DS200SHVIG1B | GE Mark V High Current Valve Positioner

Description

Product Core Brief

• Model: DS200SHVIG1B
• Brand: General Electric (GE)
• Series: Mark V DS200
• Core Function: Extended-range servo valve interface with PI control
• Product Type: High Current Valve Positioner (1 channel)
• Key Specs: 0–300 mA output | 4–20 mA feedback | Onboard PI | 15Ω min load
• Condition: New Surplus.

Product Introduction

The DS200SHVIG1B is an extended-range servo valve interface board for GE’s Mark V DS200 series, used in Speedtronic turbine control systems. It provides 0–300 mA output current for high-current hydraulic valves, combined with a 4–20 mA position feedback input and onboard PI controller.

Standard SHVIG1 provides 0–200 mA into 20Ω minimum load. The “1B” variant extends output to 300 mA into 15Ω minimum load. Use it for older or high-flow hydraulic valves that require higher drive current (250–300 mA) but still need local closed-loop position control. Includes adjustable gain (60–300 mA range), adjustable offset (±10 mA), adjustable dither, PI controller (manual tuning), and short-circuit protection.

Key Technical Specifications

Key Selling Points & Differentiators

• 0–300 mA output – 50% higher current than standard SHVIG1 (200 mA). Drives high-current torque motor valves directly.
• 15Ω minimum load – Drives valves with lower coil resistance. Standard requires 20Ω minimum.
• Onboard PI controller – Closes position loop locally. No SDCC servo controller needed.
• Standalone valve positioner – Accepts 4–20 mA setpoint from DCS. Drives valve to target position.
• Adjustable gain (60–300 mA range) – Match valve sensitivity. Wider range than standard (5–200 mA).
• Adjustable offset (±10 mA) – Wider range than standard (±5 mA). Compensate for valve spring bias.
• Short-circuit and thermal protection – Output folds back on short (<350 mA limit). Thermal shutdown at 85°C.
• QC includes 300 mA burn-in into 15Ω load – Verified for 24 hours at +65°C ambient.
• 2-year warranty

Frequently Asked Questions (FAQ)

Q: What is the difference between SHVIG1 (200 mA, 20Ω), SHVIG1A (200 mA, enhanced), and SHVIG1B (300 mA, 15Ω)?

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. Example: some Moog 62 series valves require 250 mA. Check valve datasheet for “maximum coil current” or “drive current.”

Q: Does the SHVIG1B have auto-tuning like the SHVIG1A?
A: No. The SHVIG1B uses manual potentiometers for PI tuning (P and I). For auto-tuning, use SHVIG1A (200 mA only). If you need 300 mA with auto-tuning, contact us for special order (part SHVIG1BAA, 8–10 week lead time).

Q: What is the minimum load resistance calculation?
A: Board output compliance is 24 VDC minus approx 4.5 V drop at 300 mA. Available voltage to load = 19.5 V. For 300 mA, R = V/I = 19.5/0.3 = 65Ω theoretical minimum. However, board is specified for 15Ω minimum because load only needs to drop 4.5 V (R = 4.5/0.3 = 15Ω). If your valve coil is below 15Ω, add external resistor in series.

Q: How do I tune the PI gains without auto-tuning?
A: Standard method:

1. Set I to 0 (fully counterclockwise).
2. Increase P until output oscillates (valve hunts). Reduce P by 50%.
3. Increase I until steady-state error is eliminated (typically 2–5 seconds).
4. Fine-tune for acceptable overshoot (<15%) and settling time (<300 ms).
   Use an oscilloscope on the feedback monitor output to observe response.

Q: Does the SHVIG1B require an external 24 VDC power supply?
A: Yes—mandatory. At 300 mA into 15Ω, board draws approximately 2 A at 24 V (48 W). Backplane 24 VDC is limited to 1 A. Use external 24 VDC supply rated 5 A minimum (we sell ACC-PS-24V-5A). Do not attempt to run from backplane.

Q: What QC tests are specific to the SHVIG1B?
A: Ten tests (extended for 300 mA):

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. Closed loop PI step response: 10% to 90% step, settling time <300 ms, overshoot <15%
8. Short-circuit test: foldback to <350 mA
9. Thermal shutdown: 85°C ±5°C
10. Burn-in: 72 hours at +65°C, closed loop mode, output at 250 mA into 20Ω load

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. Configuration guide (including PI tuning procedure) included. Spare fuse (350 mA slow-blow) included. External power supply not included (order separately). Setpoint/feedback jumper card included.

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