Description
- Model: IS200STCIH6AED
- Brand: General Electric (GE)
- Series: Mark VIe
- Function: Simplex Contact Input Termination
- Capacity: Supports up to 24 discrete inputs
- Input Voltage: Typically 24 V DC (System excitation)
- Compatibility: Interfaces with the PDIA (Discrete Input) I/O Pack via a D-type connector.
- Signal Processing: Provides passive termination for 24 dry contact inputs.
- Excitation Power: Distributes 24 V DC excitation to field contacts to monitor state (Open/Closed).
- Protection: Integrated current-limiting resistors and noise filters on each channel to prevent “contact bounce” and EMI interference.
- Identification: Contains an onboard ID chip that allows the Mark VIe controller to automatically verify the hardware revision and serial number.
- Mechanical: Designed for compact mounting on a plastic standoff carrier or metal DIN-rail.
- Connector: 1x 37-pin D-type connector for direct mounting of the PDIA I/O pack.
GE IS200STCIH6AED
GE IS200STCIH6AED
Installation & Configuration Guide
Phase 1: Pre-Installation (Preparation)
⚠️ Critical Warning: The STCI board is often tied to “Trip” or “Permissive” logic. Removing it while the turbine is running can cause an unintended emergency shutdown (ESD).
- Logic Bypass: Check the ToolboxST software for any active forcing requirements before disconnecting.
- ESD Safety: Use an anti-static wrist strap. The ID chip and sensing resistors are susceptible to static damage.
Phase 2: Removal & Replacement
- Labeling: Mark each field wire leading to the terminal blocks.
- I/O Pack Extraction: Loosen the two side screws on the PDIA I/O pack and pull it straight off the D-connector of the STCI board.
- Board Removal: Unscrew the board from its mounting base.
- Inspection: Check the wiring for any signs of “wicking” or moisture damage that could cause a short circuit in the 24V excitation.
Phase 3: Commissioning
- Seat the Pack: Plug the PDIA pack into the new IS200STCIH6AED. Tighten the screws to ensures a solid electrical connection.
- Power-Up: The Mark VIe controller will automatically detect the new board via the ID chip.
- Signal Test: Use a multimeter or the HMI “Toggle” function to verify each of the 24 channels is reporting the correct status (0 or 1).
Customer Cases & Industry Applications
Case 1: Eliminating “Ghost” Alarms A power plant in Europe was plagued by intermittent “Contact Input Fault” alarms. After replacing the field switches to no avail, they discovered the terminal block on the original STCI board had developed high resistance due to chemical corrosion. Replacing the unit with a New Surplus IS200STCIH6AED provided clean, low-resistance contacts, immediately clearing all diagnostic alarms.
Case 2: Emergency Response During Outage During a scheduled C-Inspection, a technician accidentally cracked the D-connector on the existing STCI board. With the outage clock ticking, the plant couldn’t wait for factory lead times. We dispatched a New Surplus board within 24 hours. The “6AED” revision matched their system exactly, allowing for a seamless “Plug-and-Play” recovery without needing software modifications.
Frequently Asked Questions (FAQ)
Q: Can this board be used in a TMR (Triple Modular Redundant) system? A: No. The STCI is a Simplex board. For TMR systems, you would typically use the TBCI or STCI in a specific configuration, but the “S” in STCI specifically stands for Simplex.
Q: What is the difference between H1 and H6 revisions? A: The “H6” revision (like the STCIH6AED) is a higher-density or functionally updated version compared to earlier “H1” units. It often features improved filtering for higher-frequency electrical noise found in modern turbine enclosures.
Q: Does it include the PDIA I/O pack? A: No. The IS200STCIH6AED is the physical terminal board. The IS230PDIAH1A (or similar) I/O pack must be ordered separately or migrated from your old board.
Q: Why choose “New Surplus” over “Refurbished”? A: Termination boards are passive but critical. “Refurbished” boards often have stressed terminal screws that can strip easily or have hidden micro-cracks in the PCB traces. New Surplus ensures the physical and electrical integrity of the board is at 100% factory spec.
