7. Troubleshooting
Alarm code Alarm name Alarm description
OC1 Overcurrent protection
during acceleration
OC2 Overcurrent protection
during deceleration
OC3 Overcurrent protection
at constant speed
Excessive output current due to:
- Excessive motor load.
- Acceleration (deceleration) too fast.
- Short circuit in the output circuit.
- Ground fault (this protection is effective only during start
up).
OU1 Overvoltage protection
during acceleration
OU2 Overvoltage protection
during deceleration
OU3 Overvoltage protection
at constant speed
Voltage in the DC link too high (400 V for 200 V class inverters;
800 V for 400 V class inverters) due to:
- Deceleration too fast.
- The motor is regenerating energy and there is no braking
resistor connected to the inverter.
This protection may not protect the case where the supply voltage
is excessive
LU Undervoltage
protection
Voltage in the DC link too low (200 V for 200 V class inverters; 400
V for 400 V class inverters).
In the case F14=4 or 5, then this alarm does not go off when the
voltage in the DC link is low.
Lin Input phase loss
protection
Input phase loss.
If the inverter load is low or a DC reactor is installed the event of an
input phase loss may be not detected.
OPL Output phase lost
protection
An output phase of the inverter is in open circuit.
OH1 Overheat protection Excessive heat sink temperature due to:
- Inverter fan is not working.
- The inverter is overloaded.
dbH External braking
resistor overheat
Overheating of the external braking resistor
OLU Overload protection IGBT internal temperature calculated from the output current and
from the temperature inside the inverter is over the preset value.
OH2 External alarm input A digital input is programmed with the function THR (9) and has
been deactivated.
OL1 Electronic thermal
overload motor 1
OL2 Electronic thermal
overload motor 2
The inverter is protecting the motor in accordance with the
electronic thermal overload protection setting:
- F10 (A06) =1 is for general purpose motors.
- F10 (A06)=2 is for inverter motors.
- F11 (A07) defines the operation level (current level).
- F12 (A08) defines the thermal time constant.
F functions are for motor 1 and A functions are for motor 2.
OH4 PTC thermistor The thermistor input has stopped the inverter to protect the motor.
The thermistor has to be connected between terminals [C1] and
[11]. Also the slide switch has to be set to the correct position and
functions H26 (enable) and H27 (level) have to be set.
Er1 Memory error
detection
Memory error has been detected during power up.
Er2 Keypad
communications error
detection
The inverter has detected a communications error with the keypad
(standard keypad or multifunction keypad).
Er3 CPU error detection Inverter has detected a CPU error or LSI error caused by noise or
some other factors.
Er4 Option
communications error
detection
Inverter has detected a communications error with the option card.
Er5 Option error detection The option card has detected an error.
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