Yaskawa GA Series Repair
The Yaskawa GA Series is a variable frequency drive used to control AC motor speed and torque in pumps, fans, conveyors, process equipment, and production machinery.
| Brand | Yaskawa |
| Equipment | GA50B4005ABBA |
| Equipment Category | GA Series |
| Industry | Plastics |
| 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
- oC – Overcurrent: Motor/cable short, overload, rapid acceleration or power-stage fault.
- ov – DC bus overvoltage: High line voltage, regenerative energy or short deceleration time.
- Uv1 – DC bus undervoltage: Low input voltage, phase loss, fuse or supply interruption.
- oH1 – Heatsink overheat: Cooling fan/airflow issue, high ambient temperature or overload.
- oL1 – Motor overload: Mechanical overload, low-speed high torque or incorrect motor data.
- oL2 – Drive overload: Excessive drive current/duty cycle or undersized drive.
- GF – Ground fault: Motor/cable insulation failure or output leakage to ground.
- SC – Short circuit: Output short circuit, damaged cable/motor or power stage.
- PF – Input phase loss: Mains phase loss or input supply imbalance.
- LF – Output phase loss: Open motor phase, loose terminal or damaged motor cable.
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?
Yaskawa GA Series repair in Egypt for common faults including oC, ov, Uv1. Diagnosis, component-level repair, testing and technical support by EISAC Automation.
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