EM12 User’s Manual
7. Fault Diagnosis and Solution
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7. Fault Diagnosis and Solution
7.1 Fault Alarm and Countermeasures
EM12 inverter has 35 types of warning information and protection function. In case of abnormal fault, the
protection function will be invoked, the inverter will stop output, and the faulty relay contact of the inverter will
start, and the fault code will be displayed on the display panel of the inverter. Before consulting the service
department, the user can perform self-check according to the prompts of this chapter, analyze the fault cause and
find out t solution. If the fault is caused by the reasons as described in the dotted frame, please consult the agents
of inverter or our company directly. Among the 35 types of warning information, Err22 is hardware over current
or over voltage signal. In most cases, the hardware over voltage fault will cause Err22 alarm.
Table 7-1 Common faults and solution of the frequency inverter
Fault Type
Display
Possible Causes
Solutions
Inverter unit
protection
Err01
1: The output circuit is grounded or short
circuited.
2: The connecting cable of the motor is
too long.
3: The IGBT overheat.
4: The internal connections become loose.
5: The main control board is faulty.
6: The drive board is faulty.
7: The inverter IGBT is faulty.
1: Eliminate external faults.
2: Install a reactor or an output filter.
3: Check the air filter and the cooling fan.
4: Connect all cables properly.
5: Ask for technical support
6: Ask for technical support
7: Ask for technical support
Over current
during
acceleration
Err02
1: The output circuit is grounded or short
circuited.
2: Motor auto-tuning is not performed.
3: The acceleration time is too short.
4: Manual torque boost or V/F curve is
not appropriate.
5: The voltage is too low.
6: The startup operation is performed on
the rotating motor.
7: A sudden load is added during
acceleration.
8: The frequency inverter model is of too
small power class.
1: Eliminate external faults.
2: Perform the motor auto- tuning.
3: Increase the acceleration time.
4: Adjust the manual torque boost or V/F
curve.
5: Adjust the voltage to normal range.
6: Select rotational speed tracking restart
or start the motor after it stops.
7: Remove the added load.
8: Select a frequency inverter of higher
power class.
Over current
during
deceleration
Err03
1: The output circuit is grounded or short
circuited.
2: Motor auto-tuning is not performed.
3: The deceleration time is too short.
4: The voltage is too low.
5: A sudden load is added during
deceleration.
6: The braking unit and braking resistor
are not installed.
1: Eliminate external faults.
2: Perform the motor auto-tuning.
3: Increase the deceleration time.
4: Adjust the voltage to normal range.
5: Remove the added load.
6: Install the braking unit and braking
resistor.
Summary of Contents for EM12 Series
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