GE DS3800HHRB

Parameters

• I/O Type: Discrete input (24V DC) / output (relay or transistor)

• Channels: Typically 16–32 points (configurable)

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

• Output Rating: 24V DC @ 0.5A per channel (transistor) or 2A @ 120V AC (relay)

• Isolation: 2500V RMS optical isolation

• Power: +5V DC @ 1.0A, +24V DC @ 0.5A (field power)

• Response Time: 5ms input scan, 10ms output update

• Coating: Basic conformal coating (suffix B)

• Temp Range: 0°C to +60°C

• Mounting: 6U VME Eurocard, single-slot

• Diagnostics: LED status per channel

Advantages & Features

• High-density I/O reduces board count in turbine control cabinets

• Optical isolation protects the backplane from field wiring faults and surges

• Flexible I/O configuration – channels can be individually set as input or output (jumper/configurable)

• Fast response suitable for turbine trip and interlock logic

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

• Front-panel LEDs for per-channel status indication

• Hot-swappable (with proper backplane support)

Application Cases

• Turbine emergency trip system (ETS) logic interfacing with limit switches and pressure switches

• Solenoid valve control for fuel, steam, and water injection systems

• Annunciator panel driver for alarm and warning indications

• Speedtronic Mark IV I/O expansion for Frame 5/6B/7EA gas turbines

• Retrofit replacing obsolete DS3800H series discrete boards

Competitor Comparison

• vs. DS3800HHRC (C variant): More channels or different output type; B variant offers basic coating

• vs. DS3800HMPB (Mark IV discrete output board): Similar functionality, but HHRB offers higher density and hybrid I/O capability

• vs. ABB DSDI series: Higher channel density, but ABB offers PROFIBUS/Modbus communication options

• vs. Siemens 6ES7 series: Similar I/O capability, but GE Mark IV backplane integration is more seamless for existing Speedtronic cabinets

• vs. Woodward 5437 modules: Higher density, but Woodward offers more flexible configuration software

• vs. Honeywell 51304638 : Similar I/O capabilities, but GE HHRB offers better compatibility with Mark IV legacy cabinets

Selection Suggestions

• Confirm your backplane provides both +5V and +24V field power – this board requires both

• Verify I/O configuration – some variants are fixed input-only or output-only; check hardware jumpers

• Assess channel count requirements – 16–32 points may suffice for smaller turbines; consider DS3800HHRD for higher density

• Determine output type – transistor outputs (0.5A) for DC loads, relay outputs (2A) for AC loads

• Evaluate environmental conditions – basic coating (B) is for clean, dry indoor installations

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

• For critical applications, consider used/refurbished units with 90-day warranty

Precautions

• Critical: Verify I/O configuration (input vs. output) before installation – wiring to the wrong type may damage the board

• Critical: Confirm output current rating – do not exceed 0.5A per transistor channel or 2A per relay channel

• 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

• Basic coating (B) does not protect against humidity or corrosive gases – upgrade to C/D/G/H if needed

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

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

• Periodically check output relay contact wear (if relay type) – replace board if contacts show signs of pitting

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

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