DS200SDCIG1AGB | Mark V Turbine High Power Discrete Interface OEM

Description

Product Introduction

The DS200SDCIG1AGB is a high-voltage electromechanical relay interface board for GE’s Mark V DS200 series, used in Speedtronic turbine control systems. It provides four heavy-duty Form C relay outputs for direct switching of servo valve power supplies, motor starters, or solenoid valves, along with eight 4–20 mA feedback inputs for position monitoring.

The “AGB” suffix indicates a high-power relay variant. Unlike the AFB (solid state, 2 A) or standard SDCIG1A (analog ±10 V), the AGB switches up to 10 A at 250 VAC or 30 VDC. Use it to interrupt servo valve power for emergency trips, switch hydraulic pump contactors, or control high-current solenoids. The board includes bifurcated contacts for reliability, per-channel LED status, and flyback diode suppression. It conditions 4–20 mA feedback signals from valve position transmitters on the same board.

Key Technical Specifications

Key Selling Points & Differentiators

• 4 x 10 A relay outputs – Switch servo valve power supplies (240 VAC), hydraulic pump contactors, or high-current solenoids directly. No external interposing relays needed.
• Form C (SPDT) contacts – Provides both NO (normally open) and NC (normally closed) contacts. Use NC for fail-safe circuits (valve enabled when relay is de-energized).
• Bifurcated (twin) contacts – Two parallel touching surfaces per contact. Reduces contact resistance by 50% and provides redundancy. Reliable down to 100 mA loads.
• 8 x 4–20 mA feedback inputs – Monitor valve position on the same board. No separate feedback card needed.
• Isolated relay coils from field contacts – 2500 VAC isolation protects the Mark V backplane from field-side transients.
• Flyback diode + capacitor suppression – Reduces EMI from coil switching. Standard diode-only suppression can cause false triggers on nearby analog inputs.
• QC includes 10 A load test on all 4 relays – 24 hours at 10 A resistive, 30 VDC. Contact resistance measured before and after (<50 mΩ initial, <100 mΩ final).
• 2-year warranty

Frequently Asked Questions (FAQ)

Q: What is the difference between SDCIG1AFB (SSR), SDCIG1AGB (10 A relay), and SDCIG1A (analog ±10 V)?

Choose AGB for switching AC power to valves, pumps, or solenoids. Choose AFB for fast DC enable signals. Choose SDCIG1A for continuous analog servo control.

Q: Can I use the AGB to directly switch a 240 VAC hydraulic pump (1 HP, 5 A running, 25 A inrush)?
A: No. The 25 A inrush will weld the relay contacts within a few starts. Use the AGB to control an external contactor (25 A rating). The AGB switches the contactor coil (5–10 VA). We sell suitable contactors (part MTR-CONT-25A). For resistive loads (heaters, lights) at 10 A, direct switching is fine.

Q: The board has 8 feedback inputs. How do I wire them to 2-wire loop-powered transmitters?
A: Connect the transmitter directly to the input terminals (+ and -). The board supplies isolated 24 VDC loop power. No external power supply needed. For 4-wire transmitters (externally powered), move the jumper on the feedback input pair to “EXT” position.

Q: What is the minimum load for the relay contacts?
A: 100 mA at 12 VDC. Below 100 mA, the bifurcated silver-tin oxide contacts may develop oxidation that prevents reliable closure. For low-level switching (<100 mA), use the SDCIG1AFB (SSR, no minimum load) or an external gold-flashed interposing relay.

Q: Can I replace a failed relay in the field?
A: Yes—the relays are through-hole soldered. Desoldering requires a vacuum station. We offer relay replacement service (22 per relay + return shipping). For critical applications, keep a spare AGB board instead of attempting field repair. We sell bare relays (part RELAY-HP-10A, 14 each).

Q: What is the contact resistance specification?
A: New: <50 mΩ at 1 A (four-wire measurement). After 50,000 operations at 10 A: <100 mΩ. We measure contact resistance before and after load testing in QC.

Q: What QC tests are specific to the AGB revision?
A: Eleven tests:

1. Coil resistance: 800Ω ±3%
2. Contact resistance: <30 mΩ at 1 A
3. Isolation: relay contacts to backplane at 3000 VAC; feedback to backplane at 1800 VAC
4. Operate test: 500 cycles, monitor closure
5. Load test (all 4 relays): 10 A resistive, 24 hours. Contact resistance final <100 mΩ
6. Inductive load test (sample): 5 A at 30 VDC, L/R=40 ms, 25,000 cycles
7. Feedback calibration: 4.000, 12.000, 20.000 mA, error <±0.02 mA
8. Coil suppression: verify flyback diode + capacitor (no excessive ringing)
9. Thermal imaging: 10 A on all 4 relays, 4 hours, hot spots <85°C
10. LED test: verify red LED illuminates at 24 VDC coil energization
11. Burn-in: 72 hours at +65°C, all relays cycling at 1 Hz with 5 A load

Q: What shipping protection?
A: Anti-static bag, ESD foam cradle with cutouts for fixed screw terminals (relay side) and removable blocks (feedback side). Double-wall box with “HEAVY” (board weight 1.1 kg), “FRAGILE,” “ESD SENSITIVE” labels. Each board ships individually. Thermal pad kit (for panel mounting if dissipating >10 W) in separate bag. Spare relays in ESD bag. Torque card included.

330180-51-00 Bently
330180-51-CN Bently
330180-90-00 Bently