Code 207801: <location>Drive: Motor overcurrent
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Drive: Motor overcurrent 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: SERVO Reaction: OFF2 (NONE, OFF1, OFF3) Acknowledge: IMMEDIATELY Cause: The permissible motor limit current was exceeded. - effective current limit set too low. - current controller not correctly set. - motor was braked with an excessivel y high stall torque correction factor. - V/f operation: Up ramp was set too short or the load is too high. - V/f operation: Short-circuit in the motor cable or ground fault. - V/f operation: Motor current does not match the current of Motor Module. Note: Synchronous motor: Limit current= 1.3 * p0323 Induction motor: Limit current= 1.3 * r0209 Remedy: - check the current limits (p0323, p0640). - check the current controller (p1715, p1717). - reduce the stall torque correction factor (p0326). - increase the up ramp (p1318) or reduce the load. - check the motor and motor cables for short-circuit and ground fault. - check the Motor Module and motor combination. SINAMICS-Alarms Diagnostics Manual (DAsl), 03/2009
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 207801 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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