Error CodecriticalPower Supply
F0002 DC bus overvoltage
In system: ABB Drive Faults
F0002 indicates dc bus overvoltage in ABB Drive Faults. Use this page to confirm root cause before replacement actions.
Technical Details
Fault ClassPower Supply
Default ReactionDrive trip and output inhibited
AcknowledgeAfter root cause correction and verification
Drive ObjectABB Drive Faults
Possible Causes
1Braking resistor not active
HIGH likelihoodValidate this cause with diagnostic values and wiring/mechanical inspection before replacing parts.
2Deceleration ramp too short
MEDIUM likelihoodValidate this cause with diagnostic values and wiring/mechanical inspection before replacing parts.
Step-by-Step Solution
1
Action 1
Check braking circuit
Details
- Record measured values before and after this action
2
Action 2
Increase deceleration time
Details
- Record measured values before and after this action
Diagnostic Parameters
| Parameter | Description | Value/Unit |
|---|---|---|
| r0056 | DC link voltage | Vdc |
| r0949 | Fault value | Code-specific |
Prevention Tips
Record baseline operating values after commissioning and compare during maintenance.
Review wiring torque, grounding, and cabinet conditions during planned shutdown.
Apply parameter change control to reduce repeat faults after service activities.
Frequently Asked Questions
Structured fault troubleshooting workflow for maintenance teams