DS200SHCAG1B | GE DS200 High Current Valve Driver In Stock

Description

Product Core Brief

• Model: DS200SHCAG1B
• Brand: General Electric (GE)
• Series: Mark V DS200
• Core Function: Extended-range servo hydraulic amplifier
• Product Type: High Current Servo Hydraulic Driver (1 channel)
• Key Specs: 0–300 mA output | 15Ω minimum load | Adjustable gain/offset/dither
• Condition: New Surplus.

Product Introduction

The DS200SHCAG1B is an extended-range servo hydraulic amplifier for GE’s Mark V DS200 series, used in Speedtronic turbine control systems. It converts the ±10 VDC output from an SDCC servo controller into a 0–300 mA current output for high-current hydraulic valves.

Standard SHCAG1 provides 0–200 mA into a 20Ω minimum load. The “1B” variant extends output to 300 mA into a 15Ω minimum load. Use it for older or high-flow hydraulic valves that require higher drive current. Includes adjustable gain (60–300 mA per 10 V), adjustable offset (±10 mA), adjustable dither (100–400 Hz, 0–20% amplitude), short-circuit protection, and thermal shutdown. Drives torque motor valves on large turbines, hydraulic actuators, and high-flow servo valves.

Key Technical Specifications

Key Selling Points & Differentiators

• 0–300 mA output – 50% higher current than standard SHCAG1 (200 mA). Drives high-current torque motor valves on large hydraulic systems.
• 15Ω minimum load – Drives valves with lower coil resistance. Standard SHCAG1 requires 20Ω minimum.
• Adjustable gain (60–300 mA per 10 V input) – Match valve sensitivity. Covers wider range than standard (5–200 mA).
• Adjustable offset (±10 mA) – Compensate for valve spring bias or zero drift. Wider range than standard (±5 mA).
• Short-circuit and thermal protection – Foldback current limiting. Shutdown at 85°C, auto-reset at 75°C.
• Feedback monitor output – 0–10 VDC proportional to 0–300 mA. Connect to SDCC analog input for closed-loop current control.
• QC includes 300 mA burn-in for 24 hours – Verified into 15Ω load at +65°C ambient.
• 2-year warranty

Frequently Asked Questions (FAQ)

Q: What is the difference between SHCAG1 (200 mA, 20Ω min) and SHCAG1B (300 mA, 15Ω min)?

Q: What valves require 300 mA drive current?
A: Older torque motor valves (1970s–1980s GE turbines), high-flow servo valves, valves with dual coils wired in parallel, or valves with coil resistance below 20Ω. Examples: Moog 62 series (100–250 mA), Vickers high-flow (200–300 mA). Check valve datasheet for “maximum coil current.”

Q: Does the SHCAG1B require an external 24 VDC power supply?
A: Yes—at 300 mA into 15Ω, voltage drop is 4.5 V. The remaining 19.5 V is dissipated as heat (approx 5.8 W). Total power supply current: 300 mA (output) + 200 mA (internal) = 500 mA minimum. However, during startup or fault conditions, current may spike. Use external 24 VDC supply rated 3 A minimum (we sell ACC-PS-24V-5A). Backplane 24 VDC is typically limited to 1 A—insufficient.

Q: What is the minimum load resistance calculation?
A: The board’s output compliance voltage is 24 VDC minus approximately 4.5 V drop across output transistors at 300 mA. Available voltage to load = 19.5 V. For 300 mA, R = V/I = 19.5/0.3 = 65Ω theoretical minimum. However, the board is specified for 15Ω minimum because the load only needs to drop 4.5 V at 300 mA (R = 4.5/0.3 = 15Ω). If your valve coil resistance is below 15Ω, add an external resistor in series. Example: 10Ω coil requires 5Ω external resistor (5W rating).

Q: How do I set the dither for a high-current valve?
A: High-current valves typically have higher inertia and may require higher dither amplitude (15–20%) and lower frequency (100–150 Hz). Start with 150 Hz, 10% amplitude. Increase amplitude until valve moves smoothly without audible buzzing. Reduce amplitude to minimum that prevents stiction. Use an oscilloscope on the feedback monitor output to observe dither waveform.

Q: What is the output current limit?
A: 350 mA foldback. At 350 mA, output current reduces to 100 mA. Remove overload, output recovers automatically. The board will not be damaged by continuous short circuit.

Q: What QC tests are specific to the SHCAG1B?
A: Nine tests (extended for higher current):

1. Output capability: 300 mA into 15Ω load
2. Minimum load verification: 15Ω operation, no thermal shutdown within 1 hour
3. Output linearity: 0–300 mA in 30 mA steps, error <±0.5%
4. Offset adjustment: ±10 mA range
5. Gain adjustment: 60–300 mA per 10 V
6. Dither: 100–400 Hz, 0–20% amplitude
7. Short-circuit test: foldback to <350 mA
8. Thermal shutdown: 85°C ±5°C
9. Burn-in: 72 hours at +65°C, output at 300 mA into 15Ω load (with forced air cooling)

Q: What shipping protection?
A: Anti-static bag, ESD foam cradle, double-wall box with “HEAVY,” “ESD SENSITIVE” labels. Each board ships individually. Potentiometer adjustment tool included. External power supply not included (order separately). Spare fuses (350 mA slow-blow) included. Configuration guide included

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