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ErrorLib — Industrial Fault Code Library

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PW0009

CPU SELF TEST ERROR(PMC)

Fanuc · Alpha i Series Servo Amplifier

What does PW0009 mean?

The PMC detected an error in its CPU self-test function and RAM check function. This indicates a critical hardware fault within the PMC unit, necessitating a power cycle to attempt to clear the alarm.

Common Causes

  • PMC CPU internal memory (RAM) corruption.
  • PMC CPU hardware component failure.
  • Unstable power supply to the PMC.
  • Firmware corruption in the PMC.
  • Excessive heat affecting PMC operation.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Cycle power to the PMC module.

  2. 2

    Inspect the PMC for any physical damage or signs of overheating.

  3. 3

    Re-flash the PMC firmware using appropriate tools.

  4. 4

    Verify the voltage supply (e.g., 5VDC) to the PMC.

  5. 5

    If the issue continues, replace the PMC module.

Browse all codes in this manual (101)
Verified technical data. Last updated: April 2026

Related Faults

0233Velocity Pulse Count Exceeded0243Position Pulse Count Exceeded0434Velocity Loop Integral Gain Overflow
Source: Fanuc Alpha i Series Servo Amplifier
Open Manual (Page 125)Search more codes in this manual