NO.7 Maintenance and Fault Information
79
(5) The inverter is in fault protection condition.
(6) Fault of motor or inverter.
2. Parameter setting failure
(1) Password is locked; conduct setting after decoding.
(2) The inverter is operating.
(3) Abnormal connection of connector assemblies and abnormal communication of digital
actuator; remove the actuator and reinstall after cutting off power supply.
3. Motor fails to reversely rotate
Reverse is prohibited.
4. Motor rotates in opposite direction
Motor output connecting line is wrong, it is only necessary to exchange any two connecting
lines among U, V and W.
5. Motor decelerates too slowly
(1) Too long deceleration time set, reduce deceleration time.
(2) Install brake resistor.
(3) Install DC brake.
6. Motor overheating
(1) The load is too large and actual torque has exceeds rated torque of the motor, so it is
proposed to increase the capacity of motor.
(2) Ambient temperature is overhigh; the motor may be burn out in the environment with high
temperature, so it is necessary to reduce ambient temperature of the motor.
(3) Interphase withstand voltage of the motor is insufficient, on/off action of the inverter shall
produce
impulse wave among winding coils of the motor; generally the maximum impulse
voltage shall be 3 times input power of the inverter, and the motor with interphase impulse
withstand voltage higher than the maximum impulse voltage shall be used.
7. Starting of inverter interferes in other control devices
(1) Reduce carrier frequency and the times of internal on/off action.
(2) Set up noise filter respectively on power input side and output side of the inverter.
(3) Please properly earth the inverter and motor.
(4) Encase the cable with metal tube for shielding.
(5) Separately route main circuit wiring and control line.
8. Overcurrent stall of inverter is detected during starting of fan
(1) When the start is performed, the fan is in idling condition, so DC braking during starting is
required to be set.
