Mitsubishi FREQROL-2120 Error Codes

16 codes from pages 32–61 of the manual

This is the list of alarm codes the Mitsubishi manual gives for the FREQROL-2120 inverter. Find your code below and open it for what the manual says about its causes and what to do.

Alarm codes from p. 32

CodeWhat it meansPage
OC2 Steady speed overcurrent p. 32
OC3 Deceleration overcurrent p. 32
THM: Motor thermal relay p. 32
THT: Inverter thermal relay p. 32
OLT: Stall prevention p. 32
EOC1 Inverter output current exceeded the overcurrent limit during acceleration. p. 61
EOC2 Inverter output current exceeded the overcurrent limit during constant-speed operation. p. 61
EOC3 Inverter output current exceeded the overcurrent limit during deceleration. p. 61
EOVT Braking regenerative power from motor exceeded the regenerative overvoltage limit. p. 61
ETHM Electronic thermal relay in the inverter was activated (current is below 150% of preset current). p. 61
ETHT Electronic thermal relay in the inverter was activated (current is over 150% of preset current). p. 61
EIPF Instantaneous power failure protective function was activated p. 61
EFIN Cooling fan failed to rotate p. 61
EBE Brake transistor fault detection p. 61
EOLT Stall preventive function was activated during constant-speed operation and stopped the motor. p. 61
EPE Memory in the inverter is corrupted p. 61

Codes and descriptions are taken from the manufacturer’s manual; page numbers link to the PDF. ManualLib is not affiliated with Mitsubishi. Found a mistake? Report an error.