Code 207432: <location>Drive: Synchronous motor without overvoltage protection
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Drive: Synchronous motor without overvoltage protection 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: OFF2 (OFF1) Acknowledge: IMMEDIATELY Cause: Under voltage conditions, a synchronous motor c an generate an overvoltage condition that can destroy the drive system. Fault value (r0949, interpret hexadecimal): Associated Drive Data Set (DDS). Remedy: Overvoltage protection can be implemented in the following ways: - limit the maximum speed (p1082) without any additional protection. The maximum speed without protec tion is calculated as follows: Rotary motors: p1082 [rpm] <= 11.695 * p0297/p0316 [Nm/A] Linear motors: p1082 [m/min] <= 73.484 * p0297/p0316 [N/A] - use a voltage protection module (VPM) in conjunct ion with the function "Safe Torque Off" (p9601, p9801). When a fault condition exists, the VPM short-circuits the motors. Duri ng the short-circuit, the pulses must be suppressed - this means that the terminal s for the function "Safe Torque Off" must be connected to the VPM. When using a VPM, p0643 must be set to 1. - activating the internal volt age protection (IVP) with p1231 = 3. See also: p0643 (Overvoltage protec tion for synchronous motors), p1231 (Armature short-circuit / DC brake configuration)
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 207432 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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