81
Start condition
SEW Eurodrive · MCBSM
What does 81 mean?
Immediate switch-off with inhibit, specifically in "VFC hoist" operating mode. The motor could not be supplied with the correct current during pre-magnetizing time, possibly due to rated motor power being too small for the inverter or undersized motor cables. This prevents proper motor startup and can stress the inverter.
Common Causes
- The drive cannot enter a run state due to unmet conditions.
- Safety interlock circuits not enabled (e.g., P0-26).
- Required command signal not present (e.g., enable input).
- Fault or warning status preventing startup.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Check the connection between the inverter and the motor, ensuring all phases are securely connected.
- 2
Check startup data and perform a new startup if necessary, verifying the rated motor power and other motor parameters.
- 3
Check the cross-section of the motor cable and increase it if necessary to ensure adequate current delivery without excessive voltage drop.
Verified technical data. Last updated: March 2026
Related Faults
Source: SEW Eurodrive MCBSM