DS3800HHTB1D1D GE

Parameters

• I/O Type: Discrete input (24V DC) / relay output (Form C, configurable)

• Channels: 8 relay outputs + 8 discrete inputs (hybrid configuration)

• Input Voltage: 24V DC (nominal), 10–30V DC range

• Output Rating: Relay – 5A @ 120V AC / 3A @ 24V DC

• Isolation: 2500V RMS optical isolation (inputs) / 1500V RMS (relay contacts)

• Power: +5V DC @ 1.0A, +24V DC @ 1.0A (field power for relays)

• Response Time: 8ms input scan (D1 optimized), 12ms output relay actuation (D1 improved)

• Coating: Conformal coating (suffix D) – medium-thickness acrylic with improved humidity and mild chemical resistance

• Temp Range: -15°C to +70°C (extended, enabled by D coating)

• Mounting: 6U VME Eurocard, single-slot

• Diagnostics: Enhanced onboard with per-channel LED status, relay contact wear monitoring, and over-current detection (D1 feature)

Advantages & Features

• Higher current relay outputs (5A) allow direct driving of solenoids and contactors without external interposing relays

• D1 firmware offers faster response (8ms input, 12ms output), relay contact wear monitoring, and enhanced diagnostics – a significant upgrade over standard HHTB

• Hybrid I/O configuration – combines 8 relay outputs and 8 discrete inputs on a single board, saving cabinet space

• D-grade coating provides superior moisture resistance and mild chemical protection – suitable for environments with frequent humidity or light chemical exposure

• Form C relay contacts (NO/NC) provide flexibility for fail-safe and trip circuit designs

• Extended temperature range (-15°C to +70°C) offers more flexibility than B/C variants

• Front-panel LEDs for per-channel status, relay activation, and diagnostic alerts

• Compatible with Mark IV backplanes and some VIe systems (with adapter)

Application Cases

• Turbine fuel and steam solenoid valve control (high-current direct drive) in humid indoor environments

• Emergency trip system (ETS) logic with relay outputs for shutdown valves requiring fast response

• Annunciator panel driver with high-current alarm indicators in plants with occasional moisture

• Speedtronic Mark IV I/O expansion for Frame 6B/7EA gas turbines where D1 diagnostics are beneficial

• Retrofit from DS3800HHTB or DS3800HHTB1C1C where faster response and better protection are needed

Competitor Comparison

• vs. DS3800HHTB (standard B variant): Faster response (8ms vs. 10ms input, 12ms vs. 15ms output), relay wear monitoring, D coating (vs. B), wider temp range (-15°C vs. 0°C) – significant upgrade

• vs. DS3800HHTB1C1C (C variant): Better coating (D vs. C), wider temp range, and D1 diagnostics – otherwise similar

• vs. DS3800HHRB1D1D (HHR series): Higher output current (5A vs. 2A relay or 0.5A transistor), but fewer I/O channels (16 total vs. 32) – HHTB is better for direct high-current load driving

• vs. DS3800HMPB (Mark IV output board): Higher current capacity and hybrid I/O (input + output) vs. fixed output only

• vs. ABB DSDI series: Higher relay output current, but ABB offers PROFIBUS/Modbus communication options

• vs. Siemens 6ES7 series: Higher current capacity, but GE Mark IV backplane integration is more seamless for existing Speedtronic cabinets

• vs. Woodward 5437 modules: Higher current rating and hybrid I/O, but Woodward offers more flexible configuration software

• vs. Honeywell 51304638 : Higher output current capability and D1 diagnostics, but Honeywell offers better long-term contact reliability

Selection Suggestions

• Confirm your backplane provides both +5V and +24V field power with sufficient current capacity (+24V @ 1.0A)

• Assess output current requirements – HHTB1D1D supports up to 5A, suitable for direct solenoid/contactor drive

• Determine I/O mix – 8 inputs + 8 relay outputs is ideal for applications requiring both sensing and actuation

• Evaluate environmental conditions – D coating is suitable for frequent humidity and mild chemical exposure; choose G/H for more demanding conditions

• Order mating front connector (p/n may vary – confirm with GE)

• For critical applications, purchase with a calibration certificate and 12-month warranty

Precautions

• Critical: Confirm output current rating – do not exceed 5A per relay channel (AC) or 3A (DC)

• Critical: Relay outputs are Form C (NO/NC) – verify wiring to normally open or normally closed contacts based on fail-safe requirements

• Critical: D1 firmware diagnostics require compatible turbine control logic – verify software support before installation

• Use shielded cables for input wiring to avoid EMI – especially near VFDs or large transformers

• Ensure field power supply (+24V DC) is stable and within 10–30V DC range

• D coating provides good protection but is not suitable for direct salt spray, heavy chemical exposure, or continuous condensation – upgrade to G/H for those conditions

• Allow 30–45 minute warm-up before commissioning (D coating affects thermal equilibrium)

• Store in ESD-safe packaging – the edge connector is static-sensitive

• Periodically check output relay contact wear – replace board if contacts show signs of pitting or welding

• Do not hot-swap – Mark IV backplanes require power-off for insertion/removal

• Verify turbine control logic supports the I/O mapping of this board – older cabinets may have addressing limitations

• If replacing a similar board, confirm pinout compatibility – HHT series may have different wiring assignments than HHR or HFP series