Code oL7: High-Slip Braking oL
Issue Description & Safety Warning
The Yaskawa V1000 AC Drive has triggered a critical High-Slip Braking oL 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 Excessive load inertia. - Reduce deceleration times using parameters C1-02, C1-04, C1-06 and C1-08 in applications that do not use High-slip Braking. - Use a braking resistor to shorten deceleration time. Motor is driven by the load. Something on the load side is restricting deceleration. The overload time during High-slip Braking is too short. - Increase parameter n3-04 (High-slip Braking Overload Time). - Install a thermal relay and increase the parameter setting of n3-04 to the maximum value.
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 oL7 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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