05.06.2025 by Viktor Siebert
Device Arrival – Error F-E04 Yaskawa Varispeed 626VM3 CIMR-VMW2022 Spec: 20222
A customer sent us a Yaskawa Varispeed 626VM3 inverter unit for repair. The device was occasionally displaying error F-E04 (Motor Code Selection Error). The customer had already replaced the cooling fans, but the error still occurred sporadically — sometimes the unit ran flawlessly, other times it would trigger the fault without clear pattern.
As we have been working with this series for a long time, we were already familiar with the issue. The root cause typically lies in aging critical components, which degrade over time. If left unaddressed, the problem gradually worsens and can eventually lead to a catastrophic failure of the power stage. In such cases, repairs become far more complex and costly.
Fault Diagnosis & Testing on Our Bench
Fortunately, the customer contacted us in time — before any major damage had occurred. We subjected the device to a comprehensive analysis. At our in-house test station, we ran the unit with an original Yaskawa motor and were able to reproduce the fault.
We offered the customer a complete overhaul, which he accepted without hesitation.
Complete Overhaul & Replacement of Critical Components
The unit was fully disassembled. All circuit boards and housing parts were carefully cleaned, washed, and dried. We then replaced all worn and safety-critical components, including:
- Electrolytic and buffer capacitors
- Relays
- Transistor modules
- Current measurement modules
After reassembly, the device underwent extensive testing. The original error no longer appeared, and the inverter was successfully shipped back to the customer.
Customer Feedback – New Error F-100
Shortly after commissioning, the customer contacted us again — somewhat confused. The inverter operated properly in manual mode, and the tool engagement worked as expected. However, when running the automated machining program, error F-100 (Inverter Output Overcurrent) was triggered at specific points.
We immediately recognized the pattern, as this issue is also familiar to us and often relates to a worn Winding Selection Contactor.
Root Cause: Winding Selection Contactor
This component sits between the inverter and the motor and is responsible for switching between different motor windings depending on operation — much like shifting gears in a car. The switching is done mechanically via a contactor, which has a finite lifespan. After a certain number of operations, its reliability declines, leading to faults like F100.
Since we had the correct contactor in stock, the customer was able to replace it quickly. After the replacement, the machine ran without any issues.
Conclusion & Recommendation
This experience reinforces a key lesson: even if errors like F-100 do not occur constantly, the preventive replacement of the Winding Selection Contactor is highly recommended — even if the component has not yet shown clear signs of failure. Maintenance is not only about fixing existing problems, but also about proactively replacing critical parts before they become a liability.
Further information such as price and delivery time for:
Yaskawa Varispeed 626VM3 CIMR-VMW2022 Spec: 20222
More details about our Yaskawa repair expertise can be found here: Yaskawa Varispeed repairs by Industrypart
Similar models we regularly repair:
CIMR-VMW2022
CIMR-VMW20220
Article: Yaskawa HV-150AP4S Magnetic Contactor
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Our expert team is happy to help!
Device Overview: Yaskawa Varispeed 626VM3 CIMR-VMW2022
Model: CIMR-VMW2022
Spec: 2022
Weight: 56 kg
IGBT Modules: 1MBI300L-060
Type: Transistor Inverter
Primary Function: Frequency converter for precise motor control in industrial applications
Device Functions
- Controls three-phase induction motors via frequency conversion
- High accuracy in speed and torque control
- Integrated protection and diagnostic functions with error codes (Fxxx)
- Supports motors with encoder feedback (V/f, vector control)
- Powerful gate driver boards for rapid transistor switching
- Commonly used in CNC machines, machine tools, and automation systems
Built-in Boards & Components
| Board (DE) | Board (EN) | Label | Model | Manufacturer No. | Qty |
|---|
| Steuerplatine | Controller | 1PCB | YPHT11014-1A | ETC62001x | 1 |
| Steuerplatine | Digital Operator | | CDR001002 | | 1 |
| Leistung | Gate Driver | 2PCB | YPCT21104-1-1 | ETC62021x | 1 |
| Power Supply | Control Power Supply | – | AVR000379 | – | 1 |
Common Alarms & Fault Codes
A selection of relevant fault codes for this model:
| Fault Code | Description | Explanation / Cause | Action |
|---|
| F000 | Winding Selection Failure | Incorrect winding selection / no signal | Check parameter CI-25 |
| F001 | Emergency Stop Failed | Emergency stop not activated within 10 seconds | Check emergency stop circuit |
| F100 | Inverter Output Overcurrent | Output current exceeded limit | Check for short circuits, grounding issues, or motor damage |
| F300 | Inverter Input Overcurrent | Input side overcurrent | Inspect input power circuit |
| F400 | Inverter Overvoltage | DC bus voltage too high | Check input supply |
| F500 | Motor Overspeed | Motor speed exceeded maximum set value | Inspect speed control and encoder |
| F600 | Power Voltage Error 1 | Loss of synchronous power signal | Inspect power input |
| F700 | Inverter Output Overload | Output over 120% for 30 minutes | Reduce load, check cooling |
| F900 | Motor Thermal Error 1 | Motor temperature exceeded limit | Inspect fan and insulation |
| F-A00 | Initial Charging Incomplete | Main capacitor not fully charged | Inspect pre-charge resistor or power supply |
| F-d01 | Software Version Mismatch | Firmware mismatch | Check or update PROM version |
| CPF00 | CPU Failure 1 | Internal RAM failure | Replace controller board |
