DS200SDCCG3AFD | GE DS200 Hexa Current Output Servo In Stock

Description

Product Core Brief

• Model: DS200SDCCG3AFD
• Brand: General Electric (GE)
• Series: Mark V DS200
• Core Function: Hexa-channel current output servo for I/P converters and current-input positioners
• Product Type: Current Output Servo Drive Controller (6 channels)
• Key Specs: 6 x 4–20 mA outputs | 12 x 4–20 mA feedback inputs | 1 ms update | 16-bit
• Condition: New Original.

Product Introduction

The DS200SDCCG3AFD is a hexa-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 six independent servo control loops where each output to the valve or I/P converter is a 4–20 mA current signal rather than ±10 VDC voltage.

The “3AFD” suffix indicates a six-channel 4–20 mA output variant. This is the highest channel count current output servo controller in the Mark V family. It is designed for large turbine systems with multiple I/P converters (4–20 mA to pneumatic), current-input valve positioners, or long cable runs where voltage drop is unacceptable. Typical applications: gas turbines with 6 fuel stages (pilot, A, B, C, D, E), steam turbines with 6 admission valves, or large compressor stations with 6 anti-surge recycle valves.

Key Technical Specifications

Hexa-Channel Current Output Features (3AFD)

Key Selling Points & Differentiators

• Six 4–20 mA outputs in one slot – Drives up to six I/P converters or current-input positioners directly. No external voltage-to-current converters needed. Saves five rack slots versus SDCCF1 with external converters.
• 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. 24 V loop power with 1000Ω load capacity handles 2000 ft of 18 AWG cable.
• Redundant feedback per channel (2 x 4–20 mA) – Each channel accepts two position feedback signals.
• Open loop detection per channel – Broken wire detected (<1 mA). Configurable failsafe response per channel.
• Output short-circuit protection per channel – Shorting output to ground will not damage board.
• Synchronized output capability – Coordinate multiple valves (e.g., fuel staging) to move simultaneously. Jitter <5 µs.
• QC includes six-channel simultaneous closed-loop test – All channels tested concurrently.
• 2-year warranty – Covers all six channels.

Frequently Asked Questions (FAQ)

Q: What is the difference between SDCCG3A (±10 V output) and SDCCG3AFD (4–20 mA output)?

Choose AFD for I/P converters or long cable runs.

Q: What is the total backplane current draw?
A: 4.2 A maximum at 5 VDC. This is significant. Most Mark V power supplies are rated 5–10 A at 5 V. The SDCCG3AFD alone draws 4.2 A, leaving little capacity for CPU, I/O, and comms. For most systems, you will need an external 5 V supply (special order) or use a dedicated power supply for this board. We provide load calculation worksheet.

Q: Can I replace six SDCCF1 boards (with external V/I converters) with one SDCCG3AFD?
A: Yes, but requires significant reconfiguration. The SDCCG3AFD presents as a single backplane device with six sub-channels. Allow 20–30 hours for re-termination and logic changes. We strongly recommend a factory site visit.

Q: What is the maximum cable length for 4–20 mA outputs?
A: 2000 ft (600 m) with 18 AWG shielded twisted pair. At 2000 ft, total loop resistance: 1000Ω load + 25Ω cable = 1025Ω. The board supplies 24 V, 20 mA requires 1200Ω max—1025Ω is within spec. For longer runs, use external repeaters.

Q: What QC tests are specific to the SDCCG3AFD?
A: Standard tests per channel (output calibration 4–20 mA, feedback calibration, PID loop test) plus:

• Six-channel simultaneous step test
• Cross-channel interference (all channel pairs)
• Open loop detection per channel
• Short-circuit protection per channel
• Synchronization test (all six outputs)
• Thermal imaging (all six channels at 20 mA into 500Ω)
• Total backplane current measurement (4.2 A max)
• Burn-in: 72 hours at +65°C, all channels running

Q: What shipping protection?
A: Anti-static bag, ESD foam cradle, double-wall box with “HEAVY,” “FRAGILE” labels. Each board ships individually. Current loop test jig included. Configuration extraction service available.

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