What causes Siemens SINUMERIK alarm 101166?

Part program contains an illegal or unsupported command for the current machine configuration. Parameter or machine data setting incompatible with the commanded operation. Required option or function not enabled on this SINUMERIK control. Incorrect axis assignment or configuration for the commanded function. Software version or compile cycle version mismatch.

How do I fix Siemens SINUMERIK alarm 101166?

1. Note the full alarm message including any parameter values shown (e.g., axis number, block number, channel). 2. Identify the program block or operation that triggered the alarm. 3. Review the SINUMERIK alarm manual for alarm 101166 to identify the specific cause and remedy. 4. Check the relevant machine data parameters referenced in the alarm. 5. If the alarm persists after correcting the program, contact Siemens technical support with the full alarm text and machine data backup.

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Siemens SINUMERIK Controller

Program/G-code · Intermediate · 30-120 minutes

Alarm 101166

Siemens 840D 101166 - MDx129 POWER_FACTOR_COS_PHI illegal

Alarm 101166 indicates that the power factor value (cos phi) configured in machine data MD129 POWER_FACTOR_COS_PHI is outside the permissible range or contains an invalid value. This parameter defines the power factor for power calculation in the drive system and must be between 0.0 and 1.0. The alarm is triggered during power-up or when machine data is activated.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

101166

Siemens 840D 101166 - MDx129 POWER_FACTOR_COS_PHI illegal

MDx129 POWER_FACTOR_COS_PHI illegal

Root Cause Summary

Alarm 101166 indicates that the power factor value (cos phi) configured in machine data MD129 POWER_FACTOR_COS_PHI is outside the permissible range or contains an invalid value. This parameter defines the power factor for power calculation in the drive system and must be between 0.0 and 1.0. The alarm is triggered during power-up or when machine data is activated.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Access machine data in service mode and navigate to MD129 POWER_FACTOR_COS_PHI for the affected axis/spindle.
2
Check the current value. Valid range is 0.0 to 1.0. Typical values are 0.85 to 0.95 for most industrial drives.
3
Correct the value to a valid power factor (recommend 0.9 as default if manufacturer specification is unknown).
Document original value before changing for OEM reference
4
Perform a power cycle (NCK reset) to activate the new machine data and clear the alarm.

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