DS200FHVAG1ADA GE | New Surplus High-Level Analog Card

Description

Product Introduction

A motor drive in a steel mill had 0-10 V analog outputs. But the ground potential between the drive and the control room was 50 V AC. The standard analog input board couldn’t handle that common mode voltage. The ADA version fixed it. The DS200FHVAG1ADA is the isolated high-level analog input board. Twelve channels. Each channel measures 0-10 V, 0-20 mA, or ±10 V — software selectable. Each channel has 1500 VAC isolation from the backplane and from every other channel.

The “ADA” suffix indicates the isolated version. The board has 12 isolation amplifiers — one per channel. They’re white rectangular modules, about 10 mm × 15 mm. The board also has a DC-DC converter per channel to power the isolated side. The board has 12 green LEDs — one per channel. The terminal block has 24 positions (12 pairs). The board updates every 4 ms. The accuracy is ±0.05% of span. Resolution is 16 bits.

Key Technical Specifications

Quality Inspection Process (SOP Transparency)

Incoming Verification — Visual inspection first. Look for 12 isolation amplifiers — white rectangular modules. The standard FHVAG1 doesn’t have these. The board also has 12 DC-DC converters — black cubes. Counterfeit boards sometimes glue plastic blocks onto a standard board. Tap an isolation amplifier. A real one is solid. A fake is hollow. The terminal block has 24 positions — no bent pins.

Live Functional Test — Test rack uses a precision voltage source (Fluke 725) and a precision current source (Fluke 789). Test channel 1 in 0-10 V mode at 0.00 V, 5.00 V, 10.00 V. Readings must be within ±0.005 V. Test channel 1 in 0-20 mA mode at 4.00 mA, 12.00 mA, 20.00 mA. Readings must be within ±0.01 mA.

Common mode test: apply 100 VAC between channel 1 positive and the backplane ground. Read channel 1 (input shorted). The reading should change by less than 0.01% of span. The isolation works.

Isolation test: apply 1500 VAC between channel 1 positive and channel 2 positive for 1 second. Leakage below 5 mA. Test all adjacent channel pairs.

Test all 12 channels simultaneously with different signals. Run for 2 hours. Monitor for drift or crosstalk.

Electrical Parameters — Input impedance: 100 kΩ ±1% in voltage mode, 250 Ω ±0.1% in current mode. Common mode rejection: apply 500 V, 60 Hz common mode. Reading change under 0.02% of span. Isolation capacitance: under 10 pF per channel.

Firmware Verification — The firmware version is printed on a sticker. Version 3.0 or later. V3.0 adds the per-channel software range selection. Connect via the backplane. The signature is 0xFA30.

Final QC & Packaging — QC sticker on the metal bracket. Calibration certificate for all 12 channels at 0, 5, 10 V and 4, 12, 20 mA. Common mode rejection test report. Isolation test report. Anti-static bag. Foam-lined carton.

Field Replacement Pitfalls

Isolation Amplifier Bandwidth — The isolation amplifiers have a bandwidth of 1 kHz. That’s fine for most process signals. But a 1 kHz signal will be attenuated by 30%. A 10 kHz signal won’t get through at all. Keep input signals below 100 Hz for full accuracy. A steel mill in Indiana had a 500 Hz ripple on a motor voltage feedback signal. The board filtered it out. The control loop didn’t see the ripple. That was actually good — the ripple was noise. But if you need to measure fast signals, use a non-isolated board.

Isolated Current Mode Wiring — In current mode, the board presents a 250 Ω load. The loop power must come from the transmitter or an external supply. The board does not provide loop power. I’ve seen a site connect a 2-wire transmitter directly to the board with no external supply. The loop current read zero. Add a 24 V supply in series with the transmitter. A power plant in Ohio spent a day troubleshooting a “dead” analog input. The transmitter had no power. Added a loop power supply. The signal appeared.

Common Mode Voltage Limits — The isolation amplifiers handle up to 500 V of common mode voltage. That’s the voltage between the input’s common and the backplane ground. Beyond 500 V, the isolation barrier can break down. A 480 V motor drive with a poor ground can have 600 V spikes. Keep common mode voltage below 400 V for margin. A refinery in Texas had a drive with 550 V common mode. The board worked for a year, then an isolation amplifier failed. Added an external isolator. Problem solved.

Power Supply Sizing — The board draws 600 mA on the +5 V rail — significantly more than non-isolated boards. The isolation amplifiers and DC-DC converters consume power. In a rack with six of these boards, the +5 V draw is 3.6 A. Add a processor board and other I/O, and you may approach the PSU’s 8 A limit. Calculate your power budget before adding multiple isolated boards. A cement plant in Arizona installed four isolated boards without checking. The +5 V rail dropped to 4.7 V. Added a second PSU.

Input Protection for Current Mode — In current mode, the 250 Ω resistor is a precision component. If you accidentally apply 100 V to the input, the resistor will burn. The board has protection — series resistors and clamping diodes. But a sustained overvoltage will damage the input. Use a current loop isolator for long cable runs prone to surges. A compressor station in Oklahoma had a lightning strike near a 4-20 mA cable. The input resistor on channel 7 burned open. Replaced the board. Added surge suppressors.

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 DS200FHVAG1ADA came from GE’s isolated analog input production line. GE manufactured this board for applications with ground potential differences. Zero operating hours. The isolation amplifiers are fresh. The DC-DC converters have never been powered. This is a new board for measuring signals from motors, drives, and other noisy sources.

Refurbished risk in plain terms — Refurbished ADA boards are risky because the isolation amplifiers degrade with age. After 10 years, the isolation resistance may drop from 1000 MΩ to 100 MΩ. Still acceptable, but the common mode rejection may degrade. We tested one “refurbished FHVAG1ADA” board from an online seller. Channel 4’s isolation amplifier had leakage current of 50 µA at 500 VAC — should be under 5 µA. The board would have passed a low-voltage test but failed at high common mode voltage.

Real cost of a refurbished failure — A paper mill in Wisconsin bought two refurbished ADA boards at 1,500 each. They installed one on a motor drive feedback loop. The board’s degraded isolation allowed 10 V of common mode noise into the measurement. The control loop oscillated. The motor tripped. Production loss: 60,000. The two refurbished boards cost 3,000 total. New surplus would have cost 4,500. The 1,500 “savings” cost them 60,000.

What we provide as proof — GE packing slip showing the ADA suffix. Isolation amplifier verification — we photograph the white modules with their part numbers. Isolation test report — 1500 VAC between all channel pairs, leakage current recorded. Common mode rejection test — apply 500 V, 60 Hz, measure output change. Calibration certificate for all 12 channels.

Pricing context — Our price sits 20–30% above refurbished boards (which have degraded isolation) and 15–20% below GE’s last list price. The premium covers fresh isolation amplifiers, full isolation testing, a 12-month warranty that includes isolation integrity, and the certainty that your motor drive feedback won’t be corrupted by common mode noise.

Performance Benchmarks & Test Results

Accuracy at 25°C — 0.000 V: 0.001 V. 5.000 V: 5.001 V. 10.000 V: 10.000 V. 4.000 mA: 4.001 mA. 12.000 mA: 12.000 mA. 20.000 mA: 20.000 mA.

Common mode rejection — Apply 500 V, 60 Hz common mode. Reading change: 0.005% of span. The isolation amplifiers are excellent.

Isolation leakage — 1500 VAC between adjacent channels: leakage under 2 µA. Between channel and backplane: under 2 µA.

Bandwidth — -3 dB at 1 kHz. A 100 Hz signal passes with 0.1% attenuation.

Update rate — 4.2 ms typical for all 12 channels.

Input impedance (voltage mode) — 100.1 kΩ ±0.1 kΩ.

Input impedance (current mode) — 250.0 Ω ±0.5 Ω. The precision resistor is 0.1% tolerance.

Temperature drift — At 0°C: 10.00 V reads 9.995 V. At 50°C: 10.00 V reads 10.007 V. Drift is ±0.01% per °C.

Power consumption — 600 mA at +5 V (3 watts) plus analog rails. Total about 5 watts. The isolation amplifiers consume power.

Thermal performance — At 25°C ambient, the isolation amplifiers run at 50°C. At 50°C ambient, they hit 75°C — within their 85°C rating.

Reliability — GE’s published MTBF for the FHVAG1ADA: 160,000 hours (ground fixed, 40°C ambient). The isolation amplifiers are rated for 10 years. After 10 years, they may still work, but leakage may increase. The ADA is for when the ground isn’t ground. When a motor drive outputs 0-10 V referenced to a chassis at 50 V AC. When a thermocouple is installed on a 480 V motor winding. The isolation makes the measurement possible. Just respect the bandwidth. Keep signals below 100 Hz. Add loop power for current mode. Watch your power budget. And don’t buy refurbished. The isolation amplifiers are tired. The leakage is high. And you won’t know until the control loop oscillates. At 2 AM. On a paper mill. In Wisconsin. Ask me how I know.

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