Code 20097: Axis %1 incorrect travel direction brake test
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Axis %1 incorrect travel direction brake test 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
Parameters: %1 = Axis name, spindle number Definitions: Due to the selected travel direction, the brake test for the current load torque is performed with an incorrect torque. Reaction: Alarm display. Remedy: - Perform the brake test for the other travel direction - Adjust drive parameter p1532 better to the current weight ratio. The alarm will occur only if the current torque deviates from drive parameter p1532 by more than 7.5% of MD36966 $MA_SAFE_BRAKETEST_TORQUE when the brake is released. - Activate the automatic determination of the l oad torque at the beginning of the brake test via MD36968 $MA_SAFE_BRAKETEST_CONTROL, bit 0 = 1. Program Continuation: Clear alarm with the Delete key or NC START.
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 20097 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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