InverterFR-E800Verification pending — cross-check with the official manual
FR-E800 MT — MT
Alarm — operational, inspection needed
CAUSE
Why does it occur?
- Appears when the inverter's cumulative energization time reaches or exceeds the parameter set value
- Set the time until "MT" is displayed using Pr.504 Maintenance timer warning output set time (MT). "MT" does not appear when the setting of Pr.504 is the initial value ("9999")
- The set time of maintenance timer has been exceeded
REMEDY · Step by step
How to fix it?
- Take appropriate countermeasures according to the purpose of the maintenance timer setting
- Setting "0" in Pr.503 Maintenance timer clears the indication
- Reference manual FR-E800 Instruction Manual (Function)
Do not reset repeatedly before identifying the cause. Repeated resets while ignoring a trip/alarm can cause secondary damage (IGBT failure, motor winding damage, etc.).
SOURCE
Related manual page
Summary based on the official Mitsubishi Electric manual. For accurate and complete information, always consult the official manual.
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