User’s Guide for EM760 series high-performance vector inverter 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 minutes 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. After replacement of the inverter, it is required to set and check the parameters.
Plugging and unplugging operations must be done with power disconnected! 5. The synchronous motor can rotate to generate electricity. For maintenance and repair of the inverter, it is required to wait 10 minutes after the motor stops rotation and have safety measures in place before disconnecting the motor and the inverter; otherwise, electric shock may occur! During operation: 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! Danger 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! 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 5MΩ.
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 front of the motor. Operation above power frequency Some inverters can provide 0.00Hz~600.00Hz/0.0Hz~3000.0Hz output frequency. When the motor needs to operate above the rated frequency, please consider the capacity of the mechanical device. Otherwise, equipment damage or even life-threatening accidents may occur.
Presence of voltage-dependent device or capacitor increasing the power factor on output side The inverter outputs PWM waves. If there is a capacitor increasing the power factor or voltage-dependent resistor for lightning protection on the output side, the inverter may be subjected to instantaneous overcurrent and even damage. Do not use these devices. Use beyond rated voltage The inverter should not be used beyond the allowable working voltage range specified in this manual; otherwise, components inside the inverter are prone to damage. If necessary, use the appropriate step-up or step-down device for voltage transformation.
Lightning impulse protection This inverter series is equipped with a surge current protection device for protection against induced lightning. In lightning-prone places, a lightning protection device should be added before the inverter. Altitude and derating In areas with an altitude of more than 1,000m, where heat dissipation of the inverter is poor due to thin air, derating is required (derating by 1% per 100m altitude increase to maximum 3,000m; for ambient temperature 5