Description
DS3800HISA1B1B: Product Overview
This board occupies a 6BA Euro-card slot in GE Mark IV turbine and EX2000 exciter control racks, serving as a universal signal conditioner between field devices and the central processor. It accepts mixed analog inputs (±10 V, 4–20 mA) and digital inputs (dry contact, 24 Vdc), provides 1500 Vdc group isolation to protect the 5 V CPU from high-voltage transients, and buffers conditioned signals to the NDIA data bus. On-board 40 mm MOVs clamp lightning-induced surges at the field entry point.
This board occupies a 6BA Euro-card slot in GE Mark IV turbine and EX2000 exciter control racks, serving as a universal signal conditioner between field devices and the central processor. It accepts mixed analog inputs (±10 V, 4–20 mA) and digital inputs (dry contact, 24 Vdc), provides 1500 Vdc group isolation to protect the 5 V CPU from high-voltage transients, and buffers conditioned signals to the NDIA data bus. On-board 40 mm MOVs clamp lightning-induced surges at the field entry point.
The epoxy-sealed construction makes this a line-replaceable module—internal faults require complete card swap rather than field repair. The module hot-swaps when the rack is powered down, and its low profile allows adjacent-slot population without additional cooling. As part of the DS3800 family, it benefits from the Mark IV platform’s deterministic 2 ms control interval and extensive installed base in power generation applications.
DS3800NMEC1D1C
DS3800HISA1B1B: Technical Specifications
-
Model Number: DS3800HISA1B1B
-
Manufacturer: General Electric (GE Fanuc)
-
Product Type: Isolated Signal Auxiliary / Signal Conditioning Board
-
Series: DS3800, Mark IV Speedtronic
-
Form Factor: 6BA Euro-card (≈ 233 × 160 mm)
-
Back-Plane Connector: Dual 40-pin header (J1/J2)
-
Input Types: ±10 V, 4–20 mA, dry contact, 24 Vdc (jumper-selectable per channel)
-
Isolation: 1500 Vdc channel-to-ground; group-isolated
-
Update Rate: 2 ms (analog); 1 ms (digital)
-
Surge Protection: 40 mm MOVs, integral with board traces
-
Power Demand: +5 V @ 0.6 A, ±15 V @ 0.2 A, +24 V @ 0.3 A from rack 2PL bus
-
Operating Temperature: 0 – 60 °C
-
Weight: ≈ 0.22 kg
-
Construction: Epoxy-sealed copper traces—non-repairable
Core Features & Customer Value
Universal Mixed-Signal Isolation: Channel-by-channel jumpers allow any input to be configured for voltage, current, or digital—eliminating separate analog and digital cards. For system integrators, this reduces spares inventory, simplifies wiring, and cuts commissioning time and panel cost.
Epoxy-Sealed Construction: All internal copper is encapsulated in high-temperature epoxy. In coastal or industrial environments with conductive dust and high humidity, this prevents trace-to-trace shorting that would cause random “SIGNAL FAIL” alarms after ten-plus years. The trade-off is non-repairability—internal faults require whole-card exchange—but this is offset by reduced troubleshooting time and single-spare stocking rather than maintaining a repair bench.
Fast Digital Update: The 1 ms digital scan rate captures contact bounce and fast transients that slower analog-only cards miss. For protection engineers, this enables faster detection of limit-switch trips and emergency-stop commands, reducing mechanical damage during fault conditions.
DS3800NMEC1D1C
Typical Applications
In combined-cycle power plants, this board installs in the Mark IV turbine control core to land isolated ±10 V from exhaust-temperature transmitters, 4–20 mA from compressor-discharge pressure sensors, and dry contacts from cooling-fan proving switches—all on one card. The on-board opto-isolators prevent 480 V switching transients from propagating into the 5 V CPU data bus.
On utility-scale EX2000 static exciters, the same card isolates the brushless-exciter field-current transmitter (4–20 mA), diode-fail contact, and field ground-detector relay. Independent channel configurability allows a single card to replace three separate specialty cards.
Mechanical-drive gas compressors frequently use this part number to land 4–20 mA inlet-pressure transmitters, ±10 V guide-vane position feedback, and emergency-stop push-button contacts. Mixed-signal capability on one card makes it a universal signal conditioner for any Mark IV loop requiring flexible, ground-loop-free operation.
