6SL3210-1KE21-7AF1 SINAMICS G120C
The Siemens SINAMICS G120C (part number 6SL3210-1KE21-7AF1) is a compact, integrated variable frequency drive (VFD) belonging to the SINAMICS G120C series from Siemens. This unit is designed for the speed and torque control of three-phase induction motors and combines the Control Unit (CU) and Power Module (PM) into a single compact housing. With a power rating of 7.5 kW at 400 V AC, it is suited for applications requiring reliable and efficient motor control in a space-saving form factor.
The 6SL3210-1KE21-7AF1 supports multiple control modes including V/f control and vector control (sensorless), enabling flexible adaptation to various motor types and load profiles. It features integrated safety functions conforming to SIL 2 / PLd, including Safe Torque Off (STO) via onboard terminals. Communication is supported through integrated USS and Modbus RTU protocols over RS-485, with optional PROFIBUS DP or PROFINET connectivity via plug-in communication modules. The drive includes an integrated Class A EMC filter and a braking chopper for connection of an external braking resistor, and operates over an input voltage range of 380–480 V AC, 3-phase.
The SINAMICS G120C is widely deployed in commercial and industrial applications such as pumps, fans, compressors, conveyor systems, and general material handling equipment. Its compact dimensions make it particularly suitable for installation in confined control cabinet spaces. The integrated safety functions and broad communication options make it a practical choice for machine builders and plant operators seeking a cost-effective, standards-compliant drive solution.
Technical Specifications
| Power Rating | 7.5 kW |
|---|---|
| Input Voltage | 380–480 V AC, 3-phase |
| Input Frequency | 47–63 Hz |
| Output Current (Continuous) | 17.5 A |
| Output Current (Peak) | 26.3 A (200% for 3 s) |
| Control Type | V/f control, Sensorless Vector Control (SLVC) |
| Communication Interface | USS, Modbus RTU (RS-485); optional PROFIBUS DP / PROFINET via module |
| Safety Functions | Safe Torque Off (STO), SIL 2 / PLd per IEC 62061 / ISO 13849-1 |
| EMC Filter | Integrated Class A filter |
| Braking Resistor Support | Yes, integrated braking chopper |
| Operating Temperature | -10 °C to +40 °C (up to +60 °C with derating) |
| Protection Rating | IP20 |
| Mounting | DIN rail or panel mounting |
| Certifications | CE, UL, cUL, RoHS |
| Series/Product Family | SINAMICS G120C |
Common Fault Codes
- F01000
- Internal software error in the Control Unit firmware.
Perform a factory reset (p0970=1), update firmware if available, and replace the Control Unit if the fault persists. - F07801
- Motor overcurrent detected. Output current has exceeded the permissible limit.
Check motor wiring for short circuits or ground faults, verify motor parameters (p0304–p0311), and ensure load is not mechanically jammed. - F07802
- Drive output phase failure or motor phase imbalance detected.
Check all three output phases to the motor for open connections, inspect cable and motor terminals, and verify motor winding resistance. - F07900
- DC link overvoltage. The DC bus voltage has exceeded the permissible threshold.
Check incoming supply voltage, verify braking resistor connection and sizing, and consider enabling the Vdc_max controller (p1240). - F07901
- DC link undervoltage. The DC bus voltage has dropped below the minimum threshold.
Check input supply voltage and connections, inspect input fuses and contactor, and verify that supply voltage is within the rated range of 380–480 V AC. - F08501
- Safe Torque Off (STO) activated unexpectedly or STO wiring fault detected.
Check STO terminal wiring (EP terminals), verify the STO enable signal is correctly applied, and inspect for broken or loose connections on the safety circuit. - F30001
- Power Module overcurrent or short circuit at the inverter output.
Check motor and output cable insulation resistance, inspect for short circuits between output phases or to ground, and replace the Power Module if hardware damage is confirmed. - A07012
- Alarm: Motor temperature warning. Motor thermal model indicates elevated temperature.
Check motor load cycle and ambient temperature, verify motor cooling, and confirm correct motor thermal parameters (p0625, p0626) are set.
Frequently Asked Questions
What is the output power and current rating of the 6SL3210-1KE21-7AF1?
This drive is rated at 7.5 kW with a continuous output current of 17.5 A at 400 V AC, 3-phase. It can deliver a peak current of 26.3 A (200% overload) for up to 3 seconds.
Does the 6SL3210-1KE21-7AF1 have an integrated EMC filter?
Yes, the SINAMICS G120C 6SL3210-1KE21-7AF1 includes an integrated Class A EMC filter, making it suitable for use in industrial environments without requiring an external filter in most installations.
What safety functions are supported by this drive?
The drive supports Safe Torque Off (STO) as an integrated safety function, certified to SIL 2 per IEC 62061 and PLd per ISO 13849-1, accessible via onboard EP (Enable Pulses) terminals.
Which communication protocols does this drive support?
The 6SL3210-1KE21-7AF1 natively supports USS and Modbus RTU over RS-485. Additional fieldbus protocols such as PROFIBUS DP or PROFINET can be added via optional plug-in communication modules.
Can this drive be mounted on a DIN rail?
Yes, the SINAMICS G120C supports both DIN rail mounting and direct panel (screw) mounting, providing flexibility for installation in standard control cabinets.
Troubleshooting
Drive displays fault F07900 (DC link overvoltage) during deceleration
The DC bus voltage is rising above the permissible limit during motor braking, indicating that regenerative energy is not being dissipated adequately.
Verify that the external braking resistor is correctly connected and properly sized for the application. Enable the Vdc_max controller via parameter p1240 to automatically extend the deceleration ramp when overvoltage is detected. Increase the deceleration ramp time (p1121) if a braking resistor is not used.
Drive does not start and STO fault or alarm is active
Check the STO (EP) terminals on the Control Unit. The STO function requires a 24 V DC signal on both EP+ and EP- terminals to enable the drive. Absence of this signal will prevent the drive from enabling the output.
Verify that 24 V DC is correctly applied to both EP terminals. Check the safety relay or PLC output supplying the STO signal. If STO is not used, bridge the EP terminals with 24 V DC as described in the commissioning manual.
Motor runs but speed does not match the setpoint
Check the active control mode (p1300) and the setpoint source configuration (p1000). Incorrect scaling of the analog input or a misconfigured fieldbus setpoint can cause speed deviation.
Verify the setpoint source parameter (p1000) and ensure the analog input scaling (p0757–p0760) matches the signal provided. Re-run the motor identification routine (p1910) to ensure accurate motor model parameters.
Drive trips on F07801 (overcurrent) at startup
Overcurrent at startup typically indicates incorrect motor parameters, an undersized drive for the connected load, or a mechanical jam in the driven equipment.
Verify that motor nameplate data is correctly entered in parameters p0304–p0311. Run the motor data identification routine (p1910=1) with the motor uncoupled if possible. Inspect the mechanical load for obstructions or excessive friction.
No communication response via Modbus RTU or USS
Check the RS-485 wiring between the drive and the master device, including correct terminal assignment (P+ and N- on the drive's RS-485 port). Verify baud rate, parity, and station address settings.
Confirm that the drive's RS-485 terminals are correctly wired with proper termination resistors at both ends of the bus. Match the baud rate (p2020), parity (p2021), and USS/Modbus address (p2021/p2023) settings between the drive and the master controller.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|
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