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.
Repair Steps
- 1
Confirm the option function settings and operation for the respective option slot.
- 2
Ensure the plug-in option in slot 1, 2, or 3 is connected securely to its connector.
- 3
Check the communication cable associated with the option for wire breakage.
- 4
Verify that the termination resistor for the communication option is fitted properly.
Verified technical data. Last updated: March 2026
Source: Mitsubishi Electric A500 Inverter