231-8B20

Access Drive Configuration Parameters

Press MOD key, navigate to Machine Parameters → CfgDrive → select the affected axis/spindle shown in %1. Verify this matches the actual axis experiencing the error.

Write down current parameters before making changes - parameter MP300x to MP308x contain critical motor data.

Verify Pole Pair Number

Check motor parameter for pole pairs (typically MP3020 for axis, MP4020 for spindle). Cross-reference with motor nameplate data. Incorrect pole pairs are the most common cause of field orientation errors.

For spindle motors, pole pairs = (motor RPM rating / synchronous speed). For example, 3000 RPM motor at 50Hz = 2 pole pairs.

Confirm Motor Type Selection

Verify motor type parameter (MP3010 for axis or MP4010 for spindle) matches: synchronous motor, asynchronous motor, or torque motor. Wrong selection causes incorrect field orientation calculation.

Selecting synchronous for an asynchronous motor or vice versa will prevent proper field control and can damage the drive.

Validate Rated Current Parameters

Check MP3030 (axis) or MP4030 (spindle) for rated motor current matches nameplate. Field orientation uses current for flux calculation - incorrect values cause algorithm failure.

Also verify peak current limit (MP3031/MP4031) is set to 1.5-2x rated current per motor specifications.

Access Drive Test Functions

Press MOD → Test Functions → Drive Test. Select the affected axis/spindle from the alarm message. Ensure machine is in a safe condition with sufficient clearance for motor movement.

Commutation search will cause the motor to move slightly. Ensure no collision risk and all safety circuits are active.

Execute Commutation Search

Select 'Commutation Search' or 'Motor Phasing' function. The control will energize the motor with DC current and rotate it slowly to detect rotor position. Process typically takes 5-15 seconds.

For linear motors, ensure adequate travel distance is available - at least one pole pitch plus safety margin.

Verify Commutation Offset Storage

After successful commutation, the offset angle is stored automatically. Check that MP3080 (axis) or MP4080 (spindle) now contains a non-zero commutation angle value (typically 0-359 degrees).

If value remains zero or commutation fails repeatedly, suspect encoder mounting error or incorrect pole pair setting.

Test Motor Movement

Use Manual Operating Mode to jog the axis slowly. Monitor for smooth operation without cogging or vibration. Field orientation should now be correct if movement is smooth.

Enable trace function (MOD → Trace Function) to monitor actual current vs. commanded current - good correlation indicates proper field orientation.

Check Encoder Diagnostics

Navigate to Position Display → Encoder Diagnostics for the affected axis. Review signal amplitude, error counter, and temperature. EnDat encoders should show error count = 0 and signal quality 'Good'.

For EnDat encoders, check 'Position value' field updates smoothly. Erratic jumping indicates signal problems.

Verify Encoder Mechanical Mounting

Physically inspect encoder coupling or mounting at motor. Check for loose mounting screws, shaft misalignment, or coupling damage. Angular misalignment >0.5° can cause field orientation errors.

Lock out machine power before accessing motor/encoder area. Ensure all safety procedures are followed.

Inspect Encoder Cable Routing

Trace encoder cable from motor to control, checking for damage, tight bending radius (<10x cable diameter), or routing parallel to power cables. Maintain minimum 100mm separation from motor power cables.

EnDat and resolver cables are particularly sensitive to EMI. Use shielded cable with 360° shield connection at both ends.