Code 207960: <location>Drive: Incorrect friction characteristic
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Drive: Incorrect friction characteristic 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: Parameter: %1 Drive object: SERVO, VECTOR Reaction: NONE Acknowledge: NONE SINAMICS-Alarms Cause: The friction characteristic is incorrect. Alarm value (r2124, interpret decimal): 1538: The friction torque is greater than the maximum from the upper effective torque limit (p1538) and zero. This is the reason that the output of the friction characteristic (r3841) is limited to this value. 1539: The friction torque is less than the minimum from th e lower effective torque limit (p1539) and zero. This is the reason that the output of the friction characteristic (r3841) is limited to this value. 3820... 3829: Incorrect parameter number. The speeds entered in t he parameters for the friction characteristic do not correspond to the following condition: 0.0 < p3820 < p3821 <... < p3829 <= p0322 or p1082, if p0322 = 0 Therefore the output of the friction ch aracteristic (r3841) is set to zero. 3830... 3839: Incorrect parameter number. The torques entered in t he parameters for the friction characteristic do not correspond to the following condition: 0 <= p3830, p3831... p3839 <= p0333 Therefore the output of the friction ch aracteristic (r3841) is set to zero. See also: r3840 (Friction c haracteristic, status word) Remedy: Fulfill the conditions for t he friction characteristic. Re alarm value = 1538: Check the upper effective torque limit (e.g. in the field weakening range). Re alarm value = 1539: Check the lower effective torque limit (e.g. in the field weakening range). Re alarm value = 3820... 3839: Fulfill the conditions to set the param eters of the friction characteristic. If the motor data (e.g. the maximum speed p0322) are changed during commissioning (p0010 = 1, 3), then the technological limits and threshold val ues, dependent on this, must be re-calculated by selecting p0340= 5).
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 207960 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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