Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-120 minutes

Alarm 300733

Siemens 300733 - Axis drive zero load voltage invalid

This alarm is triggered by an invalid motor no-load voltage configuration in MD 1135, often due to incorrect parameter settings or values outside acceptable limits. Correct the machine data parameters to resolve it.

Siemens SINUMERIKServo/AxisIntermediate30-120 minutes

300733

Siemens 300733 - Axis drive zero load voltage invalid

Axis drive zero load voltage invalid

Error in the no-load voltage (MD 1135): - MD 1135 <= 0 or - MD 1135 > MD 1132 or - MD 1135 x MD 1142/MD 1400 + Uvor > 450V. Where Uvor = 0.181 x MD 1136 x MD 1142 x MD 1119 - Modify MD 1135: $MD_MOTOR_NOLOAD_VOLTAGE (motor no-load voltage) - Modify MD 1132: $MD_MOTOR_NOMINAL_VOLTAGE (rated motor voltage) - Modify MD 1400: $MD_MOTOR_RATED_SPEED (rated motor speed) - Modify MD 1142: $MD_FIELD_WEAKENING_SPEED (threshold speed for field weakening) - Modify MD 1136: $MD_MOTOR_NOLOAD_CURRENT (motor no-load current) - Modify MD 1119: $MD_SERIES_INDUCTANCE (series reactor inductance) 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.

Root Cause Summary

This alarm is triggered by an invalid motor no-load voltage configuration in MD 1135, often due to incorrect parameter settings or values outside acceptable limits. Correct the machine data parameters to resolve it.

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.

Causes and Fixes

  1. 1

    Check MD 1135 Value

    Access machine data and verify MD 1135 (motor no-load voltage) against documentation limits.

  2. 2

    Validate Related Parameters

    Ensure MD 1135 ≤ MD 1132 and calculate if MD 1135 x MD 1142/MD 1400 + Uvor ≤ 450V.

  3. 3

    Adjust and Test

    Modify MD 1135 or related parameters (MD 1132, 1136, 1142, etc.), save changes, and restart the system.

DIY Feasiblehigh confidence

Call a technician if:

  • ·If alarm persists after correcting machine data
  • ·If unsure about correct parameter values for the motor

Prevention

  • Always follow LOTO procedures before parameter changes
  • Always validate machine data against motor specifications before changes
  • Document parameter adjustments for future reference
  • Maintain backup copies of working parameter sets

Common Mistakes

  • Overlooking related MD parameters in voltage calculation
  • Entering values without cross-checking limits

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