DS200DMCAG2AGC | GE Speedtronic Module | In Stock

Description

Product Introduction

The GE DS200DMCAG2AGC is a high-density analog combination I/O module for the Mark V Speedtronic turbine control system. It provides 8 analog inputs and 8 analog outputs in a single VME slot – double the density of the DMCAG1 series (4 in / 4 out). This module includes extended temperature operation (-20 to 65°C) and silicone conformal coating for harsh environments.

Core advantage: The G2AGC revision packs 16 analog I/O points into one slot, replacing two DMCAG1 boards. For large turbines with many analog loops (e.g., 16 fuel valve positioners with feedback), this board reduces VME rack space by 50%. The silicone coating resists H2S and fuel vapors for refinery use. Field data from large combined-cycle plants shows this board reduces analog I/O module count by 50%.

Key Technical Specifications

Key Selling Points & Differentiators

• 8 inputs + 8 outputs in one slot – Double density of DMCAG1 (4 in / 4 out). Replaces two DMCAG1 boards. Saves VME rack space.
• Silicone coating for chemical plants – Resists H2S, fuel vapors, solvents. For refinery and petrochemical applications.
• Extended temperature -20 to 65°C – For outdoor and unheated enclosures.
• Same 16-bit input / 14-bit output resolution – No reduction in precision for higher density.
• Three terminal blocks for organized wiring – 6 I/O points per block (mixed I/O). Color-coded.
• Live tested with 8-channel closed-loop simulation – All 8 loops running simultaneously. No cross-channel interference.
• 30-day warranty with cross-ship – I/O failure? We send replacement same day.

Frequently Asked Questions (FAQ)

Q: What is the difference between DS200DMCAG1AHC (4 in / 4 out, high drive) and DS200DMCAG2AGC (8 in / 8 out, standard drive)?
A: Channel density and output drive. DMCAG1AHC: 4 in / 4 out, 50 mA/1,200 Ω drive, silicone coated, extended temp. DMCAG2AGC: 8 in / 8 out, standard drive (10 mA/600 Ω), silicone coated, extended temp. For high channel count with standard drive, use G2AGC. For high drive requirements, use two G1AHC boards (4 channels each).

Q: Can I replace two DMCAG1 boards with one G2AGC board?
A: Yes – wiring is different (G2AGC has 8 inputs and 8 outputs on three terminal blocks). You must rewire both DMCAG1 boards into the G2AGC terminal blocks. Budget 4-5 hours. The G2AGC draws more current (680 mA vs 2 x 450 mA = 900 mA for two DMCAG1) – actually less current per slot but total current is lower.

Q: How do you test 8 inputs and 8 outputs simultaneously on refurbished boards?
A: We apply precision voltages to all 8 inputs (0 V, 5 V, 10 V) and command all 8 outputs to 0 V, 5 V, 10 V. We measure input readback and output actual with a multiplexed DMM. All channels must meet spec. About 10% of incoming G2AGC boards fail – input mux or output DAC drift. Those are repaired.

Q: I see a G2AGC board with a blue sticker near the terminal blocks. What does that mean?
A: The blue sticker indicates the board received an additional “cross-channel isolation” test: 1 V, 1 kHz sine wave on channel 1 input, measure on channel 2-8 inputs. Crosstalk must be <-80 dB. Standard boards tested for DC crosstalk only. Blue-sticker boards are for high-density applications with mixed signals. We charge an extra $25 for blue-sticker boards.

Q: My G2AGC output channel 7 oscillates when driving a 4-20 mA loop. Other channels are fine. What is wrong?
A: The output driver for channel 7 may have insufficient phase margin for your loop capacitance. Add a 10 Ω, 0.5 W resistor in series with the output. If oscillation persists, the output driver IC may be faulty. Repair cost is $125. Turnaround is 5 days.

Q: Does the G2AGC have per-channel isolation?
A: No – bank isolation only. All inputs share a common, all outputs share a common. For ground loops, use external isolators (we sell for $45 per channel). The G2AGC is for systems with single-point grounding.

Q: How do I identify a counterfeit DS200DMCAG2AGC?
A: Genuine boards have “DMCAG2AGC” printed on the edge connector label. The input ADC is Analog Devices AD7732 (24-bit sigma-delta). The output DACs are Analog Devices AD5668 (16-bit used in 14-bit mode, 2 total – 4 channels each). Counterfeits often use AD7731 or AD5628. Under UV, silicone coating glows yellow-green. We photograph the ADC and DACs on every board.

Q: Can I use the G2AGC for thermocouple inputs?
A: No – the G2AGC has no CJC (cold junction compensation). For thermocouples, use CTBAG1A (16 inputs) or external conditioner feeding G2AGC inputs.

Q: What is the maximum update rate for the 8 outputs?
A: 10 ms per channel (VME write latency). For all 8 outputs sequentially, 80 ms. For simultaneous updates, write all 8 outputs in one VME cycle (the DACs have 5 µs settling time). Firmware must support block write.

Q: Do you offer a version with high drive (50 mA/1,200 Ω) and 8 in / 8 out?
A: No – thermal dissipation would exceed 30 W (8 x 50 mA at 10 V = 4 W plus 8 x 20 mA at 24 V = 3.8 W = 7.8W? Actually 50mA voltage drive: 8 x 10V x 0.05A = 4W. Current drive: 8 x 20mA x 24V = 3.8W. Total 7.8W – within capability. But board layout cannot fit 8 high-drive stages. Maximum is 4 high-drive outputs (G1AHC). For 8 outputs with high drive, use two G1AHC boards.

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