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7.Trouble Shooting
Fault
Code
EM9 User's Manual
Fault Type
Reason
Inverter overload
1. Acc time is too short
2. Restart the rotating motor.
3. Input voltage is too low
4. Load is too heavy
Input phase
failure
Phase loss of R,S,T input
Output phase
failure
Rectify overheat
IGBT overheat
External fault
Communication
fault
1.Phase loss of U,V,W output (or a
serious unbalance in 3phase input)
2. connection loose
1. Instant over current of inverter.
2. Short-circuit or ground fault
occurred at inverter output.
3. Obstruction of ventilation channel
or Cooling fans of inverter stops or
damaged.
4. Ambient temperature is too high.
5. Control board wire or plug-ins loss.
6. Auxiliary power damaged or under
voltage of driver voltage.
7. Power module bridge short
8. control board abnormal
1. SI External fault input terminal take
effect.
1. Improper baud rate setting.
2. Receive wrong data.
3. Communication is interrupted for
long time.
1. Wires or connectors of control
boards are loose.
Current detection
2. Auxiliary power damaged
fault
3. Hall sensor is damaged.
4. Amplifying circuit is abnormal.
1.Capacity of motor is not meet that of
inverter
2. Improper setting of motor rated
parameters.
Motor auto tuning
3.The motor parameter auto-tuning
fault
are warped with the standard
parameter
4. Overtime of auto-tuning.
64
Solution
1. Decrease acceleration.
2. Avoid restart after power off.
3. Check the power supply
4. Select bigger capacity inverter.
1. Check power supply.
2. Check the wiring installation.
1. Check the wiring installation of
output.
2. Check the motor and wiring.
1. Refer to over current solution.
2. Check the wiring and install again.
3. Clear the ventilation Channel or
Replace cooling fan.
4. Reduce Ambient temperature.
5. Check the wiring and
Installation.
6. Ask for support.
7. Ask for support.
8. Ask for support.
1. Inspect input of external
equipment.
1. Set proper baud rate.
2. Press STOP/RESET to reset. Ask
for support.
3. Check wiring of communication
interface.
1. Check the signal linker and insert
it again.
2. Ask for support.
3. Ask for support.
4. Ask for support.
1. Change the model of inverter.
2. Set rated parameters according to
motor nameplate.
3. Run the motor without load and do
auto-tuning again.
4.Check motor's wiring and