ACVV Regulator MKII – Thyristor fuse blows immediately after machine has started

November 15th, 2022 / Updated: March 28th, 2023
  1. Possible short circuit or earth fault. (Disconnect U V W and check wiring also check motor for fault)
  2. HF2 -HF3 Blown (suspect Diode or Thyristor in DC bridge circuit short circuit)
  3. HF1-HF2-HF3 Blown (suspect faulty Thyristor/s between R-U, S-V or T-W)