231-4260

Check axis movement manually

In Manual mode, move the affected axis at low feedrate (F100) and observe current display in machine parameter MP7300 (actual current).

Ensure machine is properly homed and workpiece/tooling is clear before manual movement.

Inspect mechanical components

Check ballscrew backlash, linear guide condition, and lubrication. Verify MP1020 (ballscrew pitch) matches actual hardware.

Listen for unusual noise during movement - grinding indicates mechanical binding.

Verify cutting parameters

Reduce feedrate and spindle speed in active program. Check if alarm clears with lighter cutting loads.

Monitor MP7300 current values - should not exceed 80% of MP1110 (maximum motor current) during normal operation.

Verify motor nameplate data

Access Machine Parameters menu and compare MP1110, MP1120, MP1130 with actual motor nameplate specifications.

Record original parameter values before making changes.

Check encoder parameters

Verify MP4110 (encoder type) and MP4120 (encoder resolution) match installed encoder specifications.

Mismatched encoder parameters can cause position errors leading to excessive current draw.

Validate servo loop settings

Check MP1410 (position loop gain) and MP1420 (velocity loop gain) are within manufacturer specifications for the motor type.

Excessive loop gains can cause oscillation and high current consumption.

Check amplifier status LEDs

Observe servo amplifier front panel LEDs for error indications. Red LED indicates amplifier fault condition.

Power down system before inspecting amplifier connections.

Monitor actual vs commanded current

Use TNC diagnostic screen to compare MP7300 (actual current) with MP7310 (commanded current) during movement.

Large discrepancy between commanded and actual current indicates amplifier output stage problems.

Check amplifier connections

Verify motor power cables, encoder feedback cables, and amplifier ground connections are secure and undamaged.

Loose power connections can cause current spikes and false I²t triggering.

Check motor temperature

Monitor MP7400 (motor temperature) if thermal sensor is installed. Normal operating temperature should be below 80°C.

Allow motor to cool before handling - surface temperatures may exceed 100°C.

Inspect cooling system

Verify motor cooling fan operation and clean any debris from motor cooling fins or cabinet ventilation.

Check cabinet temperature - ambient above 40°C significantly reduces motor thermal capacity.

Adjust I²t parameters if necessary

If motor cooling is adequate, verify MP1130 (I²t time constant) matches motor specifications. Increase cautiously if confirmed correct.

Increasing I²t parameters without proper motor cooling can cause permanent motor damage.