DS200SDCCG2A | GE Mark V Quad Servo Controller

Description

Product Core Brief

• Model: DS200SDCCG2A
• Brand: General Electric (GE)
• Series: Mark V DS200
• Core Function: Quad-channel servo drive controller for multi-valve coordination
• Product Type: Servo Drive Controller (4 channels, independent)
• Key Specs: 4 analog outputs | 8 analog feedback inputs | 1 ms scan | 16-bit | 4 isolated banks
• Condition: New Surplus.

Product Introduction

The DS200SDCCG2A is a quad-channel servo drive controller for GE’s Mark V DS200 series, used in Speedtronic turbine control systems. It provides four independent servo control loops on a single board—for applications requiring coordinated control of up to four valves or actuators (e.g., gas turbine fuel control with multiple fuel stages, steam turbine with multi-valve admission, or compressor anti-surge with recycle valves).

The SDCCG2A is essentially four SDCCG1 controllers on one PCB, sharing backplane power and communication but with independent PID parameters, feedback inputs, and outputs per channel. It saves three rack slots compared to using four single-channel SDCCF1 boards, or two slots compared to two SDCCG1 dual-channel boards. It is designed for large turbine control systems with multiple servo-actuated valves.

Key Technical Specifications

Quad-Channel Features (SDCCG2A)

Key Selling Points & Differentiators

• Four servo controllers in one slot – Controls up to four independent valves simultaneously. Saves three rack slots versus SDCCF1 boards, or one slot versus two SDCCG1 boards.
• Independent PID per channel – Tune Channel 1 for fuel valve (fast response), Channel 2 for bypass (medium), Channel 3 for bleed (slow), Channel 4 for start-up fuel (unique curve). All parameters stored independently.
• Redundant feedback per channel (2 x 4–20 mA) – Each channel accepts two 4–20 mA position feedback signals. Configure per channel: use average, select best, or primary/backup.
• Fast 1 ms update rate on all four channels simultaneously – All four loops update at 1 kHz concurrently. No time-slicing or scan penalty for multiple channels.
• Synchronized output capability – For applications requiring coordinated movement (e.g., multiple fuel stages opening together), channels can be synchronized via software to update outputs at exactly the same time (jitter <5 µs).
• QC includes four-channel simultaneous closed-loop test – All four channels tested concurrently with simulated valve loads. Cross-channel interference measured (<0.1% of span).
• Configuration backup available – Send us your old board. We extract configuration for all four channels and program into replacement.
• 2-year warranty – Covers all four channels.

Frequently Asked Questions (FAQ)

Q: What is the difference between SDCCF1 (single), SDCCG1 (dual), and SDCCG2A (quad)?

Choose SDCCG2A when you need four servo loops in one double-width slot.

Q: Can I replace four SDCCF1 boards with one SDCCG2A without changing my configuration?
A: Yes—but with significant reconfiguration. The SDCCG2A presents as a single backplane device with four sub-channels. Your existing system sees four separate boards at different backplane addresses. You must:

1. Remap I/O addresses in the Mark V configuration (reassign each channel to new addresses).
2. Copy PID parameters from each old board to corresponding new channel (we can extract and transfer).
3. Rewire field connections (four SDCCF1 boards have 12 terminal blocks total; SDCCG2A has 8 blocks).
   Allow 12–16 hours.

Q: Are the four channels isolated from each other?
A: Partially. The field inputs (4–20 mA) and outputs (±10 VDC) are isolated from the backplane at 1500 VAC. However, all four channels share a common isolated ground. Isolation between channels is 500 VAC—sufficient for most applications but not full galvanic isolation. For complete isolation between channels, use separate SDCCF1 boards or SDCCG1ABA (fully isolated dual-channel, two boards for quad).

Q: What is the maximum scan rate when all four channels are active?
A: All four channels update simultaneously at 1 ms (1000 Hz). The processor handles all four loops in parallel. Total latency (feedback sample to output update) is 2 ms typical per channel. No degradation when adding channels.

Q: Can I synchronize outputs across channels?
A: Yes. In the Mark V configuration, set “Synchronize Channels” = TRUE. All four output DACs update at the same instant (within 5 µs). Required for applications where multiple valves must move together (e.g., gas turbine fuel staging valves opening simultaneously). Without synchronization, updates may be skewed by up to 0.5 ms—noticeable for fast valves.

Q: What is the total backplane current draw?
A: 2.5 A maximum at 5 VDC with all four channels at full load. Mark V power supplies (DS200PCCAG series) typically provide 5–10 A at 5 V. The SDCCG2A draws 2.5 A—significant but manageable. Add all other modules (CPU, I/O, comms) to ensure you don’t exceed power supply rating. For heavily loaded backplanes, use external 5 V supply (special order).

Q: What QC tests are specific to the quad-channel SDCCG2A?
A: Twelve tests, all documented:
Standard tests per channel (output calibration, feedback calibration, PID loop test) plus:

1. Quad simultaneous step test: Apply 10% step to all four channels simultaneously. Verify all settle within 200 ms, no cross-channel interaction.
2. Cross-channel interference: Run Channel 1 at full ±10 VDC, 1 kHz square wave. Measure induced voltage on Channels 2, 3, 4 outputs. <5 mV peak-peak.
3. Synchronization test: Configure synchronized mode, trigger outputs with oscilloscope. Verify all four outputs change within <5 µs of each other.
4. Total backplane current: Measure at full load (all outputs at 10 mA, all feedback at 20 mA). 2.5 A maximum.
5. Thermal imaging: All four channels at 10 mA output, 20 mA feedback, 4 hours at +65°C. Hot spots <85°C.
6. Feedback input crosstalk: Inject 20 mA on Channel 1 feedback, measure Channel 2 feedback input. <0.01 mA induced.
7. Discrete I/O test per channel: 8 inputs, 8 outputs.
8. Burn-in: 72 hours at +65°C, all four channels running closed-loop simulation. No errors.

Q: What shipping protection?
A: Anti-static bag, ESD foam cradle, double-wall box. Board is double-width (8HP). Shock indicator. Each board ships individually. Configuration extraction service available—ship your old boards (up to 4 SDCCF1 or 2 SDCCG1) for parameter transfer.

CM202
BS210
BS207 BIO459 BIO459/01 PLC DCS
BS206 BIO420 BIO420/00 PLC DCS