Siemens Sinamics S120 Fault Codes

14.06.2023

Sinamics S120 converters are designed by Siemens as a drive, modular system, providing high performance and flexibility in industrial applications. But no equipment lasts forever and unforeseen situations can happen during its use. Today we will look at Sinamics S120 fault codes.

Common Fault Codes in Sinamics S120 and their Meanings

During operation, Sinamics S120 errors may occur incompatible with the machine's performance. As a rule, failures in the functioning of machines are accompanied by error messages. Sinamics S120 error codes are organized into numerical ranges:

  • 01000-02999: Control unit;
  • 03000-04999: Reserved;
  • 05000-05999: Power supply;siemens s120 fault codes
  • 06000-06999: Feed unit;
  • 07000-07999: Drive;
  • 08000-08999: Option board;
  • 09000-29999: Reserved;
  • 30000-30999: DRIVE-CLiQ component power section;
  • 31000-31999: DRIVE-CLiQ component encoder 1;
  • 32000-32999: DRIVE-CLiQ component encoder 2;
  • 33000-33999: DRIVE-CLiQ component encoder 3;
  • 34000-34999: Reserved;
  • 35000-35999: Terminal Module 31;
  • 36000-49999: Reserved;
  • 50000-50399: Communication Board (COMM BOARD);
  • 50400-65535: Reserved.

Troubleshooting Tips for Sinamics S120 Fault Codes

The following are possible Sinamics S120 errors and how to fix them.

  • F06010 Infeed: Power unit EP 24 V missing in operation. Error in the power supply, the problem is that it does not issue an enable signal.
  • F06300 Infeed: Line voltage too high at power on. Mains voltage is too high. An error has occurred in the power supply.Siemens Sinamics s120 error codes
  • F07410 Drive: Current controller output limited. Error in actual current measurement. Possible causes: Faulty drive, faulty motor.
  • F07412 Drive: Commutation angle incorrect (motor model). Motor shaft movement is different than expected. The drive or motor may be defective. There is a possibility that the encoder is faulty or not configured
  • F07413 Drive: Commutation angle incorrect (pole position identification). The movement of the motor shaft differs from the expected by more than 45 degrees. The drive or motor may be defective. And also, the encoder may be faulty or not configured.
  • F07452 (A) LR: The following error is too high. Difference between the set value and the actual value of the motor shaft position. It is necessary to diagnose the electric motor or repair the SIEMENS SINAMICS S120 converter.
  • F07453 LR: Position actual value conditioning error. Error processing the current position value. The encoder may be defective. The encoder needs to be diagnosed or repaired.
  • F07490 EPOS: Enable signal withdrawn while traversing. The drive is in the "switch on inhibit" state (standard application). Check all enable signals.
  • F07900 (N, A) Drive: Motor locked/speed controller at its limit. The motor has been running at the torque limit for longer than specified in p2177 and below the speed threshold set in p2175. Check the inversion of the actual value. Check the motor encoder connection.
  • F07901 Drive: Motor overspeed. The maximum allowable motor speed has been exceeded. Permissible thresholds can be configured in the parameters. There may be a fault in the SIMOTICS S drive or motor.
  • F07902 (N, A) Drive: Motor stalled. The error code means that the engine has stopped. This could be due to incorrect parameterization or motor failure, possibly a problem with the SINAMICS S120 power board.
  • F30002 Power unit: DC link overvoltage. Exceeding the allowable voltage of the DC link. Check the mains voltage and the correct connection of the input phases. If the motor regenerates too much energy, check the braking resistor.
  • F30003 Power unit: DC link undervoltage. The DC link voltage is too low. It is necessary to check the mains voltage and the correct phasing of the terminals. There may be a problem with the feed module. Infeed Module diagnostic required.
  • F30004 Power unit: Overtemperature heatsink AC inverter. The temperature of the power supply heat sink has exceeded the allowable value. It is necessary to check the cooling system, the fan may have failed. It is also necessary to check the motor load (mechanical part).
  • F30021 Power unit: Ground fault. A ground fault has occurred. The power cables and motor windings should be checked. For example, ring the case with a megohmmeter.
  • A30031 Power unit: Hardware current limiting, phase U. Hardware current limiting. Phase "U". The hardware current limit for this phase has been reached. Check the encoder position, motor cables, and motor load.
  • A30032 Power unit: Hardware current limiting, phase V. Hardware current limiting. Phase "V". The hardware current limit for this phase has been reached. Check the encoder position, motor cables, and motor load.
  • A30033 Power unit: Hardware current limiting, phase W. Hardware current limiting. Phase "W". The hardware current limit for this phase has been reached. Check the encoder position, motor cables, and motor load.
  • F30035 Power unit: Air intake overtemperature. Overheat. The air temperature at the inlet to the power supply has exceeded the allowable limit. For air-cooled powerplants, the limit is 55 degrees Celsius. Check if the ambient temperature is within the acceptable range.
  • F30040 Power unit: Undervolt 24 V. 24 V power supply failure. The 16 Volt threshold has fallen below 3 ms. Check the 24 VDC supply voltage on the power supply.
  • F30045 Power unit: Supply undervoltage. Reduced supply voltage. The voltage monitoring on the DAC board signals an undervoltage failure on the module. You need to measure the 24 V DC supply at the supply terminals of the power supply.
  • F30885 CU DRIVE-CLiQ: Cyclic data transfer error. No communication with one of the system's Drive-Cliq Power Modules, although it is configured. A DRIVE-CLiQ communication error has occurred between the Control Unit and the affected Power Module. Check the power on the corresponding module.
  • F31115 (N, A) Encoder 1: Amplitude error track A or B (A^2 + B^2). A or B signal amplitude error. Amplitude (A ^ 2 + B ^ 2) is not within the allowed range (software monitoring function). One of the resolver windings may be broken.
  • F31116 (N, A) Encoder 1: Amplitude error, monitoring track A + B. Amplitude error monitoring A + B signals. The amplitude of rectified encoder A and B signals is not within the allowed range (hardware monitoring). The encoder may need to be repaired.
  • F31120 (N, A) Encoder 1: Power supply voltage. Encoder supply voltage failure. The measured encoder supply voltage is too low. Check the encoder cable.
  • A31400 (F, N) Encoder 1: Alarm threshold, zero mark distance error. The measured number of pulses between the zero marks does not correspond to the correct value. Such a malfunction may occur, for example, due to a dirty encoder glass.
  • A31411 (F, N) Encoder 1: EnDat encoder signals alarms. EnDat warning signal of the encoder. Error bits are set in the received packet from the EnDat encoder. An encoder is defective.
  • F31885 (N, A) CU DRIVE-CLiQ: Cyclic data transfer error. DRIVE-CLiQ communication error between the control module and the involved encoder. Check the power supply at the corresponding encoder.

Solutions for Common Sinamics S120 Fault Codes

Here are some common Siemens s120 fault codes and how to solve them.sinamics s120 error
1. F01000: Internal software error.

  • Evaluate Error Buffer
  • Perform POWER ON (power on/off) for all components.
  • If necessary, check the data in the non-volatile memory (memory card).
  • Update the firmware to the latest version.
  • Replace control box

2. F01001: Floating point exception

  • Perform POWER ON (power on/off) for all components.
  • Check the block configuration and signals in FBLOCKS.
  • Check the configuration and signals of the DCC charts.
  • Update the firmware to the latest version.

3. F01002: Internal software error.

  • Perform POWER ON (power on/off) for all components.
  • Update the firmware to the latest version.

4. F01003: Memory access confirmation delay

  • Perform POWER ON (power on/off) for all components.

Importance of Regular Maintenance and Diagnosis for Sinamics S120

Regular maintenance and diagnostics are critical for the Sinamics S120 drive system to ensure its optimum performance, durability, and reliability. Here are some of the main reasons why regular maintenance and diagnostics are important.

  • Prevent costly downtime.
  • Extended system life.
  • Optimal performance.
  • Security guarantee.
  • Energy efficiency.
  • Improved system diagnostics.

Effectively Address Sinamics S120 Fault Codes

Effective handling of Sinamics S120 error codes requires a systematic approach and understanding of specific error codes. Here are a few general steps to help troubleshoot error codes effectively.

  • Refer to documentation
  • Identify the fault code.
  • Check the description of the fault code.
  • Perform initial checks.
  • Eliminate possible causes of problems.
  • Take corrective action.
  • Remove the error and check the work.
  • Document and learn.


If the problem persists or you are unsure of the correct procedure, we recommend that you contact Siemens Technical Support or an experienced technician for assistance.

At Eltra Trade, we offer a wide selection of Siemens SINAMICS S120 Servo Drives. Our managers ensure expert selection and fast worldwide delivery.

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