How do I fix Siemens SINUMERIK alarm 300769?

1. Please inform the authorized personnel/service department. 2. The bandwidth denominator of a current or speed setpoint filter must be less than twice the natural frequency. 3. Speed setpoint filter 1: - MD 1515 <= 2 * MD 1514 * 0.01 * MD 1520 - Speed setpoint filter 2: - MD 1518 <= 2 * MD 1517 * 0.01 * MD 1521 - Current setpoint filter 1: - MD 1211 <= 2 * MD 1210 - Current setpoint filter 2: - MD 1214 <= 2 * MD 1213 - Current setpoint filter 3: - MD 1217 <= 2 * MD 1216 - Current setpoint filter 4: - MD 1220 <= 2 * MD 1219 - Modify MD 1515: $MD_SPEED_FILTER_1_BANDWIDTH (bandwidth speed setpoint filter 1) - Modify MD 1514: $MD_SPEED_FILTER_1_SUPPR_FREQ (suppression frequency speed setpoint filter 1) - Modify MD 1520: $MD_SPEED_FILTER_1_BS_FREQ (bandstop filter natural frequency speed setpoint filter 1) - Modify MD 1518: $MD_SPEED_FILTER_2_BANDWIDTH (bandwidth speed setpoint filter 2) - Modify MD 1517: $MD_SPEED_FILTER_2_SUPPR_FREQ (suppression frequency speed setpoint filter 2) - Modify MD 1521: $MD_SPEED_FILTER_2_BS_FREQ (bandstop filter natural frequency speed setpoint filter 2) - Modify MD 1211: $MD_CURRENT_FILTER_1_BANDWIDTH (bandwidth current setpoint filter 1) - Modify MD 1210: $MD_CURRENT_FILTER_1_SUPPR_FREQ (suppression frequency current setpoint filter 1) - Modify MD 1214: $MD_CURRENT_FILTER_2_BANDWIDTH (bandwidth speed setpoint filter 2) 2) - Modify MD 1213: $MD_CURRENT_FILTER_2_SUPPR_FREQ (suppression frequency current setpoint filter 2) - Modify MD 1217: $MD_CURRENT_FILTER_3_BANDWIDTH (bandwidth speed setpoint filter 3) 3) 2-751

Siemens SINUMERIK codes

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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-120 minutes

Alarm 300769

Siemens 300769 - Axis drive denominator bandwidth > double natural frequency

This alarm occurs when the bandwidth denominator of a current or speed setpoint filter exceeds twice the natural frequency due to incorrect machine data settings. Adjust the relevant MD parameters to resolve.

Siemens SINUMERIKServo/AxisIntermediate30-120 minutes

300769

Siemens 300769 - Axis drive denominator bandwidth > double natural frequency

Axis drive denominator bandwidth > double natural frequency

The bandwidth denominator of a current or speed setpoint filter is greater than twice the natural frequency. This error message is only issued for the general bandstop filter if: - Speed setpoint filter 1: - MD 1516 > 0.0 or - MD 1520 <> 100.0 - Speed setpoint filter 2: - MD 1519 > 0.0 or - MD 1521 <> 100.0 - Current setpoint filter 1: - MD 1212 > 0.0 - Current setpoint filter 2: - MD 1215 > 0.0 - Current setpoint filter 3: - MD 1218 > 0.0 - Current setpoint filter 4: - MD 1221 > 0.0 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.

Root Cause Summary

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
Check MD Parameters
Review MD 1516, 1519, 1520, and 1521 for the affected axis and drive.
2
Adjust Values
Ensure bandwidth denominator values are less than twice the natural frequency. Adjust as needed.
3
Reset and Test
Clear the alarm, reset the control, and test the program or axis movement.

DIY Feasiblehigh confidence

Call a technician if:

·If MD adjustments do not resolve the alarm
·If unsure about correct MD values for the machine

Prevention

Document MD changes during setup
Validate MD settings against machine manual before operation
Ensure only qualified personnel modify machine data parameters
Implement change control procedures for critical parameters

Common Mistakes

Overlooking specific MD parameter limits
Failing to reset control after MD changes

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