Siemens SINAMICS G120 Repair
The Siemens SINAMICS G120 is a variable frequency drive used to control AC motor speed and torque in pumps, fans, conveyors, process equipment, and production machinery.
| Brand | Siemens |
| Equipment | 6SL3210-1KE21-3AF1 |
| Equipment Category | SINAMICS G120 |
| Industry | Pharma |
| Fault Reported |
|
| Repair Turnaround Time | Typical reference: 3–6 working days |
The Challenge
The driven motor could not run reliably, stopping a critical machine function and increasing production downtime.
Diagnosis
- The input stage, DC bus, pre-charge circuit, IGBT power section, gate drivers, current sensing, cooling system, and control board were inspected.
Our Solution
- Defective power or control components were replaced as required, cooling and connection issues were corrected, boards were cleaned, and the drive was functionally tested with a motor.
1. BEFORE
2. DISASSEMBLY
3. INSPECTION
4. FUNCTIONAL TESTING
Testing Performed
- Input inspection; DC-bus test; power-stage test; motor rotation test; current monitoring; fault-reset test; thermal and burn-in test.
Final Result
The reference repair process restores normal functional operation after the unit passes the defined electrical, communication, motion, or load checks applicable to the equipment.
Common Fault Codes & Causes
- F30001 – Overcurrent: Motor/cable short circuit, ground fault, excessive load, incorrect motor data or power-unit fault.
- F30002 – DC-link overvoltage: High supply voltage, regenerative energy, short deceleration time or braking issue.
- F30003 – DC-link undervoltage: Low/failed mains supply, phase loss, input fuse or supply interruption.
- F30004 – Drive/inverter overtemperature: Cooling fan failure, blocked airflow, high ambient temperature or overload.
- F30005 – Power unit overload I2t: Excessive continuous load, duty cycle too demanding or undersized drive.
- F30011 – Line phase failure: Missing input phase, blown fuse or severe supply imbalance.
- F30015 – Motor cable phase failure: Open motor phase, loose terminal, damaged cable or unstable control.
- F30021 – Ground fault: Motor winding insulation fault, damaged motor cable or power-stage fault.
- F30027 – DC-link precharge timeout: Precharge circuit, contactor/resistor, supply or DC-link issue.
- F30036 – Internal overtemperature: Internal cooling problem, contamination, fan issue or excessive thermal stress.
Preventive Maintenance
- Maintain clean cooling paths, verify motor load and cabling, inspect fans, protect against voltage disturbances, and keep the cabinet temperature within limits.
Related Services
- Industrial Electronics Repair; Servo Motor Repair; Servo Drive Repair; PLC/HMI/VFD Repair; PCB Repair
Need Professional Repair?
Siemens SINAMICS G120 repair in Egypt for F30001, F30002, F30003 and other common faults. Professional diagnosis, repair and testing by EISAC Automation.
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