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ErrorLib — Industrial Fault Code Library

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E.OP1 to OP3

Option slot alarm

Mitsubishi Electric · A500 Inverter

What does E.OP1 to OP3 mean?

This alarm stops the inverter output if a functional alarm occurs in the plug-in option loaded in the corresponding slot (1, 2, or 3). Examples include communication alarms for communication options or contact faults for other types of plug-in options.

Common Causes

  • An alarm detected from a specific option slot (e.g., Option 1, 2, or 3).
  • Failure of the hardware in the designated option slot.
  • An option card installed in the slot is faulty or incompatible.
  • Communication error with the option card in the specified slot.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Confirm the option function settings and operation for the respective option slot.

  2. 2

    Ensure the plug-in option in slot 1, 2, or 3 is connected securely to its connector.

  3. 3

    Check the communication cable associated with the option for wire breakage.

  4. 4

    Verify that the termination resistor for the communication option is fitted properly.

Browse all codes in this manual (21)
Verified technical data. Last updated: April 2026

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Source: Mitsubishi Electric A500 Inverter
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