DS200SHCBG1 | Mark V Turbine Dual Electro-Hydraulic Interface OEM

Description

Product Core Brief

• Model: DS200SHCBG1
• Brand: General Electric (GE)
• Series: Mark V DS200
• Core Function: Dual-channel servo hydraulic amplifier
• Product Type: Dual Servo Hydraulic Driver (2 channels)
• Key Specs: 2 x 0–200 mA outputs | 20Ω min load per channel | Independent gain/offset/dither
• Condition: New Surplus.

Product Introduction

The DS200SHCBG1 is a dual-channel servo hydraulic amplifier for GE’s Mark V DS200 series, used in Speedtronic turbine control systems. It provides two independent 0–200 mA current outputs to drive two electro-hydraulic servo valves from a single board.

The SHCBG1 is essentially two SHCAG1 amplifiers on one PCB. Each channel converts its own ±10 VDC input (from an SDCC servo controller or other source) into a proportional 0–200 mA output. Use it for dual-valve control: gas turbine fuel and bypass valves, steam turbine HP and IP valve control, or compressor anti-surge and recycle valves. Saves one rack slot compared to two SHCAG1 boards.

Key Technical Specifications

Key Selling Points & Differentiators

• Two independent 0–200 mA amplifiers in one slot – Drive two valves independently. Saves one rack slot versus two SHCAG1 boards.
• Independent adjustment per channel – Gain, offset, and dither set separately for each channel. Match different valve types on the same board.
• 200 mA output per channel – Drives most torque motor valves (Moog, Vickers, Bosch-Rexroth). 20Ω minimum load.
• Adjustable dither per channel – Frequency (100–400 Hz) and amplitude (0–20%) independent per channel. Essential for valves with different stiction characteristics.
• Short-circuit and thermal protection per channel – Each channel protects independently. Fault on Channel 1 does not affect Channel 2.
• Feedback monitor outputs – Monitor actual output current per channel (0–10 V = 0–200 mA). Connect to SDCC analog inputs for closed-loop current control.
• QC includes dual-channel simultaneous 200 mA burn-in – Both channels at 200 mA into 20Ω load for 24 hours. Cross-channel interference measured.
• 2-year warranty

Frequently Asked Questions (FAQ)

Q: What is the difference between SHCAG1 (single) and SHCBG1 (dual)?

Q: Can I replace two SHCAG1 boards with one SHCBG1 without changing my configuration?
A: Yes—electrically and functionally compatible. Same pinout per channel. Re-terminate field wires to the new terminal blocks (same numbering). No logic changes required. Allow 2–3 hours.

Q: Are the two channels isolated from each other?
A: Partially. Each channel’s input is isolated from its output at 1500 VAC. Channels share a common isolated ground. Isolation between channels is 500 VAC—sufficient for most applications. For full channel-to-channel isolation, use two SHCAG1ABA boards (fully isolated, but requires 2 slots).

Q: What is the total power supply requirement?
A: At 200 mA output per channel into 20Ω (4 V drop), each channel dissipates approx (24 V – 4 V) * 0.2 A = 4 W. Total 8 W output stage + logic = approx 2.5 A at 24 VDC. Use external 24 VDC supply rated 5 A minimum (we sell ACC-PS-24V-5A). Backplane 24 VDC is insufficient.

Q: Can I run one channel at 200 mA and the other at 0 mA?
A: Yes. Each channel operates independently. Unused channel can be left disconnected (no input signal, output will be 0 mA). No issues.

Q: How do I set dither differently per channel?
A: Each channel has its own frequency and amplitude potentiometers. Accessible from board edge. Adjust while monitoring output on an oscilloscope or using the feedback monitor outputs. For a fast valve (low mass), use higher frequency (300–400 Hz). For a slow, high-inertia valve, use lower frequency (100–150 Hz).

Q: What QC tests are specific to the SHCBG1?
A: Ten tests (dual-channel):

1. Output linearity per channel: 0–200 mA, error <±0.5%
2. Offset/gain adjustment range per channel
3. Dither frequency/amplitude per channel
4. Short-circuit test per channel (foldback to <250 mA)
5. Thermal shutdown per channel (85°C)
6. Cross-channel interference: Channel 1 at 200 mA square wave, measure Channel 2 output. <2 mA induced.
7. Isolation: input-to-output per channel at 1800 VAC; channel-to-channel at 1000 VAC
8. Dual-channel simultaneous step response: apply step to both channels, verify both settle within 50 ms, no interaction
9. Feedback monitor accuracy per channel: 0–200 mA = 0–10 V, error <±1%
10. Burn-in: 72 hours at +65°C, both channels at 200 mA into 20Ω load

Q: What shipping protection?
A: Anti-static bag, ESD foam cradle, double-wall box with “HEAVY” (board weight 1.1 kg), “FRAGILE,” “ESD SENSITIVE” labels. Each board ships individually. Potentiometer adjustment tools (2) included. Spare fuses (4 x 250 mA) included. External power supply not included (order separately). Configuration guide included.

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