A186 alarm in WEG CFW900 Drive indicates a Heatsink Fan Low Speed. This means a cooling fan is struggling to rotate at its rated speed, warning of dirt buildup or bearing wear.
Cause:
Heat sink fan low speed alarm.
- Dirt on the fan blades and rolling bearings.
- Defective fan.
- Defective fan power supply connection.
Remedy:
Clean fan blades and ensure bearing path is clear. Check connections.
