DS200SHCBG1ABC | GE DS200 Fully Isolated Valve Driver In Stock

Description

Product Core Brief

• Model: DS200SHCBG1ABC
• Brand: General Electric (GE)
• Series: Mark V DS200
• Core Function: Fully isolated dual-channel servo hydraulic amplifier
• Product Type: Isolated Dual Servo Hydraulic (2 channels)
• Key Specs: 2 x 0–200 mA | 2500 VAC isolation | ±250 V common mode | Removable terminals
• Condition: New Original.

Product Introduction

The DS200SHCBG1ABC is a fully isolated 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 with complete galvanic isolation between Channel 1, Channel 2, and the backplane.

The “ABC” suffix indicates a fully isolated dual-channel variant. Standard SHCBG1 channels share a common isolated ground (500 VAC channel-to-channel). The ABC revision provides 2500 VAC isolation between each channel, between channels and backplane, and between input and output. Each channel has its own isolated 24 VDC power supply for the output stage. It is required for applications where two hydraulic valves operate at different ground potentials, or where a fault on one valve must not affect the other.

Key Technical Specifications

Key Selling Points & Differentiators

• Complete galvanic isolation between Channel 1 and Channel 2 – Each channel has its own isolated power domain and isolated 24 V output supply. Channel 1 can float at +250 VDC while Channel 2 is grounded. No cross-channel fault propagation.
• 2500 VAC field-to-backplane isolation – Protects Mark V backplane and CPU from field-side transients and ground loops.
• High common-mode voltage rating (±250 VDC) – Install on valves with floating ground references or long cable runs with induced voltages.
• Isolated 24 V output power per channel – Each channel generates its own 24 VDC for the output stage from the board’s main 24 V input. A short on Channel 1 output does not affect Channel 2.
• Low isolation capacitance (<150 pF per channel) – Reduces high-frequency noise coupling between channels.
• Enhanced input CMRR (80 dB) – Rejects common-mode noise on input signals from SDCC controller.
• Gold-plated terminal pins – No oxidation, maintains low contact resistance in humid/corrosive environments.
• QC includes 3000 VAC isolation test on all domain combinations – 6 domains: Ch1 input, Ch1 output, Ch2 input, Ch2 output, backplane ground. 10 isolation combinations tested.
• 5-year warranty

Frequently Asked Questions (FAQ)

Q: What is the difference between SHCBG1 (standard), SHCBG1A (enhanced), and SHCBG1ABC (isolated)?

Q: Can I replace a standard SHCBG1 with an ABC without changing my wiring?
A: Yes—electrically and functionally compatible. Same pinout, same terminal assignments per channel. However, if your existing wiring has Channel 1 and Channel 2 grounds tied together externally, separate them to benefit from isolation. The ABC will still work (isolation not damaged), but you lose the isolation benefit.

Q: When do I need full channel-to-channel isolation for hydraulic valves?
A: Three scenarios: (1) valves at different ground potentials (e.g., one valve powered from a floating 24 V battery bank, another from grounded 24 V supply), (2) fault containment (a short on one valve’s wiring must not trip the other valve), (3) high common-mode voltage on long cable runs (>100 V induced from nearby power cables).

Q: The ABC has isolated output stages. Do I need two separate external 24 V power supplies?
A: No. The board accepts a single 24 VDC external supply (5 A min). Internal isolated DC-DC converters generate separate, isolated 24 V rails for each channel’s output stage. The input side (signal conditioning) is also isolated per channel.

Q: What is the isolation capacitance between channels?
A: <150 pF. Standard SHCBG1 is 300 pF. Lower capacitance means less high-frequency noise coupling between channels. Critical when one channel switches high current (200 mA) and the other measures sensitive feedback.

Q: What is the common-mode voltage rating?
A: Continuous: ±250 VDC or peak AC between any field terminal (input or output) and ground. Transient: ±1500 V for 1 ms. This allows the ABC to be installed on valves with floating reference or long cable runs without ground connection.

Q: What QC tests are specific to the ABC revision?
A: Thirteen tests (isolation-focused):

1. Channel 1 input-to-output isolation: 3000 VAC, leakage <0.1 mA
2. Channel 2 input-to-output isolation: 3000 VAC
3. Channel-to-channel isolation (input-to-input): 3000 VAC
4. Channel-to-channel isolation (output-to-output): 3000 VAC
5. Output-to-backplane isolation per channel: 3000 VAC
6. Input-to-backplane isolation per channel: 3000 VAC
7. Common-mode voltage test: ±250 VDC applied, output drift <0.2%
8. Isolation capacitance: <150 pF measured at 1 MHz
9. Input CMRR: 80 dB at 60 Hz
10. Standard output tests (linearity, offset, gain, dither per channel)
11. Cross-channel interference at isolation limit: <1 mA induced
12. Dual-channel simultaneous step test with isolated grounds
13. Burn-in: 72 hours at +65°C, both channels at 150 mA into 25Ω load, isolation retested post-burn-in

Q: What shipping protection?
A: Anti-static bag, ESD foam cradle, hard plastic clamshell case, desiccant pack. Double-wall box with “ISOLATED INSTRUMENT,” “HIGH VALUE,” “HEAVY,” “FRAGILE” labels. Shock indicator. Gold-plated spare terminal blocks in separate bag. Isolation test report (10 tests) included. Potentiometer adjustment tools (2) included. Torque card included. External power supply not included (order separately). Each board ships individually.

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