LOW VOLT POWER CIRCUIT

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This Fanuc Series 0i-D/0i Mate-D spindle alarm indicates that an input voltage drop was detected in the power circuit (Power Supply (PS) alarm indication: 4). This typically signifies a momentary power failure or poor contact in the magnetic contactor (MC).

• Input power supply voltage drop or sag affecting the spindle amplifier/PS unit.
• Momentary power failure or interruption of the AC supply.
• Poor contact, wear, or failure in the main magnetic contactor (MC) supplying power.
• Loose or corroded power wiring connections to the spindle amplifier or PS unit.

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1. 1

   Measure the incoming three-phase AC power supply voltage to the spindle amplifier (or PS unit) to confirm it is stable and within specifications.

2. 2

   Inspect the main magnetic contactor (MC) for signs of wear, pitting, or poor contact; check its coil operation and auxiliary contacts.

3. 3

   Check all power wiring connections from the main supply breaker through to the spindle amplifier for looseness or corrosion.

4. 4

   Monitor the power supply for momentary voltage sags or interruptions, especially during machine operation or startup.

5. 5

   If the magnetic contactor shows signs of failure or malfunction, replace it with an equivalent unit.