5-1
Chapter 5 TROUBLESHOOTING
5.1 Alarm Codes
Table 5.1 Quick List of Alarm Codes
Instantaneous overcurrent
The inverter momentary output current exceeded the
overcurrent level.
OC1: Overcurrent during acceleration
OC2: Overcurrent during deceleration
OC3: Overcurrent during running at a constant speed
Zero-phase current caused by ground fault in the output
circuit has exceeded the allowable limit.
(30kW or above)
The DC link bus voltage exceeded the overvoltage
detection level.
OV1: Overvoltage during acceleration
OV2: Overvoltage during deceleration
OV3: Overvoltage during running at a constant speed
The DC link bus voltage dropped below the undervoltage
detection level.
An input phase loss occurred or the Interphase voltage
unbalance rate was large.
An output phase loss occurred.
The temperature around the heat sink has risen
abnormally.
The external alarm THR was entered.
(when the THR "Enable external alarm trip" has been
assigned to any digital input terminal)
Inverter internal overheat
The temperature inside the inverter has exceeded the
allowable limit.
Motor protection (PTC/NTC thermistor)
The temperature of the motor has risen abnormally.
Charging resistor overheat
The temperature of the charging resistor inside the
inverter has exceeded the allowable limit.
Braking register overheat
The temperature of the Braking resistor has exceeded
the allowable limit.
The electronic thermal protection for motor overload
detection was activated.
The temperature inside the IGBT has risen abnormally.
Braking transistor broken
Detection of an abnormality in the brake transistor
An error has occurred when writing data to the inverter
memory.
Keypad communications error
A communications error has occurred between the
keypad and the inverter.
A CPU error or LSI error has occurred.
Option communications error
A communications error has occurred between the
connected option card and the inverter.
An error was detected by the connected option card (not
by the inverter).
An incorrect operation was attempted.
Auto-tuning or Magnetic Pole Position Offset tuning has
failed, resulting in abnormal tuning results.
RS-485 communications error
(Er8: RS-485 port 1, ErP: port 2)
A communications error has occurred during RS-485
communication.
Data saving error during undervoltage
When the undervoltage protection was activated, the
inverter failed to save data, showing this error.
The LSI on the power printed circuit board has
malfunctioned due to noise, etc.
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