Welding Machine Middle Drive Card (ARC 200 / MMA Inverter 3-Card Board)

SKU: FA9B63E0-D486-4A0C-B48E-742E320653D1

a high-grade replacement Middle Drive & Auxiliary Power PCB Board specifically built for standard 3-Card / Multi-Card Inverter ARC 200, ARC 250, and MMA welding machines. It bridges the control logic with the main switching power section, ensuring clean gate-pulse isolation and transient snubber protection. Key Components & Specifications: - Model Identifier: RTM-01-A4 (Standard 3-Card Inverter Series). - Pulse Drive Section: Integrated center ferrite pulse transformer providing balanced, isolated gate drive waveforms to protect power MOSFETs/IGBTs from destructive spikes. - Snubber Protection: Equipped with 4x heavy-duty 5W 47 Ohm (KW 5W 47RJ) ceramic wirewound resistors and high-voltage snubber film capacitors to absorb inductive flyback pulses. - Auxiliary Power Stage: Built-in step-down high-frequency auxiliary transformer circuit delivering stabilized operating voltages. - Vertical Logic Card: Complete sub-card module fitted with signal shaping and drive amplifier stages. - Heavy FR-4 Construction: Thick copper tracks engineered to handle continuous high-duty industrial welding cycles. Common Repair Symptoms: - Machine powers ON (fan running) but NO welding output arc is generated. - Repeated MOSFET/IGBT failure upon striking arc due to distorted gate drive. - Burning/overheating marks on 5W 47R ceramic resistors or drive transformer.