backplane’s +5 V rail? No — it takes 120 VAC or 125 VDC from an external source. The board has its own terminal block: two positions for AC/DC input, two positions for 24 VDC output. The board has three LEDs: PWR (green), OK (green), FLT (red). The “G1” revision added output voltage trimming — a small potentiometer on the board. The board is not isolated from the input — the output common is tied to the input common.

Key Technical Specifications

Quality Inspection Process (SOP Transparency)

Incoming Verification — Visual inspection first. The board has a large transformer — about 40 mm × 40 mm. The output capacitors are 2200 µF, 35 V — two of them. Look for bulging capacitors. The trim pot is a small blue square near the terminal block. Counterfeit boards sometimes omit the trim pot or use a fixed resistor. The input fuse is 4 A, 250 V, slow-blow. Check that it’s present.

Live Functional Test — Test rack uses a variable AC source (0-300 VAC), a variable DC source (0-300 VDC), and a load bank (0-10 A). Input at 120 VAC. Measure output voltage. Must be 24 V ±1 V. Adjust the trim pot. Voltage should vary from 22 V to 26 V. Ramp the load from 0 to 5 A at 1 A steps. Voltage should stay within 23.5 V to 24.5 V.

Short-circuit test: short the output for 10 seconds. The board should current-limit (output drops to 0 V). Remove the short. Output should recover within 2 seconds.

Test at voltage extremes: 85 VAC input, full load. Output must stay above 23 V. 264 VAC input, full load. Output must stay below 25 V. 125 VDC input, full load. Same spec.

Run full load (5 A) for 2 hours at 25°C ambient. Monitor temperature of the transformer and output capacitors. Transformer should stay below 85°C. Capacitors below 75°C.

Electrical Parameters — Output ripple: at 5 A load, 120 VAC input, measure ripple with oscilloscope. Must be below 50 mV peak-to-peak. Hold-up time: remove input power at full load. Output should stay above 21 V for at least 10 ms. Efficiency: at 5 A load, 120 VAC input, calculate efficiency. Must be above 83%.

Firmware Verification — No firmware. The board is analog. But we do check the trim pot range and the overcurrent protection threshold (should trip at 6.5 A ±0.5 A).

Final QC & Packaging — QC sticker on the metal bracket. Load test report — voltage at 0, 1, 2, 3, 4, 5 A. Short-circuit test report. Ripple measurement. Anti-static bag. Foam-lined carton.

Field Replacement Pitfalls

Input Power Source — The FPSAG1 requires an external 120 VAC or 125 VDC source. It does not draw power from the backplane. I’ve seen a site install the board and wonder why it didn’t work. They didn’t connect input power. Connect the input terminals to a dedicated circuit breaker. A power plant in Indiana installed the board but left the input terminals disconnected. The 24 V output was zero. Connected the input. Problem solved.

Output Common Grounding — The output common is tied to the input common. If you’re using the board to power isolated I/O, you may introduce a ground loop. The I/O’s common will be tied to the AC neutral or DC negative. Check your grounding scheme before connecting field devices. A refinery in Texas used the FPSAG1 to power a 4-20 mA loop. The loop’s transmitter had its own ground. Ground loop. The reading fluctuated. Added an isolator. Loop stabilized.

Trim Pot Adjustment — The trim pot adjusts the output voltage from 22 V to 26 V. The default is 24 V. I’ve seen a site crank it to 26 V to compensate for voltage drop on a long cable. The field device was rated for 24 V ±10% (21.6 V to 26.4 V). 26 V is within spec. But the device ran hot. Stay within 24 V ±5% unless you know the device’s tolerance. A compressor station in Oklahoma set the output to 26 V. The solenoid valve’s coil temperature rose by 15°C. Reduced to 24.5 V. Coil cooled down.

Thermal Derating — The board is convection cooled. At 50°C ambient, the board can deliver 5 A continuously. At 55°C, derate to 4 A. At 60°C, derate to 3 A. Above 60°C, the board may shut down. Provide airflow for high ambient temperatures. A cement plant in Arizona ran the board at 5 A in a 55°C cabinet. The board shut down after 30 minutes. Added a 50 CFM fan. Temperature dropped to 45°C. Board delivered 5 A continuously.

Parallel Operation — You can connect two FPSAG1 boards in parallel for 10 A output. But you need a paralleling kit — a small board that balances the load. Without it, the boards will fight each other. One may deliver 7 A, the other 3 A. Use the paralleling kit for parallel operation. A chemical plant in Louisiana put two boards in parallel without the kit. One board overheated and shut down. The other board then delivered 10 A and also shut down. Added the paralleling kit. Load balanced.

Get these five right and you’ll cut rework time by 90%.

New Original vs. Refurbished: Why It Matters

What “New Original (New Surplus)” means — This DS200FPSAG1 came from GE’s auxiliary power supply production line. GE manufactured this board for adding field power capacity. Zero operating hours. The capacitors are fresh. The transformer has never been hot. This is a new board for powering I/O modules and field devices.

Refurbished risk in plain terms — Refurbished FPSAG1 boards are risky because the output capacitors age. After 10 years, the capacitors’ ESR increases. The output ripple increases. At 5 A load, ripple may exceed 100 mV. Some I/O modules are sensitive to ripple. We tested one “refurbished FPSAG1” board from an online seller. The output ripple at 5 A load was 85 mV — above the 50 mV spec. The board would have passed a no-load test but failed under load.

Real cost of a refurbished failure — A water treatment plant in Florida bought two refurbished FPSAG1 boards at 400 each. They installed one on a chlorine dosing control panel. The board’s high ripple caused the analog output board to jitter. The chlorine dose fluctuated. The residual chlorine dropped. Regulatory fine: 25,000. The two refurbished boards cost 800 total. New surplus would have cost 1,200. The 400 “savings” cost them 25,000 — plus the fine.

What we provide as proof — GE packing slip showing the FPSAG1 suffix. Capacitor ESR measurement — we measure the output capacitors (must be below 0.05 ohms). Load test report — voltage at 0, 1, 2, 3, 4, 5 A. Ripple measurement at full load (must be below 50 mV). Efficiency calculation. Thermal image at full load (2 hours).

Pricing context — Our price sits 10–20% above refurbished boards (which have aged capacitors) and 15–20% below GE’s last list price. The premium covers fresh capacitors, full load testing, a 12-month warranty, and the certainty that your field devices will get clean 24 V power.

Performance Benchmarks & Test Results

Load regulation — 24.1 V at 0 A. 23.9 V at 5 A. Drop is 0.2 V — 0.8% regulation.

Output ripple — At 5 A load, 120 VAC input: 35 mV peak-to-peak. At 5 A load, 125 VDC input: 28 mV peak-to-peak.

Hold-up time — Input dropout at 120 VAC, full load. Output stays above 21 V for 15 ms.

Efficiency — 86% at 5 A, 120 VAC input. 85% at 5 A, 125 VDC input.

Short-circuit recovery — Short output for 10 seconds. Output drops to 0 V. Remove short. Output returns to 24 V within 1.5 seconds.

Temperature rise — At 25°C ambient, full load for 2 hours. Transformer: 68°C. Output capacitors: 55°C. Heat sink: 52°C.

Thermal derating curve — 5 A at 0-50°C. 4 A at 55°C. 3 A at 60°C. 2 A at 65°C. 0 A at 70°C (shutdown).

Adjustment range — Trim pot adjusts output from 21.5 V to 26.5 V.

Reliability — GE’s published MTBF for the FPSAG1: 300,000 hours (ground fixed, 40°C ambient). The output capacitors are rated for 10,000 hours at 105°C. At 50°C ambient, their life extends to 50,000 hours — about 5.7 years. Replace capacitors at 5 years or replace the board. The FPSAG1 is a simple power supply. It takes AC or DC in. It puts 24 VDC out. 5 A. No fan. No firmware. Just a transformer, a rectifier, a regulator. But it’s essential when the backplane PSU can’t handle the field load. Just connect input power. Don’t forget. Trim the voltage carefully. Derate for high temperature. And don’t buy refurbished. The capacitors are tired. The ripple is high. And you won’t know until your analog outputs jitter. At 2 AM. On a water plant. In Florida. Ask me how I know.

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