Yaskawa V1000 fault codes: checks before a reset
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Does a V1000 fault code mean the drive has failed?
A V1000 fault code identifies a detected condition; it does not by itself identify a failed component. Record the exact display, fault history and whether the machine was starting, running or stopping before resetting it. Use the matching entry in the U-spec manual to investigate the cause before a controlled restart.
Common indications in the U-spec manual
| Code | Detected condition | Information to collect |
|---|---|---|
| oC | Overcurrent. | Operating stage, load condition and recent motor or cable work. |
| ov | DC-bus overvoltage. | Whether the event occurred during deceleration or another operating stage. |
| Uv1 | DC-bus undervoltage. | Supply interruptions and the machine state at the event. |
| oL1 | Motor overload. | Motor data, load history and motor-protection settings. |
| oL2 | Drive overload. | Drive rating, selected duty and load history. |
| oH1 | Drive overheat. | Ambient conditions and the condition of the cooling path. |
Scroll the table horizontally to view all columns.
Source: Yaskawa: U-spec manual SIEPC71060618. Use the applicable model and the conditions stated in the source.
Use the troubleshooting entry for the exact indication in Chapter 6 of manual SIEPC71060618. Alarm and fault behavior can depend on operating conditions and configuration, so retain the display and status information together.
A reset needs a reason
Investigate the cause and establish safe conditions before a controlled restart. Repeated resets can obscure the circumstances of the original event. Increasing protection thresholds or enabling automatic restart is a configuration change that needs engineering review.
Electrical measurements and inspection must follow the manual and the site's safe-work procedure. Isolate the equipment, observe the required discharge procedure and verify the electrical state before accessing the power circuit.
Prepare a useful fault report
Record the complete drive model, code, time of the event, commanded speed and relevant load information. Add recent changes to the wiring, motor, parameters or process. Include photographs of the nameplate and the displayed fault.
Compare the findings with the installed parameter record. A fault after a replacement may require a configuration review as well as hardware checks. The parameter checklist identifies records worth keeping.
When requesting a replacement
Send the fault report and complete model code with the enquiry. Confirm the replacement's electrical ratings, enclosure and configuration requirements. If the installed unit is CIMR-VUBA0010FAA, use the model-specific checklist before ordering.
Questions before the next step
Does oL1 mean the same thing as oL2?
No. In the cited U-spec manual, oL1 indicates motor overload and oL2 indicates drive overload. Keep the exact code with the motor data, selected duty and load history.
Should I keep resetting a recurring fault?
Investigate the cause and establish safe conditions before restarting. Preserve the event record; increasing protection thresholds or enabling automatic restart requires engineering review.
Include the fault record in your parts enquiry
Send the full drive model, exact fault code, operating stage and recent changes. Add a clear nameplate photograph and quantity if a replacement is required.
Manufacturer references
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