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Access PLC Machine Parameters

Press MOD key, select 'Machine Parameters', enter password if required, and navigate to MP2200-MP2299 range which contains drive and power module configuration settings.

Document all existing parameter values before making changes. Incorrect drive parameters can cause severe machine malfunction.

Verify Power Module Assignment

Check parameters that define power module topology for each axis (typically MP2210, MP2211, MP2212 series). Verify that parallel module configuration flags match the physical installation.

Compare the parameter settings with the machine manufacturer's original commissioning documentation or backup file to identify any deviations.

Correct Configuration Mismatch

If parallel connection is not intended, modify parameters to reflect single power module per axis. If parallel is required, ensure parameters explicitly enable and configure parallel operation per Heidenhain specifications.

Only enable parallel power module operation if supported by your specific hardware combination and properly documented in your machine configuration.

Save and Restart Control

Save modified machine parameters, perform a complete power cycle (not just reset), and observe if alarm clears during startup sequence. Monitor the drive initialization phase carefully.

Use the PLC monitoring functions during startup to verify that all power modules are correctly recognized and initialized on the drive bus.

Identify Installed Power Modules

Document the exact model numbers of all UM power modules installed in the system. Check the labels on the physical modules and record the full part numbers and firmware versions.

Power must be locked out before accessing the drive cabinet. Follow all electrical safety procedures.

Verify Approved Topology

Consult Heidenhain documentation specific to your control model (TNC 320/530/620/640) to confirm whether parallel operation of your specific power module models is permitted. Check technical manual sections on drive configuration and power module specifications.

Contact Heidenhain technical support with your control serial number and power module part numbers to get definitive confirmation of supported configurations.

Reconfigure Hardware if Necessary

If parallel configuration is not supported, replace the parallel modules with a single larger capacity UM module rated for your axis load. Update machine parameters to reflect the new single-module configuration.

Ensure replacement power module has adequate continuous and peak current ratings for the connected motor. Undersized modules will cause thermal shutdown or damage.

Test Drive Operation

After reconfiguration, clear alarm history, restart control, and perform controlled axis movement tests at reduced feedrate to verify proper operation before returning to production.

Monitor drive temperature and current consumption during initial testing to ensure the new configuration operates within thermal limits.

Check Drive Bus Connections

Verify all X118/X119 drive bus cables are properly seated on both the control side and power module side. Check for damaged connectors or cable shielding issues that could cause communication errors.

Power off and lockout before inspecting drive bus connections. Some signals remain active during standby.

Verify Module Address Configuration

Check the DIP switch or rotary switch settings on each power module to ensure unique addresses are assigned. No two modules should share the same address on the drive bus.

The address assignment must match the sequence expected by the PLC machine parameters. Document the physical address-to-axis mapping.

Monitor Drive Initialization

Use the PLC diagnostic display during control startup to observe which power modules are detected and at what addresses. Compare detected configuration against expected configuration from machine parameters.

Access PLC diagnostics via MOD > System > Drive Diagnostics to see real-time drive bus status and module recognition during boot sequence.

Reset Drive Configuration

If addressing appears correct but detection is faulty, perform a drive bus reinitialization through PLC functions. This forces the control to rescan and rebuild the drive topology map.

Drive reinitialization will temporarily disable all axes. Ensure machine is in a safe state and all movement is stopped.