Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-120 minutes

Alarm 300726

Siemens 300726 - Axis drive voltage constant is zero

The value in drive MD 1114: $MD_EMF_VOLTAGE is set to zero 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.

Siemens SINUMERIKServo/AxisIntermediate30-120 minutes

300726

Siemens 300726 - Axis drive voltage constant is zero

Axis drive voltage constant is zero

The value in drive MD 1114: $MD_EMF_VOLTAGE is set to zero 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.

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 drive MD 1114: $MD_EMF_VOLTAGE is set to zero

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 1114: $MD_EMF_VOLTAGE (voltage constant).
  4. 4Switch control OFF - ON

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