Code LF2: Output Current Imbalance
Issue Description & Safety Warning
The Yaskawa A1000 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 A1000 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 and Torque Specifications on page 87. The output circuit is damaged. Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your nearest sales representative. 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.
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 LF2 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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