DS200ADCIH1A | Mark V High Density I/O | OEM Fast Shipping

Description

Product Introduction

The GE DS200ADCIH1A is a high-density analog interface board for the Mark V Speedtronic turbine control system. It provides 16 analog inputs and 8 analog outputs in a single VME slot. This module serves monitoring-heavy applications such as auxiliary system status (lube oil, cooling water, fuel gas pressure) in combined-cycle plants.

Core advantage: The H1A revision adds 400 Hz low-pass input filters to all 16 channels. The original H1 had 1 kHz filters, which passed electrical noise from variable frequency drives and switching power supplies. In field installations near VFDs, the H1 showed 2-3% reading fluctuations. The H1A filters cut that noise to below 0.2%. You also get improved common mode rejection (90 dB vs 80 dB). The trade-off is slightly slower update rate (200 ms vs 160 ms) – acceptable for monitoring.

Key Technical Specifications

Key Selling Points & Differentiators

• 400 Hz input filters kill VFD noise – Original H1 passed 2 kHz noise from variable frequency drives. H1A attenuates 2 kHz by 40 dB (100x reduction). Readings stable within 0.2% vs 3% fluctuation on H1.
• Higher common mode rejection – 90 dB at 60 Hz vs 80 dB on H1. Rejects ground loops from long field cable runs (up to 1,000 ft).
• 24 channels in one slot – 16 inputs, 8 outputs. Frees up VME slots for protection or comms modules.
• Drop-in replacement for H1 – Identical pinout and terminal block layout. Swap directly. No configuration changes needed. The filter change is transparent to the controller.
• Live tested with injected noise – Each board receives 5.000 V DC with 2 kHz, 1 V AC noise superimposed. Output must stay within ±0.02 V of expected value. H1 boards fail this test. H1A passes.
• 30-day warranty with cross-ship – Filter failure or channel drift? We send replacement same day.

Frequently Asked Questions (FAQ)

Q: What is the difference between DS200ADCIH1 and DS200ADCIH1A?
A: Input filter bandwidth and noise rejection. H1 has 1 kHz filters. H1A has 400 Hz filters. The H1A is specifically for sites with variable frequency drives (VFDs) on pumps or fans. The VFDs generate 2 kHz to 16 kHz switching noise that couples into analog signal cables. H1 passes that noise. H1A blocks it. If your plant has no VFDs, the H1 is fine and costs less. If you have VFDs within 50 ft of analog cables, buy the H1A.

Q: Can I replace an H1 with an H1A without changing my control logic?
A: Yes – the filter change affects only noise rejection, not scaling or timing. However, the slower update rate (200 ms vs 160 ms) may affect fast control loops. If you are monitoring tank levels or bearing temperatures, no issue. If you are monitoring fast pressure transients (e.g., compressor surge), the extra 40 ms delay may matter. In that case, keep the H1 or upgrade to 16-bit ADCIF series.

Q: How do you test the 400 Hz filter performance on refurbished boards?
A: We inject 5.000 V DC with 1 V AC at 2 kHz (simulated VFD noise) onto each input. Then we measure the output reading at the VME bus. The noise must attenuate to below 0.010 V AC (40 dB rejection). Any channel showing >0.020 V noise fails. We also test at 1 kHz (60 dB rejection required) and 500 Hz (20 dB rejection). About 10% of incoming H1A boards fail due to damaged filter capacitors – those are repaired or scrapped.

Q: The H1A spec shows 200 ms scan time for 16 inputs. Can I scan only 8 inputs for faster response?
A: No – the board scans all 16 inputs sequentially regardless of whether you use them. The mux runs a full cycle. To get faster response, you would need to move critical signals to a different board (ADCIF or ADCIG) and leave monitoring signals on the H1A. The Mark V controller cannot selectively disable channels to speed up scanning.

Q: I see an H1A board with a green dot near the terminal block. What does that mean?
A: The green dot indicates the board received an additional “filter alignment” test where we verify each channel’s -3 dB point is exactly 400 Hz ±10%. Standard boards are tested at 400 Hz ±20%. Green-dot boards have tighter tolerance and are intended for applications with precise frequency rejection requirements (e.g., turbines with multiple VFDs on the same bus). We charge an extra $15 for green-dot boards if available. Most applications do not need it.

Q: My H1A board reads 0.3 V low on inputs 1-8 but inputs 9-16 are fine. What failed?
A: The input buffer op-amp for the first bank (channels 1-8) has drifted. This is common on H1 and H1A boards – the op-amp (LM324) ages poorly in warm cabinets. Repair cost is $145. We replace both bank op-amps (channels 1-8 and 9-16) with upgraded LM324A (improved temp stability). Turnaround is 5 days. After repair, we re-calibrate all 16 channels.

Q: Can the H1A outputs drive a 4–20 mA loop with 24 V external supply?
A: The H1A outputs have internal 24 V loop power in current mode. Maximum loop resistance is 500 Ω. If you need longer loops (higher resistance), you can disable the internal supply (cut a jumper) and use an external 24 V supply. Provide up to 30 V external. The output transistor will regulate current up to 30 V. Do not exceed 30 V – the transistor will short. We can pre-configure boards for external supply upon request (no charge).

Q: Is this board compatible with the DS200TCPS terminal board?
A: No – the ADCIH1A uses standard terminal blocks, not ribbon cables. The TCPS series is for TGT (thermocouple) modules. Do not attempt to connect an ADCIH1A to a TCPS. The pinout is different, and you risk shorting the 24 V supply to ground. Use the included terminal blocks directly to field wires.

Q: How do I identify a counterfeit DS200ADCIH1A?
A: Genuine boards have “ADCIH1A” printed with a space after the “A” (ADCIH1A [space] REV 01). Counterfeits often print “ADCIH1A” without the space or with a different font. Also check the filter capacitors: genuine uses yellow WIMA film capacitors (10 nF, 5% tolerance). Fakes use generic ceramic capacitors (20% tolerance) – these do not provide the 400 Hz cutoff accurately. We photograph the filter caps on every board.

Q: Do you offer a conformal coated version of the H1A?
A: We can special-order the ADCIH1ACC (silicone coated) or ADCIH1ABB (acrylic coated). Lead time is 14-21 days because these are rare. The ACC version adds 95. The ABB adds 55. For coastal or high-humidity sites, we recommend the ABB (acrylic) for H1A – silicone coating is overkill for monitoring boards. However, we stock standard H1A (uncoated) for immediate shipment. Order coated versions in advance.

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