Sinumerik Alarm 300100 Drive power failure

Sinumerik Alarm 300100 Drive power failure

In one or several (all) drive modules, there is a power failure although power was previously available. (The timeout is checked for write/read accesses. Timeouts are interpreted as power failure because this is the most probable case. The test takes place in the cyclic mode only but not at system power-up.) Since the drives in the SINUMERIK 840D and the NC-CPU have the same power supply, this error does not occur here because then the NCU is also without power supply. In the SINUMERIK FM-NC, this error can arise because the power supply is separate.

– NC not ready.
– Channel not ready.
– NC Stop on alarm.
– NC Start disable in this channel.
– The NC switches to follow-up mode.
– Alarm display.
– Interface signals are set.

Switch off the power to the system and switch on again – the drives start up again.

Program Continuation:
Clear alarm with the RESET key in all channels. Restart part program.


  1. Siemens Diagnostics Guide by Siemens
Sinumerik Alarm 300100 Drive power failure