Fanuc · AC Spindle Motor Alpha i-Beta i Series Parameters
The main circuit of the spindle amplifier is overloaded, or the IPM (Intelligent Power Module) has overheated. This indicates excessive current draw or insufficient cooling for the power module.
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Measure motor winding resistance (U, V, W) to ground and between phases.
Check the heatsink temperature of the IPM module on the amplifier.
Verify that parameter P1-01 (motor current rating) is set correctly.
Inspect the motor power cables for insulation damage.
Run a low-speed motor test to assess current draw.