Code 230062: <location>The bypass contactor was opened under current
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>The bypass contactor was opened under current 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
Message value: Drive object: All objects Reaction: NONE (OFF1, OFF2) Acknowledge: IMMEDIATELY (POWER ON) SINAMICS-Alarms Cause: The bypass contactor of the infeed unit was dam aged by being opened (multiple number of times) while it was conducting current. Possible causes: - scheduled opening under load can be necessary, for example, to pr otect the drive converter group in the event of a ground fault in high frequency spindles. - incorrect operator control of the infeed can cause t he contactor to switch under load. If, in spite of a missing operating enable, the infeed unit draws active motoring power from the DC link. Remedy: In order to avoid critically damaging the comple te drive converter group, it is urgently recommended to replace the damaged infeed unit.
Source: SINUMERIK 840D sl / 840Di sl / SINAMICS S120 Diagnostics Manual (DAsl, 03/2009)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Siemens SINUMERIK 840D CNC Alarms
Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 230062 on the SINUMERIK 840D CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Siemens's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4014 Siemens SINUMERIK 840D CNC codes.
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