230-049D

Verify Parameter Changes

Check which motor or encoder parameters were modified via MOD > MACHINE PARAMETERS > AXIS PARAMETERS or MOD > DRIVE CONFIGURATION. Common parameters include motor poles (CfgMotPol), encoder type (CfgEncTyp), or EnDat encoder settings.

Use the parameter change log in MOD > SYSTEM INFO > PARAMETER CHANGES to see exactly what was modified and when.

Document Current Configuration

Record all modified parameters and verify they match the physical motor and encoder installed on the machine. Cross-reference with motor nameplate data and encoder documentation.

Incorrect motor parameters can cause severe mechanical damage or runaway conditions upon restart.

Perform Controlled Shutdown

Use the TNC shutdown procedure: Move all axes to safe position, exit all programs, select MOD > SHUTDOWN or use the operating system shutdown function. Wait for confirmation before proceeding.

Execute Full Power Cycle

Switch off main power disconnect. Wait minimum 30 seconds for complete DC bus discharge. Power up system and observe drive initialization sequence during TNC boot. Monitor PLC log for drive enable sequence.

For iTNC 530 and TNC 620/640, watch the boot screen to confirm all drives complete their initialization phase without errors.

Verify Drive Functionality

After successful boot, execute controlled axis movements in Manual mode. Check encoder monitoring, commutation quality, and verify no following errors occur. Use MOD > DIAGNOSIS > DRIVE STATUS to confirm proper operation.

Identify Modified Drive Parameters

Access MOD > DRIVE CONFIGURATION and review recently changed parameters, particularly CfgImax (maximum current), CfgUdcMax (DC bus voltage), CfgSwFreq (switching frequency), or current controller gains.

On TNC 640, use the 'Show changed parameters' filter to quickly identify modifications.

Validate Parameter Values

Cross-check modified parameters against the drive specification and motor ratings. Ensure values are within permissible ranges specified in the Heidenhain drive documentation for your specific amplifier model.

Excessive current limits or incorrect PWM frequencies can damage drive power modules.

Save Configuration

Ensure all parameter changes are saved: MOD > SAVE PARAMETERS TO FILE. This creates a backup and confirms changes are written to non-volatile memory.

Execute Power Cycle

Perform complete power-down: main disconnect OFF, wait 30+ seconds, power ON. The drive will load new parameters from NVRAM during initialization and configure the power stage accordingly.

Listen for drive contactor/relay sequences during power-up - abnormal clicking patterns may indicate parameter conflicts.

Review Safety Parameter Changes

Check MOD > SAFETY CONFIGURATION or MOD > DRIVE CONFIGURATION for changes to safety encoder settings, safe torque off (STO) parameters, or EnDat2.2 safety-related configuration.

Safety parameter errors can compromise machine safety systems. Verify all changes with machine manufacturer documentation.

Verify Safety System Integrity

Before power cycle, ensure all safety circuit components are functioning: E-STOP circuits, safety doors, light curtains. Check that safety PLC logic is compatible with parameter changes.

Perform Safety-Compliant Power Cycle

Execute lockout/tagout procedure if required. Switch off main power, wait for complete discharge (minimum 30 seconds), restore power. Safety systems will perform validation during boot.

On TNC 640 with FSoE (Fail-Safe over EtherCAT), monitor the safety initialization phase during boot - it should complete without timeout errors.

Execute Safety Function Test

After successful boot, test all safety functions per machine validation protocol. Verify E-STOP response, safety door interlocks, and safe axis stop functionality before returning to production.

Do not bypass safety function testing after safety parameter changes - this is required for compliance.