DS200SVAAG1 | GE Mark V Servo Valve Amplifier

Description

Product Core Brief

• Model: DS200SVAAG1
• Brand: General Electric (GE)
• Series: Mark V DS200
• Core Function: Servo valve amplifier
• Product Type: Servo Valve Amplifier (1 channel)
• Key Specs: 0–200 mA output | ±10 V input | Dither | Short-circuit protected | 24 V loop power
• Condition: New Surplus.

Product Introduction

The DS200SVAAG1 is a servo valve amplifier board for GE’s Mark V DS200 series, used in Speedtronic turbine control systems. It converts a ±10 VDC control signal from the servo controller (SDCC) into a 0–200 mA current output to drive electro-hydraulic servo valves directly.

The SVAAG1 is a standalone amplifier designed for torque motor valves requiring up to 200 mA drive current. Features include adjustable gain (5–200 mA range), adjustable offset (±5 mA), adjustable dither (100–400 Hz, 0–20% amplitude), short-circuit protection, and 24 V loop power. Use it to drive fuel valves, steam valves, and hydraulic actuators when the servo controller’s output current is insufficient.

Key Technical Specifications

Key Selling Points & Differentiators

• 0–200 mA output – Drives most torque motor valves directly. Standard SDCC outputs only 10 mA.
• Adjustable gain and offset – Match valve sensitivity and zero position.
• Adjustable dither – Prevents valve stiction. Frequency and amplitude adjustable.
• Short-circuit protection – Foldback current limiting. Auto-recovery.
• Feedback monitor output – ±10 VDC proportional to output current. Close loop in SDCC.
• Isolated input – 1500 VAC between control signal and valve output.
• QC includes 24-hour 200 mA burn-in – Verified into 20Ω load.
• 2-year warranty

Frequently Asked Questions (FAQ)

Q: What is the difference between SVAAG1 and SDCC servo controller?
A: SDCC performs PID calculation and reads valve position feedback. SVAAG1 is a simple amplifier—it converts ±10 V to 0–200 mA without PID. Use SVAAG1 with external PID controller (SDCC or external PLC).

Q: What valves does the SVAAG1 drive?
A: Torque motor valves (Moog, Vickers, Bosch-Rexroth) with coil resistance 20–100Ω and current requirement 40–200 mA. Examples: Moog D63x, Vickers SM4.

Q: Does the SVAAG1 require an external 24 VDC power supply?
A: Yes—recommended. Board draws up to 1.5 A at 200 mA output. Backplane 24 VDC is typically limited to 1 A. Use external 24 VDC supply (3 A recommended). We sell ACC-PS-24V-5A.

Q: How do I set the dither?
A: Two potentiometers. Frequency: 100–400 Hz. Amplitude: 0–20% of output. Start with 200 Hz, 10%. Increase amplitude until valve moves smoothly. Use oscilloscope on feedback monitor output.

Q: What is the minimum load resistance?
A: 20Ω. Below 20Ω, output current may not reach 200 mA (voltage compliance limit). If your valve coil is below 20Ω, add external series resistor.

Q: What QC tests are specific to the SVAAG1?
A: Eight tests:

1. Output linearity: 0–200 mA, error <±0.5%
2. Offset adjustment: ±5 mA range
3. Gain adjustment: 5–200 mA range
4. Dither: 100–400 Hz, 0–20% amplitude
5. Short-circuit: foldback to <250 mA
6. Thermal shutdown: 85°C
7. Isolation: 1800 VAC
8. Burn-in: 72 hours at +65°C, output at 200 mA into 20Ω

Q: What shipping protection?
A: Anti-static bag, ESD foam cradle, double-wall box. Each board ships individually. Potentiometer adjustment tool included. Configuration guide included. Spare fuses included. External power supply not included (order separately).

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