Description
Product Introduction
The GE IS200VTURH2BAC is a 6U VME turbine protection processor board for Speedtronic Mark VI cabinets. It takes raw magnetic pickup speed pulses, flame detector signals, and shaft voltage/current inputs, then executes the overspeed and flame-loss trip logic that drives emergency trip relays.
This board sits in the safety chain, not the control loop. A hardware fault can cause a spurious trip or—worse—a missed protection action . That changes how you source it. Do not accept a board based on a visual match alone. The “BAC” suffix carries conformal coating for dust and moisture resistance, and the H2 revision defines the VME backplane interface. Match the full part number. Confirm the associated terminal boards—TTUR or DTUR—are compatible with the revision you buy .
Installation & Configuration Guide
Phase 1 — Pre-Installation (est. 15 min). De-energize the Mark VI rack. Wait five minutes. Photograph the existing board’s slot position, front-panel cable connectors, and nameplate. Export the protection configuration if ToolboxST or the site service tool is available. You need an ESD wrist strap, anti-static mat, and the Mark VI wiring diagram showing TTUR/DTUR terminations.
Phase 2 — Removal (est. 8 min). Label every front-panel cable at the VTUR board. Release the panel locking screws. Pull the board straight out of the VME slot. ❗ Hot-swap is forbidden. Cut rack power before removal—this board drives trip relay outputs, and pulling it live can drop the protection circuit . Inspect the VME backplane connector for bent pins.
Phase 3 — Installation (est. 10 min). ESD strap on. Verify the replacement label reads IS200VTURH2BAC—not a sibling VTUR revision. Confirm the associated TTUR/DTUR terminal board part numbers match the new board’s compatibility requirements. Seat the board firmly in the designated VME slot. Secure the panel screws. Reconnect all multi-pin front cables until they lock. Verify no loose contacts.
Phase 4 — Power-On & Testing (est. 30 min). Apply rack power. Observe LEDs: green = supply normal, yellow = VME communication active, red = protection channel fault . Verify the speed reading against a known reference if the turbine is turning gear. With the unit offline, simulate an overspeed condition and a flame-loss condition through the protection loop. ❗ Full protection-loop simulation is mandatory before return to service. Confirm all three Form-C trip relays operate the correct trip solenoids. Log the board serial number, LED status, and test results.
Troubleshooting quick-reference:
- Board not recognized → Check VME slot seating, backplane power, and revision compatibility.
- Incorrect speed reading → Inspect MPU sensor gap, shielded twisted-pair wiring, and shield grounding at the dedicated terminal .
- Red LED on → Protection channel fault. Read diagnostics through the Mark VI maintenance tool before pulling the board.
