Code LF2: Output current imbalance
Issue Description & Safety Warning
The Yaskawa V1000 AC Drive has triggered a critical Output current imbalance 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 V1000 Troubleshooting Phase loss has occurred on the output side of the drive. - Check for faulty wiring or poor connections on the output side of the drive. - Correct the wiring. Terminal wires on the output side of the drive are loose. Apply the tightening torque specified in this manual to fasten the terminals. Refer to Wire Size on page 63. No signal displays from the gate driver board. Replace the drive. Contact Yaskawa for assistance. Motor impedance or motor phases are uneven. - Measure the line-to-line resistance for each motor phase. Ensure all values are the same. - Replace the motor. Contact Yaskawa for assistance.
Source: Yaskawa AC Drive V1000 Compact Vector Control Drive Technical Manual (SIEP C710606 19D)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Yaskawa V1000 AC Drive Alarms
Yaskawa controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code LF2 on the V1000 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: 153 Yaskawa V1000 AC Drive codes.
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