IndustrialDriveDataDrive Board & Diagnostic Database
Board-level repair evidence

Fuji FRENIC G9/G11 Gate-Driver Small-Capacitor Evidence Record

Captures the evidence needed when a tiny driver-side capacitor, optocoupler or gate component causes repeat module failure without obvious burn marks.

Record status

IdentifierRepair experience pattern; exact board revision required before any parts decision
Record typeBoard-level repair evidence

Observed functional elements

Small capacitors near gate driveOptocouplersGate resistorsZener clampsDriver supply railsAffected module channel

Diagnostic use

  • For repeat-failure cases after module replacement
  • For comparing channel leakage and gate waveform symmetry
  • For deciding whether a module purchase is premature

Linked circuit records

Circuit
Fuji FRENIC G9/G11 Gate-Drive Leakage and Repeat-Failure Path

Maps the service-decision path for repeated Fuji G9/G11 module failures: PWM command, optocoupler/driver output, small capacitor leakage, zener/gate resistor condition, module input capacitance and motor/load evidence.

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Evidence intake

Turn this record into a qualified service request

A repair decision is much more reliable when the request includes the exact identity of the drive, the first fault evidence and the machine condition when the symptom appeared.

  • Complete drive type code / MLFB or nameplate model
  • Fault code, fault value and first event before reset
  • When the event appears: power-up, enable, ramp, run, decel or stop
  • Motor/cable connected or isolated during the symptom
  • Visible board, option-card, module and connector identifiers
  • Previous repair history, replacement parts and repeat-failure pattern
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