DS200SHVIG1 | GE DS200 Hydraulic Valve Driver In Stock

Description

Product Core Brief

• Model: DS200SHVIG1
• Brand: General Electric (GE)
• Series: Mark V DS200
• Core Function: Servo valve interface with current output and position feedback
• Product Type: Servo Valve Driver (1 channel)
• Key Specs: 0–200 mA output | 4–20 mA input | 24 V loop power | Optional PID
• Condition: New Surplus.

Product Introduction

The DS200SHVIG1 is a servo valve interface board for GE’s Mark V DS200 series, used in Speedtronic turbine control systems. It combines a 0–200 mA current output to drive electro-hydraulic servo valves with a 4–20 mA position feedback input, forming a complete local control loop.

Unlike the SHCAG1 (which requires an external PID controller), the SHVIG1 includes an onboard proportional-integral (PI) controller. It can operate as a standalone positioner: accept a 4–20 mA setpoint (or ±10 VDC), read valve position from a 4–20 mA LVDT transmitter, and drive the servo valve to maintain position. Use it for retrofits where the existing valve positioner has failed, or where you need local closed-loop control without using SDCC servo controller resources.

Key Technical Specifications

Key Selling Points & Differentiators

• Onboard PI controller – Closes the position loop locally. No SDCC servo controller needed. Reduces backplane communication load.
• Standalone valve positioner – Accepts 4–20 mA setpoint from DCS or PLC. Drives valve to target position. Ideal for retrofits.
• Open loop mode available – Bypass PI, use board as straight amplifier (like SHCAG1). Controlled by ±10 VDC input.
• 4–20 mA position feedback with loop power – Reads LVDT transmitter directly. No external power supply for feedback.
• Adjustable dither – Prevents valve stiction. Frequency and amplitude adjustable.
• Short-circuit and thermal protection – Output folds back on short. Thermal shutdown at 85°C.
• Low-cost alternative to full SDCC servo – For non-critical valves that don’t require full SDCC capabilities.
• QC includes closed-loop step test – Verify PI controller response: 10% to 90% step, settling time <200 ms, overshoot <10%.
• 2-year warranty

Frequently Asked Questions (FAQ)

Q: What is the difference between SHCAG1 (amplifier only), SHVIG1 (amplifier + PI), and SDCC (full servo controller)?

Q: Can I use the SHVIG1 without an external setpoint (just as an amplifier)?
A: Yes. Set the control mode jumper to “Open Loop”. The board then operates like SHCAG1: ±10 VDC input controls output current directly (0–200 mA proportional). PI controller is bypassed.

Q: How do I tune the PI gains?
A: Two potentiometers on board. P (proportional): 0.1–10 (turn clockwise for higher gain). I (integral): 0–10 seconds (turn clockwise for longer integration time, slower response). Tuning procedure:

1. Set I to 0 (fully counterclockwise).
2. Increase P until output oscillates. Reduce P by 50%.
3. Increase I until steady-state error eliminated (typically 1–5 seconds).
4. Fine-tune for acceptable overshoot and settling time.

Q: What is the input impedance for 4–20 mA setpoint?
A: 250Ω (precision burden resistor). Maximum voltage drop = 5 V at 20 mA. Use shielded twisted pair cable for setpoint signal.

Q: Does the SHVIG1 require an external 24 VDC power supply?
A: Recommended. Board draws up to 2 A at 24 VDC (output 200 mA into 20Ω = 4 W dissipation). Backplane 24 VDC is typically limited to 1 A. Use external 24 VDC supply rated 3 A minimum (we sell ACC-PS-24V-3A). The board will run from backplane for low-current applications (<100 mA output).

Q: Can the SHVIG1 accept a 0–10 VDC setpoint instead of 4–20 mA?
A: Yes. Move the setpoint jumper from “4–20 mA” to “0–10 V”. Input impedance becomes 10 kΩ. Use this mode when connecting to a PLC or DCS with voltage output.

Q: What QC tests are specific to the SHVIG1?
A: Ten tests:

1. Open loop mode: output linearity, offset, gain, dither (same as SHCAG1)
2. Closed loop mode: PI controller step response (10% to 90%), settling time <200 ms, overshoot <10%
3. Setpoint input accuracy: 4–20 mA and 0–10 V modes, error <±0.1%
4. Feedback input accuracy: 4–20 mA, error <±0.1%
5. Short-circuit and thermal protection
6. Isolation: input-to-output at 1800 VAC
7. Status LEDs verification
8. Burn-in: 72 hours at +65°C, closed loop mode with simulated valve

Q: What shipping protection?
A: Anti-static bag, ESD foam cradle, double-wall box with “ESD SENSITIVE,” “FRAGILE” labels. Each board ships individually. Potentiometer adjustment tool included. Configuration guide (including PI tuning procedure) included. Spare fuse included. External power supply not included (order separately). Setpoint/feedback jumper card included.

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