The SINAMICS S210 is Siemens' compact single-axis servo converter. It runs 1FK2 servo motors over one cable that carries power, encoder signals and the brake. When it stops, the display or web server shows a code like F30001 or A07910. F codes are faults that stop the motor. A codes are alarms that warn you first.
Most S210 codes are settings or communication messages. A handful usually point to a hardware problem in the converter, the motor or the cable. These are the six we see most.
| Code | What it means | Check first |
|---|---|---|
| F30001 Overcurrent | The output stage saw more current than it can handle | Megger the motor and cable to ground with power off |
| F30002 DC link overvoltage | A braking motor pushed the DC bus voltage too high | Does it only trip while slowing down? Check the braking resistor |
| F30004 Heat sink overtemperature | The converter got too hot | Fan turning, heat sink clean, cabinet temperature |
| F07900 Motor blocked | The motor sat at full torque without turning | Does the brake click open? Does the axis turn freely? |
| F07930 Brake control error | A fault in the circuit that opens the motor brake | OCC cable, connectors and brake coil resistance |
| F07575 Motor encoder not ready | The motor's encoder isn't answering | Reseat or swap the OCC cable; read the other encoder messages |
Converter, motor or cable?
On an S210 the three parts fail in different ways. A fault that follows the motor when you move it to another converter is in the motor or its encoder. A fault that stays with the converter is in the converter. Brake and encoder faults that come and go when the cable is moved usually mean a damaged OCC cable.
Always isolate power and wait for the DC link to discharge before you touch connections.
When to send it in
If the motor and cable test good and the fault stays with the converter, the power stage, brake output or encoder interface is likely damaged. On the motor side, encoder, brake and winding faults are common repairs. We give a free evaluation and a written quote before any work starts.
Full list: all 275 SINAMICS S210 fault codes.
Related: Servo drive repair · Servo motor repair · Encoder repair · Request a repair quote
Frequently asked questions
What is the difference between an F code and an A code on the S210?
An F code is a fault: the converter stops the motor and the fault must be cleared. An A code is an alarm: a warning that does not stop the motor on its own.
Can I clear F30001 and keep running?
You can acknowledge it, but if it comes back straight away there is usually a short in the motor or cable, or damage in the converter. Repeated restarts can make the damage worse.
Does the S210 use the same fault numbers as the S120?
Many of them, yes. Most S210 codes share their number and meaning with the S120, but the S210 has no separate Line Module or Motor Module, so the cause is always inside the one converter.
Need this unit looked at?
Free evaluation, written quote first, 12-month warranty.