EM15-SP User Manual
6. Fault Diagnosis and solution
29
6. Fault Diagnosis and Solution
6.1 Fault Alarm and Countermeasures
EM15-SP
VFD
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
variable frequency drive
Fault Code
Err01
Fault Type
Inverter unit protection
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
Fault Code
Err02/Err04
Fault Type
Over current during acceleration/ at constant speed
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
variable frequency drive
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
variable frequency drive
of higher power
class.
Fault Code
Err03
Fault Type
Over current during deceleration
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.
Fault Code
Err05/ Err06
Fault Type
Overvoltage during acceleration/deceleration
1: The input voltage is too high.
2: An external force drives the motor during
acceleration.
3: The acceleration/deceleration time is too short.
4: The braking unit and braking resistor are not
installed.
1: Adjust the voltage to normal range.
2: Cancel the external force or install a braking resistor.
3: Increase the acceleration/deceleration time.
4: Install the braking unit and braking resistor.
Fault Code
Err07
Fault Type
Overvoltage at constant speed
1: The input voltage is too high.
2: An external force drives the motor during
deceleration.
1: Adjust the voltage to normal range.
2: Cancel the external force or install the braking
resistor.
Fault Code
Err08
Fault Type
Control power supply fault
The input voltage is not within the allowable range.
Adjust the input voltage to the allowable range.