DS200SDCCG4AFD | GE DS200 Octo Current Output Servo In Stock

Description

Product Core Brief

• Model: DS200SDCCG4AFD
• Brand: General Electric (GE)
• Series: Mark V DS200
• Core Function: Octo-channel current output servo for I/P converters
• Product Type: Current Output Servo Drive Controller (8 channels)
• Key Specs: 8 x 4–20 mA outputs | 16 x 4–20 mA inputs | 1 ms update | 16-bit
• Condition: New Original.

Product Introduction

The DS200SDCCG4AFD is an octo-channel servo drive controller with 4–20 mA current outputs for GE’s Mark V DS200 series, used in Speedtronic turbine control systems. It provides eight independent servo control loops where each output to the valve or I/P converter is a 4–20 mA current signal—the highest channel count current output servo controller in the Mark V family.

The “4AFD” suffix indicates an eight-channel 4–20 mA output variant. It is designed for the largest turbine systems with numerous I/P converters (4–20 mA to pneumatic): advanced gas turbines with 8 fuel stages (pilot, A, B, C, D, E, F, G), large steam turbines with 8 admission/extraction valves, or complex compressor stations with 8 anti-surge recycle valves. Direct 4–20 mA outputs eliminate external voltage-to-current converters, saving significant panel space.

Key Technical Specifications

Octo-Channel Current Output Features (4AFD)

Key Selling Points & Differentiators

• Eight 4–20 mA outputs in one slot – Drives eight I/P converters directly. No external voltage-to-current converters. Saves seven rack slots.
• Board-powered current loops (24 VDC) per channel – Each output supplies its own 24 VDC loop power. No external power supplies needed.
• Drives long cable runs (up to 2000 ft) – 4–20 mA immune to voltage drop.
• Redundant feedback per channel (2 x 4–20 mA) – Each channel accepts two position feedback signals.
• Open loop detection per channel – Broken wire detection (<1 mA). Configurable failsafe.
• Output short-circuit protection per channel – Shorting output to ground will not damage board.
• Synchronized output capability – Coordinate multiple valves. Jitter <5 µs.
• QC includes eight-channel simultaneous closed-loop test – All channels tested concurrently.
• 2-year warranty – Covers all eight channels.

Frequently Asked Questions (FAQ)

Q: What is the total backplane current draw?
A: 6.5 A maximum at 5 VDC. This exceeds the capacity of standard Mark V power supplies (typically 5–10 A). You MUST use a high-capacity power supply (DS200PCCAG5A or equivalent) and minimize other modules. For virtually all systems, you will need an external 5 V supply (special order, 10 A minimum). We provide load calculation worksheet.

Q: What is the total loop power requirement?
A: Each channel supplies 24 VDC at up to 20 mA (0.48 W per channel). Total loop power: 8 x 0.48 W = 3.84 W. This is drawn from the board’s internal 24 VDC supply, which is derived from the 5 V backplane. The 6.5 A backplane current accounts for this.

Q: Can I replace eight SDCCF1 boards (with external V/I converters) with one SDCCG4AFD?
A: Yes, but requires extensive reconfiguration (40–50 hours). We strongly recommend a factory site visit for first-time installations. We provide conversion worksheet.

Q: What is the maximum cable length for 4–20 mA outputs?
A: 2000 ft (600 m) with 18 AWG shielded twisted pair per channel. Running eight separate cables is recommended. Running all eight pairs in one large cable may cause crosstalk.

Q: What QC tests are specific to the SDCCG4AFD?
A: Standard tests per channel plus:

• Output calibration (4–20 mA) all eight channels
• Load sweep (0–1000Ω) per channel
• Open loop detection per channel
• Short-circuit protection per channel
• Eight-channel simultaneous step test
• Cross-channel interference (all pairs, 64 combinations)
• Synchronization test (all eight outputs)
• Thermal imaging (all eight channels at 20 mA into 500Ω)
• Total backplane current (6.5 A max)
• Burn-in: 72 hours at +65°C, all channels running at 20 mA into 500Ω

Q: What shipping protection?
A: Anti-static bag, ESD foam cradle, double-wall box with “HEAVY,” “HIGH CURRENT,” “FRAGILE” labels. Each board ships individually. 8-channel current loop test jig included. Pallet recommended for shipment.

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