Fagor alarm 4059: ERROR 103: Internal -8 V out of range

What it means

The -8 V internal rail is outside its permitted window, so the drive latches the error until the servo system is rebooted. The CNC stops axes/spindle, drops enables and aborts the program on all channels.

Likely causes

• Internal power supply defect
• Overloaded rail due to a failing analog/measurement circuit
• Internal wiring or connector problem

Replacement parts

We supply the following units for this alarm — tested, warranty-backed:

• DDS / AXD / SPD drive

  drive · Common cause

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