DS200SHCAG1BAA | GE DS200 300mA Precision Valve Driver In Stock

Description

Product Core Brief

• Model: DS200SHCAG1BAA
• Brand: General Electric (GE)
• Series: Mark V DS200
• Core Function: Precision extended-range servo hydraulic amplifier
• Product Type: Precision High Current Servo Hydraulic (1 channel)
• Key Specs: 0–300 mA | 16-bit resolution | ±0.05% linearity | Auto-cal | 15Ω min load
• Condition: New Original.

Product Introduction

The DS200SHCAG1BAA is a high-precision extended-range servo hydraulic amplifier for GE’s Mark V DS200 series, used in Speedtronic turbine control systems. It combines the 300 mA output capability of the SHCAG1B with the 16-bit resolution and ultra-low drift of the AAA precision platform.

The “BAA” suffix indicates a precision extended-range variant. Output: 0–300 mA at 16-bit resolution (4.6 µA per bit). Linearity: ±0.05%. Temperature drift: 5 ppm/°C. Minimum load: 15Ω. Includes auto-calibration (no potentiometers), low-distortion sine dither, and current sense feedback (16-bit). Use it for ultra-precise control of high-current hydraulic valves on large turbines, hydrogen seal oil systems requiring high force but also high precision, or nuclear applications.

Key Technical Specifications

Key Selling Points & Differentiators

• 0–300 mA at 16-bit resolution (4.6 µA/bit) – Combines high current drive with ultra-fine resolution. Standard SHCAG1B has ~12 mA steps (8-bit). BAA provides 4.6 µA steps—2,600x finer.
• ±0.05% linearity – Ten times better than standard SHCAG1B (±0.5%). Essential for precision hydraulic control at high currents.
• 5 ppm/°C temperature drift – Standard drifts 100 ppm/°C. BAA maintains accuracy over temperature changes.
• 15Ω minimum load – Drives low-impedance high-current valves. Standard precision AAA drives 20Ω minimum.
• Auto-calibration via RS-232 – No potentiometers. Push-button calibration. Removes offset and gain errors. Stores coefficients in EEPROM.
• Low-distortion sine dither – Reduces mechanical wear on large hydraulic valves. Standard dither is crude triangle wave.
• Current sense feedback (16-bit) – Monitor actual output current. Close the loop in the SDCC servo controller.
• External power supply included – Board cannot run on backplane power (needs 3 A). We include a 24 VDC, 5 A supply.
• QC includes 168-hour burn-in at 300 mA into 15Ω load – Full 16-bit linearity verified. No missing codes.
• 5-year warranty

Frequently Asked Questions (FAQ)

Q: What is the difference between SHCAG1 (200 mA, 8-bit), SHCAG1B (300 mA, 8-bit), SHCAG1AAA (200 mA, 16-bit), and SHCAG1BAA (300 mA, 16-bit)?

Q: What valves require 300 mA at 16-bit resolution?
A: Very few. Combination is rare. Applications: hydrogen seal oil valves (high force to move seal rings, but need sub-micron positioning), large steam turbine admission valves (high hydraulic force, precise positioning for efficiency), nuclear control rods (high current for rapid movement, high precision for positioning). If your valve requires >200 mA but <300 mA AND needs 0.1% precision, BAA is the answer.

Q: Does the BAA require an external power supply?
A: Yes—mandatory. At 300 mA into 15Ω, output power = 1.35 W. Efficiency ~60%, so board draws approx 600 mA at 24 V (14.4 W). Backplane 24 VDC is typically limited to 1 A. We include a 24 VDC, 5 A external supply. Connect to board’s power input terminals.

Q: What is the auto-calibration procedure?
A: Connect RS-232 cable to PC. Run provided software. Select “Auto-Cal”. Board internally measures offset (0 mA) and gain (300 mA). Stores coefficients in EEPROM. Takes 30 seconds. No external meter required. Re-calibrate annually or after any temperature extreme beyond 20–30°C range.

Q: How do I set the dither for a high-current, low-impedance valve?
A: High-current valves (low resistance, 15–20Ω) typically have high inertia. Start with 120 Hz frequency, 15% amplitude. Increase amplitude until valve moves smoothly. Reduce to minimum amplitude that prevents stiction. Use current sense feedback output on an oscilloscope to observe dither waveform (should be clean sine).

Q: What is the output noise specification?
A: <15 µA RMS from 10 Hz to 10 kHz. At 300 mA output, noise is 0.005% of span. Standard SHCAG1B has <200 µA RMS (40x higher). Low noise prevents valve oscillation at steady state.

Q: What QC tests are specific to the BAA revision?
A: Thirteen tests (extended for 300 mA, 16-bit):

1. Output DAC linearity: 0–300 mA ramp, 16-bit, no missing codes
2. Output linearity: measured at 1 mA increments, error <±0.05%
3. Temperature drift: gain measured at 0°C, 25°C, 60°C, drift <5 ppm/°C
4. Output noise: FFT analysis, <15 µA RMS
5. Minimum load test: 15Ω load at 300 mA, 24 hours, no thermal shutdown
6. Current sense feedback: 16-bit, 0–300 mA = 0–10 V, error <±0.1%
7. Auto-calibration verification: residual offset <0.5 mA, gain error <0.02%
8. Dither THD: sine wave distortion <0.5%
9. Isolation: 3000 VAC input-to-output
10. Short-circuit test: foldback to <350 mA
11. Thermal shutdown: 85°C ±5°C
12. Warm-up characterization: accuracy vs time (plot included)
13. Burn-in: 168 hours at +50°C, output at 250 mA into 20Ω load, stability <0.01%

Q: What shipping protection?
A: Maximum protection. Anti-static bag, ESD foam cradle, hard plastic clamshell case, desiccant pack. Double-wall box with “PRECISION INSTRUMENT,” “HIGH VALUE,” “HEAVY,” “FRAGILE” labels. Shock, tilt, temperature indicators. Calibration certificate (NIST-traceable, 14 pages) laminated. Auto-calibration software on USB drive. External 24 VDC power supply (5 A) in separate box. Spare fuses included. Each board ships individually. Do not unpack without 4-hour temperature stabilization.

VECTRON PMS400-005 PLC DCS
newig IF250-L2 PLC DCS
eltex ES51 PLC DCS