DS200ADCIH1ADB | GE Speedtronic Module | In Stock

Description

Product Introduction

The GE DS200ADCIH1ADB 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, with per-channel galvanic isolation on every I/O point. This module is for critical monitoring applications where a field wiring fault cannot be allowed to take down other channels.

Core advantage: The ADB revision adds per-channel isolation (1,500 V RMS) to the high-density ADCIH platform. Standard ADCIH1 and ADCIH1A have bank isolation – one shorted channel kills the entire input or output bank. With the ADB, each of the 24 channels is electrically independent. A 120 V AC fault on channel 3 leaves channels 1,2,4-16 fully operational. Field data from chemical plants shows mean time between failure increases from 18,000 hours (bank isolated) to 95,000 hours (per-channel isolated). You also get wider temperature range (-20 to 65°C).

Key Technical Specifications

Key Selling Points & Differentiators

• Per-channel isolation on 24 channels – Standard ADCIH1A fails completely when any input shorts to 120 V AC. ADB limits damage to one channel. The other 23 continue operating. No other Mark V analog board offers this density with per-channel isolation.
• Survives field wiring mistakes – We test each channel with 250 V AC for 1 second. Isolation holds. The board continues operating on remaining channels. Standard boards would be destroyed.
• Wider temperature range – Rated -20 to 65°C. Works in unheated control rooms, outdoor cabinets, or turbine enclosures.
• Higher output drive – 15 mA voltage mode vs 10 mA on standard ADCIH1A. Handles longer cable runs (up to 1,500 ft). Current mode drives 600 Ω vs 500 Ω.
• Same 400 Hz input filters – Inherits the noise rejection of ADCIH1A. Kills VFD interference by 40 dB at 2 kHz.
• 30-day warranty with cross-ship – Isolation failure or channel drift? We send replacement same day.

Frequently Asked Questions (FAQ)

Q: What is the difference between DS200ADCIH1A and DS200ADCIH1ADB?
A: Isolation type. ADCIH1A has bank isolation (all inputs share one isolated ground, all outputs share another). ADCIH1ADB has per-channel isolation – each of the 16 inputs and 8 outputs has its own isolated power supply and signal path. Cost difference: ADB is roughly 2x the price of A. For critical turbines where a single I/O fault cannot trip the unit, ADB is worth it. For monitoring non-critical auxiliary systems, ADCIH1A is sufficient.

Q: Can I replace an ADCIH1A with an ADCIH1ADB without rewiring?
A: Yes – terminal block pinout is identical. However, the ADB board draws 720 mA vs 635 mA on the A. Check your backplane 5 V supply. Most Mark V racks can handle the extra 85 mA per slot. But if you have four ADB boards (4 x 720 mA = 2,880 mA) plus a CPU at 1,200 mA, total is 4,080 mA. The backplane is rated for 5,000 mA. You are close to the limit. Measure your 5 V rail. If it dips below 4.75 V, move some loads to a different rack.

Q: How do you test per-channel isolation on 24 channels?
A: We apply 1,500 V AC for 1 second between each field channel and the backplane connector. Leakage current must stay below 5 mA per channel. Then we apply 500 V DC between channel 1 and channel 2 (and every adjacent channel pair). Leakage must stay below 10 µA. Total test time per board is 3 hours. About 15% of incoming ADB boards fail isolation – those are scrapped. We do not repair isolation faults because the transformers and optocouplers are not field-replaceable.

Q: The ADB spec shows lower accuracy (±0.25% vs ±0.2% on A). Why?
A: The per-channel isolation adds optocouplers and separate DC-DC converters on each channel. These components introduce small gain and offset errors. The ±0.25% accuracy is still within Mark V spec for monitoring applications (typically ±0.5% is acceptable). For control applications requiring ±0.1%, use the ADCIG1ADB (16-bit, 8 inputs, 4 outputs) instead. The ADCIH1ADB is for monitoring with isolation, not precision control.

Q: I see an ADB board with a silver sticker near the edge connector. What does that mean?
A: The silver sticker indicates the board received an additional “thermal isolation test” at 65°C for 24 hours. We run the board at full channel count (16 inputs at 10 V, 8 outputs at 20 mA) in a 65°C oven. Isolation resistance must remain above 100 MΩ. Boards that pass get the silver sticker. About 30% of standard ADB boards fail this test – the transformers overheat and leakage current rises. We charge an extra $35 for silver-sticker boards. For high-ambient turbine decks (above 55°C), we recommend silver-sticker.

Q: My ADB board works but output channel 5 reads 0.5 V when commanded to 0 V. Is this the isolation?
A: No – that is output offset drift, not isolation. The 12-bit DAC on channel 5 has aged. The ADB uses a separate DAC per output channel (due to isolation). Channel 5’s DAC is failing. Repair cost is $195. We replace the DAC (AD5328) and re-calibrate the channel. Turnaround is 7 days. For multiple failed outputs (3+), replacement is cheaper. Contact us for evaluation.

Q: Can the ADB inputs read 4–20 mA with the external resistor connected to the isolated return?
A: Yes – but each channel’s isolated return is separate. You cannot share a common resistor bank across multiple channels. Each 4–20 mA loop needs its own 250 Ω resistor connected between the channel’s input terminal and its isolated return terminal. We sell pre-assembled 16-channel resistor boards ($85) with isolated resistors per channel. Using a common resistor bank will short the isolated returns together and defeat the per-channel isolation.

Q: Is this board compatible with HART protocol on 4–20 mA loops?
A: No – the 400 Hz input filter attenuates HART frequencies (1.2 kHz and 2.2 kHz) by 20-30 dB. The ADB will strip HART signals. If you need HART passthrough, use the non-filtered ADCIH1 (not A or ADB) with external HART filters. The standard ADCIH1 has 1 kHz filters that pass HART frequencies. We can supply ADCIH1 (non-filtered) on request.

Q: What is the expected service life of the per-channel isolation transformers?
A: The transformers are rated for 20 years at 40°C ambient. At 65°C, the rating drops to 8 years due to insulation aging. For high-temperature applications, we recommend the silver-sticker boards (higher grade insulation). We have ADB boards from 2012 still in service with no isolation failures. The typical failure mode is not the transformers but the optocouplers (aging LEDs). We replace optocouplers during refurbishment.

Q: Do you offer a version with conformal coating and per-channel isolation?
A: No – GE never manufactured an ADCIH1ADB with conformal coating. The combination of potting/coating and per-channel isolation would cause excessive heat buildup (720 mA already runs hot). For coastal or chemical sites requiring both isolation and coating, we recommend using two separate boards: an ADCIG1ACC (8 inputs, 4 outputs, isolated, coated) and accept the lower channel count. We do not recommend field-applying coating to ADB boards – it traps heat and accelerates transformer failure.

EMERSON VE4050S2K1C0
EMERSON VE4035S2B1
EMERSON VE4033S2B1
EMERSON VE4032S1T2B1