Siemens G120 Drive Manual: Parameter Setup & Fault Codes
The SINAMICS G120 is a modular variable frequency drive system from Siemens, widely used in industrial automation for controlling three-phase motors. This article compiles essential technical information from official manuals, including parameter lists, fault codes, wiring guidelines, and commissioning procedures.
Overview of the Siemens G120 Drive
The Siemens SINAMICS G120 is designed for general machinery construction, automotive, food and beverage, and material handling industries. It consists of a Control Unit (CU) and a Power Module (PM), allowing flexible configuration. The drive supports various motor types including induction motors and synchronous reluctance motors, with power ranges from 0.37 kW to 250 kW.
Key features include integrated safety functions (STO, SS1, SLS), energy-saving modes, and seamless integration with SIMATIC controllers via PROFINET or PROFIBUS. The modular design simplifies maintenance and reduces spare parts inventory.
G120 Control Units and Power Modules
The G120 family includes several CU variants: CU240B-2, CU240E-2, CU250S-2, and CU230P-2. Each offers different I/O counts, safety functions, and communication options. The Power Modules are available in PM240, PM240-2, PM250, and PM330 series, covering various voltage classes (200V, 400V, 690V).
| Control Unit | Digital Inputs | Analog Inputs | Safety Functions | Communication |
|---|---|---|---|---|
| CU240B-2 | 6 DI, 3 DO | 2 AI, 2 AO | STO (via terminals) | USS, Modbus RTU |
| CU240E-2 | 6 DI, 3 DO | 2 AI, 2 AO | STO, SS1, SLS | PROFINET, Ethernet/IP |
| CU250S-2 | 6 DI, 3 DO | 2 AI, 2 AO | Extended Safety | PROFIBUS, PROFINET |
Essential Parameters for Commissioning
Proper parameterization is critical for reliable operation. Below is a selection of commonly used parameters from the G120 manual. Always refer to the official parameter list for your specific firmware version.
| Parameter | Description | Typical Value |
|---|---|---|
| P0010 | Commissioning parameter filter | 1 (Quick commissioning) |
| P0304 | Rated motor voltage | e.g., 400 V |
| P0305 | Rated motor current | As per motor nameplate |
| P0307 | Rated motor power | e.g., 5.5 kW |
| P0310 | Rated motor frequency | 50 Hz or 60 Hz |
| P0311 | Rated motor speed | e.g., 1450 rpm |
| P1080 | Minimum frequency | 0.0 Hz |
| P1082 | Maximum frequency | 50.0 Hz |
| P1120 | Ramp-up time | 10.0 s |
| P1121 | Ramp-down time | 10.0 s |
Wiring Guidelines for Reliable Operation
Correct wiring is essential to avoid electromagnetic interference and ensure safety. Follow these practices from the G120 installation manual:
- Use shielded cables for motor connections and control signals. Ground the shield at both ends with large contact area.
- Separate power cables from signal cables by at least 20 cm to minimize coupling.
- Install line reactors or filters if the supply network has harmonics or voltage spikes.
- Connect the PE terminal properly; the leakage current may exceed 3.5 mA, requiring a fixed earth connection.
- For IT (ungrounded) systems, remove the Y-capacitor screw as described in the manual to avoid nuisance tripping.
The typical power wiring includes a main contactor, fuses or circuit breaker, optional line filter, and the Power Module. Control wiring depends on the selected macro (e.g., standard I/O, PROFINET).
Common Fault Codes and Troubleshooting
The G120 displays fault codes (Fxxxxx) and alarm codes (Axxxxx) on the operator panel or via diagnostics. Here are some frequent faults and their remedies:
| Fault Code | Description | Possible Cause | Remedy |
|---|---|---|---|
| F30001 | Overcurrent | Short circuit, ramp too fast, motor data wrong | Check motor cable, increase ramp time, verify P0304-P0311 |
| F30002 | DC link overvoltage | Supply voltage too high, regenerative load | Check line voltage, use braking resistor |
| F30003 | DC link undervoltage | Supply failure, phase loss | Check mains supply and fuses |
| F30005 | I2t overload | Drive overloaded, ambient temperature high | Reduce load, improve cooling |
| F07900 | Motor blocked | Mechanical jam, load too high | Check mechanics, increase torque limit |
For a complete list, refer to the SINAMICS G120 List Manual. Faults can be acknowledged via digital input, operator panel, or communication bus after the cause is resolved.
Commissioning Steps Using the BOP-2 or Starter Software
The Basic Operator Panel (BOP-2) or the PC-based STARTER/SINAMICS Startdrive software guides you through commissioning. The typical workflow:
- Restore factory settings (P0010=30, P0970=1).
- Set the motor data from the nameplate (P0304, P0305, P0307, P0310, P0311).
- Select the application macro (P0015) if using predefined I/O configuration.
- Perform motor identification (P1900=2 for rotating measurement, or P1900=1 for standstill).
- Configure the setpoint source (P1000) and command source (P0700).
- Set ramp times, minimum/maximum frequencies, and current limits.
- Test run with low speed and verify direction.
Always ensure the motor is disconnected from the load during motor identification to avoid unexpected movement.
Integration with Automation Systems
The G120 can be controlled via digital/analog I/O, fieldbus (PROFINET, PROFIBUS, EtherNet/IP), or USS/Modbus RTU. For PROFINET, the G120 is configured in the TIA Portal using the GSDML file. Cyclic data exchange includes control word (STW1) and status word (ZSW1), along with setpoints and actual values.
Standard telegrams (e.g., Telegram 1, 20) define the process data structure. For advanced applications, free telegrams can be configured using BICO technology, allowing flexible interconnection of signals.
Note: Always download the latest version of the SINAMICS G120 operating instructions, parameter manual, and safety manual from the official Siemens Industry Online Support website. The information provided here is for educational purposes and may not cover all firmware variants.
