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The GE IS200BICLH1BAA is a highly specific Printed Circuit Board (PCB) known as the IGBT Drive/Source Bridge Interface Board (1$\text{BICL}$).2 It is an essential component in General Electric’s Drive Control Series, which is integrated with the Mark VI Speedtronic Turbine Control System.
Its primary function is to serve as the critical communication, protection, and monitoring bridge between the main, low-voltage control processor and the high-power IGBTs (Insulated Gate Bipolar Transistors) in large industrial motor drives or power converters.
⚙️ Core Functionality and Features
The $\text{BICL}$ board ensures the accurate, high-speed control and thermal protection of the drive’s power stack. The H1BAA suffix denotes a specific functional and artwork revision, which is crucial for compatibility.
Key Protective and Control Functions:
- Fault String Monitoring: The board is essential for safety, monitoring two dedicated fault string inputs ($\text{LOCFLT}$ and $\text{SYSFLT}$) from external interlock contacts. Breaking a fault string initiates a controlled shutdown by disabling bridge firing and dropping out the main contactors ($\text{MA}$ and $\text{MB}$).
- Watchdog Circuit: A dedicated watchdog circuit monitors the board’s internal clock. If the clock fails while the drive is operating, the watchdog removes power to the IGBT drivers within 30 microseconds to prevent catastrophic failure.
- Temperature Monitoring: It uses four RTD (Resistance Temperature Detector) inputs to monitor both the bridge temperature and the ambient temperature for dynamic thermal management.3
- Auxiliary Control: Includes a PWM (Pulse Width Modulated) Fan Speed Output to dynamically control cooling fans based on measured temperatures.
- Contactor Control: It manages the pilot relays for the main contactors and includes a Contactor Sense Input to verify that the main contactor is active before enabling bridge firing, adding a critical safety interlock.
🛠️ Technical Details and Installation
The IS200BICLH1BAA is a VME-style board designed to be installed in a specific slot within the control rack.4
| Parameter | Detail |
| Functional Acronym | BICL (Bridge Interface Control Board) |
| System Family | GE Mark VI Speedtronic / Innovation Series Drive Control. |
| Mounting Slot | VME Slot 5 Only. (Installing in any other slot can cause damage.) |
| Revision | H1BAA—A later functional revision, requiring exact revision matching for replacement. |
| Relays | Built with four relays for contactor and other control functions. |
| Logic | Implemented in an EPLD (Electronically Programmable Logic Device). |
⚠️ Important Considerations for Replacement
- Slot Restriction is Mandatory: You must install this board into VME Slot 5 as specified by GE documentation.
- Revision Match is Crucial: The H1BAA suffix must be matched exactly when sourcing a replacement due to the high-speed, safety-critical nature of the drive control logic and the specific configuration of the onboard EPLD.
- Safety Hazard: This board operates in the high-voltage section of the drive. Strict Lockout/Tagout (LOTO) procedures must be followed before handling the board.
