Code A00501: Current Limit
Issue Description & Safety Warning
The Siemens SINAMICS G120 CU240S Drive has triggered a critical Current Limit 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
Reaction: NONE Acknowledge: NONE Cause: - Motor power does not correspond to the inverter power - Motor leads are too long - Earth faults Remedy: Check the following: - Motor power (P0307) must correspond to inverter power (r0206). - Cable length limits must not be exceeded. - Motor cable and motor must have no short-circuits or earth faults - Motor parameters must match the motor in use - Value of stator resistance (P0350) must be correct - Motor must not be obstructed or overloaded - Increase Ramp-up time (P1120) - Reduce Starting boost level (P1312)
Source: SINAMICS G120 Control Units CU240S Faults and Alarms (Edition 05/2007)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Siemens SINAMICS G120 CU240S Drive Alarms
Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code A00501 on the SINAMICS G120 CU240S Drive 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: 108 Siemens SINAMICS G120 CU240S Drive codes.
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