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Access MOD configuration mode

Power on the control while holding the MOD key to enter service mode. Navigate to 'System' > 'Configuration' > 'Drive Configuration'.

MOD mode access requires password and should only be performed by qualified service personnel. Incorrect changes can render the machine inoperable.

Examine UVRS.SYS file

Navigate to TNC:\system\config\UVRS.SYS and review all UVR%2 entries. Look for parameter assignments related to axis 2 undervoltage release functionality.

Use TNCremo software to download and review the UVRS.SYS file on a PC for easier editing and backup before making changes.

Verify parameter values against documentation

Cross-reference all UVR%2 parameter values with the Heidenhain Inverter Technical Manual for your specific inverter series (UM 1xx or UM 2xx). Ensure values are within specified min/max ranges.

Parameter ranges differ significantly between UM 1xx and UM 2xx series inverters. The %2 indicates second axis, so verify this matches your Y-axis or second rotary axis configuration.

Correct invalid parameters

Edit the UVRS.SYS file to correct any out-of-range or invalid UVR%2 parameters. Save the file and perform a control restart to reload configuration.

Always create a backup of the original UVRS.SYS file before editing. Incorrect syntax can prevent control startup.

Test and verify

After restart, verify the alarm is cleared and perform a drive reference run on axis 2 to confirm proper UVR2 functionality.

Monitor the LogFile.txt in TNC:\system\log\ for any residual configuration warnings related to UVR2 during startup.

Identify installed inverter hardware

Check the physical inverter label on axis 2 drive module for exact model number (UM 1xx-x or UM 2xx-x). Record the complete type designation and serial number.

Ensure machine power is locked out before accessing drive cabinet for visual inspection.

Compare with configured inverter type

In MOD mode, navigate to 'System Parameters' > 'Inverter' and check the configured inverter type for axis 2. Compare this with the actual installed hardware model.

The inverter type ID is typically found in machine parameter MP7xx series. Specifically check MP710 for axis assignment and MP720 for inverter type designation.

Update inverter type configuration

If mismatch exists, update the inverter type parameter in MOD mode to match the installed hardware. Navigate to the inverter configuration table and select the correct model for axis 2.

Heidenhain controls require exact inverter type matching. Using 'auto-detect' may not properly configure UVR parameters; manual specification is more reliable.

Reinitialize drive parameters

After correcting the inverter type, perform a drive parameter initialization: MOD > System > Initialize > Drive Parameters > Select Axis 2. This will reload default UVR2 settings for the correct hardware.

Drive initialization will reset all drive-specific tuning parameters. Document any custom settings before proceeding.

Reload machine-specific UVR settings

If the machine requires specific UVR2 settings (non-default), restore these from machine backup or manufacturer documentation after initialization.

Contact the machine tool builder for the original drive configuration file specific to your machine model if custom UVR2 timing or threshold settings were required.