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The GE IS200BICLH1AFE 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.3
This board acts as the high-speed communication and protection bridge between the low-voltage control logic of the main processor and the high-power IGBTs (Insulated Gate Bipolar Transistors) in large industrial motor drives or power converters.4
⚙️ Core Functionality and Protection Features
The $\text{BICL}$ board’s role is to ensure precise, high-speed control and comprehensive protection for the drive’s power stack. Control logic on the board is implemented in an EPLD (Electronically Programmable Logic Device) configured by the main control board (5$\text{CPU}$).6
Key Protection and Monitoring Functions:
| Feature | Description |
| Fault String Inputs | The board monitors two dedicated fault string inputs: one for the Panel Series String of Interlock Contacts ($\text{LOCFLT}$) and one for the System String ($\text{SYSFLT}$). Breaking either string initiates a controlled drive shutdown and disables bridge firing. |
| Contactor Control | It manages the pilot relays for the MA and MB main contactors. The fault strings are hardware $\text{ANDed}$ to provide a master enable. If a fault string is broken while the drive is running, bridge firing is disabled before the contactors drop out, ensuring a safe sequence. |
| Watchdog ($\text{WD}$) Circuit | A watchdog circuit monitors the $\text{20 Mhz}$ clock signal to the $\text{EPLD}$. If the clock fails, bridge firing is disabled, and the $\text{MA}$ and $\text{MB}$ contactors drop out. If a clock failure occurs while the bridge is firing, power to the IGBT drivers is removed within 30 microseconds. |
| Temperature Monitoring | It uses four RTD (Resistance Temperature Detector) inputs to monitor both the bridge temperature and the ambient temperature for thermal protection and fan speed control. |
| Contactor Sense | An MA Sense Input ($\text{MASEN}$) is provided to monitor an interlock on the main contactor, inhibiting bridge firing if the main contactor does not pick up when commanded, providing an extra layer of safety. |
🛠️ Technical Details
The IS200BICLH1AFE is a VME-style board with a specific mounting requirement.7
| 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. (Incorrect slot installation can cause damage.) |
| Revision | H1AFE—The suffix specifies the precise functional and artwork revisions. Exact revision matching is critical for replacement due to the high-speed, safety-critical nature of the drive control logic. |
| Auxiliary Output | Includes a PWM (Pulse Width Modulated) Fan Speed Output to control cooling fans dynamically. |
This video discusses the process of fixing control board problems in a different GE appliance, which illustrates the general principle of maintaining power electronics boards like the $\text{BICL}$
