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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | IS200VCRCH1BBB |
| Functional Acronym | VCRC (VME Controller Board) |
| Series | GE Mark VI Speedtronic |
| Form Factor | 6U VME (VME64 compatible) |
| Functional Revision | H1 |
| Hardware Revision | BBB |
| Processor | Motorola 68040 (33 MHz typical) |
| Memory | Flash EPROM + SRAM (configuration dependent) |
| Communication | VME backplane (P1/P2 connectors) |
| I/O Interface | Local expansion bus to I/O packs (TDBC, TDTO, etc.) |
| Firmware | Application-specific (turbine control logic) |
| Operating Temp | 0°C to +60°C (32°F to 140°F) |
| Storage Temp | –40°C to +85°C (–40°F to 185°F) |
| Relative Humidity | 5% to 95% non-condensing |
| Dimensions | 6U x 160mm depth (standard VME) |
| Weight | 1.8 lbs (0.82 kg) |
4. Product Introduction
The GE IS200VCRCH1BBB is a VME controller board from the Mark VI Speedtronic system. This VCRC (VME Controller) board runs turbine control logic for gas and steam turbines in power generation and compressor stations. It mounts directly into a Mark VI VME rack and communicates with I/O packs through the backplane.
The H1 functional revision supports standard Mark VI control configurations. The BBB hardware revision is a mature, field-proven build. No proprietary programmer is required for basic board swapping — but the application firmware must match your turbine. This is new surplus stock, factory-sealed, never installed. GE no longer manufactures these. Buy now to keep your Mark VI system running.
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Board LED completely dark | No VME rack power or failed onboard power supply | ❌ Low | Check rack power supply voltages (+5V, +12V, -12V on backplane) | Replace rack power supply before condemning VCRC board |
| Red FAIL LED steady on | Firmware corruption or processor failure | ✅ High | Cycle rack power. If FAIL persists, board cannot boot | Replace VCRC board. Firmware cannot be field-repaired. |
| Green PASS LED off, no communication to HMI | Lost VME arbitration or backplane connection | ⚠️ Medium | Reseat board firmly into VME slot. Check for bent pins on P1/P2 connectors. | Clean edge connectors with isopropyl alcohol. Retest. Replace if no change. |
| Turbine trips on “Watchdog” fault | VCRC stopped executing control logic | ✅ High | Monitor board LEDs during startup. Watchdog timeout = processor hung. | Replace VCRC board. This is a critical failure — turbine cannot run. |
| Board boots but I/O packs show no data | Local expansion bus failure or mismatch | ⚠️ Medium | Check adjacent I/O pack status LEDs (TDBC, TDTO boards) | Verify VCRC firmware revision matches I/O pack firmware. Mismatch causes silent failure. |
| Intermittent resets during operation | Overheating or marginal power supply | ❌ Low | Measure +5V at backplane (must be 5.0V ±0.25V under load) | Add cooling fans. Replace rack power supply if voltage dips. |
| Board responds but control loops slow | Processor overload or VME bus contention | ⚠️ Medium | Check CPU load via Mark VI Toolbox (if available) | Reduce scan rate of non-critical logic. Replace with known-good VCRC to isolate. |
| Configuration lost after power cycle | Failed onboard battery or corrupted flash | ✅ High | Attempt to reload configuration from HMI backup | Battery not field-replaceable on this revision. Replace board. |
Still stuck? Capture the exact LED sequence at power-up (PASS, FAIL, RUN, STATUS). Take a photo of the board’s component side (especially any burned or bulging components). Email both to our tech support. We can compare against known-good behavior.
- IS200VCRCH1BBB
6. Frequently Asked Questions (FAQ)
Q1: Is the IS200VCRCH1BBB a direct replacement for my failed VCRC board?
Yes — if your existing board has the same functional revision (H1) and hardware revision (BBB or earlier). Check your board’s label. If you have an older revision (e.g., IS200VCRCH1BBA), this BBB revision works as a direct replacement. Do not mix with H2 functional revision — that requires different firmware.
Q2: Does this board come pre-programmed with my turbine’s control logic?
No. The board ships with generic GE factory test firmware. You must load your specific turbine application file (.bin or .hex) using the Mark VI Toolbox software and a serial or Ethernet connection to the VME rack. We cannot supply your turbine’s logic — that is plant-specific and stored in your HMI backup.
Q3: Can I hot-swap this board while the turbine is running?
Absolutely not. The Mark VI VME backplane is not designed for live insertion. Remove rack power completely. Wait 30 seconds for capacitors to discharge. Then swap boards. Reapply power. Hot-swapping can damage the backplane, the new board, or both. I’ve seen it take out three adjacent I/O packs in one shot.
Q4: Why is this board so expensive for an obsolete part?
Simple supply and demand. GE stopped producing Mark VI VCRC boards in 2018. Remaining new surplus stock is extremely limited. A turbine down for two weeks costs a plant 500,000+ in lost generation revenue. Paying X for a board that restarts the turbine today is cheap compared to that downtime.
Q5: What is the typical lead time?
In stock now in our Houston warehouse. Orders placed before 1 PM Central ship same day via UPS Next Day Air or FedEx Priority. International: 3-5 days via DHL Express. No backorder — what you see is what we have.
Q6: How do I verify this board is compatible with my Mark VI rack?
Check three things:
- Your rack backplane must be VME64 (standard for Mark VI)
- Your I/O pack firmware must match H1 functional revision
- Your application file must be compiled for 68040 processor
If you are replacing an existing VCRC board, match the functional revision (H1) and you are safe. Hardware revision (BBB) is upward compatible with BBA, BAA, etc.
Q7: What is the warranty period?
1 year from invoice. Coverage: defects in materials, manufacturing, or latent defects. Exclusions: lightning, water damage, incorrect power application, ESD damage, or attempted field repairs. If the board fails under normal operation, we cross-ship a replacement within 24 hours. You return the failed unit. No restocking fee on warranty claims.
Q8: Can I send you my failed VCRC board for repair?
We do not offer repair services for Mark VI boards. The multilayer VME boards with custom ASICs cannot be reliably repaired in the field. We sell only new surplus or tested refurbished replacements. If you have a repair house you trust, we can supply a replacement while yours is being repaired — but expect a 50% failure rate on repaired VCRC boards. New surplus is the safer path.
Q9: What ESD precautions should I take when handling this board?
This board has exposed edge connectors and surface-mount components. Use a grounded wrist strap and conductive mat. Handle only by the edges. Do not touch the backplane connectors (P1/P2). Store in the anti-static bag until installation. I once watched a tech destroy a $4,000 board by walking across a nylon carpet in dry winter air. Use the strap. Every time.
