Chapter 6 Fault diagnosis and
solutions
ICON500 high performance vector control frequency inverter user
manual
- 92
-
Fault Name
Display
Possible Causes
Solutions
Contactor open
Er.LU2
1. Instantaneous power cut
2, the inverter input voltage is not in the
scope of the specification requirements
3. Abnormal bus voltage
4,rectifier bridgeand buffer resistance is
not normal
5, drive board is fault
6. control board is fault
1. Reset failure
2. Adjust the voltage to the normal
range
3. Ask for technical support
4. Ask for technical support
5. Ask for technical support
6.Ask for technical support
Frequency
inverter
overload
Er. oL
1: The load is too heavy or locked-
rotor occurs on the motor.
2: The frequency inverter model is of
too small power class.
1: Reduce the load andcheck
the
motor and mechanical condition.
2: Select afrequency
Inverter of higher power level.
Motor
overload
Er.oL1
1: Motor protections parameter set
improperly.
2: The load is too heavy or motor
blocked
3: Motor power smaller
1: Set Parameter correctly.
2: Reduce the load and check the
Motor and the mechanical
condition.
3: Select a motor of higher power
level
Motor
overheat
Er. oH3
1: The cabling of the temperature
sensor becomes loose.
2: The motor temperature is too high
1: Check the temperature sensor
cabling and eliminate the cabling
fault.
2: Lower the carrier frequency or
adopt other heat radiation
Power input
phase loss
Er.iLP
1: The three-phase power input is
abnormal.
2: The drive board is faulty.
3: The lightning proof board is faulty.
4: The main control board is faulty.
1:Eliminate external faults.
2: Ask for technical support.
3: Ask for technical support.
4: Ask for technical support.
Power output
phase loss
Er.oLP
1: The cable connecting the frequency
inverter and the motor is faulty.
2: The frequency inverter's
three-phase outputs are unbalanced
when the motor is running.
3: The drive board is faulty.
4: The IGBT module is faulty.
1:Eliminate external faults.
2: Check whether the
Motor three phase winding
is normal.
3: Ask for technical support.
4: Ask for technical support.
IGBT Module
overheat
Er. oH
1: The ambient temperature is too
high.
2: The air filter is blocked.
3: The fan is damaged.
4: The thermally sensitive resistor of
the IGBT module is damaged.
5: The inverter IGBT module is
damaged
1:Lower the ambient temperature.
2: Clean theairfilter.
3: Replace thedamaged fan.
4: Replace the damaged thermally
sensitive resistor.
5: Replace the inverter module.