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Code 207329: <location>Drive: kT estimator, kT(iq) characteristic or voltage compensation does not function

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical <location>Drive: kT estimator, kT(iq) characteristic or voltage compensation does not function 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: %1 Drive object: SERVO Reaction: NONE Acknowledge: NONE Cause: A function of the function module "extended torque control" (r0108.1) was activated - however the (complete) function is not available. Fault value (r0949, interpret decimal): 1... 3: The kT estimator is active (p1780.3 = 1) wi thout a functioning compensation of the voltage emulation error in the drive converter. This mean s that the accuracy is severely restricted. 1: The drive converter voltage emulation error "final value" is 0 (p1952). 2: The drive converter voltage emulati on error "current offset" is 0 (p1953). 3: The compensation of the voltage emulation error is disabled (p1780.8 = 0). 4: The kT estimator (p1780.3 = 1), the kT(iq) char acteristic (p1780.9 = 1) or the compensation of the voltage emulation error (p1780.8 = 1) was activat ed without activating the function module "extended torque control" (when the function module is acti vated, the following must apply: r0108.1 = 1). Remedy: Re fault value = 1, 2: - carry out an identification of the voltage emulati on error in the drive converter (p1909.14 = 1, p1910 = 1). - set the parameter to compensate the voltage emulat ion error in the drive converter (p1952, p1953). Re fault value = 3: - enable the compensation of the voltage emulatio n error in the drive converter (p1780.8 = 1). Re fault value = 4: - activate the function module "ext ended torque control" (r0108.1 = 1) or de-activate the corresponding functions (p1780.3 = 0, p1780.8 = 0, p1780.9 = 0).

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 207329 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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