DS200SDCIG2ABA | GE Mark V Isolated Dual Servo Interface

Description

Product Core Brief

• Model: DS200SDCIG2ABA
• Brand: General Electric (GE)
• Series: Mark V DS200
• Core Function: Fully isolated dual-channel servo interface
• Product Type: Isolated Servo Interface Board (2 channels)
• Key Specs: 2 isolated outputs | 4 isolated inputs | 2500 VAC isolation | Gold-plated terminals
• Condition: New Original.

Product Introduction

The DS200SDCIG2ABA is a fully isolated dual-channel servo interface and signal conditioning board for GE’s Mark V DS200 series, used in Speedtronic turbine control systems. It provides two independent servo interface channels with complete galvanic isolation between Channel 1, Channel 2, and the backplane.

The “ABA” suffix indicates a fully isolated variant. Standard SDCIG2A channels share a common isolated ground (500 VAC channel-to-channel). The ABA revision provides 2500 VAC isolation between each channel, between channels and backplane, and between feedback input pairs. It is required for applications where two servo valves operate at different ground potentials, or where a fault on one valve must not affect the other.

Key Technical Specifications

Key Selling Points & Differentiators

• Complete galvanic isolation between Channel 1 and Channel 2 – Each channel has its own isolated power domain. Channel 1 can float at +250 VDC while Channel 2 is grounded. No cross-channel fault propagation.
• 2500 VAC field-to-backplane isolation – Protects Mark V backplane and CPU from field-side transients.
• Isolated 4–20 mA loop power per channel – A short on Channel 1 feedback does not affect Channel 2.
• High common-mode voltage rating (±250 VDC) – Install on valves with floating ground references.
• Low isolation capacitance (<100 pF) – Reduces high-frequency noise coupling between channels.
• Gold-plated terminal pins – No oxidation, maintains <10 mΩ contact resistance for life.
• Enhanced ESD protection (±25 kV) – Highest rating in the interface family.
• QC includes 3000 VAC isolation test on all domain combinations – 6 domains: Ch1 output, Ch1 feedback, Ch2 output, Ch2 feedback, backplane (5 domain pairs, 10 isolation tests).
• 2-year warranty

Frequently Asked Questions (FAQ)

Q: What is the difference between SDCIG2A (standard), SDCIG2AEB (high current), and SDCIG2ABA (isolated)?

Q: Can I replace a standard SDCIG2A with an ABA without changing my wiring?
A: Yes—electrically and functionally compatible. Same pinout, same terminal assignments. However, if your existing wiring has Channel 1 and Channel 2 grounds tied together externally, separate them to benefit from isolation. The ABA will still work (isolation not damaged), but you lose the isolation benefit.

Q: When do I need full channel-to-channel isolation?
A: Three scenarios: (1) valves at different ground potentials, (2) fault containment requirements (a fault on one valve must not affect the other), (3) high common-mode voltage on long cable runs (>100 V induced). For standard installations (both valves share same power supply), SDCIG2A is sufficient.

Q: What is the isolation capacitance between channels?
A: <100 pF. Standard SDCIG2A is 200 pF. Lower capacitance means less high-frequency noise coupling between channels. Critical when one channel switches 120 VAC and the other measures microvolt-level LVDT signals.

Q: The ABA has gold-plated terminal pins. Do I need special ferrules?
A: No. Gold plating is on the pins inside the terminal block housing. The wire screws are nickel-plated steel. Standard copper wire (tinned or bare) is fine. Do not use aluminum wire.

Q: What QC tests are specific to the ABA revision?
A: Standard tests per channel plus: 3000 VAC isolation (10 domain combinations), common-mode voltage test (±250 VDC), isolation capacitance measurement (<100 pF), cross-channel crosstalk at isolation limit, enhanced ESD test (±25 kV), gold plating thickness verification (0.5 µm), conformal coating inspection, burn-in (72 hours at +65°C).

Q: What shipping protection for this high-value board?
A: Anti-static bag, ESD foam cradle, hard plastic clamshell case, desiccant pack. Double-wall box with “ISOLATED INSTRUMENT,” “HIGH VALUE,” “FRAGILE” labels. Shock indicator. Gold-plated spare terminal blocks in separate bag. Isolation test report (10 tests) included. Each board ships individually. Conformal coating touch-up pen included.

330907-05-30-05-02-CN Bently
330930-065-01-CN Bently
990-05-70-01-CN Bently