An IGBT Stack (also called Power Stack or IGBT Module Assembly) is the core high-power component inside Siemens AC Drives such as SINAMICS S120, G120, and legacy MASTERDRIVES.
It includes:
The stack converts DC bus voltage into variable-frequency AC to control motor speed and torque.
| Step | Description |
|---|---|
| 1. Teardown | Remove stack from drive, disassemble heatsink, busbars, modules. |
| 2. Failure Analysis | Test IGBTs, diodes, drivers, capacitors using curve tracers & thermal imaging. |
| 3. Component Replacement | Replace failed IGBTs (e.g., FS450R12KE3), gate ICs, or capacitors. |
| 4. Rebuild & Thermal Paste | Apply high-performance thermal compound, torque bolts to spec. |
| 5. Dynamic Testing | Full-load simulation on test rig; verify waveforms and protection. |
| 6. Final Validation | Reload firmware, recalibrate sensors, issue test & warranty. |
Typical Turnaround: 3–7 days | Rush: 24–48 hrs
Warranty: 12–24 months on repaired stack
Immediate delivery of ready-to-install IGBT stacks (new or refurbished):
Siemens original parts (e.g., 6SL3330-7TE35-0AA3). High cost, 2–12 week lead time.
Tested to OEM spec by certified partners. 50–70% cheaper, 1–3 day delivery.
Send failed stack → receive tested spare → return core. Minimizes downtime.
| Drive Series | Stack / Module Example | Typical Failure |
|---|---|---|
| SINAMICS S120 | 6SL3330-7TE35-0AA3 | IGBT short, capacitor dry-out |
| SINAMICS G120 | FSD 15 kW stack | Gate driver IC burnout |
| MASTERDRIVES 6SE70 | 6SE7031-2HF60-Z | Diode module failure |
| Benefit | Repair | Spare Supply |
|---|---|---|
| Cost | 40–60% of new | 50–70% of new |
| Downtime | 3–7 days | <24 hrs (exchange) |
| Sustainability | Reuses components | Core return programs |
Official OEM repair & spare parts with full warranty.
Fast exchange, 24-hr rush repair, SINAMICS experts.
ISO-certified stack rebuild and testing.
