DS200DMCBG1ACB | GE Speedtronic Module | In Stock

Description

Product Introduction

The GE DS200DMCBG1ACB is a high-drive analog combination I/O module for the Mark V Speedtronic turbine control system. It combines per-channel isolated outputs with 50 mA voltage drive and 1,200 Ω current drive capability. This module is designed for long cable runs or multiple loads in series while maintaining ground loop isolation.

Core advantage: The ACB revision drives 2,000 ft cables in voltage mode (standard isolated output: 500 ft) and supports two 500 Ω loads in series in current mode (standard: one 500 Ω load). The isolation prevents ground loops between the controller and the remote loads. Field data from large industrial facilities shows this board eliminates both ground loop noise and signal repeaters.

Key Technical Specifications

Key Selling Points & Differentiators

• Isolated outputs + high drive – Only Mark V analog combo board with both. Drives long cables without ground loops.
• 50 mA voltage drive – 5x standard isolated – Standard DMCBG1 (10 mA) limited to 500 ft. ACB drives 2,000 ft.
• 1,200 Ω current drive – double standard – Supports two 500 Ω loads in series while maintaining isolation.
• Same 1,500 V output isolation – No reduction in isolation for high drive.
• 4 in / 4 out density – Same channel count as DMCBG1.
• Live tested with 2,000 ft cable and isolation – Outputs driven at 2,000 ft while output common is at 500 V relative to backplane.
• 30-day warranty with cross-ship – High-drive or isolation failure? We send replacement same day.

Frequently Asked Questions (FAQ)

Q: What is the difference between DS200DMCBG1 (standard drive, isolated) and DS200DMCBG1ACB (high drive, isolated)?
A: Output drive capability. DMCBG1: 10 mA voltage / 600 Ω current, 580 mA draw. DMCBG1ACB: 50 mA voltage / 1,200 Ω current, 700 mA draw. For long cable runs (over 500 ft) or multiple loads in series with ground loop isolation, use ACB.

Q: Can I replace a DMCBG1 with an ACB without wiring changes?
A: Yes – pinout and terminal block assignments are identical. The ACB draws 120 mA more current (700 mA vs 580 mA) – check backplane 5 V budget. The higher drive may cause oscillation with old, high-impedance loads. Test before commissioning.

Q: How do you test the high-drive and isolation simultaneously on refurbished boards?
A: We connect a 2,000 ft cable to each voltage output while the output common is held at 500 V DC relative to backplane ground. We command 0-10 V step and measure settling time (<20 ms). About 12% of incoming ACB boards fail – drive transistor or isolation transformer damaged. Those are repaired or scrapped.

Q: I see an ACB board with a purple sticker near the output transformers. What does that mean?
A: The purple sticker indicates the board received an additional “high-capacitance” test: 20,000 pF load (2,000 ft cable) at 1 kHz square wave while output common is at 1,000 V DC. The output must remain stable. Standard boards tested with DC only. Purple-sticker boards are for high-frequency PWM with long cables in high common mode voltage applications. We charge an extra $35 for purple-sticker boards.

Q: My ACB board output channel 3 oscillates when driving 1,500 ft cable. Other channels are fine. What is wrong?
A: The output driver for channel 3 has insufficient phase margin for your cable capacitance. Add a 10 Ω, 0.5 W resistor in series with the output. If oscillation persists, the drive transistor may be faulty. Repair cost is $135. Turnaround is 5 days.

Q: Can I use the ACB outputs to drive three 4-20 mA devices in series?
A: Three 250 Ω devices = 750 Ω, within 1,200 Ω rating – yes. Three 500 Ω devices = 1,500 Ω – exceeds rating. For 1,500 Ω, use an external 24 V power supply. The ACB’s internal supply (isolated) is limited to 1,200 Ω.

Q: How do I identify a counterfeit DS200DMCBG1ACB?
A: Genuine boards have “DMCBG1ACB” printed on the edge connector label. The drive transistors are Onsemi MJD44H11 (DPAK, 4 total). The isolation transformers are custom GE yellow toroids (4 total). Counterfeits often use smaller transistors or omit isolation. We photograph the drive transistors and transformers on every board.

Q: Does the ACB have isolated inputs as well?
A: No – inputs have bank isolation only. For fully isolated I/O with high drive, combine ACB outputs with CTBDG1A (isolated thermocouple inputs) or add external input isolators.

Q: What is the maximum common mode voltage the isolated outputs can withstand while driving 2,000 ft cable?
A: 1,500 V RMS continuous. The isolation transformers are rated 1,500 V. The high drive stage (50 mA) does not reduce isolation rating. For 2,500 V transient protection, add external surge suppressors.

Q: Do you offer a version with conformal coating, isolated outputs, and high drive?
A: Yes – special order DS200DMCBG1ACB-ABB (acrylic coated). Lead time is 21-28 days. Cost adds $75. For offshore platforms requiring long cable runs, ground loop elimination, and corrosion protection, this combination is recommended. Contact us for details.

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