1500

AC DOWN

Mitsubishi Electric · MELSEC System Q/L Series

What does 1500 mean?

A momentary power supply interruption has occurred. This indicates a brief loss or sag in the incoming AC power supply, which can affect the stability and operation of the CPU.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the power supply.

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Verified technical data. Last updated: March 2026

Related Faults

1010END Instruction Not Executed1000CPU Down Error1101RAM Error - Sequence Program Memory
Source: Mitsubishi Electric MELSEC System Q/L Series
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