The **VS2-CAA-R** is a specific configuration of the **Vicor MegaPAC (Westcor)** series. This is a high-density, field-configurable AC-DC power supply. The part number corresponds to a modular system built using Vicor’s DC-DC converter modules (VI-200 or VI-J00 series). --- ## 1. Part Number Breakdown The alphanumeric code describes the chassis type and the specific output modules installed in the slots. | Segment | Meaning | Description | | :--- | :--- | :--- | | **VS2** | Chassis Series | MegaPAC (Dual Phase / High Power Chassis) | | **C** | Slot 1 Module | Typically a 15V or specific voltage Vicor module | | **A** | Slot 2 Module | Typically a 5V Vicor module | | **A** | Slot 3 Module | Typically a 5V Vicor module | | **R** | Configuration/Option | Often denotes RoHS compliance or specific revision/cooling | --- ## 2. Key Electronic Components & Subsystems The VS2-CAA-R is composed of several critical electronic stages: ### A. Input Front-End (Chassis) * **EMI Filter:** High-performance line filters to reduce conducted emissions. * **Bridge Rectifier:** Converts incoming AC (115/230VAC) to a high-voltage DC bus. * **Power Factor Correction (PFC):** Most MegaPAC units include active PFC to ensure current is drawn in phase with the voltage, maximizing efficiency. ### B. Output Modules (The "CAA" portion) The unit uses **Vicor VI-200/VI-J00** modules. These are the "bricks" inside the box: * **Zero-Current Switching (ZCS):** Unlike standard PWM power supplies, these modules use ZCS topology. This minimizes switching losses and allows for high frequency (MHz range) operation. * **Isolation Transformers:** High-frequency planar transformers provide galvanic isolation between input and output. * **Feedback Loop:** Each module (C, A, and A) has its own independent regulation loop, allowing for precise voltage control even under varying loads. ### C. Control & Protection Circuits * **Remote Sense:** Terminals to compensate for voltage drops across long output wires. * **Output Trim:** Internal potentiometers or external resistors can adjust the output voltage (usually $\pm 10\%$). * **Protective Features:** * **OVP (Over Voltage Protection):** Latches the unit off if the output exceeds safety limits. * **OTP (Over Temperature Protection):** Thermal sensors on the baseplate shut down the modules if cooling fails. --- ## 3. Electrical Specifications (General) | Feature | Specification | | :--- | :--- | | **Input Voltage** | 85-264 VAC (Universal) or 115/230 Selectable | | **Total Power** | Typically 600W to 1200W depending on cooling | | **Cooling** | Internal DC Fan | | **Efficiency** | 80% - 90% (depending on module load) | --- ## 4. Usage Warning Because the **VS2-CAA-R** is a modular supply, the "C" and "A" designations refer to specific pre-configured voltages defined in the Vicor catalog. * **A** usually denotes **5V**. * **C** usually denotes **15V**. * **Always verify the label on the physical unit**, as these can be customized by the factory for specific industrial clients.