DS200DMCBG1 | GE Speedtronic Module | In Stock

Description

Product Introduction

The GE DS200DMCBG1 is an analog combination I/O module for the Mark V Speedtronic turbine control system. It provides 4 analog inputs and 4 analog outputs with per-channel galvanic isolation on the outputs. This module is designed for applications where output loads have different ground references.

Core advantage: The G1 revision isolates each of the 4 analog outputs from each other and from the backplane (1,500 V RMS). Standard DMCAG1 has bank isolation (all outputs share a common ground). The DMCBG1 drives four separate floating devices (e.g., I/P converters on different ground potentials) without ground loops. Field data shows this board eliminates 95% of ground-loop-related output errors.

Key Technical Specifications

Key Selling Points & Differentiators

• Per-channel isolated outputs – Each output floats independently. Standard DMCAG1 shares output common. Drives devices on different ground potentials.
• 4 inputs + 4 outputs in one slot – Same density as DMCAG1. No reduction for isolation.
• 1,500 V output isolation – Suitable for driving devices on different power systems (e.g., 24 V and 48 V loops).
• 500 V output-to-output isolation – No crosstalk between outputs. Drives four completely separate loads.
• Same input section as DMCAG1 – 16-bit resolution, ±0.1% accuracy.
• Live tested with floating outputs – Each output tied to different ground references (0 V, 24 V, -24 V, 48 V). Output accuracy maintained.
• 30-day warranty with cross-ship – Isolation failure or output drift? We send replacement same day.

Frequently Asked Questions (FAQ)

Q: What is the difference between DS200DMCAG1 (standard) and DS200DMCBG1 (isolated outputs)?
A: Output isolation. DMCAG1: all outputs share common ground (bank isolation). DMCBG1: each output has its own isolated ground (1,500 V). For driving I/P converters on different ground potentials (e.g., valve positioners on separate skids), use DMCBG1. For single-point grounding, DMCAG1 is sufficient.

Q: Can I replace a DMCAG1 with a DMCBG1 without wiring changes?
A: Yes – pinout and terminal block assignments are identical. The DMCBG1 draws 130 mA more current (580 mA vs 450 mA) – check backplane 5 V budget. The isolated outputs have slightly higher settling time (15 ms vs 10 ms) – may affect fast control loops.

Q: How do you test per-channel output isolation on refurbished boards?
A: We apply 1,500 V AC for 1 second between each output common and the backplane ground. Leakage current must stay <5 mA. We also apply 500 V DC between output 1 common and output 2 common. Leakage must stay <10 µA. About 12% of incoming DMCBG1 boards fail – isolation transformers damaged. Those are scrapped.

Q: I see a DMCBG1 board with a yellow sticker near the output transformers. What does that mean?
A: The yellow sticker indicates the board received an additional “transient immunity” test: 2,500 V, 1.2/50 µs surge between outputs and backplane. The isolators must survive 10 surges. Standard boards tested at 1,500 V only. Yellow-sticker boards are for lightning-prone sites. We charge an extra $30 for yellow-sticker boards.

Q: My DMCBG1 output channel 2 reads correct voltage but has 0.5 V AC ripple (at 60 Hz). What is wrong?
A: The DC-DC converter for channel 2’s isolated power supply may have degraded filtering. The ripple is likely from the 60 Hz backplane power bleeding through. Repair cost is $145. We replace the DC-DC converter and output filter capacitors. Turnaround is 7 days.

Q: Can I use the DMCBG1 outputs to drive 4-20 mA loops with different loop power supplies?
A: Yes – each output is isolated. Output 1 can be powered by 24 V external supply (loop-powered), Output 2 by 12 V supply, etc. The board’s internal 24 V supply is isolated per channel. For external supplies, set output to voltage mode (0-10 V) and use external V/I converter.

Q: How do I identify a counterfeit DS200DMCBG1?
A: Genuine boards have “DMCBG1” printed on the edge connector label. The output isolation transformers are custom GE parts (yellow toroids, 4 total). Counterfeits often omit isolation (direct connection) or use smaller transformers (500 V rating). Also check the DC-DC converters: genuine uses 4 x Murata NME0505S (black cases). Fakes use fewer converters. We photograph the transformers on every board.

Q: Does the DMCBG1 have isolated inputs as well?
A: No – inputs have bank isolation (all inputs share common). For isolated inputs, use CTBDG1A (thermocouple, isolated per channel) or add external isolators. The DMCBG1 focuses on output isolation.

Q: What is the expected life of the isolation transformers?
A: Transformers have no moving parts. Rated life >20 years. Failure mode is usually broken lead wires from vibration. For high-vibration applications (gas turbine skids), we reinforce transformer leads with silicone adhesive. For corrosion (chemical plants), use conformal coated version (special order DMCBG1ABB).

Q: Do you offer a version with conformal coating for offshore use?
A: Yes – special order DS200DMCBG1ABB (acrylic coated). Lead time is 14-21 days. Cost adds 75. Coated version is recommended for offshore and coastal sites. The isolation transformers are potted, but the PCB benefits from coating. For offshore, also specify gold-plated terminal block (25 extra) for I/O connections. The DMCBG1 is popular for offshore drilling platforms where multiple ground references exist.

ACS510-01-088A-4
ACS510-01-125A-4
ACS510-01-157A-4 ABB
ACS510-01-180A-4
ACS510-01-195A-4 ABB