Code Description
OC1 Overcurrent during acceleration
The inverter momentary output current exceeded the
overcurrent level.
OC2 Overcurrent during deceleration
OC3
Overcurrent during running at a
constant speed
EF Ground fault
Zero-phase current caused by ground fault in the output
circuit has exceeded the allowable limit.
(30kW or above)
OV1 Overvoltage during acceleration
The DC link bus voltage exceeded the overvoltage detection
level.
OV2 Overvoltage during deceleration
OV3
Overvoltage during running at a
constant speed
LV Undervoltage
The DC link bus voltage dropped below the undervolt detection level.
age
Lin * Input phase loss
An input phase loss occurred or the Interphase voltage
unbalance rate was large.
OH1 Heat sink overheat The temperature around the heat sink has risen abnormally.
OH2 External alarm
The external alarm THR was entered.
(when the THR "Enable external alarm trip" has been
assigned to any digital input terminal)
OH3 Inverter internal overheat
The temperature inside the inverter has exceeded the
allowable limit.
OH4
Motor protection (PTC/NTC
thermistor)
The temperature of the motor has risen abnormally.
DBH Braking register overheat The temperature of the Braking resistor has exceede allowable limit.
OL1 Overload of motor 1
The electronic thermal protection for motor overload detection
was activated.
OLU Inverter overload The temperature inside the IGBT has risen abnormally.
OS Over speed prevention The motor speed is higher than maximum speed * L32.
PG Broken wiring in the PG The motor speed is higher than maximum speed * L32.
nrb NTC wire break error Detected a wire break in the NTC thermistor detection circuit.
Er1 Memory error
An error has occurred when writing data to the inverter
memory.
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