Code dv3: Inversion Detection
Issue Description & Safety Warning
The Yaskawa A1000 AC Drive has triggered a critical Inversion Detection alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Code type: Fault Manual section: Yaskawa A1000 Troubleshooting The Z pulse offset is not set properly to E5-11. Set the value for Δθ to E5-11 as specified on the motor nameplate. Replacing the PG encoder or changing the application so that the motor rotates in reverse instead requires readjustment of the Z pulse offset. (T2-01 = 3) An external force on the load side has caused the motor to move. - Make sure the motor is rotating in the right direction. - Look for any problems on the load side that might be causing the motor to rotate in the opposite direction. Electrical signal interference along the PG cable affecting the A or B pulse. Rewire the PG encoder and make sure all lines including shielded line are properly connected. PG encoder is disconnected, not wired properly, or the PG option card or PG itself is damaged. Rotational direction for the PG encoder set to F1-05 is the opposite of the order of the motor lines. Make sure motor lines for each phase (U, V, W) are connected properly.
Source: Yaskawa AC Drive A1000 High Performance Vector Control Drive Technical Manual (SIEP C710616 21H)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Yaskawa A1000 AC Drive Alarms
Yaskawa controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code dv3 on the A1000 AC Drive identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Yaskawa's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 280 Yaskawa A1000 AC Drive codes.
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