Description
Key Parameters
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Memory Type: 512KB battery-backed SRAM + 1MB EPROM (field-upgradable)
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Bus: VMEbus (24-bit addressing)
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Battery: Lithium 3.6V (field-replaceable, life ~5 years)
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Data Retention: >10 years with battery
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Temp Range: –30°C to +70°C
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Diagnostics: On-board LED (power/battery/activity), write-protect jumper
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Physical: Single-slot 6U VME board
Advantages
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Non-volatile storage – preserves turbine configuration and trip history after power loss.
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Field-upgradeable – EPROMs can be replaced without board swap.
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Low maintenance – battery status is monitored and reported to the main controller.
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Drop-in compatible – works with all Mark IV processor and I/O boards.
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Fault logging – stores last 50 trip events with timestamps for root-cause analysis.
Applications
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Gas turbines – stores IGV calibration curves, fuel valve characteristic tables.
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Steam turbines – holds EHC valve tuning parameters and bearing temperature alarm setpoints.
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Retrofits – replaces older core memory boards that have limited capacity or obsolete batteries.
vs Competitors & Related Variants
| Feature | DS3800NVMB | Generic VME Memory Board |
|---|---|---|
| Native Mark IV firmware support | Yes (GE proprietary) | No (requires custom driver) |
| Battery-backed SRAM | 512KB | Usually 128–256KB |
| Trip log capability | Built-in (50 events) | Not available |
| Temp rating | –30°C to +70°C | 0°C to +60°C |
| Plug-and-play | Yes, direct fit | Requires configuration |
Selection Tips
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Verify your Mark IV rack has an available VME slot with +5V and battery-backup header.
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Check battery date code – replace if older than 4 years.
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For critical redundancy, use two DS3800NVMB boards and mirror configuration data.
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Order spare EPROM chips pre-programmed with your turbine’s specific parameter set.
Critical Precautions
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Battery replacement – power down rack before changing battery; observe polarity.
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ESD – handle with grounded wrist strap; memory chips are CMOS-sensitive.
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Write-protect jumper – enable before performing any firmware updates to prevent accidental corruption.
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Data backup – always export setpoints to a PC before replacing EPROMs.
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Compatibility – confirm firmware revision on the DS3800NVMB matches your main processor board; mismatched versions can cause communication errors.
A-B 1756-TBNH
SIEMENS 3RV6011-1JA10
SIEMENS 3RV6011-1HA10
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