User Manual of EM760 High-Performance Inverter Instructions on peripheral electrical elements 40 Item Description Circuit breaker or leakage protection switch To be installed between power supply and inverter input side. Circuit breaker or leakage protection switch: Cuts off power supply upon overcurrent in downstream devices and thus prevents accidents. Contactor Connects/disconnects the inverter. Frequently powering on/off or directly starting an inverter with the contactor frequency should be avoided. AC input reactor Increases power factor of input side. Effectively eliminates high-order harmonics on the input side to prevent damage to other devices arising from voltage wave distortion.
Eliminates input current imbalance arising from imbalance between power supply phases. Input-side noise filter Reduces outward conduction and radiated interference of the inverter and conduction interference from power supply to the inverter, and increases the resistance against interference of the inverter. Output-side noise filter Connect a noise filter on the output side of the inverter to reduce inductive interference and radio interference. AC output reactor Generally, the output side ofthe inverter involves many high-order harmonics.
Ifthe motor is separated faraway from the inverter, due to the great distributed capacitance in the circuit, a certain harmonic might give rise to resonance in the loop, resulting in two problems: 1. Damaging insulation performance ofthe motor, or even the motor perse ifthe issue persists. 2. Producing considerable leakage current and causing frequent protection in the inverter. Installation of output reactor can give protection to motor insulation and reduce bearing current. Motor Please select the matched motor as per the recommendations. Braking unit For products whose model name doesn't contain the letter B, please select our braking unit (BR100) and the recommended braking resistors.
The motor consumes regenerated energy through the braking resistors during deceleration. Braking resistor For products whose model name contains the letter B, please select braking resistors optionally. The motor consumes regenerated energy through the braking resistors during deceleration. Note: For selection of electrical peripherals, please refer to “3.2.4 Input side wiring of main circuit” and “3.2.5 Output side wiring of main circuit”.