230-01B0

Access spindle monitoring parameters

Navigate to MOD function (press MOD key) → Machine Parameters → enter filter '1260' to locate MP1260 SPIND. POSITIONING TIME

Typical values range from 2-10 seconds depending on spindle mass and drive performance

Check current timeout value

Review MP1260 current setting. If less than 3 seconds on larger spindles or less than 1 second on smaller spindles, value is likely insufficient

Note the current value before making changes - document original machine parameters

Perform test orientation

In MDI mode, execute M19 command and use stopwatch to measure actual positioning time. MP1260 should be set to 150-200% of measured time

Add 1-2 seconds buffer to account for variations in load and starting position

Adjust MP1260 if necessary

Increase MP1260 value incrementally (add 2-3 seconds). Power cycle control or execute 'Reset All' from positioning menu to activate new parameter

Parameter changes require machine manufacturer authorization - verify warranty implications

Check encoder monitoring display

Press Position Display key → select spindle axis (typically 'S' or configured name) → observe position values while manually rotating spindle by hand with drive disabled

Position should increment smoothly without jumps - each revolution should show consistent counts

Verify encoder signals in diagnostic screen

MOD → Diagnosis → Encoder → select spindle encoder channel. Check signal amplitude for 1Vpp (should be 0.8-1.2V) or EnDat error counters (should be zero)

EnDat error counters incrementing indicate cable issues or encoder failure requiring immediate attention

Inspect encoder cable integrity

Physically inspect spindle encoder cable for damage, especially at cable carriers and spindle housing entry. Check connector seating at both encoder and control ends

Look for oil contamination on encoder - this is common on spindles and degrades signal quality

Test with oscilloscope if available

Measure encoder signals at TNC input with oscilloscope during slow spindle rotation - look for clean sinusoidal waveforms without noise spikes or amplitude variations

Only qualified personnel should probe encoder signals - incorrect probing can damage sensitive encoder inputs

Verify encoder reference mark

Check MP4130.x (spindle encoder reference mark monitoring). If reference mark not detected, positioning cannot establish absolute position reference

Execute spindle homing routine (typically M19 after control startup) and verify 'REF' indicator appears for spindle axis

Review tolerance parameter

MOD → Machine Parameters → filter '1262' to display MP1262 SPIND. POSITIONING TOLERANCE. Check current value in degrees

Typical values: 0.1-0.5 degrees for gear-driven spindles, 0.01-0.1 degrees for direct-drive spindles

Analyze actual positioning accuracy

Execute M19 multiple times in MDI, recording final position from Position Display after each orientation. Calculate variation between attempts

Use STOP M5 between tests to fully decelerate spindle before next M19

Adjust tolerance appropriately

Set MP1262 to 2-3 times the measured positioning variation. For example, if variation is ±0.15°, set MP1262 to 0.3-0.5 degrees

Tighter tolerance isn't always better - it can cause nuisance alarms without functional benefit for tool change operations