Sinumerik Alarm 2120 NCK fan alarm
The fan consists of a 26VDC motor with electronic commutator (rated speed: approx. 8700rpm).The commutator signal is used for speed monitoring, response speed: < 7500rpm.
– Alarm display.
Please inform the authorized personnel/service department.The unit with the fan and NCK battery must be replaced.
Clear alarm with the Delete key or NC START.
- Siemens Diagnostics Guide by Siemens