Description
Key Technical Specifications
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Model Number: DS200SHVMG1A
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Manufacturer: General Electric (GE)
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Functional Acronym: SHVM (SCR High-Voltage M-Frame)
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Input Range (DC): –500 mV to +500 mV floating shunt (bridge potential)
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Output (DC Path): Differential frequency 0-500 kHz (VCO) to DCFB / SDCI boards
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AC Current Path: 10:1 jumper-selectable CT attenuation, 144 mA max secondary
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AC Voltage Attenuation: Bypass for 240-600 V; include for 601-1000 V (JP1-17)
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Isolation: 2 kV input-to-logic; 500 V channel-to-channel
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Logic Supply: 28 VDC (20-32 V), 150 mA typical
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Operating Temperature: –40 °C…+70 °C
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PCB Coating: Normal thickness, anti-static / moisture barrier
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Dimensions / Weight: 159 × 178 × 50 mm, 0.8 kg; DIN-rail or panel mount
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Connectors: 96-pin DIN 41612 to VME back-plane; screw terminals for shunt & CT inputs
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Manual: GEI-100174
GE DS200SHVMG1A
Field Application & Problem Solved
EX2100 / EX2000 exciter cubicles need to know exactly what the SCR bridge is doing—both DC link current and AC line current—without floating the low-voltage DSP board at bridge potential. Plug the DS200SHVMG1A into the M-frame rack: the on-board VCOs convert the ±500 mV DC shunt to a 0-500 kHz differential signal the DCFB card can read, while the jumper-selectable CT inputs give you 10:1 attenuation so a 144 mA secondary doesn’t over-drive the ADC. I’ve used these on 7FA peakers—one board per bridge, hot-swappable while the unit is on turning gear, and you still meet UL isolation requirements without external isolators. Value: it collapses a high-voltage isolator, VCO, and CT buffer into one plug-in card you can swap in two minutes.
EX2100 / EX2000 exciter cubicles need to know exactly what the SCR bridge is doing—both DC link current and AC line current—without floating the low-voltage DSP board at bridge potential. Plug the DS200SHVMG1A into the M-frame rack: the on-board VCOs convert the ±500 mV DC shunt to a 0-500 kHz differential signal the DCFB card can read, while the jumper-selectable CT inputs give you 10:1 attenuation so a 144 mA secondary doesn’t over-drive the ADC. I’ve used these on 7FA peakers—one board per bridge, hot-swappable while the unit is on turning gear, and you still meet UL isolation requirements without external isolators. Value: it collapses a high-voltage isolator, VCO, and CT buffer into one plug-in card you can swap in two minutes.
Installation & Maintenance Pitfalls (Expert Tips)
Shunt leads float at bridge potential—short them last – If you land the DC shunt wires while the bridge is hot you’ll arc-weld the 2 kV isolator. De-energize, verify zero energy, then land leads; torque to 0.8 Nm or vibration will walk them out
Shunt leads float at bridge potential—short them last – If you land the DC shunt wires while the bridge is hot you’ll arc-weld the 2 kV isolator. De-energize, verify zero energy, then land leads; torque to 0.8 Nm or vibration will walk them out
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CT secondaries must be shorted before disconnect – The 10:1 attenuator looks like 1.5 Ω to the CT. Open-circuit the CT and you’ll see 2 kV spikes that blow the input resistors. Use the supplied shorting blocks
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VCO zero-offset drifts with temperature – After 30 min at 60 °C the offset can shift 20 kHz, giving you a false 2 % current reading. Zero the VCO in ToolboxST once the cubicle is at operating temp or you’ll chase phantom load swings.
Jumper map is silk-screened backwards – JP1-17 numbers read from the component side; if you mirror the board you’ll set 601-1000 V attenuation on a 480 V system and wonder why the CT signal is 50 % low. Use the drawing, not eye-balling
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GE DS200SHVMG1A
Technical Deep Dive & Overview
Internally the DS200SHVMG1A is a collection of floating VCOs and isolator amps. Two ±500 mV floating inputs feed voltage-controlled oscillators running at 250 kHz center frequency; the delta-frequency is proportional to shunt current and is transmitted differentially to the DCFB card via opto-isolated line receivers. A separate path handles AC line current: the 144 mA CT secondary is dropped across a selectable burden resistor (10:1 or 1:1), buffered, and sent to the SDCI over a 500 kHz carrier. All tuning resistors are 0.1 %, 25 ppm to keep drift under 0.5 % over –30…+70 °C. No firmware—pure analog signal chain—so you can swap it without reloading the controller
Internally the DS200SHVMG1A is a collection of floating VCOs and isolator amps. Two ±500 mV floating inputs feed voltage-controlled oscillators running at 250 kHz center frequency; the delta-frequency is proportional to shunt current and is transmitted differentially to the DCFB card via opto-isolated line receivers. A separate path handles AC line current: the 144 mA CT secondary is dropped across a selectable burden resistor (10:1 or 1:1), buffered, and sent to the SDCI over a 500 kHz carrier. All tuning resistors are 0.1 %, 25 ppm to keep drift under 0.5 % over –30…+70 °C. No firmware—pure analog signal chain—so you can swap it without reloading the controller
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