SV0466 Motor/Amplifier Combination fault in Fanuc drive

SV0466 Motor/Amplifier Combination fault in Fanuc drive

Description

SV0466 indicates a configuration mismatch between the Servo Amplifier module (SVM) and the motor connected to it. Fanuc drives are not universal; a 20A drive cannot run a 100A motor, and interestingly, a large drive sometimes cannot run a tiny motor accurately due to current sensing resolution. The CNC checks the "Motor ID" set in the parameters against the "Amplifier ID" it reads from the drive hardware. If they are incompatible according to Fanuc's internal lookup table, SV0466 is displayed.

Cause

This usually occurs after maintenance or parts swapping.

• Wrong Part Number: You replaced a blown amplifier (e.g., A06B-6117-H104) with a similar but different one (e.g., A06B-6117-H105). Even if they look identical, the power rating differs.
• Parameter Error: The parameters were reloaded, but the wrong motor code was entered for that axis.
• FSSB Assignment: In a multi-axis drive (e.g., SVM2-40/40), you might have plugged the large motor into the "M" (Medium) axis port and the small motor into the "L" (Large) axis port.

Solution

You must align the hardware and software.

1. Verify Hardware: Check the yellow label on the side of the drive. Compare it strictly with the machine's electrical parts list.
2. Check Parameter 2020: Verify the Motor ID. If you installed a larger motor upgrade, you must update this parameter.
3. Check Parameter 2165: This parameter sometimes allows you to override the standard current limit, though this is dangerous.
4. FSSB Setting: If using a multi-axis amp, ensure the optical cable and axis assignment in the FSSB screen match the physical location of the motor plugs.