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Check encoder type configuration

Navigate to MOD > Machine Parameters > MP710 POSITION_MEASURING_SYSTEM and verify encoder type matches physical encoder installed.

Use MP711 to confirm encoder interface type (EnDat, SSI, incremental) matches your actual encoder

Verify field angle determination method

Check MP750 FIELD_ANGLE_DETERMINATION method - ensure it's compatible with your encoder type (0=disabled, 1=with encoder, 2=without encoder).

Never attempt field angle determination with incremental encoders using method 1

Reconfigure parameters if mismatch found

If encoder is incremental, set MP750=2 or 0. If absolute encoder, verify MP712-MP715 encoder resolution parameters match encoder specifications.

Always cycle power after changing encoder-related machine parameters

Check current TNC operating mode

Ensure TNC is in Manual mode or Setup mode, not in Program Run or automatic operation when attempting field angle determination.

Never attempt servo commissioning during active machining operations

Verify axis reference status

Check if axes are properly referenced - field angle determination may be blocked if reference point status is unclear or axes are moving.

Use MOD > Diagnosis > Servo to check real-time axis status before commissioning

Clear any active axis movements

Press STOP/RESET to ensure no axis movements are active, then attempt field angle determination from Setup > Servo Commissioning menu.

Wait for all servo ready signals before starting field angle determination

Check encoder communication status

Navigate to MOD > Diagnosis > Encoder and verify encoder communication is stable with no intermittent errors or data corruption flags.

Look for EnDat error counters or SSI timeout errors in the encoder diagnostics

Verify encoder calibration data

Check if encoder reports valid calibration data - use encoder diagnostic screens to verify internal encoder parameters are readable.

Do not proceed if encoder shows communication errors or invalid calibration data

Reset encoder or replace if faulty

Attempt encoder reset through diagnostic menu. If calibration data remains corrupted, encoder may need replacement or factory recalibration.

Some EnDat encoders allow calibration data reset - check encoder manufacturer documentation

Check servo drive status

Verify servo drive shows ready status with no active faults. Check drive display for error codes or fault conditions.

Clear all drive faults before attempting field angle determination

Verify TNC-drive communication

Check MP760-MP780 servo interface parameters match drive configuration. Verify digital I/O connections for servo ready/fault signals.

Use oscilloscope to verify clean servo command signals if communication issues persist

Initialize servo drive properly

Ensure drive is properly initialized and in servo mode, not in open-loop or fault state. Check drive enable signals are active.

Some drives require specific initialization sequence - consult drive manual for proper startup procedure