DS200SDCCG4AGD | GE Mark V Eight-Axis LVDT Servo

Description

Product Core Brief

• Model: DS200SDCCG4AGD
• Brand: General Electric (GE)
• Series: Mark V DS200
• Core Function: Octo-channel LVDT input servo for turbines with LVDT position feedback
• Product Type: LVDT Input Servo Drive Controller (8 channels)
• Key Specs: 8 x ±10 V outputs | 8 x LVDT inputs | Onboard excitation | 1 ms update
• Condition: New Original.

Product Introduction

The DS200SDCCG4AGD is an octo-channel servo drive controller with direct LVDT position feedback inputs for GE’s Mark V DS200 series, used in Speedtronic turbine control systems. It provides eight independent servo control loops where each valve’s position feedback comes directly from an LVDT without external signal conditioning.

The “4AGD” suffix indicates an eight-channel LVDT input variant. This is the highest channel count LVDT servo controller in the Mark V family. It is designed for large GE heavy-duty turbines (Frame 7, 9) that use LVDTs on multiple fuel valves and steam valves simultaneously. Integrated LVDT excitation and demodulation per channel eliminates up to eight external LVDT-to-4–20 mA converters, saving significant panel space and reducing failure points.

Key Technical Specifications

Octo-Channel LVDT Features (4AGD)

Key Selling Points & Differentiators

• Eight LVDT inputs in one slot – Direct connection for up to eight LVDTs. No external LVDT converters needed. Saves seven rack slots and significant panel space.
• Supports 3-wire and 5-wire LVDTs per channel – Each channel independently configurable.
• Adjustable excitation voltage (1–5 Vrms) per channel – Match each LVDT manufacturer’s specification.
• Phase adjustment (0–360 degrees) per channel – Compensate for cable length and LVDT characteristics independently per channel.
• Built-in LVDT diagnostics per channel – Open coil, shorted coil, ratio check. Fault reported per channel.
• Auto-calibration via software per channel – Calibrate each LVDT independently.
• Redundant feedback option per channel – 4–20 mA secondary input available as backup.
• Synchronized output capability – Coordinate multiple valves. Jitter <5 µs.
• QC includes eight-channel LVDT simulator test – All eight channels tested simultaneously with LVDT simulators.
• 2-year warranty – Covers all eight channels.

Frequently Asked Questions (FAQ)

Q: What is the total backplane current draw?
A: 5.5 A maximum at 5 VDC. This is very high. Most Mark V power supplies are rated 5–10 A at 5 V. You must use a high-capacity power supply (DS200PCCAG5A or equivalent) and minimize other modules. We provide load calculation worksheet.

Q: Can I replace eight SDCCF1 boards (with external LVDT converters) with one SDCCG4AGD?
A: Yes, but requires extensive reconfiguration (40–50 hours). We strongly recommend a factory site visit for first-time installations.

Q: What is the maximum cable length between AGD and LVDT?
A: 500 ft (150 m) with 18 AWG shielded twisted pair per LVDT. Running eight LVDT cables separately is required. Do not run LVDT cables in same conduit as AC power.

Q: The board has 8 LVDT inputs. Can I mix 3-wire and 5-wire LVDTs?
A: Yes. Each channel is independently configurable via software for 3-wire or 5-wire operation.

Q: What QC tests are specific to the SDCCG4AGD?
A: Standard tests per channel plus:

• LVDT excitation voltage and frequency per channel
• LVDT simulator test (all eight channels simultaneously)
• 3-wire and 5-wire LVDT configuration test per channel
• Phase adjustment test per channel
• Open/short detection per channel
• Auto-calibration test per channel
• Cross-channel LVDT interference (all pairs)
• Eight-channel simultaneous step test
• Thermal imaging (all eight channels)
• Total backplane current (5.5 A max)
• Burn-in: 72 hours at +65°C

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

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