User Manual of A90 Series Inverter
5
During operation:
Danger
1.
Do not touch the cooling fan, radiator and discharge resistor to feel the temperature;
otherwise, burns may be caused!
2.
Non-professional technicians must not test signals when the controller is in operation;
otherwise, personal injury or equipment damage may be caused!
Warning
1.
Prevent any object from falling into the inverter in operation; otherwise, the inverter
may be damaged!
2.
Do not start or stop the inverter by turning on or off the contactor; otherwise, the
inverter may be damaged!
During maintenance:
Danger
1.
Never carry out repair and maintenance in the live state; otherwise, electric shock may
be caused!
2.
Maintenance of the inverter must be carried out 10 min after the main circuit is
powered off and the display interface of the keyboard is disabled; otherwise, the
residual charge in the capacitor will do harm to the human body!
3.
Personnel without professional training are not allowed to repair and maintain the
inverter; otherwise, personal injury or inverter damage may be caused!
4.
The parameters must be set after the inverter is replaced. Plugs in all interfaces must
be operated in the power-off status!
5.
The synchronous motor generates electricity while rotating. Inverter maintenance and
repair must be performed 10 min after the power supply is turned off and the motor
stops running; otherwise, electric shock may be caused!
Precautions
Motor insulation inspection
When the motor is used for the first time or after long-term storage or subject to regular
inspection, its insulation should be checked to prevent the inverter from damage caused by
failure of the motor winding insulation. During the insulation inspection, the motor must be
disconnected from the inverter. It is recommended to use a 500V megohmmeter. The
measured insulation resistance must not be less than 5 MΩ.
Thermal protection of motor
If the motor used does not match the rated capacity of the inverter, especially when the
rated power of the inverter is greater than that of the motor, the motor must be protected by
adjusting the motor protection parameters of the inverter or installing a thermal relay in
