Investigation sequence
Identify module topology
Record whether the rectifier and inverter are combined in one PIM/IPM package and capture exact markings before making an economic decision.
Test sections separately
Compare input diode/rectifier measurements with output transistor measurements; do not infer the whole package condition from one terminal group.
Find why the rectifier failed
Check surge path, varistors, precharge, input contactor, fuses and DC capacitors before any replacement strategy.
Assess remaining inverter trust
If the inverter section has ambiguous leakage, heat history or previous output faults, a partial strategy may not be responsible.
Choose the commercial route
Document whether the result supports full module replacement, specialist repair, drive replacement or modernization.
Stop conditions
- Output section has leakage or short evidence
- DC link capacitors are suspect
- Line-side surge cause is unresolved
- Exact module identity is uncertain
Linked records
This page serves users who are comparing a full module replacement with a controlled repair strategy. The database does not publish a universal modification recipe; it records the evidence needed to decide whether rectifier-only damage is plausible and whether the remaining inverter stage can be trusted.
A public safety-oriented map of why experienced repair benches reduce stored energy and use controlled load evidence before proving an output stage after destructive module repair.