231-8910

Check counterweight system

Inspect mechanical counterweight or pneumatic/hydraulic balancing system for proper operation and adjustment.

Ensure axis is mechanically secured before inspection

Verify MP1020 velocity limit

Access MOD > Machine Parameters > Axis-specific parameters and check MP1020 (maximum velocity) is appropriate for axis configuration.

Reduce MP1020 temporarily to 50% of current value for testing

Adjust counterweight tension

Calibrate counterweight system so axis remains stationary when drive is disabled, following machine manufacturer specifications.

Use proper lifting equipment and follow lockout procedures

Test rotor position measurement

Perform controlled power-on sequence and monitor axis behavior during initial rotor position detection phase.

Check current rotor position

Access MANUAL > Position display to verify mechanical axis position before power cycle.

Note position values before shutdown for comparison

Manually position axis to favorable location

With drives disabled, manually move axis to mid-travel position away from mechanical limits and load concentrations.

Ensure all safety systems are active during manual positioning

Verify MP1025 and MP1026 settings

Check acceleration parameters MP1025 (maximum acceleration) and MP1026 (jerk limitation) are not set too aggressively for startup conditions.

Perform controlled startup sequence

Execute power-on with reduced feed override and monitor rotor position measurement completion without alarm.

Check encoder cable connections

Inspect encoder cable connections at motor and TNC control for proper seating and cable integrity.

Look for oil contamination or mechanical damage on encoder cables

Verify encoder supply voltage

Measure encoder supply voltage at motor connection, should be 5V ±0.25V for standard Heidenhain encoders.

Use proper ESD precautions when working with encoder electronics

Check encoder signal quality

Access MANUAL > Diagnosis > Encoder signals to verify clean sinusoidal signals without noise or dropouts.

Test with encoder simulation

Temporarily enable encoder simulation mode to isolate feedback system as root cause of velocity measurement errors.

Access rotor position parameters

Navigate to MOD > Machine Parameters > Spindle/Axis specific and locate MP1030 series parameters for rotor position measurement.

Verify MP1031 measurement velocity

Check MP1031 (rotor position measurement velocity) is set appropriately low, typically 10-20% of MP1020 maximum velocity.

Start with conservative 10% value and increase gradually if needed

Adjust MP1032 timeout parameters

Verify MP1032 (rotor position measurement timeout) allows sufficient time for measurement completion without rushing the process.

Reset and test measurement sequence

Clear alarm, cycle power, and observe rotor position measurement with new parameter settings.