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Heidenhain Controller
Communication · Intermediate · 30-120 minutes
HEIDENHAIN 235-00A8 - Überzähliger Umrichter an HSCI-Gerät
HEIDENHAIN alarm 235-00A8 occurs when the TNC control detects additional drive inverters connected to an HSCI device that are not configured in the machine parameters. This typically happens when hardware configuration options don't match the physical drive setup or when extra drives are physically connected but not declared in the system configuration.
HEIDENHAIN 235-00A8 - Überzähliger Umrichter an HSCI-Gerät
Überzähliger Umrichter an HSCI-Gerät
In an HSCI device, extra inverters are connected that were not configured. These need to be removed or the configuration adjusted.
Root Cause Summary
HEIDENHAIN alarm 235-00A8 occurs when the TNC control detects additional drive inverters connected to an HSCI device that are not configured in the machine parameters. This typically happens when hardware configuration options don't match the physical drive setup or when extra drives are physically connected but not declared in the system configuration.
Safety
Causes and Fixes
Access Machine Parameters
Press MOD key, select 'Machine Parameters' menu, navigate to MP7300 series (HSCI configuration parameters).
Document current settings before making changes
Verify Drive Configuration
Check MP7301 (number of drives) and MP7302-MP7309 (individual drive assignments) against physical hardware setup.
Incorrect drive parameters can cause axis runaway
Update Configuration
Modify MP7301 to match actual drive count and configure individual drive parameters MP7302-MP7309 for each connected inverter.
Use the alarm display values %1, %3, %4, %5 to identify specific drive types and serial numbers
Restart Control
Perform complete TNC restart (CTRL+ALT+DEL) to reinitialize HSCI communication with new parameters.
Call a technician if:
Prevention
Common Mistakes
Seeing Multiple Alarms?
Seeing another alarm with this one? Enter the code.
AxisMD logs alarms against your actual machines, tracks patterns, and gives AI context your manual doesn't have.
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Always verify with your machine manual or a certified technician before performing service procedures.