Scope of this technical record
F0002 overvoltage routing for MICROMASTER drives, prioritising deceleration energy, OFF3 ramp, load inertia and brake/DC-link evidence before board replacement.
Treat the DC link as hazardous. Overvoltage events can involve stored energy and regeneration; verify discharge before access.
Why F0002 is often an application-energy problem
A F0002 report during deceleration usually asks whether the machine is returning more energy to the DC link than the drive can manage. For fan and pump work, this means looking at inertia, stop command, ramp time, valve/damper behaviour and any braking option before suspecting the control board.
If F0002 appears at idle or power-up, the route changes. High line voltage, bus measurement, capacitor condition or internal DC-link sensing becomes more relevant. The same code therefore needs a timing map.
F0002 timing split
| Observed behaviour | First suspect area | What confirms the route |
|---|---|---|
| Only during normal stop | Decel ramp and inertia | Longer ramp or load change prevents the trip |
| During OFF3 fast stop | Fast-stop ramp energy | P1135/stop-mode evidence matches trip timing |
| At idle/power-up | High line or bus sensing | Input/DC-link evidence abnormal without regeneration |
| After braking hardware change | Brake resistor/chopper/wiring | Brake path evidence is open, misrated or not switching |
Field record checklist
- Stop mode
- Deceleration/OFF3 ramp
- Load inertia
- Input voltage
- Brake resistor/chopper evidence
- DC-link reading
- Fault history
Technical basis and reference documents
This is an independent editorial technical reference. Original manufacturer documentation remains controlling for installation, repair and commissioning decisions.
Public Siemens documentation links too-short ramp-down time to A0502/F0002 behaviour.