Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-120 minutes

Alarm 300786

Siemens 300786 - Axis drive field weakening speed invalid

The value in MD 1142: $MD_FIELD_WEAKENING_SPEED (threshold speed for field weakening) is less than or equal to zero. The alarm can be reprogrammed in the MD ALARM_REACTION_CHAN_NOREADY (channel not ready) Control reaction: NC not ready. The NC switches to follow-up mode. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Channel not ready.

Siemens SINUMERIKServo/AxisIntermediate30-120 minutes

300786

Siemens 300786 - Axis drive field weakening speed invalid

Axis drive field weakening speed invalid

The value in MD 1142: $MD_FIELD_WEAKENING_SPEED (threshold speed for field weakening) is less than or equal to zero. The alarm can be reprogrammed in the MD ALARM_REACTION_CHAN_NOREADY (channel not ready) Control reaction: NC not ready. The NC switches to follow-up mode. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Channel not ready.

Safety

  • Drive/power/encoder circuit: hazardous voltages may remain in the DC link after power-off. Lock out / tag out, wait for discharge per the drive documentation, and use qualified personnel only.

Common Causes

  • The value in MD 1142: $MD_FIELD_WEAKENING_SPEED (threshold speed for field weakening) is less than or equal to zero.
  • The alarm can be reprogrammed in the MD ALARM_REACTION_CHAN_NOREADY (channel not ready)

Troubleshooting Steps

  1. 1Please inform the authorized personnel/service department.
  2. 2For standard motors: Reset the drive (delete the bootfile) and repeat the startup.
  3. 3For third-party motors: Check and, if necessary, refer to the motor data sheet to correct MD 1142: $MD_FIELD_WEAKENING_SPEED (threshold speed for field weakening).
  4. 4Clear alarm with the RESET key in all channels. Restart part program

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