Code rH: Braking Resistor Overheat
Issue Description & Safety Warning
The Yaskawa V1000 AC Drive has triggered a critical Braking Resistor Overheat 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 Deceleration time is too short and excessive regenerative energy is flowing back into the drive. - Check the load, deceleration time and speed. - Reduce the load. - Increase the acceleration and deceleration times (C1-01 through C1-08). - Replace the braking option with a larger device that can handle the power that is discharged. Excessive braking inertia. Recalculate braking load and braking power. Then try reducing the braking load and checking the braking resistor settings and improve braking capacity. The proper braking resistor has not been installed. - Check the specifications and conditions for the braking resistor device. - Select the optimal braking resistor. Note: The magnitude of the braking load trips the braking resistor overheat alarm, NOT the surface temperature. Using the braking resistor more frequently than its rating trips the alarm even when the braking resistor surface is not very hot.
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 rH 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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