InverterFR-E800Verification pending — cross-check with the official manual
FR-E800 E.OS — Overspeed occurrence
Trip — immediate stop
CAUSE
Why does it occur?
- The inverter output is shut off when the motor speed exceeds the Pr.374 Overspeed detection level under encoder feedback control, Real sensorless vector control, Vector control, and PM sensorless vector control
- When Pr.374 = "9999 (initial value)", the inverter output is shut off when the motor speed exceeds the "maximum frequency + 20 Hz" for the induction motor (up to 420 Hz under Vector contro
REMEDY · Step by step
How to fix it?
- • Set Pr.374 correctly. • Set Pr.369 correctly. (Under encoder feedback control or Vector control) • When the motor temperature increases, enable the online auto tuning at startup (set Pr.95 (Pr.5
- = "1") (under Real sensorless vector control). 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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