Fault:
Alarm 20000 (Channel 1 axis WZM reference cam not reached)
Remedy:
The alarm can be generally understood as the tool magazine failed to return to reference point (for details see SINUMERIK 840D/840Di/810D/FM-NC Description of Functions Basic Machine，FB1，Reference Point Approach). It’s easy to find problems with a roughly check to the reference point device. In this case, the broken connection was found to the proximity switch S32.3. And the alarm disappeared after welding.
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